Hi.Recently, I'm interested in variable pitch quadrotor which have one motor in the center and the other rotors are connected to it.Thrust amount is controlled by servos, control pitch angle of rotors.Anyway, currently, I don't have good idea to make it.So I ask to here to get detailed picture of it.I'm thinking to use tail rotor of middle-sized helicopter.But, how to link them to center motor efficiently?
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I think Luke is right, you are going to have to have multiple gearboxes and torque tubes etc. transmitting power to each arm of the quad increasing the resistance on your powertrain, plus the pitch applied to one rotor will reduce the output on the other 3 rotors, resulting in a platform that might oscillate a little as the AP tries to maintain a level attitude. That being said I'm sure it can be done but for what benefit, if it was larger enough a hydraulic system would be able to provide a more stable power output, but why when you can use 4 electric motors.
Just thinking outloud here. All of the linkages, drive shafts, gears and joints might increase weight and reduce reliability compared to having a motor for each prop. The appeal to a multi-rotor for me is the relative mechanical simplicity. The only moving parts on the whole thing are the motors and props which doesn't leave a lot to fail mechanically speaking. In a sense it would be exchanging electrical complexity for mechanical complexity. It would probably require some fiddling with the firmware as well since as props change their pitch the power going to all other props is proportionally affected. Regardless of the caveats it sure would be neat to see somebody try it!
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You might have better luck with this type system rather than a single or dual motor setup.
The simplest way to use VP w/ a quadcopter. This would only need one servo per motor.
VP_Motor