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My new octocopter frame

Posted by Peter Koch on March 13, 2011 at 2:30pm

This is the new folding frame Project I am working on.

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Can anyone tell me if it´s possible to control the eight counter rotating motors with ACM.

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Comments

  • Peter Koch March 14, 2011 at 1:33pm

    Hi Sebastian,

    thanks for the link´but I already have the code, but I am not sure if I can use it on my configuration.

  • Peter Koch March 14, 2011 at 12:40pm

    @ Peter Seddon

    Do you think I can use your Okto code?

  • Machina March 14, 2011 at 11:51am

    Is there a primer on how to design and build a conning tower, or canopy as it's called?

  • Peter Seddon March 14, 2011 at 10:30am
    Having built an Okto based on the early AC code I am not sure about these issues with the I2C bus. Yes it can and does fail but so can there be many other sources for failure. Yes if it brings the whole bus down then all motors stop and the craft plummets to earth. With a quad or hexa what happens if a pwm ESC fails?

    I have looked at converting the new ACM code to I2C and okto but it is nowhere near as easy as I had hoped it would be and it was in the early AC code.

    How about this http://www.aplanding.com/forums/showthread.php?t=5033

    Peter
  • Darren March 14, 2011 at 8:35am
    Sorry, IS, I didnt see your post :) I concur, and await a responce as I'm not sure which way is more stable.
  • Darren March 14, 2011 at 8:27am

    I'm sorry to disagree, unless your using a speed controller that can tell the motor to spin in reverse, which direction the motor spins is just flipping one of the three outpu wires coming from the esc... So to further go on

    top motor spins ccw, bottom motor spins cw in relation to itself, but since its flipped upside down, its still ccw in relation to the frame.

    The top prop is a normal prop, and the bottom is a normal prop but flipped upside down on the motor shaft.

    So the two motors will complement each other.

  • DaveyWaveyBunsenBurner March 14, 2011 at 8:02am

    Hi,

     

    I'm guessing (and it really is just that, a guess!) that the yaw issue depends on whether you have CCW/CW CW/CCW or a matching CW/CW CCW/CCW propeller arrangement on each arm. It might be worth swapping one set (either top or bottom) of motors/props along one (so front right becomes back right) in order to see if this works better?

     

    I may well be wrong on this but, my thinking is if you have a top and bottom motore that cancels the torque effect of eachother out, then you will loose yaw effect. If they compliment, you wont?????

  • Peter Koch March 14, 2011 at 7:54am

    Hi Darren,

    your configuration with the top/bottom esc's together on the signal side will work for Roll, Pitch and Throttle but not for the Yaw because you need the turning moment of the motors and with counterrotating motors you don´t have any turning moment.

  • Darren March 14, 2011 at 7:38am
    However I do have to add, I agree with Jani too, there are much better ways coming down the pike... I also think Y'ing the two motors can get tricky due to syncing rpms two a tee. independant control allows minor differences between motor/esc's to be handled without alot of the issues that come with y cable, as well as failure of a motor for i would imagine.
  • Darren March 14, 2011 at 7:30am
    I think Davey is right, can you not just tie the top/bottom esc's together on the signal side for simple redundancy on each arm? should just act like a normal quad, but with (a bit more horsepower) ;) then use a seperate bec for the electronics.
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