Comment by healthyfatboy on June 29, 2011 at 5:02am

Isn't the point of a quad over a tri to not have any mechanical failure points like the yaw mechanism on the tri?

Comment by Michael Evans on June 29, 2011 at 5:36am

Possibly they use this for thrust vectoring?

Comment by Arachnida on June 29, 2011 at 6:14am

Guess they didn't find any decent CW / CCW pair of props in that size. (Prop size is 500 mm diameter) The more I look at the pictures I believe they are using 4 servos, tmho the red and green part are moving too. Or maybe they do this because a heavy and big 'normal' quad is sluggish on YAW?

Developer Comment by John Arne Birkeland on June 29, 2011 at 6:18am

Hey! They stole my idea! :)

By placing control surfaces in the downdraft of the propellers, you can maneuver and do position hold without having to tilt the multicopter. Perfect for nice controlled video shoots while moving around. No tilting also means less wind resistance when doing position hold.

Comment by Arachnida on June 29, 2011 at 6:50am

Hi John,

now I'm starting to understand why they prefer to use servos with all the risks of having moving parts involved. So you think the camera only needs tilt (for framing the object) and no roll gyro compensation? But why are they using two different types of downwash controls?

Comment by frederic reblewski on June 29, 2011 at 8:44am

could anybody direct me to basic information on the different approaches  to control YAW in a multi copter ( sorry for the basic question but I have historically been more into fixed wing )

 

thanks

Comment by Jack Crossfire on June 29, 2011 at 2:22pm

RC modelers always figure out the weirdest ways to do things, normally adding the most possible weight.  There was another guy who added the horizontal stabilizer of a UH-60 to make it pitch down.  It's all about the look, of course.

Comment by Arachnida on June 30, 2011 at 2:17am

@Frederic:

1: With even number of motors: half the motors turn CW and the other half CCW

2: Tricopter: using a servo to tilt one rotor

3: Like above picture using thrust vectoring

4: ?

Comment by Christopher Cooper on June 30, 2011 at 2:18am

I take it the green and red paddles are the yaw control surfaces. Notice there are tilted surfaces under the other two motors too, I wonder if they can be adjusted.

Comment by Arachnida on June 30, 2011 at 2:35am

Guess you're right, the tilted surface seem to have the ESCs mounted underneath, maybe for cooling? Here is another picture:

Comment

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