Im just having the best of time investigating the dynamics of this craft and happy to share my findings with other fellow aviation enthusiasts! Dreaming of a flying RV /camper at the moment and trying to imagine how a mini stove made out of 0.1mm stainless steel might look like....LOL
This has been a fascinating project so far. I really enjoy watching the progress and testing. So graceful. I appreciate your knowledge and design skills. Thank you for showing us. 👍👍
Two points that I want to make: Helicopters run their propeller at constant speed and only change the collective pitch, in order to be able to descend without introducing stall. In the first tufting test, you can see that the air on the inner parts of the wing is being blown towards the wing tips (along the wing) more than it is being blown across the wing.
The lack of efficiency decrease is probably due to the fact that the inner portions were pretty much pushing flat into the wind, creating a lot of drag and little lift. Removing the fabric removes that drag, but replaces it with vortex drag so no efficiency increase either. Better to reduce the twist so the inner portion has a reasonable angle of attack. Also could add full width ribs on the inner section to give the top side a lot of curvature, allowing higher AOA before stall. Regarding the descent stall problem, I don't think it can be solved without turning it into an ordinary tip jet helicopter. You need variable pitch so you can tilt the lift vector forward, turning that upward airflow into acceleration of the rotor RPM and some upward lift to slow the fall (i.e. autorotation).
Impressive engineering. I like the way you make changes on the fly. A hoover craft is the most difficult heavier that air machine to fly. Wishing you great success.
I love the way you work: a combination of trial and error, theoretical/aerodynamical insights. and methodical testing! I have not watched all your videos since the beginning, and maybe you already tested this, but based on my own experience this type of flying rotors are very sensitive to the position of the CG along the vertical axis. Contrary to intuition , a CG above the rotor increases stability. So moving your battery higher up (or doing a test with the extra disc weight mounted higher) may be worth trying, if you did not already ;-)
If you just get stuck in math only the all you are doing is trying to explain the joy someone else had in trial and error and figuring out something new. Hope studying that math is just as fun.
Agree with others regarding variable pitch, but an easy fix would be to add a zero-pitch "washout" at the end of the blades, to keep a portion from stalling.
Love this project, and so glad you cut away the inner portion of the wing surfaces. You have a lot of twist on the wings, looks like a typical propeller profile. BUT a typical propeller has a high ratio of axial to angular airflow velocity, to the angle of incidence is approximately constant across the disc radius. In your application, angular velocity is low, for sure but axial is almost zero. So shouldn't the wings have almost no twist? As shown from the tufting, the inner third(?) was almost entirely in stall, adding no lift and only drag. With a more constant pitch from blade root to tip you could keep the inner portion of the wings surfaced, reduce the inner tip vortices and keep the aesthetic you want. Good to see there is some redundancy (one engine out) and really looking forward to the next tests!!
That's pretty much what I was thinking, all along. I was glad to see him remove the covering on the inner quarter, but even the next quarter is at a pretty high pitch, for no good reason I can think of. Since vertical speed is always pretty low, it seems like it ought to be constant pitch for the whole span.
timi, I think I get what your saying. Do you mean locate the props in FRONT of the leading edges about 6 inches from the end of the wing ?? And angling them up just Right at the bottom of that axel !!!a few degrees. amazingdiyprojects Thought about adding any of the weights UNDER the motor ??
Great fun! Suggestion 1: place a closed circle on top, non turning, from center to 1/3 of the rotor. Do you know if the air during flight wants to go up or down in the center of your craft? If up then the circle can add lift.
Two coaxial single wings would be a very interesting idea as well. Also powered from the center using big diameter outrunners or similar. Should be scary quiet and efficient. (And a big challenge to get balanced and functional.)
I like this idea as a possible way to enable true VTOL for an autogiro. A pair of crossed teeter heads (K.I.S.S) with tip motors and folding props. Take off like this and transition to forward flight using a conventional prop. Once full autorotation is achieved the tip motors can be turned off and the props fold to reduce drag.
Moving your mass to the bottom of the craft would make the loading much more stable. You have an easier time setting it down because it pivots and pendulums from the point of most weight. When you install your weights on top you put the weight very high up. On Rockets this is the opposite. They want the mass lower to allow it fly it straight up which might be a benefit for you.
your best bet for tip speed increase is a decrease in AOA of the main rotor fuselage. its a bit unintuitive but the power consumed is proportial to AOA so you should attempt minimize this and hunt for the lowest AOA that requires no flap input/ collective to hover/ take off... at which point you may have to iterate on tip props since they will be going much faster and may no longer be optimal... curious to see how much authority loss is experianced due to the props getting their advance angle messed with as it precesses during sideways/ forward flight...
Did you ever have breaking propellers in flight? I'am asking for a reason. When i played around with a McCutchen Charybdis (same principle) it broke a lot of props in the beginning. This could only be stopped by using very rigid props. The whole system turns around its axis. The props turn as well, but 90 degrees angled. Now think about props. During one prop rotation there are two points, where blades are in perfect up/down position. But a quarter of a turn later one blade is orientated to the inside and one to the outside of the system. Because the whole system is turning, this means the outer blade is further away from the systems turning point creating more force than the inner blade. This happens as well twice during one prop rotation. In my case this imbalance leaded to a lot of bending the props and finally breaking them. Something to think about for safety reasons. 🙂 Otherwise, great job. I really like your work.
I think, the inner part of the rotor area causes not very much lift compared to air resistance. So I would suggest to use only the outer part of the rotor with air foils. In this way you can also try to simplify the shape. I have also seen a lot of radial air flow. So probably wing lets can keep more air flow more in tangential direction to generate more lift and less resistance. I have recently seen this mean also on rotors of wind energy converters.
You seriously could market this as a wireless outdoor ceiling fan, and include station-keeping and follow-me modes. It would probably be popular with slow-moving outdoor activities such as golf.
Cool vehicle, I think for Improvement of flow on control surface action, they need to have the length of the whole wing/blend in better with inner wing, otherwise the corner creates turbulence where lift may be cut off
Interesting craft, but given that lift seems to be optimized around the airfoil angle of attack rather than camber - it may have some issues in that it'll auto-rotate like a brick. So it'll not do too well on a full power loss to the motors. I guess there's always some trade-offs to be made when choosing certain design parameters.
There has GOT to be a solution for the forward motion problem, and I think the key may be in what you got when you tested it with one motor out. It wobbled, not because the weight was off-balance (it wasn't, since you had the same motors in the same places), but because the THRUST was out of balance. That is, there was a cyclic thrust that was changing direction at a 1 Hz rate. Now, if you just turned off power to the motor that was facing away from the direction you want to move, then this wouldn't be cyclic; it would just be an off-axis thrust. Yes, it might do the same thing that mounting another motor & propeller above the rotor did, but that was also introducing an undesirable pitch moment.
It looks like the last flight was the most maneuverable of them all. i was betting on it having the ability to lift a load into the sky. Im still sourcing parts . Since you have the ability to strip of the tape easily. Trying different airfoils on the aluminum frame wing might yield even better result. airfoils like low speed ULM, blackbird, turbine blade, dolphin flipper, etc,etc. good luck
You need to lessen the pitch on your main rotor if you want more rotational speed with the same amount of lift at hover. Your rotor has such high angle of attack, as you slow to decend it ends up stalling or losing control just like a airplane wing at high angle of attack and slow speed. Lower that rotor angle by about half and use the airfoil leading edge.
This reminds me nostalgically of Carl Sagan's "floaters" as alien life forms on giant gas planets. Who knows? NASA may be interested in this project as a way to deploy probes high in the atmospheric layers of one of the moons of Jupiter or Saturn, using flexible panels of solar cells as material for the propellers. Anyway, Congrats for that!
love it... i'm imagining a bigger version maybe using inflatable wings filled with helium because why not... also wondering about electrifying the leading and trailing edges of the wings to get an electrodynamic ion drive like the little electric lifter craft people make... i wonder if it could work without the little propellers on the wingtips just from ion drive?...
This is fascinating. I teach an aeronautics STEAM class and I’ve been showing my students your various videos. They’re fascinated by your work. Can you explain why this craft stalls as you descend? If it loses power, can it autogyro down? Thank you for sharing your work and inspiring so many of my students.
The blades are fixed pitch wings, they use elvons on the back of each wing. As it begins to fall the rotation of the wings slows down, and it picks up speed going down. Meaning less air hitng the wing head on and more air hitting it from bellow. The angle of attack increases a great amount as it starts slowing down. Just think of one wing as a your common airplane that trying to maintain a constant pitch and altitude and adjusting altitude with speed.
I love your projects, I think they are amazing , but I would lie if I said I loved watching all 36min of this. I think you should consider creating a second channel with the long video's for those who want to see it all, and maybe some shorter summarized updates that could also draw in a wider audience? Just a suggestion.
If possible, reduce the wing incidence to descend? I wonder if there's a way to make the wing pitch (as another commented below) depend on rotation speed without adding too much weight or complicating the design.
What would happen if you lost power at high altitude? Will it fall like a stone? Or slowly? Can you still make auto-rotation to save it and make a landing ?
I wonder if because of the angle of attack of the center portion of your rotor it's acting more like a paddle than a rotor. It's trying to push the air toward the outside of the rotor before being pushed down. Removing it allow more directly without the air being pushed out then down. ? Just a thought.
A counter rotation version would be good, but quieter they are not! The 2nd rotor slaps into the propwash of the first and this causes the extra noise.
@@fabianbohnert120 Yes, but then it's a question of practicality, less noise, more spacing = less desirable form factor. Consider that wind turbines are spaced hundreds or even thousands of meters away to avoid turbulence, although this is not so much to reduce noise, but to reduce mechanical stress on the downstream blades. Turbulent propeller washes don't fade quickly - think of how far a vortex cannon can project a ring, or the tip wakes of Jumbo jets...
Some thoughts… - How would it be to replace those aluminium rods with carbon fibre rods? They don't cost so much these days. - Variable pitch on the wings would be interesting, but probabaly complicated. And where is this? Sounds like Sweden by your friend's speak in the background ;)
This is why if you see my previous comment on your last video. Add flaps that are controlled to open them in those gaps when you need control for vertical decent or controlled movement. Then close them when you need to hover or lift weight.
You would have a better flight feel by changing your 6-way servo commutation into a continuously calculated cyclic value for each servo. Like az*sin(a)+el*cos(a) for each servo. I offered my collab 4 free, and im sure others would too. We just need the spec how angle signal and how az and el signals look. PPMSUM would be OK, separate pwm would be OK, serial data would be OK. You would get preprogrammed arduino plus opensource code.
what if you used the control flaps to. be spoilers to reduce lift without reducing tip speed during decent. i spoke too soon you seemed to sort it with the lower angle of attack
May I ask what is your end goal with this idea? Or are you simply experimenting for the quest of knowledge? I'm really enjoying the process, thank you for sharing! Very mesmerizing to watch the slow speed and gentle flight characteristics of your machine.
Im in the "simply experimenting for the quest of knowledge" category. That being said, every project is sprung out of and draws energy from a vision. The vision for this project is something like a flying RV (recreational vehicle) with a sci-fi-poetic-nature-loving-flavor. :-D
I'll be your guinea pig. I want to go for a ride. jay the Florida pool pump motor repair guy when service calls Longwood approved ! that was good info 2 know/see 👨🔧amazingdiyprojects😁
The motors thrust line are perfectly horizontal with the wing at 12.5 degrees. The wings are currently at 9.5, so the motors are unintentionally pointing 3 degrees down relative the horizon.
Is there any reason why u don't use 2 counter rotating set of blades with the main motor between the two and then have horizontal mini drone motors for control?
🎉 immer wieder tauchen technische Wunderkonstruktionen auf. Das einzige Wunder ist, dass es naive Menschen gibt, die an diesem Wunder glauben ohne die Hintergründe zu erfassen
1:03 my guess is not a static balance problem, but rather a asymmetrical thrust issue. The thrust of the two motors are trying pull away from the dead motor. 7:38 have you thought turbulators, or stall fences? 14:06 not funny it's very cool! 23:00 did you keep the pitch at 9.5?
1:03 -Ah, interesting thought! 7:38 -always looking for the simplest, lowest part count concept possible, design but turbulators might buy their way on to the craft, I might try it out. 14:06 -🙂 23:00- the upper and lower bracing wires holds the wings firmly at their set angle of attack.
@@amazingdiyprojects earlier in the video you changed the pitch from 12.5 to 9.5. I was asking if you kept at 9.5 when removed the covering off. If is at 9.5 will the wobble behavior return at 12.5 when descending.
@@patrickradcliffe3837 Ah, yes still at 9.5. I don't know, but a higher angle of attack brings the system closer to stall, so probably more wobble on descent at 12.5 even with the inner wing surface cutaways.
@@knicklicht7945 that could be said, but now it will have more reserve power in reserve to combat any wind should there be any. But in the mean time, it is getting better efficiency and power not being wasted just for lift.
I think this helicraft can use for environmental monitoring and research purposes. I want to make one for my remote sensing projects. can you give me all the details for making this helicraft? Give me the Github URL will do, thank you in advance.
lower the center of gravity below the center of lift, if possible. this is a very intriguing project. Da Vinci is a hack. your imagination and your engineering ability far surpasses..
How critical are the cables above and below the wings to the center shaft? I ask because without them you could consider a counter rotating prop, possible gear driven to exactly match the rotation of the first prop. If you drive the props independently you could conceivably control rotation orientation of the craft itself by slowing down or speeding up one prop, like the original Hiller flying platform.
The wires are critical in this low weight low cost version. You might do without wires if built with carbon fibre. The wires interconnecting the wings are a part of the failsafe design allowing for two motors to propel the wing with the faulty motor.
@@amazingdiyprojects couldn't you bend the wings donward a bit and connect the tips of the wings with wire. If the wings want to bend up the would have to stretch the string. Then the reinforcement would only be in the plane of the propeller.
![เปิด อาณาจักร หมื่นล้าน "สาระตั้ม" l [Nickynachat]](http://i.ytimg.com/vi/3XE0nPF4YkQ/mqdefault.jpg)
![เจ็บที่ยังฮัก - ม่อน วรวิทย์ [ Official Mv ] จอนนี่มิวสิค](http://i.ytimg.com/vi/KALIGSRSjFs/mqdefault.jpg)
When I see this odd thing flying, I can't avoid thinking about the early days of aviation
Leonardo would approve and then design bombs for it to drop.🤗
@@michaelrussell5346 it the rotating speed or the lack of speed it's as with a regular fly things rotor, not moving at at,?
I can only see the future of aviation!
Very glad you're going so deep into this project! I love thinking about the possible applications
Im just having the best of time investigating the dynamics of this craft and happy to share my findings with other fellow aviation enthusiasts!
Dreaming of a flying RV /camper at the moment and trying to imagine how a mini stove made out of 0.1mm stainless steel might look like....LOL
This has been a fascinating project so far. I really enjoy watching the progress and testing. So graceful. I appreciate your knowledge and design skills. Thank you for showing us. 👍👍
There’s something so calming about this rig
Very interesting craft you have built, I enjoy watching the vids of your test flights. Thank you.
The take-away for me is that the wings have to fly well above stall speed for hovering to allow headroom (footroom?) to descend without stalling!
Two points that I want to make:
Helicopters run their propeller at constant speed and only change the collective pitch, in order to be able to descend without introducing stall.
In the first tufting test, you can see that the air on the inner parts of the wing is being blown towards the wing tips (along the wing) more than it is being blown across the wing.
The lack of efficiency decrease is probably due to the fact that the inner portions were pretty much pushing flat into the wind, creating a lot of drag and little lift. Removing the fabric removes that drag, but replaces it with vortex drag so no efficiency increase either. Better to reduce the twist so the inner portion has a reasonable angle of attack. Also could add full width ribs on the inner section to give the top side a lot of curvature, allowing higher AOA before stall.
Regarding the descent stall problem, I don't think it can be solved without turning it into an ordinary tip jet helicopter. You need variable pitch so you can tilt the lift vector forward, turning that upward airflow into acceleration of the rotor RPM and some upward lift to slow the fall (i.e. autorotation).
Dekutree64
Like this?
th-cam.com/video/7JH1_ZKV7t4/w-d-xo.html
Impressive engineering. I like the way you make changes on the fly.
A hoover craft is the most difficult heavier that air machine to fly. Wishing you great success.
I love the way you work: a combination of trial and error, theoretical/aerodynamical insights. and methodical testing! I have not watched all your videos since the beginning, and maybe you already tested this, but based on my own experience this type of flying rotors are very sensitive to the position of the CG along the vertical axis. Contrary to intuition , a CG above the rotor increases stability. So moving your battery higher up (or doing a test with the extra disc weight mounted higher) may be worth trying, if you did not already ;-)
If you just get stuck in math only the all you are doing is trying to explain the joy someone else had in trial and error and figuring out something new. Hope studying that math is just as fun.
Man, I love your project! Man wouldn't be your "flying wing" be great for Ion propulsion?! I'm really curious about how that would work out!
Agree with others regarding variable pitch, but an easy fix would be to add a zero-pitch "washout" at the end of the blades, to keep a portion from stalling.
Very cool project. I want one!
Love this project, and so glad you cut away the inner portion of the wing surfaces. You have a lot of twist on the wings, looks like a typical propeller profile. BUT a typical propeller has a high ratio of axial to angular airflow velocity, to the angle of incidence is approximately constant across the disc radius. In your application, angular velocity is low, for sure but axial is almost zero. So shouldn't the wings have almost no twist? As shown from the tufting, the inner third(?) was almost entirely in stall, adding no lift and only drag. With a more constant pitch from blade root to tip you could keep the inner portion of the wings surfaced, reduce the inner tip vortices and keep the aesthetic you want. Good to see there is some redundancy (one engine out) and really looking forward to the next tests!!
That's pretty much what I was thinking, all along. I was glad to see him remove the covering on the inner quarter, but even the next quarter is at a pretty high pitch, for no good reason I can think of. Since vertical speed is always pretty low, it seems like it ought to be constant pitch for the whole span.
Such an elegant machine :)
Very nice, fascinating to watch! Thanks for posting!
wondering if you might gain a few points by more optimally locating the tip propellers, to align more closely with the rotor's trailing vortex
timi,
I think I get what your saying. Do you mean locate the props in FRONT
of the leading edges about 6 inches from the end of the wing ??
And angling them up just
Right at the bottom of that axel !!!a few degrees.
amazingdiyprojects
Thought about adding any of the weights UNDER the motor ??
Great fun! Suggestion 1: place a closed circle on top, non turning, from center to 1/3 of the rotor. Do you know if the air during flight wants to go up or down in the center of your craft? If up then the circle can add lift.
If you made that circle out of louvers that could open/close, you could make your 'descent assist' device not effect your rate of climb.
Ditch the elevator flaps for a collective pitch head unit, remake your blades accordingly.
Amazing job! Next Goal - Make some Clear Pictures of BigFoot on the Woods with this IFO!
Two coaxial single wings would be a very interesting idea as well. Also powered from the center using big diameter outrunners or similar. Should be scary quiet and efficient. (And a big challenge to get balanced and functional.)
I like this idea as a possible way to enable true VTOL for an autogiro. A pair of crossed teeter heads (K.I.S.S) with tip motors and folding props. Take off like this and transition to forward flight using a conventional prop. Once full autorotation is achieved the tip motors can be turned off and the props fold to reduce drag.
Moving your mass to the bottom of the craft would make the loading much more stable. You have an easier time setting it down because it pivots and pendulums from the point of most weight. When you install your weights on top you put the weight very high up. On Rockets this is the opposite. They want the mass lower to allow it fly it straight up which might be a benefit for you.
your best bet for tip speed increase is a decrease in AOA of the main rotor fuselage. its a bit unintuitive but the power consumed is proportial to AOA so you should attempt minimize this and hunt for the lowest AOA that requires no flap input/ collective to hover/ take off... at which point you may have to iterate on tip props since they will be going much faster and may no longer be optimal... curious to see how much authority loss is experianced due to the props getting their advance angle messed with as it precesses during sideways/ forward flight...
What if you move the tip motors a little in board to create wash over the control surfaces?
Thanks for your input, good thinking. I might try that out, or perhaps add a control surface on the motor mount tube?
I would like to see a single blade version like the sycamore seed, very efficient.
Great idea
Did you ever have breaking propellers in flight?
I'am asking for a reason. When i played around with a McCutchen Charybdis (same principle) it broke a lot of props in the beginning. This could only be stopped by using very rigid props.
The whole system turns around its axis. The props turn as well, but 90 degrees angled.
Now think about props. During one prop rotation there are two points, where blades are in perfect up/down position. But a quarter of a turn later one blade is orientated to the inside and one to the outside of the system. Because the whole system is turning, this means the outer blade is further away from the systems turning point creating more force than the inner blade. This happens as well twice during one prop rotation. In my case this imbalance leaded to a lot of bending the props and finally breaking them. Something to think about for safety reasons. 🙂
Otherwise, great job. I really like your work.
I think, the inner part of the rotor area causes not very much lift compared to air resistance. So I would suggest to use only the outer part of the rotor with air foils. In this way you can also try to simplify the shape. I have also seen a lot of radial air flow. So probably wing lets can keep more air flow more in tangential direction to generate more lift and less resistance. I have recently seen this mean also on rotors of wind energy converters.
You seriously could market this as a wireless outdoor ceiling fan, and include station-keeping and follow-me modes. It would probably be popular with slow-moving outdoor activities such as golf.
Cool vehicle, I think for Improvement of flow on control surface action, they need to have the length of the whole wing/blend in better with inner wing, otherwise the corner creates turbulence where lift may be cut off
Interesting craft, but given that lift seems to be optimized around the airfoil angle of attack rather than camber - it may have some issues in that it'll auto-rotate like a brick. So it'll not do too well on a full power loss to the motors. I guess there's always some trade-offs to be made when choosing certain design parameters.
Efficiency of this device is huge. Maybe is time for manned helicopter on this concept.
There has GOT to be a solution for the forward motion problem, and I think the key may be in what you got when you tested it with one motor out. It wobbled, not because the weight was off-balance (it wasn't, since you had the same motors in the same places), but because the THRUST was out of balance. That is, there was a cyclic thrust that was changing direction at a 1 Hz rate. Now, if you just turned off power to the motor that was facing away from the direction you want to move, then this wouldn't be cyclic; it would just be an off-axis thrust. Yes, it might do the same thing that mounting another motor & propeller above the rotor did, but that was also introducing an undesirable pitch moment.
It looks like the last flight was the most maneuverable of them all. i was betting on it having the ability to lift a load into the sky. Im still sourcing parts .
Since you have the ability to strip of the tape easily. Trying different airfoils on the aluminum frame wing might yield even better result. airfoils like low speed ULM, blackbird, turbine blade, dolphin flipper, etc,etc. good luck
Awesome project 👌
Nice to meet you. Your video is very interesting. i like it. Have a nice day, good luck, I will watch your video
You need to lessen the pitch on your main rotor if you want more rotational speed with the same amount of lift at hover. Your rotor has such high angle of attack, as you slow to decend it ends up stalling or losing control just like a airplane wing at high angle of attack and slow speed. Lower that rotor angle by about half and use the airfoil leading edge.
This reminds me nostalgically of Carl Sagan's "floaters" as alien life forms on giant gas planets.
Who knows? NASA may be interested in this project as a way to deploy probes high in the atmospheric layers of one of the moons of Jupiter or Saturn, using flexible panels of solar cells as material for the propellers. Anyway, Congrats for that!
love it... i'm imagining a bigger version maybe using inflatable wings filled with helium because why not... also wondering about electrifying the leading and trailing edges of the wings to get an electrodynamic ion drive like the little electric lifter craft people make... i wonder if it could work without the little propellers on the wingtips just from ion drive?...
If dragonflies were rotary instead of reciprocal
Interesting video as always.
Tack!
This is fascinating. I teach an aeronautics STEAM class and I’ve been showing my students your various videos. They’re fascinated by your work.
Can you explain why this craft stalls as you descend? If it loses power, can it autogyro down?
Thank you for sharing your work and inspiring so many of my students.
The blades are fixed pitch wings, they use elvons on the back of each wing. As it begins to fall the rotation of the wings slows down, and it picks up speed going down. Meaning less air hitng the wing head on and more air hitting it from bellow. The angle of attack increases a great amount as it starts slowing down. Just think of one wing as a your common airplane that trying to maintain a constant pitch and altitude and adjusting altitude with speed.
This basically a flying propeller. It looks like it has no engine and space for a battery. Like 20 years ago this would be magic
If you had a balloon platform and a rope this would be great for bringing loads up to the balloon up a rope.
I love your projects, I think they are amazing , but I would lie if I said I loved watching all 36min of this. I think you should consider creating a second channel with the long video's for those who want to see it all, and maybe some shorter summarized updates that could also draw in a wider audience? Just a suggestion.
I want to see your 3d printer setup!
Thank goodness that you explained how the centre rotation yaw motor works.. I thought it was all CGI😅
Is that a motor in the center shaft? the efficiency of this must be bonkers.
What would happend if you used coaxial rotors?
Good job
If the wings are filled with hydrogen, then the wings themselves can counteract some of the gravity, which is more efficient
If possible, reduce the wing incidence to descend? I wonder if there's a way to make the wing pitch (as another commented below) depend on rotation speed without adding too much weight or complicating the design.
Hmm, variable pitch ?
At that point you're recreating the swash plate on a traditional helicopter design.
@@pauljs75 No swashplate needed, as unlike a helicopter, all three blades on this aircraft have the same pitch, if I'm not mistaken?
The hand-launched toy version of this dangles a weight to keep its stability. Will that work here?
What would happen if you lost power at high altitude? Will it fall like a stone? Or slowly? Can you still make auto-rotation to save it and make a landing ?
Maybe land safely like a gyroplane
Glad you cut out the inner wing foils. How about reducing the wing angle from 9 to 6? More wing lift, less thrust, imho. Just asking.
I’m surprised that your weights are not lower down which would improve stability
I wonder if because of the angle of attack of the center portion of your rotor it's acting more like a paddle than a rotor. It's trying to push the air toward the outside of the rotor before being pushed down. Removing it allow more directly without the air being pushed out then down. ? Just a thought.
モーターが、付いていました。動く原理が理解できました。
A counter rotation version without tip motors would be nice. very silent, I think. Anyway, just an idea. Great project, thanks or sharing
A counter rotation version would be good, but quieter they are not! The 2nd rotor slaps into the propwash of the first and this causes the extra noise.
@@ahaveland couldn't you reduce that by having some distance between the propellers?
@@fabianbohnert120 Yes, but then it's a question of practicality, less noise, more spacing = less desirable form factor.
Consider that wind turbines are spaced hundreds or even thousands of meters away to avoid turbulence, although this is not so much to reduce noise, but to reduce mechanical stress on the downstream blades.
Turbulent propeller washes don't fade quickly - think of how far a vortex cannon can project a ring, or the tip wakes of Jumbo jets...
Some thoughts…
- How would it be to replace those aluminium rods with carbon fibre rods? They don't cost so much these days.
- Variable pitch on the wings would be interesting, but probabaly complicated.
And where is this? Sounds like Sweden by your friend's speak in the background ;)
21:20 the opposite of leading in this context, I think would be trailing (instead of lagging).
This is why if you see my previous comment on your last video. Add flaps that are controlled to open them in those gaps when you need control for vertical decent or controlled movement. Then close them when you need to hover or lift weight.
Add a flap that is rotated in the center of the flap so it opens up on both sides.
Intriguing idea!
I think it should be mentioned how fortunate the world is that you did not decide to become a supervillain.
:-D
Have you checked out the recent videos by Nicholas Rehm? Similar concept and both are very cool
go look at the latest Killingburg wing youtube . It shows how to keep the air attached to the upper surface.
a flying ceiling Fan Kool
You would have a better flight feel by changing your 6-way servo commutation into a continuously calculated cyclic value for each servo. Like az*sin(a)+el*cos(a) for each servo. I offered my collab 4 free, and im sure others would too.
We just need the spec how angle signal and how az and el signals look. PPMSUM would be OK, separate pwm would be OK, serial data would be OK. You would get preprogrammed arduino plus opensource code.
Might pick you up on that offer eventually, thanks!
For now Im still trying to expand the basic flight envelope and hammer out smaller kinks.
Can you make a video of how to make the craft
Had you thought about using winglets between the motor and wingtip?
Are you perhaps planning a shift to a four wing, two spar design?
what if you used the control flaps to. be spoilers to reduce lift without reducing tip speed during decent. i spoke too soon you seemed to sort it with the lower angle of attack
Thinking of possible uses
Would not the weights be better at the bottom of the centre shaft, for stability?
May I ask what is your end goal with this idea? Or are you simply experimenting for the quest of knowledge? I'm really enjoying the process, thank you for sharing! Very mesmerizing to watch the slow speed and gentle flight characteristics of your machine.
Im in the "simply experimenting for the quest of knowledge" category. That being said, every project is sprung out of and draws energy from a vision. The vision for this project is something like a flying RV (recreational vehicle) with a sci-fi-poetic-nature-loving-flavor. :-D
THAT'S COOL !!!!!!
I want one!
I'll be your guinea pig. I want to go for a ride. jay the Florida pool pump motor repair guy when service calls Longwood approved ! that was good info 2 know/see 👨🔧amazingdiyprojects😁
Awesome 👍
Put the extra weight on the landing gear for auto stabilisation in flight.
Doesn’t work like that. You can get a “pendulum” effect which seriously upsets stability.
It's utterly infuriating when I see the wings spinning the wrong way no matter what I tell my brain I should be seeing. :)
I wonder how large snd efficient it can get.
Butterfly-valve type "flap" the inner 1/3.
what is the angle of attack for the motor relative to the wing?
The motors thrust line are perfectly horizontal with the wing at 12.5 degrees. The wings are currently at 9.5, so the motors are unintentionally pointing 3 degrees down relative the horizon.
can you make a 5 prop ?
Is there any reason why u don't use 2 counter rotating set of blades with the main motor between the two and then have horizontal mini drone motors for control?
🎉 immer wieder tauchen technische Wunderkonstruktionen auf. Das einzige Wunder ist, dass es naive Menschen gibt, die an diesem Wunder glauben ohne die Hintergründe zu erfassen
1:03 my guess is not a static balance problem, but rather a asymmetrical thrust issue. The thrust of the two motors are trying pull away from the dead motor.
7:38 have you thought turbulators, or stall fences?
14:06 not funny it's very cool!
23:00 did you keep the pitch at 9.5?
1:03 -Ah, interesting thought!
7:38 -always looking for the simplest, lowest part count concept possible, design but turbulators might buy their way on to the craft, I might try it out.
14:06 -🙂
23:00- the upper and lower bracing wires holds the wings firmly at their set angle of attack.
@@amazingdiyprojects earlier in the video you changed the pitch from 12.5 to 9.5. I was asking if you kept at 9.5 when removed the covering off. If is at 9.5 will the wobble behavior return at 12.5 when descending.
@@patrickradcliffe3837 Ah, yes still at 9.5. I don't know, but a higher angle of attack brings the system closer to stall, so probably more wobble on descent at 12.5 even with the inner wing surface cutaways.
Tieing a helium balloon 🎈 to the center on top with long string with give longer battery life and more stability.
Makes it even more sensitive to wind.
@@knicklicht7945 that could be said, but now it will have more reserve power in reserve to combat any wind should there be any. But in the mean time, it is getting better efficiency and power not being wasted just for lift.
never to be seen again, lol
@@manifold1476 only a slight amount of lifting to remove some of the load from the motors but not enough to lift completely off the ground...
I think this helicraft can use for environmental monitoring and research purposes. I want to make one for my remote sensing projects. can you give me all the details for making this helicraft? Give me the Github URL will do, thank you in advance.
lower the center of gravity below the center of lift, if possible. this is a very intriguing project. Da Vinci is a hack. your imagination and your engineering ability far surpasses..
How critical are the cables above and below the wings to the center shaft? I ask because without them you could consider a counter rotating prop, possible gear driven to exactly match the rotation of the first prop.
If you drive the props independently you could conceivably control rotation orientation of the craft itself by slowing down or speeding up one prop, like the original Hiller flying platform.
The wires are critical in this low weight low cost version. You might do without wires if built with carbon fibre. The wires interconnecting the wings are a part of the failsafe design allowing for two motors to propel the wing with the faulty motor.
@@amazingdiyprojects couldn't you bend the wings donward a bit and connect the tips of the wings with wire. If the wings want to bend up the would have to stretch the string. Then the reinforcement would only be in the plane of the propeller.
@@amazingdiyprojects so inspiring to watch and imagine what can be!!! Keep going and thanks for the adventure!
Unbelievable.
Does it have a swash plate like a Helicopter?or are those ailerons electronically timed?
It has a electro-mechanic commutator for the FC-servo signals, so sort of a swash plate.
since rotation speed is low would 4 or 6 blades provide greater load lift?
Yes, but they will also create un-proportionally higher drag if not designed differently unfortunately so efficiency will go down.
What is the efficiency of this vs a quadcopter of similar weight? (or, probably better metric: similar lifting capacity)
He measured this as 16 g/W in hover which is close to an order of magnitude greater than your average quad.
add adjustable helicopter wing rotor angles to control direction stability
or just gyro acceleration wheels, gyro direction control
or just adjust the tip-jet rotors speed/angle to control the direction
you can make a hat propeller to fly with
or just a flying chair helicopter, the chair being under the rotor
the wings rotors could be totally flexible
DIY,
I think this model definitely has a SpaceX (Mars) potential. Call Elon. . .or Gwynne Shotwell, his COO. Direct them to see this video.
動力がどのように供給されてるかわかりません。不思議ですね。
40 000 км. в тропосферу !!!
Har du sett denna? Väldigt lik din design. Kanske kan ni båda dra nytta av varandras insikter. th-cam.com/video/I3D559DNa04/w-d-xo.html