Is it possible for an octocopter with 26" propellers to fly stable? What is the largest propellers that will fly stable?
bump. Also I must add that I only want it to hover. Is this less taxing on the flight controller?
There is no rotor size limit concerning stability. The flight controller does not really care about your flying style as long as you don't crash.
>>945624
But I heard that large props have too high inertia to be controlled quickly enough.
>>945723
So get a faster reacting controller duh
>>945747
Not OP, but I don't think a faster reacting controller would solve the problem. If the props are large enough, they might have too much inertia for the motors to slow down fast enough to stabilize the multirotor correctly, the flight controller would have nothing to do with it. The friction from the air and within the motor just wouldn't be enough to slow the prop in time for the flight controller to make reliable calls, in theory.
Personally I don't see why you would need such a big multirotor. A helicopter-style vehicle would probably suit whatever need you have better and you're not limited to a specific prop-size with that project, either.
As far as the answers to your questions go, I have no idea.
Get appropriate size motors.
Just make sure you don't put a pole in the right half plane
>>945859
Would gearing the motor help? This will increase torque no?
>>945228
There's not really any size limit, but if you decide to up the amount of propellors per rotor, whatever you do, stay away from even numbers above 2.
I'm not sure if it's the same with this sort of thing, but that really fucks up ducted fans, which is the reason that nearly anything worthwhile will either have two, or an odd number, of fan blades.
>>945930
What's the physics reason for that? Assuming some kind of a resonance?
>>945912
>Would gearing the motor help? This will increase torque no?
do some fucking research you pleb.
http://www.rctigermotor.com/html/2016/Efficiency-Type_0106/306.html
>>945930
Odd numbers hurr durr.
You guys won the war against my people with pic related. As the laws of engineering are universal, we don't have any problems with this here either:
https://en.wikipedia.org/wiki/MBB_Bo_105
Neither have you:
https://de.wikipedia.org/wiki/Sikorsky_S-65
Rotors with 2 blades have the beste efficiency though, as long as the tips do not reach critical speeds, which they don't do in the drone area.
>>945723
The bigger the rotors, the bigger the drone. Bigger drones generally move and tilt slower, so a slower reaction time is no problem.
This is the biggest Quad in existance, 80kg payload:
https://www.seedmatch.de/image/5849118609311194819/updates/5f33c-43d4aade237a0ddc/content
Was demonstrator for what we are currently up to in Germany:
http://www.volocopter.com/index.php/volocopter/vc200-prototyp
>>947122
The even blade problem only applies to ducted propellers
>https://www.seedmatch.de/image/5849118609311194819/updates/5f33c-43d4aade237a0ddc/content
Does it fly good
>http://www.volocopter.com/index.php/volocopter/vc200-prototyp
That will fail, frame is too big
>>947230
>Does it fly good
They tested the components with it before they built the big one, so I guess it did.
>That will fail, frame is too big
Hovering with payload works just fine so far.
https://www.youtube.com/watch?v=PDcpwhhUFAo
