OT. Quadrocopters.

Feb 18, 2012 23 Replies

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to be a

control?

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etty

for

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ectives.

usly

yes they need something for left right, if it had four rotors, I think it could work with just four individual collectives

imagine that instead of a swash plate controlling one rotor, same control going to the collective on the four corners

got at bit convoluted I guess :)

you have four rotors 1-2-3-4, 1-3 rotate one direction, 2-4 the other direction so torque from 1-3 cancels torque from 2-4

to go in the direction of 1 you increase speed on 3, since torque on

1-3 still needs to match torque of 2-4, speed of 1 needs to be decreased

-Lasse

be a

control?

(which

collectives.

I'm certainly not an AeroE, but I don't think that's right. You also have the problem of differential lift on the two sides of each prop. Even if they're counter-rotating, you're going to risk stalling one on the back-stroke, when in forward motion.

Sure. That was my point about the "collective/cyclic" analog paradigm still holding. The lift of each prop is the product of the collective and the sine/cosine of the cyclic position.

Actually, I got what you were saying after reading Jason's post immediately following yours. ;-)

This is really fun:

Variable-Pitch Quadrotor -- Introduction - May, 2011

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A major improvement, to be sure, but to what end at what price. I can afford Parrot's $300 URDrone, but no way in Hell is anyone gonna be marketing a vari-pitch prop quad cheaply. Perhaps one day, but no time soon. I laughed every time the narrator claimed a vari-pitch prop would "maintain simplicity". A statement ludicrous on the face of it! Now you got four separate servos, control arms, rods, gimbals, joints, etc, on each motor plus control hard/software. It jes got a whole shitload more complex. And for what? So I can flip upside down, quicker? Not even a capability I was thinking of, let alone looking for.

Ah, but science marches on. ;)

nb

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