Listening to you talk is like hearing the essence of all physics classes I've ever had through school, and later. It's just so relaxing not having to question what you say, and just nodd in acceptance every time you make a statement. So true.
As a designer and builder of commercial drones I was very impressed, as always, with you presentation. Considering your in depth analysis with everything you do I was a little let down right at the end when you opted for closed DJI flight control system. Are you aware of the Ardupilot project, currently being used by such big names as NASA and Boeing? This is a fully featured open source autopilot source involving software, firmware and hardware. Everything you do you are making open source with your detailed content which enhances us all. I just thought this would place your flight controller, the most critical component in any multi rotor, and the only thing that makes them controllable in the air, as open source as everything else you are doing. For your consideration. Keep up the great content.
This is one of my favorite videos thus far. All of the information and thorough explanations captivate me! Reading through the comment section is also a breath of fresh air. It's great to see people inspired with science and engineering.
Really like your channel, it's rich in technical nomenclature. Like the way your explanations go beyond just the objects themselves and into the material and technical sciences that make up their design. One day, please do a video on your aircraft construction experience regarding carbon fiber. Sounds fascinating. What do you think of weight reductions schemes such as using aluminum wiring and fasteners, Copper wire and steel bolts are so passe' Hollow shank 7075/ 2024 bolts would be the cats ass for these ships. Every oz carried aloft costs billions of electrons.
Thanks! The balance we are striving for is useful information without extrapolating from dogma. If the viewer comes away thinking "now I get it, it's not really complicated and I bet I could do something even better if I just tried..." Perfect. Your suggestion about the bolts is excellent. Explain the engineering principal of mechanical modulus, find an elegant way to drill out existing aluminum hardware, test the practical balance of strength vs lightness and that would be the kind of video we would do.
I found this yesterday after my dad sent me a link and for once there’s a TH-cam that shows everything we want to see and explains it in such a good way Loving your videos so much
Having studied some of these concepts in school, I have to say you have an amazing knack for technical communication. Much better than some of my professors. Great video.
In my growing years there was on TV most Saturdays / Sundays a science show. It was I remember (Mr. Wizard) you pick up where he left off. Getting some of we older folks to think of what is out in the world. Thank you, Alan
I can't even imagine how you can have so much passion, patience, knowledge and determination to implement such complex projects from A to Z. All your videos are amazing
draganfly is undoubtedly the best drone company! It is providing support in ukraine by supplying ukrainian people with medicines, insulin and much more. with this it is increasing its visibility and brand awareness. has an experienced team and unique technology, currently very underestimated based on its potential!
Wow. 20mins, I don't think I even blinked once. Fascinating stuff. You are a wealth of information and experience. Who are you? Do you have any other ways I can follow your projects?
I love your videos - I am a retired aero engineer with lot's of aircraft and drone experience. I wish I had the ability to explain things the way you do. Your explanations of things do require some engineering and mechanical skills on the part of the listener which cannot be avoided without making it TOO simplified. When I watch your presentations I can follow the technical flow of what you are telling me usually on the first pass no matter how complicated the subject. Keep up the great videos....
You are just about the best science teacher I have ever seen, and I had 24 years of education before I was through, although I ended up with degrees in "political science" (which isn't a science at all) and law. Please tell me that you don't merely make TH-cam Videos. You do teach at some college, right? You have a talent that, unfortunately, is far too rare in my profession as a lawyer, which is that you explain complex concepts in plain English without wasting a lot of time or words.
That message is angling the rotors slightly off of vertical also prevents a condition during rapid descent known as Vortex ring State. This is a dangerous condition which can cause the aircraft crash.
IMHO: Your FANTASTIC VIDEOS ARE AWESOME, INFORMATIVE, and BETTER THAN ANYONE ELSE'S!!!! WOW!!!!! VERY INTERESTING, and INFORMATIVE!!!! YOU'RE LIVING THE DREAM!!!
Ok. I stumbled across your channel somehow... but now I'm hooked. Love your deep knowledge of all the engineering details. It's like you were born with an erector set in your hands and just kept building and creating for the rest of your life! ;-) Great Work!
Why are these types of videos not the most popular on You tube. I love watching your videos. I learn a lot. Learning and passing on what we learn has to be one of the most important aspects of human life. Thank you. What did you do for a career?
I'm just starting the drone/propeller videos. Did you happen to see Mark Rober's drone video from 3/18/23? The drones in this video have a unique, asymmetric prop design to reduce noise substantially. He explains it about 15.5 minutes into the video. I'm looking forward to watching the rest of your drone video series!
Really good video! There are two points that occur to me (and you may have looked at and discounted them) 1. Carbon conducts electricity! Why not use it as a return path for your motors / batteries reducing the wiring needed! 2. The propellers you have seem to be almost uniform in depth of materiel. This would simply have the effect of pushing the air in one direction. If you look at the cross section of any lifting body (plane propeller, wing, windfarm blade etc) you see there is a more complex form where the lift is generated by the paths of air above and below having different lengths causing a partial vacuum being formed at certain speeds! This lift is actually greater than the force of the air being pushed downwards! As I have said they may have already been discounted for good reason!
Carbon is conductive, but not very much. That means it is very efficient at turning electricity into heat. The energy lost would almost certainly be more than the weight savings of some wire.
About the manufacture of composite parts...The industrial process of manufacturing light epoxy resin parts is usally done with PrePreg (i.e. rovings or mats of fibre preimpregnated with epoxy resin). It can be kept cooled (under -18°C) for up to two years, or at room temperature for a few days, before it cures. To assemble a part, you stack the layers over a mandrel or inside a mold, depending on required dimension, and then reduce the amount of resin and cure it. This happens,as you mentioned, in an autoclave where heat and vacuum can be applied onto the part. As the resin cures under heat, it liquifies and the unneccesary resin is sucked from the part. That resin is catched up by layers of fabric wrapped around it,over a permeable teflon mat you just can peel off later. Not really feasible for a single build,but if you need a custom shape and more than once, maybe it can be useful to be able to do it. Also, on the point of carbon fibre failing under load - I know that when you would manufacture a custom part that you expect to experience a lot of stress, you would incorporate a layer of kevlar, which prevents the whole structure from failing just because individual strands of carbon broke.
You're point about kevlar is true. Sometimes it is misunderstood that blending the kevlar and the carbon produce a superior composite other than Kevlar's ability to stabilize fragments.
Request: please add web links to the products that you pick or web sites that you find useful. Some people put this in the description but I gather that that has problems and so other sites put the information in a comment and then "pin" the comment so it stays on top. I just discovered this channel a week or so ago and I'm poking around going through the various topics. Excellent work. I hope you are still making videos.
I am really curious what this guy was doing before he started making educational youtube videos / he sounds like a physics professor crossed with a gifted mechanic & machinist with a spirited teacher talent & gifting & very articulate & intelligent! I would be honored to meet him in first person!
Great video and you are my idol :-) there is however one thing I disagree with in your design. I would not charge the batteries on board. About a year ago, I had a battery fire for no apparent reason. There was no damage to the area around the battery since I had it in a fireproof bag, but with your design if you were to have a fire, it would take out part of your creation. Other than that I love everything about your drone. You just got another subscriber.
In the oversized bolt discussion at 11:00, you might consider on future projects to bond an aluminum cylinder through the hollow spar for the bolt to ride in. I think this would be stronger enough that you could use a smaller bolt to achieve the same weight as before, but much stronger than the current arrangement. Excellent videos, good details as to the choices made. I learn something new every time...
Thanks! You're suggestion might be a little lighter, but it probably won't be stronger. The spar can't accommodate a larger diameter aluminum tube, bolt etc.
LEARNED ALOT! and i have basically given up on trying to build a quad-copter! i was going to use 12 double same motors as your but if that fails with double props its pointless. unless again you can build a bigger motor! but again their is the cost of the prop!
This is a compliment, I think you can make an autoclave // or buy a used one to fix & upgrade it // given that you can design & make controllers & are familiar with vacuum pumps & vacuum bagging / & metal fab / you could probably make a propane heated, nitrogen purged, steel tube with hydraulic door & oilless compressor // DIY orbital welding & DIY NDT camera for testing analysis for safety to make sure its welded without defects so it does not turn into a pipe bomb when operating // You can buy the larger steel ring sections prefab & have then sent on a flatbed/ Premake the foundation & then mount it & finish it, then cover with a shed or steel building /// the heat from the autoclave will warm the building // then you can DIY some dope custom carbon fiber stuff //
Project and rock solid engineering. Having saif that I wanted to chime in with a few comments, they're worth what you paid for them: 1) Why take the efficiency loss from the dihedral if you have an actively stabilized aircraft? 2) If you're willing to have multiple battery packs, as apparently you are, you can save a lot of losses by moving the packs near the motors. The bulk of the energy is flowing to the motors so you don't need to have the weight and losses of all thatheavy copper wire plus the frame structure can be built lighter because the arms don't have to support the weight of the batteries in flight at the shoulders. If you want you can have small gauge wires coming into the center to keep all the packs at the same voltage to compensate for any imbalance in the machine or batteries. 3) If you have multiple packs centrally located and want to charge them all at once then gang the balance connectors with a harness (I think I've seen these ready made) and connect all the main powers wires together if you haven't already done this.
The lift lost to the dihedral is quite small and reduces the demands on the active stabilization because the effect of the dihedral is instantaneous, there is no lag and concern regarding dephasing. This is why most aircraft have a dihedral in that it decreases the demands on the pilot. We also placed the batteries in the center and below the craft's center of gravity to enhance stability. Very large multi rotors do not have the same maximum lift/ weight ratio as small, highly powered craft and are slower to respond to flight corrections. inherent stability is a big advantage.
@@TechIngredients Absolutely! Ultra heavy lift drones (50 to 250 kg of payload) have not only less lift/weight ratio, but also different flight characteristics because of inertia. We can not build a racer drone in such a scale. If a small racer drone can make, say 3 flips per second, then in large drone case it would not be possible to do at all. Even if it was physically done, the drone would just disintegrate mid air. Putting batteries closer to the motors would affect drone maneuverability especially around yaw axis (it is easier to start spinning empty carousel than full of kids). Drone has to be built so to survive also some harder landing and not just to support its own weight. Moving more mass farther from the center on the booms would cause higher load in the root of the booms and could easier “fold” them to the ground. Distributing mass closer to the center of gravity is right also because heavy lift drones usually are not made for flying around unloaded but made to lift things and the load is attached in the line with CG, otherwise the flight becomes inefficient because of uneven motor loading and reduced power reserve for more loaded motors.
Glad I've finally found your vids! Not all that familiar with multi-rotor copters but it took me several minutes to figure out what you are calling "rotors" were actually what I call propellers. In my ignorance, a "multi-rotor" drone is simply one that has 2 or more arms, each with some kind of thrust device. That "device" currently seems to be a propeller with one or more "blades". I will have to be careful in reading about "multiple rotors" having nothing do with the number of blades on the props! ;+) Perhaps this is the standard terminology for these kinds of 'flying devices. Look forward to seeing more of your exercises/experiments!
Hello my name is Justin Wilkes better known in the drone community as Swoop I am a freestyle pilot and Ariel videographer as well as Rc aircraft designer and engineer and from the perspective of someone who has been in the RC community for 20 years you are doing some really good work I really like the direction you are taking your research what grows the technology that advances us farther are people that are not afraid to experiment in the unknown keep up the good work.
Can you adopt me ? Ur kids are so lucky to have a dad that is this into building things of all caliber you know sooo much about so many things I aspire to be a dad like you one day , I have watched so many of ur videos and I think ur my favorite TH-camr as I am interested in many fields and you seem to have videos and knowledge on all of them , please never stop making videos
One thing, while this may be a 1.0 version ( or even a 0.7 to 0.9 ) in version 2.0 I would expect to see the wires to the motors moved either inside the tubes or to the bottom of the tubes. Reason being is that it would get them out of the rotor wash. I would also expect to see some sort of change to tubes that were only square at the ends with a triangular section in the middle. While it might take a slightly thicker material, the weight would stay about the same by the drag over the tubes from the prop wash would be decreased. In fact, a tear drop shape might be even better with the round part down. You mentioned the use of an autoclave in the making of the carbon fiber material. In the use of it, it really should be done with a vacuum on it first and then the pressure.The use of a vacuum would draw out any trapped air and then the use of pressure would force the materials together.
We did advance this design and ran the wires within the tubes. Only rectangular and circular tubes are available at a reasonable cost. You are correct, neither shape is aerodynamiclly optimal.
@@TechIngredients With your making of the blades, it shouldn't be too hard to get the foam company to make you the foam shapes that would work the best. I have been enjoying your series.
The arms on this drone look exactly the same length diameter and material as a modern day carbon fiber hockey stick! Using the hockey stick tech, you might be able to get these even lighter.
Quick hint, the square booms add significant resistance to the prop airflow. We made an aerodynamic boom under the prop, and found 65 percent increase in lift. The flat sides didnt make any difference in side wind resistance. In fact the prop thrust over ruled the wind speed, or craft speed at 70k, so there was no side wind seen to impact performance on the side of the boom arm - we also did testing in a wind tunnel, with fog to show wind was massively thrust downwards under the prop.
A 65 % increase in lift by changing only the aerodynamics of the boom is difficult to understand. This would suggest that if a bench test of your propeller was done without any boom at all, the increase would be at least 65%. Alternatively, if that same bench test was performed and an obstruction was inserted with the same dimensions and spacing of your original boom, the force against that obstruction would equal 65% of the propeller's thrust. I am skeptical.
Main parts: 9225-160KV Turnigy Multistar Brushless Multi-Rotor Motor Dynam 30x5.5 Carbon Fiber Propellers for Multirotors (I guess) Hobbywing Platinum Pro 50A V3 ESC Carbon Fibre Square Tube 20 x 20mm (I guess) 4S Batteries
Thank you for this deep knowledge on this subject.This video was the gem out of all dronevideos on the internet. I would love updates about this project. Just one question: I don't quite understand the theory behind the 8 propellers instead of 4. As I understand it, the (very low) efficiency losses of the motors and swirls from the props should be a reason to consider 4 instead of 8? Am i wrong? (I know the video is 3 years old but i would really be happy to get an answer, thank you!)
@@TechIngredients Oh okay. I get it, the rotor number is tied to your design goal to maximise lift. I'm just interested in a smaller payload (2-4kg), i think that is possible with 4 props. I appreciate you taking the time to answer my comment on a 3 year old video! Thanks!
Excellent design and build. Making the top and bottom plates of unequal thickness was a good call. It's a great drone! You might be able to save a little weight for free by using larger radii for the tube brackets, but you may have to be a but more careful with it while it is folded. Seeing that you have carbon sheet goods, perhaps you could make some carbon washers for many of the places, where galling might not be an issue. Stover (ovalized) might be lighter than the Nylock nuts, though would only be appropriate for the fasteners which remain fastened. Bicyclists and motorcyclists have made titanium fasteners more common, but they lack in toughness compared to steel. [If you ever do make another you might use Grade 8/ Class 12.9 fasteners of smaller diameter.] Because the props are close to the tube it might be a bit more efficient to use a symmetrical airfoil near the motor, with the trailing edge facing down. If the props were higher from the tubes it would lessen the difference, but spacers would cost weight. If the motor drivers get hot, could they be moved under the props? Good videos. Thanks.
Boy, you have a lot of interesting ideas. Some we have considered, but many we have not. Larger radii? Do you mean larger outboard positioning of the aluminum folding brackets, larger spacing of the pivot screws or larger tube diameters. There are trade offs for each of these decisions, but maybe you meant something else. For the larger and many of the smaller Nylocks we have converted to aluminum. This was an EASY improvement...many are not. Strength is rarely an issue with fasteners for these craft, but point loading is. Load distribution with the lightest fasteners that are practical is often preferable. Titanium is not likely to be an advantage unless we wanted to sell this project and we needed to make the brochure sexier. The large rotors we built in subsequent videos were much easier to construct with a flat lower surface. A different construction method might allow this degree of freedom. Why would airfoil symmetry vs say AOA be useful near the motors?
Well, sometimes the obvious eludes the genius? I should think that the point of diminishing returns is not far off from your design, but are a few grams here and there that might be saved, which add up, and add up to a few more seconds of flight--or a slower decent on a hard landing. I meant a larger radius on the metal bracket, which holds long carbon spars/struts (which hold the motors.) Sometimes, when I draw up things, I ask myself: what has the right and justification to be here. I haven’t seen aluminum Nylocks. Interesting, thanks. Yes, I should think that point-loading / stress concentration is difficult because-not only because carbon fiber a little brittle, but it is so stiff elsewhere which yields little. I’ve worked with fiberglass a fair bit, but that’s much more forgiving. I thought that the spars/struts could be given a symmetrical airfoil shape to let the air pass around, to minimize the stagnation around the sides of the tube. Merging in with your box attachment idea, I drew up this quickie Rhino3D drawing. I’ve tried to keep the faired airfoil shape constant to the edge of the prop. www.dropbox.com/s/advi8vwf804woqw/Quad%20End.jpg?dl=0 Cheers P.S. Some free stuff: openfoam.org www.salome-platform.org/ code-aster-windows.com/ www.code-saturne.org/cms/ www.paraview.org/
Remember the old adage, "A good tool is one you can't add anything to and a great tool is one you can't take anything from". I appreciate your approach. You might find it interesting to take a look at the history of the development of the early Lotus automotive racing team. They carried this philosophy literally to destruction! Nice CAD. Now, I understand your comment about the arms, interesting, but remember the greatest impact will be where the rotor-wash velocity is greatest. Also, keep in mind that the arms have to resist torsional forces to prevent the discs from oscillating when maneuvering. They will need an increased cord length to compensate for the narrower profile. Still don't understand about the brackets. They are more massive than the arms and the central plate is heavier than both.
I believe that your reasoning for having the Dihedral is similar to the pendulum rocket fallacy. I used to think that way with plane wings too, however the force vector doesn't affect the roll of a plane. it's the difference in forces between the 2 wings that causes the correcting roll and this force is created because of the effect of dihedral on the angle of attack of the wing. Ps, sorry 3 years late
@@TechIngredients Jayson is right, in stable air adding tilt to the arms does absolutely nothing for stability. There is no pendulum effect by tilting the arms, weight does not "hang" anywhere on the body of the quadcopter, gravity only acts through the center of mass. If you draw a free body diagram and the accompanying forces you will see this .
@@TechIngredients13:25 In your explanation in the video you talk about the vertical component of the thrust vector, but you forget to mention the horizontal component. The rotor that is higher has a bigger horizontal component than the lower one, which exactly compensate the vertical vector component you talked about in the video. I'm afraid my favorit material physics professor fell for the pendulum fallacy.
Tech Ingredients Could you email me at shawnpwest at gmail dot com please? I tried contacting you via Facebook but it doesn't look like you use it much.
I really like how technical you get, I imagine you are probably an engineer by profession just based on your detail and nerdy-ness lol (sure you might not be, but if you arent you should be). Much appreciate it as an engineering student myself who likes to know specifics of design.
G’day again mate. Have you considered doing a vid on hoist winches for heavy lift drones? There is a major gulf in the available range right where UAV’s sit. I can’t find a suitable unit anywhere. The units for the Bait Boats camera cable are the closest I can find but the manufacture is unwilling to sell unless it’s part of one of their steeply priced packages. Cheers and thanks again for sharing your knowledge with everyone.
Excellent video. Thank you! It's worth trying other firmware on your ESCs, if only to disable ESC braking which is great on a racer, but wastes energy and buys nothing on a heavy, yet is a default behavior on a lot of ESCs.
Good video. I'm wondering if there would be an advantage to horizontally offsetting the rotors or simply adding four more rotors in an inner circle on the same struts. If you could control 12 rotors at once, it seems like you could fit the additional four on the same horizontal plane, just closer to the center.
If you look at gain distribution tubes used at grain elevators (farms), you will see wires (under tension) on four sides of the tubes keeping them straight. This may be a good way to further reduce the weight of the rotor arms and still keep the rigidity needed for the rotors.
Typically those elevators are constructed from concrete segments and concrete has good compressive strength, but very poor tensile strength. This is the principle that underlies pre stressed concrete engineering. Carbon fiber has balanced compressive and tensile strength and the value of additional stringers would be low.
@@TechIngredients I was referring to the grain tubes that feed the grain from the leg, to the top of the silos. Without the tension wires, they would fold under their own weight.
Having seen all the copper wires made me think of their weight! How plausible is it to mount the battery and controller closer to the motor, in the right format it can even fit inside the rectangular bar so it has little air drag, high current copper wires are heavy and lossy, cooling of both the battery and controller are easier to manage there as well. What I like very much to know is how it affects the flight and handling of the drone when the weight is moved from centre to the outside? P.S I love your videos.
Thanks! The copper will have to get there one way or another. Either to power the ESC or for the ESC to power the motor. Ultimately, aluminum would be a better conductor. It's 1/3 the weight and about 2/3 of the conductivity of copper.
Heres a idea: How about adding second set of motors and bladed middle of the arms doubling the carrying capacity? Control system should not be issue, just reduce control values with certain % and slave one controller to another if there is no space for extra motors. This does create wingtip vortexes, but should not adding foldable ring around the blade (essentially making it ducted fan) remove some of this? Or just increase arm length bit more, so each blades vortex wont cause issues. I'm amateur when it comes to RC or anything flying, but with my limited knowledge i believe this should work.
The second set of motors will have limited clearance and therefore the propellers will have to be smaller and therefore much less efficient. Another option would be to use interspersed large and very large propellers on the end of each arm. If you can visualize what I'm describing, this arrangement allows for larger props on the same frame size, increasing efficiency. The use of ducts is a trade off. They increase efficiency, but they add weight. Generally, they aren't worth it.
We did, including a simple, single, but large, gas powered rotor to negate the majority of the payload and multi rotor weight. In these cases, the structure of the multi rotor has to be modified vs hanging an independent module. These alternatives are attractive and if designing from scratch, I would seriously consider them.
Very very beautyfull machiine! Thanks for all of your videos! Great hobbies - great lifestyle! Let’s enjoylife! Goodluck - MAY the force be with us! :) #everyday #thankyou
I love your videos, I would like to see you stick to using a lapel mic. I know there is a bit more effort in syncing and editing, but the professionalism is far better. Thanks
looks great! I wish we could have seen it laid out as in flight configuration. those booms look really long compared to the size of the props, but i'm guessing that's because it's an 8 rotor system. and you need more clearance between props on the sides than you do in the middle
Our short, flight demo video shows our 6 rotor model unfolded. Its even larger than this one. In both cases, the booms are overly long to allow larger props to be installed.
I am curious of HOW big you will go. I still have one question unclear: Is it true that the most efficient propellers for heavy lift drone in terms of( thrust)/(consumed power) are those with largest diameter that can be physically fit in a given dimensions of drone? We know that any drone has its external dimensions that are not limitless out of many reasons. If, for example, you have an X4 mixer configuration drone that shapes a square - what would be more efficient - having 4 rotors that physically fits into that square or 8/12/16... rotors controlled in the same X4 config but in 4 groups of n rotors each that also fill that square?
Triangulation? Would there be any benefit in having 1 centralised "master pole" running through the center and from the center platform down say 12 inches in which support wires eminate from to each motor? This way the aluminium that ties in each carbon fibre arm and the holes in those arms would not experience the large bending moment and could then theoretically be less beefier and lighter weight. I imagine this has been considered though, did you knock it back, and for what reason? Love this channel btw you have partly inspired me to get off my butt and build a DIY gas turbine.
About making carbon fiber; wouldnt baking acrylonitrile release large volumes of stinky gas, and is it somehow collected? Seems like a very good thing to have. I recall being able to use it for a resistor or low current conductor.
Question do you think it's good to couple lightweight portable hand- power cranks to your rotary or by a separate servo motoring .power supply and power sensor with cut of breaker switch?
Hi Tech Ingredients, Since you're generously answering questions 2 years after posting this, my question is how fight performance has worked out? The trouble with 160kv motors & 30" props is slow reaction times during wind gusts which has been blamed for the crashes of some similar builds. You gain efficiency at the cost of responsiveness. I nearly built a similar rig to hang $7-8k of camera from but put the design on hold after reading of some wind related failures. Any thoughts!?
That has been a major challenge. When combined with DJI's limited user information we have had some crashes. The inexpensive props and motors are easy to replace, but as you say, the payload, not to mention what it hits might not be.
@@TechIngredients Thanks heaps for this update and potential confirmation. Again, I really appreciate your generosity. On a side note, I've noticed one manufacturer of commercial specialist heavy lift cine drones have changed their battery location and now stacks them on the top layer. I was really puzzled by this. Why are they trying to re-balance the COG that would otherwise sit way below the motors due to the cine camera/gimbal payload? Perhaps the same reason? To make it easier for the motors to respond to wind gusts, rather than wind potentially creating a pendulum action (or worse) that the motors can't as easily compensate for due to the much greater torque needed to overcome the low slung COG...??
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Listening to you talk is like hearing the essence of all physics classes I've ever had through school, and later. It's just so relaxing not having to question what you say, and just nodd in acceptance every time you make a statement. So true.
As a designer and builder of commercial drones I was very impressed, as always, with you presentation.
Considering your in depth analysis with everything you do I was a little let down right at the end when you opted for closed DJI flight control system.
Are you aware of the Ardupilot project, currently being used by such big names as NASA and Boeing?
This is a fully featured open source autopilot source involving software, firmware and hardware.
Everything you do you are making open source with your detailed content which enhances us all.
I just thought this would place your flight controller, the most critical component in any multi rotor, and the only thing that makes them controllable in the air, as open source as everything else you are doing.
For your consideration.
Keep up the great content.
Spot on.
Great points!
This is one of my favorite videos thus far. All of the information and thorough explanations captivate me! Reading through the comment section is also a breath of fresh air. It's great to see people inspired with science and engineering.
Really like your channel, it's rich in technical nomenclature. Like the way your explanations go beyond just the objects themselves and into the material and technical sciences that make up their design.
One day, please do a video on your aircraft construction experience regarding carbon fiber. Sounds fascinating.
What do you think of weight reductions schemes such as using aluminum wiring and fasteners, Copper wire and steel bolts are so passe' Hollow shank 7075/ 2024 bolts would be the cats ass for these ships. Every oz carried aloft costs billions of electrons.
Thanks!
The balance we are striving for is useful information without extrapolating from dogma. If the viewer comes away thinking "now I get it, it's not really complicated and I bet I could do something even better if I just tried..." Perfect.
Your suggestion about the bolts is excellent. Explain the engineering principal of mechanical modulus, find an elegant way to drill out existing aluminum hardware, test the practical balance of strength vs lightness and that would be the kind of video we would do.
nomenclature? wtf iz that? he never mentioned it.
@@weatherphobia lol, the irony. It's the lexicon used in a domain
I found this yesterday after my dad sent me a link and for once there’s a TH-cam that shows everything we want to see and explains it in such a good way
Loving your videos so much
Having studied some of these concepts in school, I have to say you have an amazing knack for technical communication. Much better than some of my professors. Great video.
OUTSTANDING VIDEO! You have clearly put a lot of analytical thought into this project! Well done, looking forward to the next video. Thank you!
In my growing years there was on TV most Saturdays / Sundays a science show. It was I remember (Mr. Wizard) you pick up where he left off. Getting some of we older folks to think of what is out in the world. Thank you, Alan
Sure. The motivation is the same.
Yes the world needs more of you...I genuinely thank you for these great videos you do and hope for much more to come
I'm in awe at the depth of your knowledge in all these videos.
I can't even imagine how you can have so much passion, patience, knowledge and determination to implement such complex projects from A to Z. All your videos are amazing
Wow, thank you!
draganfly is undoubtedly the best drone company!
It is providing support in ukraine by supplying ukrainian people with medicines, insulin and much more.
with this it is increasing its visibility and brand awareness.
has an experienced team and unique technology, currently very underestimated based on its potential!
Wow. 20mins, I don't think I even blinked once. Fascinating stuff. You are a wealth of information and experience. Who are you? Do you have any other ways I can follow your projects?
I love your videos - I am a retired aero engineer with lot's of aircraft and drone experience. I wish I had the ability to explain things the way you do. Your explanations of things do require some engineering and mechanical skills on the part of the listener which cannot be avoided without making it TOO simplified. When I watch your presentations I can follow the technical flow of what you are telling me usually on the first pass no matter how complicated the subject. Keep up the great videos....
I have a question, how do you make the least amount of supersonic drag?
You are just about the best science teacher I have ever seen, and I had 24 years of education before I was through, although I ended up with degrees in "political science" (which isn't a science at all) and law. Please tell me that you don't merely make TH-cam Videos. You do teach at some college, right? You have a talent that, unfortunately, is far too rare in my profession as a lawyer, which is that you explain complex concepts in plain English without wasting a lot of time or words.
Thanks!
I assume the viewer genuinely wants to understand and is able to understand. All I have to do is link principles to what is already known.
Cant wait for the next video - this is exactly what we need for a delivery system, thanks
That message is angling the rotors slightly off of vertical also prevents a condition during rapid descent known as Vortex ring State. This is a dangerous condition which can cause the aircraft crash.
"Dihedral looks sexier & I like that too " says the polymath genius :) Earned a favorite video spot on my list! Cheers buddy!
For anyone wondering, ESC= Electronic speed controller, and is required to drive brushless motors.
You are so good at explaining everything. I do wish you'd been my teacher - or dad!
Ask for adoption?
Your Videos really help me to design my own stuff!
Great!
IMHO: Your FANTASTIC VIDEOS ARE AWESOME, INFORMATIVE, and BETTER THAN ANYONE ELSE'S!!!! WOW!!!!! VERY INTERESTING, and INFORMATIVE!!!! YOU'RE LIVING THE DREAM!!!
Excellent explanations of some basic engineering concepts. Looking forward to seeing that thing fly!
Very intelligent explanations on the reasons for the choices made. Wow
Ok. I stumbled across your channel somehow... but now I'm hooked. Love your deep knowledge of all the engineering details. It's like you were born with an erector set in your hands and just kept building and creating for the rest of your life! ;-) Great Work!
Why are these types of videos not the most popular on You tube. I love watching your videos. I learn a lot. Learning and passing on what we learn has to be one of the most important aspects of human life. Thank you. What did you do for a career?
every time I am surprised by how much I learn
thanks a lot man you have a great brain
Informed intelligent articulate and entertaining presentation, thank you!
I had to look up what an ESC is (Electronic Speed Control), just in case anyone else had the same question. all good wishes.
Great video again. Thanks Great Topic
I'm so entertained by his videos,such good education and knowledge explained in a understandable way
I'm just starting the drone/propeller videos. Did you happen to see Mark Rober's drone video from 3/18/23? The drones in this video have a unique, asymmetric prop design to reduce noise substantially. He explains it about 15.5 minutes into the video. I'm looking forward to watching the rest of your drone video series!
I didn't. I'll check it out.
Really good video!
There are two points that occur to me (and you may have looked at and discounted them)
1. Carbon conducts electricity! Why not use it as a return path for your motors / batteries reducing the wiring needed!
2. The propellers you have seem to be almost uniform in depth of materiel. This would simply have the effect of pushing the air in one direction. If you look at the cross section of any lifting body (plane propeller, wing, windfarm blade etc) you see there is a more complex form where the lift is generated by the paths of air above and below having different lengths causing a partial vacuum being formed at certain speeds! This lift is actually greater than the force of the air being pushed downwards!
As I have said they may have already been discounted for good reason!
Carbon is conductive, but not very much. That means it is very efficient at turning electricity into heat. The energy lost would almost certainly be more than the weight savings of some wire.
About the manufacture of composite parts...The industrial process of manufacturing light epoxy resin parts is usally done with PrePreg (i.e. rovings or mats of fibre preimpregnated with epoxy resin). It can be kept cooled (under -18°C) for up to two years, or at room temperature for a few days, before it cures. To assemble a part, you stack the layers over a mandrel or inside a mold, depending on required dimension, and then reduce the amount of resin and cure it. This happens,as you mentioned, in an autoclave where heat and vacuum can be applied onto the part. As the resin cures under heat, it liquifies and the unneccesary resin is sucked from the part. That resin is catched up by layers of fabric wrapped around it,over a permeable teflon mat you just can peel off later. Not really feasible for a single build,but if you need a custom shape and more than once, maybe it can be useful to be able to do it. Also, on the point of carbon fibre failing under load - I know that when you would manufacture a custom part that you expect to experience a lot of stress, you would incorporate a layer of kevlar, which prevents the whole structure from failing just because individual strands of carbon broke.
You're point about kevlar is true. Sometimes it is misunderstood that blending the kevlar and the carbon produce a superior composite other than Kevlar's ability to stabilize fragments.
holy moly the knowledge depth! thank you
Have you looked into the arducopter platform? I think it is a more mature flight system than what DJI has. Especially with the new Pixhawk 4.
Do you have a website with more of the technical specs and parts?
very nice construction, modular thoughts, very nice design, exactly as I would have wanted it !
the best description of dihedral yet!.. thanks
Thanks. Have you taken a look at some of our other videos?
I will be, your edification rate sync's nicely with my receptors.
What an awesome explanation. I feel like I can start trying to build one myself now.
Request: please add web links to the products that you pick or web sites that you find useful. Some people put this in the description but I gather that that has problems and so other sites put the information in a comment and then "pin" the comment so it stays on top.
I just discovered this channel a week or so ago and I'm poking around going through the various topics. Excellent work. I hope you are still making videos.
Thanks for the suggestion.
We're working on several new ones right now.
Another quality video from TI. Thanks!
I am really curious what this guy was doing before he started making educational youtube videos / he sounds like a physics professor crossed with a gifted mechanic & machinist with a spirited teacher talent & gifting & very articulate & intelligent! I would be honored to meet him in first person!
Learned a lot, love the detailed explanations
Great video and you are my idol :-) there is however one thing I disagree with in your design. I would not charge the batteries on board. About a year ago, I had a battery fire for no apparent reason. There was no damage to the area around the battery since I had it in a fireproof bag, but with your design if you were to have a fire, it would take out part of your creation. Other than that I love everything about your drone. You just got another subscriber.
On drone charging is the future. Roll with it.
Yeah, drop and roll.
I agree.. this guy for president.. hell world leader for all I care. An overload of skills.. its stunning
In the oversized bolt discussion at 11:00, you might consider on future projects to bond an aluminum cylinder through the hollow spar for the bolt to ride in. I think this would be stronger enough that you could use a smaller bolt to achieve the same weight as before, but much stronger than the current arrangement. Excellent videos, good details as to the choices made. I learn something new every time...
Thanks!
You're suggestion might be a little lighter, but it probably won't be stronger. The spar can't accommodate a larger diameter aluminum tube, bolt etc.
Thank you for sharing all this knowledge.
Amazing! Thank you so much for your videos
Thank you for watching and for your support.
Bring medical supplies to remote areas where roads are impassable much of the year.
I've used my Phantom 4 Pro to erect a 90 foot vertical antenna. It's my best antenna on 160m.
LEARNED ALOT! and i have basically given up on trying to build a quad-copter! i was going to use 12 double same motors as your but if that fails with double props its pointless. unless again you can build a bigger motor! but again their is the cost of the prop!
YOU'RE A GENIUS!!!
I keep saying that!
My family just rolls their eyes.😕
This is a compliment, I think you can make an autoclave // or buy a used one to fix & upgrade it // given that you can design & make controllers & are familiar with vacuum pumps & vacuum bagging / & metal fab / you could probably make a propane heated, nitrogen purged, steel tube with hydraulic door & oilless compressor // DIY orbital welding & DIY NDT camera for testing analysis for safety to make sure its welded without defects so it does not turn into a pipe bomb when operating // You can buy the larger steel ring sections prefab & have then sent on a flatbed/ Premake the foundation & then mount it & finish it, then cover with a shed or steel building /// the heat from the autoclave will warm the building // then you can DIY some dope custom carbon fiber stuff //
Hi i'm a composites technician and your explaination are very good and very interesting project.
Project and rock solid engineering. Having saif that I wanted to chime in with a few comments, they're worth what you paid for them:
1) Why take the efficiency loss from the dihedral if you have an actively stabilized aircraft?
2) If you're willing to have multiple battery packs, as apparently you are, you can save a lot of losses by moving the packs near the motors. The bulk of the energy is flowing to the motors so you don't need to have the weight and losses of all thatheavy copper wire plus the frame structure can be built lighter because the arms don't have to support the weight of the batteries in flight at the shoulders. If you want you can have small gauge wires coming into the center to keep all the packs at the same voltage to compensate for any imbalance in the machine or batteries.
3) If you have multiple packs centrally located and want to charge them all at once then gang the balance connectors with a harness (I think I've seen these ready made) and connect all the main powers wires together if you haven't already done this.
The lift lost to the dihedral is quite small and reduces the demands on the active stabilization because the effect of the dihedral is instantaneous, there is no lag and concern regarding dephasing. This is why most aircraft have a dihedral in that it decreases the demands on the pilot.
We also placed the batteries in the center and below the craft's center of gravity to enhance stability. Very large multi rotors do not have the same maximum lift/ weight ratio as small, highly powered craft and are slower to respond to flight corrections. inherent stability is a big advantage.
@@TechIngredients Absolutely! Ultra heavy lift drones (50 to 250 kg of payload) have not only less lift/weight ratio, but also different flight characteristics because of inertia. We can not build a racer drone in such a scale. If a small racer drone can make, say 3 flips per second, then in large drone case it would not be possible to do at all. Even if it was physically done, the drone would just disintegrate mid air. Putting batteries closer to the motors would affect drone maneuverability especially around yaw axis (it is easier to start spinning empty carousel than full of kids). Drone has to be built so to survive also some harder landing and not just to support its own weight. Moving more mass farther from the center on the booms would cause higher load in the root of the booms and could easier “fold” them to the ground.
Distributing mass closer to the center of gravity is right also because heavy lift drones usually are not made for flying around unloaded but made to lift things and the load is attached in the line with CG, otherwise the flight becomes inefficient because of uneven motor loading and reduced power reserve for more loaded motors.
Those are some serious motors
Glad I've finally found your vids! Not all that familiar with multi-rotor copters but it took me several minutes to figure out what you are calling "rotors" were actually what I call propellers. In my ignorance, a "multi-rotor" drone is simply one that has 2 or more arms, each with some kind of thrust device. That "device" currently seems to be a propeller with one or more "blades". I will have to be careful in reading about "multiple rotors" having nothing do with the number of blades on the props! ;+) Perhaps this is the standard terminology for these kinds of 'flying devices. Look forward to seeing more of your exercises/experiments!
Hello my name is Justin Wilkes better known in the drone community as Swoop I am a freestyle pilot and Ariel videographer as well as Rc aircraft designer and engineer and from the perspective of someone who has been in the RC community for 20 years you are doing some really good work I really like the direction you are taking your research what grows the technology that advances us farther are people that are not afraid to experiment in the unknown keep up the good work.
Thank you, that means a lot!
Can you adopt me ? Ur kids are so lucky to have a dad that is this into building things of all caliber you know sooo much about so many things I aspire to be a dad like you one day , I have watched so many of ur videos and I think ur my favorite TH-camr as I am interested in many fields and you seem to have videos and knowledge on all of them , please never stop making videos
One thing, while this may be a 1.0 version ( or even a 0.7 to 0.9 ) in version 2.0 I would expect to see the wires to the motors moved either inside the tubes or to the bottom of the tubes. Reason being is that it would get them out of the rotor wash. I would also expect to see some sort of change to tubes that were only square at the ends with a triangular section in the middle. While it might take a slightly thicker material, the weight would stay about the same by the drag over the tubes from the prop wash would be decreased. In fact, a tear drop shape might be even better with the round part down.
You mentioned the use of an autoclave in the making of the carbon fiber material. In the use of it, it really should be done with a vacuum on it first and then the pressure.The use of a vacuum would draw out any trapped air and then the use of pressure would force the materials together.
We did advance this design and ran the wires within the tubes. Only rectangular and circular tubes are available at a reasonable cost. You are correct, neither shape is aerodynamiclly optimal.
@@TechIngredients With your making of the blades, it shouldn't be too hard to get the foam company to make you the foam shapes that would work the best. I have been enjoying your series.
I love everything about this guy.
Thanks!
The arms on this drone look exactly the same length diameter and material as a modern day carbon fiber hockey stick! Using the hockey stick tech, you might be able to get these even lighter.
Quick hint, the square booms add significant resistance to the prop airflow. We made an aerodynamic boom under the prop, and found 65 percent increase in lift. The flat sides didnt make any difference in side wind resistance. In fact the prop thrust over ruled the wind speed, or craft speed at 70k, so there was no side wind seen to impact performance on the side of the boom arm - we also did testing in a wind tunnel, with fog to show wind was massively thrust downwards under the prop.
A 65 % increase in lift by changing only the aerodynamics of the boom is difficult to understand. This would suggest that if a bench test of your propeller was done without any boom at all, the increase would be at least 65%. Alternatively, if that same bench test was performed and an obstruction was inserted with the same dimensions and spacing of your original boom, the force against that obstruction would equal 65% of the propeller's thrust. I am skeptical.
So add 15inch long triangles made out of styrofoam they weight nothing but booms will be aerodynamic. But 65% is BS
Main parts:
9225-160KV Turnigy Multistar Brushless Multi-Rotor Motor
Dynam 30x5.5 Carbon Fiber Propellers for Multirotors (I guess)
Hobbywing Platinum Pro 50A V3 ESC
Carbon Fibre Square Tube 20 x 20mm (I guess)
4S Batteries
How nice of you.
Thank for great video.
Thank you for this deep knowledge on this subject.This video was the gem out of all dronevideos on the internet. I would love updates about this project.
Just one question:
I don't quite understand the theory behind the 8 propellers instead of 4.
As I understand it, the (very low) efficiency losses of the motors and swirls from the props should be a reason to consider 4 instead of 8? Am i wrong?
(I know the video is 3 years old but i would really be happy to get an answer, thank you!)
We just wanted more lift for this airframe without compromising effeciency.
@@TechIngredients Oh okay. I get it, the rotor number is tied to your design goal to maximise lift. I'm just interested in a smaller payload (2-4kg), i think that is possible with 4 props.
I appreciate you taking the time to answer my comment on a 3 year old video! Thanks!
Excellent design and build. Making the top and bottom plates of unequal thickness was a good call. It's a great drone!
You might be able to save a little weight for free by using larger radii for the tube brackets, but you may have to be a but more careful with it while it is folded. Seeing that you have carbon sheet goods, perhaps you could make some carbon washers for many of the places, where galling might not be an issue. Stover (ovalized) might be lighter than the Nylock nuts, though would only be appropriate for the fasteners which remain fastened. Bicyclists and motorcyclists have made titanium fasteners more common, but they lack in toughness compared to steel. [If you ever do make another you might use Grade 8/ Class 12.9 fasteners of smaller diameter.]
Because the props are close to the tube it might be a bit more efficient to use a symmetrical airfoil near the motor, with the trailing edge facing down. If the props were higher from the tubes it would lessen the difference, but spacers would cost weight.
If the motor drivers get hot, could they be moved under the props?
Good videos. Thanks.
Boy, you have a lot of interesting ideas.
Some we have considered, but many we have not. Larger radii? Do you mean larger outboard positioning of the aluminum folding brackets, larger spacing of the pivot screws or larger tube diameters. There are trade offs for each of these decisions, but maybe you meant something else. For the larger and many of the smaller Nylocks we have converted to aluminum. This was an EASY improvement...many are not. Strength is rarely an issue with fasteners for these craft, but point loading is. Load distribution with the lightest fasteners that are practical is often preferable. Titanium is not likely to be an advantage unless we wanted to sell this project and we needed to make the brochure sexier.
The large rotors we built in subsequent videos were much easier to construct with a flat lower surface. A different construction method might allow this degree of freedom. Why would airfoil symmetry vs say AOA be useful near the motors?
Well, sometimes the obvious eludes the genius? I should think that the point of diminishing returns is not far off from your design, but are a few grams here and there that might be saved, which add up, and add up to a few more seconds of flight--or a slower decent on a hard landing.
I meant a larger radius on the metal bracket, which holds long carbon spars/struts (which hold the motors.) Sometimes, when I draw up things, I ask myself: what has the right and justification to be here.
I haven’t seen aluminum Nylocks. Interesting, thanks.
Yes, I should think that point-loading / stress concentration is difficult because-not only because carbon fiber a little brittle, but it is so stiff elsewhere which yields little. I’ve worked with fiberglass a fair bit, but that’s much more forgiving.
I thought that the spars/struts could be given a symmetrical airfoil shape to let the air pass around, to minimize the stagnation around the sides of the tube.
Merging in with your box attachment idea, I drew up this quickie Rhino3D drawing. I’ve tried to keep the faired airfoil shape constant to the edge of the prop.
www.dropbox.com/s/advi8vwf804woqw/Quad%20End.jpg?dl=0
Cheers
P.S. Some free stuff:
openfoam.org
www.salome-platform.org/
code-aster-windows.com/
www.code-saturne.org/cms/
www.paraview.org/
Remember the old adage, "A good tool is one you can't add anything to and a great tool is one you can't take anything from". I appreciate your approach. You might find it interesting to take a look at the history of the development of the early Lotus automotive racing team. They carried this philosophy literally to destruction!
Nice CAD. Now, I understand your comment about the arms, interesting, but remember the greatest impact will be where the rotor-wash velocity is greatest. Also, keep in mind that the arms have to resist torsional forces to prevent the discs from oscillating when maneuvering. They will need an increased cord length to compensate for the narrower profile.
Still don't understand about the brackets. They are more massive than the arms and the central plate is heavier than both.
That is a huge drone!
I believe that your reasoning for having the Dihedral is similar to the pendulum rocket fallacy. I used to think that way with plane wings too, however the force vector doesn't affect the roll of a plane. it's the difference in forces between the 2 wings that causes the correcting roll and this force is created because of the effect of dihedral on the angle of attack of the wing.
Ps, sorry 3 years late
I disagree. Unlike a wing where the angle of atack is affected by the roll, the rotor's lift is not. Only the vector of its force changes.
@@TechIngredients Jayson is right, in stable air adding tilt to the arms does absolutely nothing for stability. There is no pendulum effect by tilting the arms, weight does not "hang" anywhere on the body of the quadcopter, gravity only acts through the center of mass. If you draw a free body diagram and the accompanying forces you will see this .
@@TechIngredients13:25 In your explanation in the video you talk about the vertical component of the thrust vector, but you forget to mention the horizontal component. The rotor that is higher has a bigger horizontal component than the lower one, which exactly compensate the vertical vector component you talked about in the video.
I'm afraid my favorit material physics professor fell for the pendulum fallacy.
You have motherboard boxes, looks like external hard drive boxes but you've got a couple of spools of carbon fiber. All things I love. "-)
My son builds the computers, I just glue things together.
Tech Ingredients Could you email me at shawnpwest at gmail dot com please? I tried contacting you via Facebook but it doesn't look like you use it much.
I really like how technical you get, I imagine you are probably an engineer by profession just based on your detail and nerdy-ness lol (sure you might not be, but if you arent you should be). Much appreciate it as an engineering student myself who likes to know specifics of design.
Thanks!
G’day again mate. Have you considered doing a vid on hoist winches for heavy lift drones? There is a major gulf in the available range right where UAV’s sit. I can’t find a suitable unit anywhere. The units for the Bait Boats camera cable are the closest I can find but the manufacture is unwilling to sell unless it’s part of one of their steeply priced packages. Cheers and thanks again for sharing your knowledge with everyone.
I just learned a shitload! Nice job man!
Thanks!
Excellent video. Thank you! It's worth trying other firmware on your ESCs, if only to disable ESC braking which is great on a racer, but wastes energy and buys nothing on a heavy, yet is a default behavior on a lot of ESCs.
Good video. I'm wondering if there would be an advantage to horizontally offsetting the rotors or simply adding four more rotors in an inner circle on the same struts. If you could control 12 rotors at once, it seems like you could fit the additional four on the same horizontal plane, just closer to the center.
Maybe, but the additional lift would be significantly less due to the diameter of the inner rotors.
I shared this on Facebook!!!
This guy is a legend!!
If you look at gain distribution tubes used at grain elevators (farms), you will see wires (under tension) on four sides of the tubes keeping them straight. This may be a good way to further reduce the weight of the rotor arms and still keep the rigidity needed for the rotors.
Typically those elevators are constructed from concrete segments and concrete has good compressive strength, but very poor tensile strength. This is the principle that underlies pre stressed concrete engineering.
Carbon fiber has balanced compressive and tensile strength and the value of additional stringers would be low.
@@TechIngredients I was referring to the grain tubes that feed the grain from the leg, to the top of the silos. Without the tension wires, they would fold under their own weight.
i learned more from this video than from a whole school year
Did you ever come around to doing the setup video for this drone? I'm really curious to see the build progress.
keep thinking im watching Cody from the future :D
Great drone!
Another good show!
Having seen all the copper wires made me think of their weight! How plausible is it to mount the battery and controller closer to the motor, in the right format it can even fit inside the rectangular bar so it has little air drag, high current copper wires are heavy and lossy, cooling of both the battery and controller are easier to manage there as well. What I like very much to know is how it affects the flight and handling of the drone when the weight is moved from centre to the outside? P.S I love your videos.
Thanks!
The copper will have to get there one way or another. Either to power the ESC or for the ESC to power the motor.
Ultimately, aluminum would be a better conductor. It's 1/3 the weight and about 2/3 of the conductivity of copper.
Heres a idea: How about adding second set of motors and bladed middle of the arms doubling the carrying capacity? Control system should not be issue, just reduce control values with certain % and slave one controller to another if there is no space for extra motors. This does create wingtip vortexes, but should not adding foldable ring around the blade (essentially making it ducted fan) remove some of this? Or just increase arm length bit more, so each blades vortex wont cause issues.
I'm amateur when it comes to RC or anything flying, but with my limited knowledge i believe this should work.
The second set of motors will have limited clearance and therefore the propellers will have to be smaller and therefore much less efficient. Another option would be to use interspersed large and very large propellers on the end of each arm. If you can visualize what I'm describing, this arrangement allows for larger props on the same frame size, increasing efficiency.
The use of ducts is a trade off. They increase efficiency, but they add weight. Generally, they aren't worth it.
Sir, your are an amazing builder and way smarter than I am. I’m wondering if you need a heavy lift drone have you considered a Coaxial Rotor?
We did, including a simple, single, but large, gas powered rotor to negate the majority of the payload and multi rotor weight. In these cases, the structure of the multi rotor has to be modified vs hanging an independent module. These alternatives are attractive and if designing from scratch, I would seriously consider them.
Very very beautyfull machiine! Thanks for all of your videos! Great hobbies - great lifestyle! Let’s enjoylife! Goodluck - MAY the force be with us! :) #everyday #thankyou
Great video! Thank you
I love your videos, I would like to see you stick to using a lapel mic. I know there is a bit more effort in syncing and editing, but the professionalism is far better. Thanks
We are now. This video is several years old.
He does love this things obviosly!
looks great! I wish we could have seen it laid out as in flight configuration. those booms look really long compared to the size of the props, but i'm guessing that's because it's an 8 rotor system. and you need more clearance between props on the sides than you do in the middle
Our short, flight demo video shows our 6 rotor model unfolded. Its even larger than this one. In both cases, the booms are overly long to allow larger props to be installed.
I am curious of HOW big you will go. I still have one question unclear: Is it true that the most efficient propellers for heavy lift drone in terms of( thrust)/(consumed power) are those with largest diameter that can be physically fit in a given dimensions of drone?
We know that any drone has its external dimensions that are not limitless out of many reasons. If, for example, you have an X4 mixer configuration drone that shapes a square - what would be more efficient - having 4 rotors that physically fits into that square or 8/12/16... rotors controlled in the same X4 config but in 4 groups of n rotors each that also fill that square?
Triangulation?
Would there be any benefit in having 1 centralised "master pole" running through the center and from the center platform down say 12 inches in which support wires eminate from to each motor? This way the aluminium that ties in each carbon fibre arm and the holes in those arms would not experience the large bending moment and could then theoretically be less beefier and lighter weight. I imagine this has been considered though, did you knock it back, and for what reason? Love this channel btw you have partly inspired me to get off my butt and build a DIY gas turbine.
In principle, that should work and I don't see any problems as long as it doesn't interfere with cameras and sensors located below the main body.
About making carbon fiber; wouldnt baking acrylonitrile release large volumes of stinky gas, and is it somehow collected? Seems like a very good thing to have. I recall being able to use it for a resistor or low current conductor.
Question do you think it's good to couple lightweight portable hand- power cranks to your rotary or by a separate servo motoring .power supply and power sensor with cut of breaker switch?
I am really impressed at your work!
Could you please put links to the companies from which you bought rotos and other stuff?
Thanks in advanmce
Great information!
You can have a propeller with "1" blade and you can make the square tube aerodynamic better with very light foam-material.
Hi Tech Ingredients,
Since you're generously answering questions 2 years after posting this, my question is how fight performance has worked out? The trouble with 160kv motors & 30" props is slow reaction times during wind gusts which has been blamed for the crashes of some similar builds. You gain efficiency at the cost of responsiveness. I nearly built a similar rig to hang $7-8k of camera from but put the design on hold after reading of some wind related failures. Any thoughts!?
That has been a major challenge. When combined with DJI's limited user information we have had some crashes. The inexpensive props and motors are easy to replace, but as you say, the payload, not to mention what it hits might not be.
@@TechIngredients Thanks heaps for this update and potential confirmation. Again, I really appreciate your generosity.
On a side note, I've noticed one manufacturer of commercial specialist heavy lift cine drones have changed their battery location and now stacks them on the top layer. I was really puzzled by this. Why are they trying to re-balance the COG that would otherwise sit way below the motors due to the cine camera/gimbal payload? Perhaps the same reason? To make it easier for the motors to respond to wind gusts, rather than wind potentially creating a pendulum action (or worse) that the motors can't as easily compensate for due to the much greater torque needed to overcome the low slung COG...??
Nice to have these followups :-)