You could try turning the left propeller clockwise and the right propeller counterclockwise. This creates an air cushion behind the boat and could increase the efficiency a little.
@@vedanshgupta4711 I suspect it's because: the majority of the propeller's thrust vector is backwards, but there's a horizontal component also, based on the rotation direction of the propeller - that's what causes the boat to spin with only one propeller. The way they're arranged now, the horizontal components point outwards to the sides of the boat. If the rotations were flipped, the thrust vectors would point inwards, towards each other, and cause the propelled air to collide, creating an area of higher pressure behind the boat. I don't know enough about fluid dynamics to know if that would actually be beneficial, but I can see how it could be. It's also conceivable that would just create turbulence in the air flow path and end up slowing the propellers down. I'm not sure.
@@kaelananderson9237 There's going to be air going "out" in all (radial) directions from the propeller. I don't think the up/down components should matter too much, but there might be some merit to changing which direction it throws the air out at the bottom (near the hull and water), thought I'm also certainly no fluid dynamics expert.
1. I suppose it could lead to some loss of thrust 2. steering could be affected by quite a margin 3. imagine a Learjet 45, which can only be controlled by controlling the amount of thrust, given that the outlets of engines are pointed Inwards. you could Imagine the steering problems. Please let me know if I'm wrong.
@@kaelananderson9237 Thanks for the quick reply. Is it possible if the spinning of the motors themselves create the effect? Instead of the dynamics of the air?
You should put a vertical stabiliser on it, underwater one like a rudder. It would be more stable in a yaw axis and you wouldn't have to do so much inputs keeping is straight.
@@fluffigverbimmelt Yeah the whole advantage of an airboat is minimizing draft and below-waterline moving parts for operation in shallow and/or obstructed waters, any keel or rudder deep enough to make a difference at this scale and you might as well just have a conventional underwater prop...
This reminds me of the airboats used in Louisiana and Florida. The difference is it's one fan and the steering is done by putting a rudder on the back of the fan instead of the water. They are flat bottomed, shallow draft boats, as they're used in swampy, boggy areas, like the Florida Everglades.
@@faulix00 I know that. Never said this boat had one. But airboats do have a rudder. Usually a boat has a rudder in the water, but airboats have an "aircraft style" rudder behind the fan.
You basically have something similar to a hover boat, that "drifts" across the top of the water. A keel will keep it straight and rudders are far more efficient with turning
Imagine you're taking a hike through nature. You get near a river and you see lego boat gliding across. It might be the strangest thing you see that day Edit: Da fuq happened in the replies?
I'd say it all comes down to the task. A submarine is yes, going to be very complicated, but they gave you the ability to survey the waters, and drones can travel longer distances, while the drones are much faster and is able to bypass all terrain by simply flying over them. So you can't really compare boat travel with drones and submarines since they're built for different tasks.
I admire your level of technical knowledge, as always. But what absolutely amazes me is the fact that you were paying attention even during the test drive and did not endanger any water lilies. Hats off, sir.
I think I recognize this river, it connects two lakes and it is only about 300 meters long. Ive caught numerous pike from the southern one, the northern is harder to fish in my experience.
Maybe you should try building a hydrofoil boat next. That would make it travel the fastest. You can build the hydrofoil underwater wings using curved slopes in the shape of an airfoil like you would with an airplanes wing. Since water is much denser than air, you don't need as much lift for the boat's hull to rise out of the water, so you should definitely be able to achieve that with LEGO pieces. en.wikipedia.org/wiki/Hydrofoil Or better yet, a wing-in-ground effect craft! No one's successfully done that yet using LEGO pieces before, so if you achieved that, you would be the first person on TH-cam to do so! :) en.wikipedia.org/wiki/Ground-effect_vehicle
The propellers should rotate not outside the longitudinal axis of the fuselage, but inwards. Ships' propellers rotate "back to back" rather than "away from each other", which makes it easier to sail straight
Far from being a marine engineer but since you got that hull planing you might be able to add a shallow fin in that slot in the bottom of the hull for steering stability and some kind of lifting surface (planing flaps) at the stern to level the boat out; would probably allow you to go faster more of the time!
One LEGO stud (or length of a minifigure foot) is 8 milimeters, or 0.008 meters. That means the fast lego ship's journey of 200 meters would have been 200,000 LEGO feet, or 37.87 LEGO miles. awesome!
I think it needs a better steering than thrust differential. I'd run the motors through a sort of gearset so that both motors power both props. That would eliminate any difference in speed, and provide redundancy in case one of the motors fails. Then steer the boat with a rudder or, better yet, by steering the props. Maybe add a fin to the bottom of the hull.
I think the best hull would be hull d with but with a catamaran configuration, giving it a much more slender shape and a lot of waterline length making it an optimal displacement design
Lego's in the overworld still scares me... They're supposed to stay in my room! Also, i used to have a ideas book for technic lego and it had one of those tall technic minifigures sitting in a zeppelin. I've always wondered if it be possible to make a actual proper zeppelin from lego, with a balloon obviously, that could stay airborne and be controlled with a wireless controller.
It looks like the first few hulls were very nose heavy, which led to swamping. You may want to try working with different centers of gravity on all of them to get a good amount of planing.
Good controlability IMO. Nice water drone. Maybe better than water propelled one? Lets find out what is better, air or water propelled. And try different water propellers too. 😉
1:15 I realized the problem why your boat is spinning around 1 side, because you add more details to make your wings reverse which will increase weight on 1 side, and that's the reason your boat spinning around. To fix this I suggest you should add more details to the other side of your boat to balance your boat's weight
Your vessels may benefit from a keel for stability (lower CG, but also to keep them going straight), I could not see any in the shadow nor direct view.
At 5:39 was that the motors overheating? You are absolutely crushing the concept of engaging Lego STEM! Informative, scientific, fun! Great production. Great post production! I love your work!!
No. The battery is getting below the cutoff voltage of the buwizz, really terrible runtime honestly! Although air boats never were very efficient to begin with
i built air airboat when i was a child with the police boat hull thats slightly smaller than that one, using the 4.5v technics motors i could never get the motor mounted high enough to clear the water but it wasnt so unstable that it just rolled.
You have the propellers only mapped to the sticks? Because having also both in one button helps when trying to go speed in a straight line, instead of only controlling each individually. Also, a protecting cage to prevent damage and jamming.
Re: the many "just add a keel or rudder to straighten the course" comments, anything deep enough to make difference would also defeat the main advantage of an airboat, namely minimizing draft for operation in shallow and obstructed waters (which appears to definitely be a factor in play with the long-distance trial location)...
If you want to make a fast boat, you need to consider stationary thrust AND the speed of the air being pushed backwards. If the air is being pushed back at 5m/s, then the top speed (without air and water resistance) is 5m/s. It may be worth trying to push less air much faster
... Why didn't you make a rudder to stabilize the direction of the boats? This seems like a much more reasonable response than just... ignoring one of the most fundamental parts of a powered water vessel.
I ain't any engineer but just wondering, what if you put a rudder like plate underwater for stabilization🤔 Like planes have above them, similarly for this boat under water for straight line stability.
Can you make a version that uses a single power motor, but uses some kind of differential or something to vary the relative power to each propeller? I dont know if that's even possible (I'm not a mechanical engineer), but I like watching mechanical devices like that.
You could try turning the left propeller clockwise and the right propeller counterclockwise.
This creates an air cushion behind the boat and could increase the efficiency a little.
Why does the turning directions of the props make an air cushion behind the boat?
@@vedanshgupta4711 I suspect it's because: the majority of the propeller's thrust vector is backwards, but there's a horizontal component also, based on the rotation direction of the propeller - that's what causes the boat to spin with only one propeller. The way they're arranged now, the horizontal components point outwards to the sides of the boat. If the rotations were flipped, the thrust vectors would point inwards, towards each other, and cause the propelled air to collide, creating an area of higher pressure behind the boat.
I don't know enough about fluid dynamics to know if that would actually be beneficial, but I can see how it could be. It's also conceivable that would just create turbulence in the air flow path and end up slowing the propellers down. I'm not sure.
@@kaelananderson9237 There's going to be air going "out" in all (radial) directions from the propeller. I don't think the up/down components should matter too much, but there might be some merit to changing which direction it throws the air out at the bottom (near the hull and water), thought I'm also certainly no fluid dynamics expert.
1. I suppose it could lead to some loss of thrust
2. steering could be affected by quite a margin
3. imagine a Learjet 45, which can only be controlled by controlling the amount of thrust, given that the outlets of engines are pointed Inwards. you could Imagine the steering problems.
Please let me know if I'm wrong.
@@kaelananderson9237 Thanks for the quick reply. Is it possible if the spinning of the motors themselves create the effect? Instead of the dynamics of the air?
You should put a vertical stabiliser on it, underwater one like a rudder. It would be more stable in a yaw axis and you wouldn't have to do so much inputs keeping is straight.
And it will give more stability while turning with speed
True, but those also get tangled up in seaweed when using it outside of the pool
@@fluffigverbimmelt Yeah the whole advantage of an airboat is minimizing draft and below-waterline moving parts for operation in shallow and/or obstructed waters, any keel or rudder deep enough to make a difference at this scale and you might as well just have a conventional underwater prop...
At 2:37 I suspect what we can see is an attachment for a centreboard, that would be very handy I guess.
after that submersable, you sure you should be using a game controller?
OOF 😅
Just wait until he starts making a submarine 😅
The game controller was the only thing that worked properly in that thing
@@user-ex6xc5ox3k😭😭
this isn't a madcatz controller
Never miss an upload, best lego channel out there
Brick technology is another fun one I like watching
This reminds me of the airboats used in Louisiana and Florida. The difference is it's one fan and the steering is done by putting a rudder on the back of the fan instead of the water. They are flat bottomed, shallow draft boats, as they're used in swampy, boggy areas, like the Florida Everglades.
They can also move on land in some situations.
This does Not have a rudder in the water. The steering ist completely done by Differential thrust
@@faulix00 I know that. Never said this boat had one.
But airboats do have a rudder. Usually a boat has a rudder in the water, but airboats have an "aircraft style" rudder behind the fan.
Next Lego boat will have a Lego saw to remove the fallen tree in the river.
Lego, chainsaw edition...
@@drewwolfe7462 best comment
A tree has fallen into a river in Lego city, build the chainsaw boat and remove the debris
3:36 “when in doubt, lubricate.” (Mythbusters motto)
A Keel and rudder would help tremendously with the boat veering left and right
You basically have something similar to a hover boat, that "drifts" across the top of the water. A keel will keep it straight and rudders are far more efficient with turning
I like the troubleshooting and experimentation stages of these videos. It's nice to watch things iterate and improve.
Imagine you're taking a hike through nature. You get near a river and you see lego boat gliding across. It might be the strangest thing you see that day
Edit: Da fuq happened in the replies?
There can have been other more strange things
If that was me I'd steal the parts
@@oldhorn420 that's your first thought? Stealing? ... I hope I don't know you IRL
@@JonasThente-ji5xx bro wdym I was joking no way I would steal someone's lego
@@JonasThente-ji5xx also why are you damn sensitive
Much simpler than the submarines or the drone, but a lot easier to maneuver and control. Sometimes the old way are better.
I'd say it all comes down to the task. A submarine is yes, going to be very complicated, but they gave you the ability to survey the waters, and drones can travel longer distances, while the drones are much faster and is able to bypass all terrain by simply flying over them. So you can't really compare boat travel with drones and submarines since they're built for different tasks.
I admire your level of technical knowledge, as always. But what absolutely amazes me is the fact that you were paying attention even during the test drive and did not endanger any water lilies. Hats off, sir.
6:26 Great places for fishing! Are there predatory fish in this river? Have you tried fishing here?
now I'm just imagining him making a working fishing rod with Lego parts.
@@The007lord1 7 Lego Baits vs 7 Real Fish
Only little fishies in Finland. Such small rivers barely hold any large fish.
fishing
I think I recognize this river, it connects two lakes and it is only about 300 meters long. Ive caught numerous pike from the southern one, the northern is harder to fish in my experience.
Perfect illustration of all the design trades required to get a good design!
this man is carrying Lego society rn
I love how he shows the mistakes in detail and fixes them. great video!!
They really need to do another set with that giant cargo ship hull. The original was awesome, wish I hadn't used it for parts as a kid...
Amazing work!
Maybe you should try building a hydrofoil boat next. That would make it travel the fastest. You can build the hydrofoil underwater wings using curved slopes in the shape of an airfoil like you would with an airplanes wing. Since water is much denser than air, you don't need as much lift for the boat's hull to rise out of the water, so you should definitely be able to achieve that with LEGO pieces.
en.wikipedia.org/wiki/Hydrofoil
Or better yet, a wing-in-ground effect craft! No one's successfully done that yet using LEGO pieces before, so if you achieved that, you would be the first person on TH-cam to do so! :)
en.wikipedia.org/wiki/Ground-effect_vehicle
good idea but i think he only want to use only lego :/
The FPV on the creek reminds me of Group B rally footage. Hearing you open the throttle on the long straight was cooler that it should’ve been
At the end of the series, you should do one where you just strap a model rocket motor to a lego hull and stand back.
Very cool experiments with hulls and fan positions! Great to see you using lubrication!
The propellers should rotate not outside the longitudinal axis of the fuselage, but inwards. Ships' propellers rotate "back to back" rather than "away from each other", which makes it easier to sail straight
Waw, it's crazy to reach that much speed on a boat with legos 👍
Concerning the propellers, if you use a lot more blades per prop that are much thinner, it should reduce that vibration and wobble.
Far from being a marine engineer but since you got that hull planing you might be able to add a shallow fin in that slot in the bottom of the hull for steering stability and some kind of lifting surface (planing flaps) at the stern to level the boat out; would probably allow you to go faster more of the time!
One LEGO stud (or length of a minifigure foot) is 8 milimeters, or 0.008 meters. That means the fast lego ship's journey of 200 meters would have been 200,000 LEGO feet, or 37.87 LEGO miles. awesome!
Sounds like a cool engine at 5:38
Yeah! It sounds fantastic!!
Great! Now I can finally defeat that Combine Chopper and make it to Black Mesa East
I think the wobble of the propellers drains a lot of energy. You could try fixating it better to improve the speed.
The biggest hull will always be faster unless you can get the boat on plane. Also to go straight put a rudder in the back, even if it is fixed.
Welcome back, I always expect your great products
I think it needs a better steering than thrust differential. I'd run the motors through a sort of gearset so that both motors power both props. That would eliminate any difference in speed, and provide redundancy in case one of the motors fails. Then steer the boat with a rudder or, better yet, by steering the props. Maybe add a fin to the bottom of the hull.
That was freaking awesome!
This makes me thinking about an oil tanker with airpropellers!
The propellers need to be HUGE! It would be pretty cool.
Salute to the battery powering 2 monstrous buggy motor
Fantastic work as always BEC! Loved watching the journey down the river, great angles!
your videos are so good, i love the way you test the boat on real river, 200m journey, great!
I love these videos but I wish he'd do more submersible ones. I really enjoyed watching those and I'd love to see him try to take one deeper.
I think the best hull would be hull d with but with a catamaran configuration, giving it a much more slender shape and a lot of waterline length making it an optimal displacement design
This is the kind of content I am here for.
Impressive level of detail!
Lego's in the overworld still scares me... They're supposed to stay in my room! Also, i used to have a ideas book for technic lego and it had one of those tall technic minifigures sitting in a zeppelin. I've always wondered if it be possible to make a actual proper zeppelin from lego, with a balloon obviously, that could stay airborne and be controlled with a wireless controller.
Great! Now we can smuggle without being noticed!
Wow a big pool !
I always look forward to your new products; they are incredibly inventive!
This was a lot of fun to watch.
A small keel would probably have helped the boat control better when turning and gliding straight vs veering to the left and right.
I'd consider lowering the motors into the hull and using universal joints to transfer rhe power. Should greatly improve stability.
Having the motors in the front of the hull would also help keeping the hull balanced and reduce drag.
@@LutraLovegood I think having them in the back helps the boat get on a plane.
I think that you should lower the engines position as much as possible giving it a lower center of gravity. I think that would make it more stable.
perhaps a thin rudder and a long fin on the bottom could help stabilize the ship, as of now it tends to slip sideways at every turn
It looks like the first few hulls were very nose heavy, which led to swamping. You may want to try working with different centers of gravity on all of them to get a good amount of planing.
Good controlability IMO. Nice water drone. Maybe better than water propelled one? Lets find out what is better, air or water propelled. And try different water propellers too. 😉
1:15 I realized the problem why your boat is spinning around 1 side, because you add more details to make your wings reverse which will increase weight on 1 side, and that's the reason your boat spinning around. To fix this I suggest you should add more details to the other side of your boat to balance your boat's weight
This inspires me to buy an RC boat and go drive it around the forest rivers
Awesome work 👍👍
i love how it kinda sounds like an RC race car, especially when throttle is at 80% then 100%
Best Lego channel around!
very cool video, and it would be sick to see the same idea with trains too
Your vessels may benefit from a keel for stability (lower CG, but also to keep them going straight), I could not see any in the shadow nor direct view.
At 5:39 was that the motors overheating?
You are absolutely crushing the concept of engaging Lego STEM! Informative, scientific, fun! Great production. Great post production! I love your work!!
No. The battery is getting below the cutoff voltage of the buwizz, really terrible runtime honestly! Although air boats never were very efficient to begin with
Nice Boat
You are testing for static thrust with a weight scale, which is great method for testing tugs but at higher speed it will be different.
i built air airboat when i was a child with the police boat hull thats slightly smaller than that one, using the 4.5v technics motors i could never get the motor mounted high enough to clear the water but it wasnt so unstable that it just rolled.
You have the propellers only mapped to the sticks? Because having also both in one button helps when trying to go speed in a straight line, instead of only controlling each individually.
Also, a protecting cage to prevent damage and jamming.
A keel should help with going straight. Hull F even seems to have a mounting point for it.
Return of the King
Re: the many "just add a keel or rudder to straighten the course" comments, anything deep enough to make difference would also defeat the main advantage of an airboat, namely minimizing draft for operation in shallow and obstructed waters (which appears to definitely be a factor in play with the long-distance trial location)...
Oho. Tuttu silta ja tuttu oja. Represent. :D
you shared such a good video, love it
@6:21 eeeeee bro actually did it, the madman
If you want to make a fast boat, you need to consider stationary thrust AND the speed of the air being pushed backwards. If the air is being pushed back at 5m/s, then the top speed (without air and water resistance) is 5m/s. It may be worth trying to push less air much faster
6:20 through 6:38 played @ x2 speed sounds like an old RX-7 trying to start and run! lol
That was actually good thing
Love your videos! You inspired me to create my channel
Wow insane on board shots! Good videooo
THE KING RETURNS!
You randomly pop in my head, come to find you uploaded 18 minutes ago. Nice
Really really needs a rudder.
I wonder if there's a way to make efficient underwater props and would it be faster with them.
Bro's living my childhood dream
I never really noticed how the Lego steering wheel will rotate when it's being moved due to vibration. Very cute effect
Bro woke up and decided to cook another cool vid
You live in the very beautiful place
I love your videos! They are so well made and just a joy to watch. You should try to make an airplane next!
... Why didn't you make a rudder to stabilize the direction of the boats? This seems like a much more reasonable response than just... ignoring one of the most fundamental parts of a powered water vessel.
Wake up babe my favorite youtuber just posted
I ain't any engineer but just wondering, what if you put a rudder like plate underwater for stabilization🤔
Like planes have above them, similarly for this boat under water for straight line stability.
Fire Adidas Pants 💪🔥🔥
This channel inspired me to make videos about Lego also.. 😀
An underwater fin will help to stabilise the yaw movement .
Why bot have an underwater prop it would be faster right and you could add a keel to have it go straighter would be cool nice vid as always
Can you make a version that uses a single power motor, but uses some kind of differential or something to vary the relative power to each propeller? I dont know if that's even possible (I'm not a mechanical engineer), but I like watching mechanical devices like that.
Differential thrust is cool and all but I wonder how much a rudder would help
The lack of cages around the props are a serious safety risk to your lego captain. Also they cause objects to jam them.
wake up baby, Brick Experiment Channel posted a video
i love this channel ❤️
Seems like you need a better battery with higer discarge rate (the C rate on LIPO battery)
It'd be really cool to see how a hydrofoil compares!
4:12 something about the plastic colour makes it look greenscreened lol
Maybe it will be more stable with motors on the deck and power transfered with some gears or smth to propellers.