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Old Jun 19, 2012, 10:43 PM
F550 Hex, Blade mQX
United States, CO, Colorado Springs
Joined Jun 2012
97 Posts
Question
How does a Direct Drive Variable Pitch Multicopter Achieve Yaw?

ASs stated, there seem to be several Direct Drive (Single Motor driving all props through gears/belts) Variable Pitch Multicopters, but i am confused as to how these obtain yaw motion.
I know that on independent drive multicopters, each motor can spin at a slightly different speed to achieve the desired yaw, but a multicopter with a single motor cannot achieve this through the same method.
Not sure how variable pitch could achieve a yawing motion either on a direct drive.

So, how does a Direct Drive Variable Pitch Multicopter Achieve Yaw?
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Old Jun 19, 2012, 11:20 PM
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Joined Aug 2007
414 Posts
more lift created by increasing pitch is the same as increasing rotor speed on a fixed pitch multicopter
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Old Jun 19, 2012, 11:58 PM
F550 Hex, Blade mQX
United States, CO, Colorado Springs
Joined Jun 2012
97 Posts
I know about the lift, and providing more lift in one side of the aircraft would provide pitch and roll, but still not yaw.
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Old Jun 20, 2012, 01:10 AM
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USA, CA, San Carlos
Joined Apr 2003
416 Posts
Increased pitch on one pair of rotors and decreased pitch on the other pair. This creates the torque difference to yaw the multicopter.

Don't ask me how to control yaw at 0 pitch.
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Old Jun 20, 2012, 05:19 AM
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United Kingdom, Swansea
Joined Mar 2011
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Well at 0 pitch with cp heli blades you're either on the ground or heading there fast
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Old Jun 20, 2012, 10:05 AM
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USA, CA, San Carlos
Joined Apr 2003
416 Posts
Stall turn?
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Old Jun 20, 2012, 02:04 PM
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United States, DC, Washington
Joined Dec 2007
418 Posts
Quote:
Originally Posted by SGsoar View Post
more lift created by increasing pitch is the same as increasing rotor speed on a fixed pitch multicopter
This is it.

It's all about creating that resultant torque. There isn't anything intrinsic about the motor speed that would *require* a differential to create the torque needed to yaw.
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Old Jun 20, 2012, 02:11 PM
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United States, CA, Los Angeles
Joined Aug 2009
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The easiest way I have found is to use a V-Tail although I am not using it right now for variable pitch. Otherwise, it would require a sensor to detect when the pitch is positive or negative then adjust the motors' speed accordingly or on a tricopter, reverse the rotation angle..
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Old Jun 20, 2012, 02:28 PM
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United States, CA, Los Angeles
Joined Aug 2009
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P.S. IMO, there is little or no need to worry about Zero Pitch. If the the Pitch remains there for any length of time, the copter is going to drop like a rock. Now ask me how I know this. LOL
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