Hello, has anybody tried octa_quad configuration with coaxial motors, more precisely with these motors
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=6565
Is this the right way to put the outputs for x frame configuration on APM? This is the configuration as I understood it from the code.
Thanks
Marinela B.
Replies
Hi Marinela, after a bad crash with my heavy octo now i rebuild my quad in same configuration.
I think you should wait (like me) for takeoff with your octa-quad "X8", because for me there is something wrong with the engine management about the YAW correction, anyway the arrangement of the motors and the direction of rotation in your image is correct, although personally I would have done differently, so that:
Front Left UP: CW
Front Left DOWN: CCW
Front Right UP: CCW
Front Right DOWN: CW
Rear Left UP: CCW
Rear Left DOWN: CW
Rear Right UP: CW
Rear Right DOWN: CCW
like this AeroQuad: https://www.youtube.com/watch?feature=player_embedded&v=2xyyuwX5HqM
I don't like all the upper props rotate in the same direction do poor yaw control in one direction, because there is a substantial difference between the propulsion propellers upper and lower, I mean as a thrust.
The lower propellers are to grind air pressure than the above, then "dirty", and I think this might give different yaw control in the opposite direction.
But in this case there would be enough to alter the mixing table.
Cheers,
Marco
I would think that config would work very well... The real question is, what advantage does it have
over an octo. I don't think there is a measurable increase in efficiency with counter rotating props.
The Russians did it with one plane.. and that’s it…
I can't speak for the programming or control board but I have used the smaller version of these motors in a Tricopter with great success and really like them. You have to make or modify your own motor mounts and the props are a hassle but worth it. I am using 10X4.7 instead of the 8X4 props that came with the motors with 6 Turnigy Plush 10 amp ESC's. I would use the smaller motors for a start, they will be easier to work with.
Ed
http://vimeo.com/30682403