Rotary wing testing
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- Опубліковано 28 вер 2024
- Showing some of the testing that has been my spare time occupation in spring/early summer 2020.
The ultimate goal is to build a 2 seat electric VTOL machine that is able to stay up in the air, hovering around, for one hour.
He is still alive, great.
Always wear a bright orange helmet so the first responders will know where to find the head. Kidding, loved your last flying machine. There is one similar to this one that uses small jets at the tips.
His neighbours: "oh god here he goes again, keep the children indoors dear!"
I've heard that a few times....
LOL !!
@@ahmdabdallah5811 what does this have to do with the comment?
He is alive! 👍🏻 And as crazy as ever. 😀
🎵 Those magnificent men in their flying machines....!
Yep; I can see this flying. Love it. What can I suggest.. non-rigid wings maybe? Like the ones surfers use on the beach.
I have thought about it; would be radical, but too inefficient. :-)
You could employ a dragging tail like SailDrone to improve wing stability.
It's actually possible to do a lift off with a single wing (ie a plane) provided that the tow cable is long enough that circular motion gets canceled out. Not so relevant in your case, particularly if trying to manouver under trees.
So glad to see you back on youTube. Watching you fly and then go months without posting I worried you had a crash.
Loving this project. I work on kinda the reverse of this.
If the thought is of any help... I've been able to run my kite turbine backwards e.g drive rotation into my kite turbine, sending rotary power up the tensile shaft to turn the blades.
Having a framework which releases and expands after a set rpm or tension would be cool.
it would be a challenge to get the system balanced, but it sure looks cool operating. Glad to see you back!
What about using a spring or springs, instead of a counter weight?? Just an idea. Awesome video!
Hurry up !! We're all waiting for your next flying thing ;-)
Why are the props not at the end of the wing? So the ropes will let the wings fly further out making it more efficient? This seems like a great idea, you are very clever! And you will have another prop to steer ?
I have a couple of different ideas for controlling this thing but nothing to show at the moment. I will get back on that crucial and interesting topic!
in the smaller indoor test rig at 4:00, the angle makes it hard to tell - but it looks like one wing has fallen back down a little further towards its resting position. That would cause the vibration you see there, which seems to always be the vertical stand bending towards the 'higher' wing.
Interesting. But the setup can’t handle vertical forces! Is’t that a major design fault?
Was that lightning in the background (10.18)?
Incredible Leonardo!
Would a balanced 3 blade, reduce the oscillation?
i enjoy your content
Weld it all together with wings out and walk away ...with a nice sculpture...cause you are smart and you can live longer as a sculptor.
Hi, to cancel oscillation, you should have a self balancing 3 wings system. Remember that any misplaced gramme in this configuration will be multiplied.
Anyway, good project, I look forward to seeing it the sky. ;)
Change the central weight for a spring or elastic to save weight?
Did he say foam board?? Can you get hobby foam board somewhere near Sweden???
It's good to see what you are up to!
Thanks for sharing your project!
What is 4 just spinning
Yes , fantastic! Congratulation
Lift from your device is limited, not very useful as no moments can be supported in something that is in tension only. Wings have Spars for a reason.
Don't agree, I can drive my kite turbine line tension by adding rotation to the transmission from the ground
Question: why did you decide to place the motors so close to the spinning axis? Have experimented with other positions?
well, if you mount it at the root of the blade you need less speed achieved by the motor, and less energy needed to spin the mass of the motors
Reminds me of a young sigkorsky
Cool 👍👍👍👍👍
As seen in Sleeper! ua-cam.com/video/mKRqvOwUsLg/v-deo.html Starts at 2:30. Classic science fiction humor.
there's a video.. in the mix with the title : 'the bizarre behavior of rotating bodies'.. and is called dzhanibekov effect.. just saying
Cool :)
Sorry don't going to wort definitely not with cable or rop
that doesnt look stable enough
I see low powered auto gyro solutions much safer and efficient coming out of this.
why not simply connect the wings with a carbon rod through the center and create a pivot point in the middle of it it can balance on..Then you can use some flaps to position the rotating vehicle, it can take off if it has balast of some kind and maybe even if it hasn't but you have good control..Its basically two connected airplanes flying in a circle, that configurationcan definitely fly without any support
this is never going to work! but nice try :)
Doesn't seem to be lift that is lifting that weight, it is more centrifugal force. The lift is only lifting the weight of the wing itself. I think this design will eventually lead you to using helicopter rotor heads and blades.
Very interesting, I can't wait to see the progress
Me too. One never knows what unknown new discoveries experimentation will bring forth.
@@sailingsolar LMAO xD
I find it very interesting that you're pursuing this type of design. Many years ago, I would dream of a personal "helicopter" with inflatable rotor blades with weights at the tips. The idea that these inflatable blades would be rolled up short for startup, and as rpm increased, gradually let out more and more of the "blade", just like you're doing with your weight / winch. My thought was that a pitot tube at the tip of the rotor would provide pressure to inflate the blade and some sort of control surface at the tip, would control the pitch. Of course, I never worked to develop this, but seeing your latest "adventure" has reminded me of this dream for a portable, compact personal aircraft. FYI, love how organized your room is! Probably contributes to why you are able to accomplish so much (organization).
So, you basically develop ordinary helicopter rotor system.
Most large helicopter designs have fully articulated rotor - there are 3 hinges installed, which allow for 3 degrees of freedom. two hinges - horizontal and vertical - act very close to strings that you use. Things to consider:
*normal helicopter has acceleration about 100g at rotor tips. You need lightweight rotor (usually the blade is only about 1% of helicopter weight). At the same time helicopter blade is very flimsy and works as a sting, so you need very high tension to keep blades close to horizontal, as a result you'll need very high blade tip speed. I've never heard of centrifugal force less than 10 times the weight of rotorcraft (100kg aircraft = 1000kg of force at the root of a blade minimum, 2000 - 2500 - typical value). To achieve that typical helicopter tip speed is about 200m/s.
* string that you want to use has very high aerodynamic drag. You'll have to provide some airfoil cover. This problem matters the less the closer you are to rotor axis (speed is decreased);
* if you want fixed pitch then you can copy autogyro rotor system (as an answer to question "how to do thrust vectoring). Just see the picture, I think it is self-explanatory: i.ytimg.com/vi/7kmbTo2jt9E/maxresdefault.jpg Don't forget about 90 degrees lag;
* one of helicopter design challenges - at parking position blade bends under its weight so blade tip goes down and becomes close to fuselage, typically to helicopter tail. Big helicopters use centrifuginal-activated angle limiters. With strings, I guess, that would be even more of a problem.
... I learned aviation and stuff in Russian, so sorry for language and bad terminology.
One effect that may cause issues with the flight controllers and maybe some vibrations is the “ice skater effect” (not sure about the correct term). When blades flap up or down (in your case both at the same rate and proportional to rpm), the diameter of the rotor disc changes. This causes a change in angular momentum (I think), and thus a speed change. That is why real helicopters have lead/lag hinges.
If I were a rich man I would bring you and joop brocking(drone training youtuber) and Dave Haskins(presciousplastics youtuber) together in one place for one year of working on each others projects. Just three engineer genius' that I see as able to bring solutions as a group. The gathering minds part is my gift in engineering but who's got the money? We need a youtube ceo to make that team happen.
Most low cost MEMS sensors will enter saturation at high loads and give unreliable data from the other axes as well.
Always tinkering. I love it!
Every rotor mounted engine vehicle ever: mounts motors on the rotor tips
amazingdiyprojects: hold my beer
The spinning causes the gyro to actually pull the "down" value outward bringing it partially horizontal. My friend did some experiments with a VTOL rotary wing that converts mid air. I will post the video to that in your comments, so you can check it out. 🤠👍
It can be up or down depending on the sense of the props.
Interesting position for the propulsors. More usually in other experimental helicopter designs, the propulsion unit is situated either at the tip or up to around 1/3 back. One was a pusher design as the blades were meant to feather power off to allow safer less drag autorotation landings. It gets me thinking that in any amount of wind a sort of autogyro hybrid could be configured, where as you would be aware the pressure curve on an aerodynamic profile actually sucks the profile forward. My notion is, if the rotor used propulsors to assist rotation speed (more usually some 350 rpm for effective man portable design) while using airspeed of the vehicle to support the greater lift value, as in a gyroplane. So why would this be of value? Zero wind speed is comparatively rare, and battery charge life would be extended in all other circumstances.
cheers
Great Video. To me it seem like the centrifugal force alone can pull up the weight.
What kind of storage system are you using at 3:25? Need something similar myself. Look forward to seeing more progress of this project as well :)
It feels to me that the motors should be 25% to 30% from the root.
Un savant par exces-lance
Bravo et mille bravo
Awesome idea, looking forward of how stable you might get it! Keep going!
Amazing. Higher efficiency flight is key to so many things. Curious to see your progress.
It seems that your IMU's are maxing out. I believe that they are max rated to something around of 7-8 G's. You would need high G sensor IMU's
Always interesting, thank you for sharing your creative ideas :)
Have you ever thought about an electric helicopter maybe?
The placement of the strings is making the wings go unstable. The aerodynamic forces are roughly centered at about 25% forward but the pivot point set by the strings sit in the center at about 50%. That creates an unstable pitching moment that get worse with the square of the speed. You'll get more stability by moving the aft spring forward to the 45%-50% point. I'm curious what the results might be.
You might consider a spring or elastic retractor to either assist or replace the green bucket. The bucket is a set value; eventually being cancelled out. A spring will add a varible tension that will increase with rpm. Currently, when the centrifugal force overcomes the bucket, the wings get to do what they want. You can use this characteristic in the design or design to control it.
Good luck!
Im working on a R/C controlled winch system based on a cordless screw driver motor/gearbox!
Creativity must be utilized but I fear that you are in retrograde. Your flying chair has not reached its full potential.... So much more to learn and utilize there. The tilting lift generating wing had not been embraced along with solar charging.
You should research the Kaman Seasprite system because it's similar in concept, and very interesting ..
This seems to me a propeller testing not a wing testing. Wing has same airflow speed along the whole length of the wing.
What a fascinating experiment and quite brave of you to try it. Don't stop.
That is so damm cool!
Shark denticles look up the lift capability
Keep going and you will invent a helicopter.
Add a pogo stick and foot controls off you go
Can't HEAR !!!! YOU !!!
Wow, he didn't get hit in the head.
New idea bestofflok
It looks to me like centrifugal force pulled the weight up rather than the wings lifting it up, however holding the post may result in lift of the entire mechanism the wings didn't lift the weight. My opinion mind you.
Back in the 50s they used air driven jet engines on the outer wingtips. It seemed to work ok but the problem was getting them up to speed so that there was enough air to get the jets firing.
Interesting stuff! Do you have any washout in the wing panels to compensate for the velocity distribution?
Is it actually spinning at a constant speed or do the wings speed up and slow down in a single rotation? This would affect the angle of attack of the wing wouldn’t it?
Good to see you back in the saddle brother, good to see new inventions, but don't forget to take chAIR out for a workout this summer!
Holy engineer! Crazy idea. Go on!
This is interesting experiment 👌
I think this is called a helicopter
Hi
I think the pitch angle is to big
I hear you!
Vad säger grannarna?
De känner mig vid det här laget, så.....
Why exactly are you doing this sir?
It's called curiosity.
The ultimate goal is to build a 2 seat electric VTOL machine that is able to stay up in the air, hovering around, for a full hour.
this looks very ''early stages'' but also great, what is the next step towards your 2seater goal? bigger motors, more stable wing?
1Testing with four wings and winching mechanism.
2 The control system.
3? - I expect to fail in at any moment, not kidding, so no need to plan too far ahead...:-)
@@amazingdiyprojects sounds like a plan, but please be careful, this whole thing looks like the zombie slicer from Half - Life 2, meaning, don't get sliced please :D
Useless!