Home Forums Everything about the Baby Tricopter Baby tricopter yaws after punch outs

This topic contains 8 replies, has 5 voices, and was last updated by  The-One-Who-Never-Crashes 2 years, 7 months ago.

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  • #36539

    Hawk
    Participant

    Hey so I am new to tricopters but have been flying quads for about 8 months now. Just built the baby tricopter and whenever I do a hard punch out it yaws to the left about 2 – 3 full turns (or till I give it throttle again) when I cut the throttle. I have the motors set to allways spin when armed so it stays stable with 0 throttle just like I do with quads and I am using the recommended electronics and pids. Dose anyone know how to fix this or is it just a tricopter thing? (Doesn’t look like David had this problem in his video)

    #36547

    Could it be a channel mapping issue? Maybe you have some hidden mix on your radio that you forgot to disable when setting up the model? Just an idea. A video would be helpful. But as Terje said, airmode doesn’t work well on tricopters.

    Try checking those things and disabling airmode and let us know how it goes! 🙂

    #36550

    Hawk
    Participant

    Ok I did have air mode on so I will turn it off and see if it makes a difference let you know when I try it

    Yes turned off air mode and now it only dose about 1/4 turn and David says this is normal if your overly aggressive on cutting your throttle

    #36808

    fpvlog
    Participant

    Same problem here.

    i hope it could be solved. I dont like this!

    #36810

    lauka
    Participant

    It’s a thing with Tricopters. The torque of the decelerating tail motor forces the copter to turn.

    In Triflight this can be reduced by increasing tri_motor_acc_yaw_correction. Another way is to disable active braking from your tail ESC, but that’s not good for overall flight performance.

    In the next version I’m currently working on I’m hoping to further improve this. Initial tests seems very promising.

    #36824

    BLeeK
    Participant

    I thought it was more to do with the direction of motor spin being un-even- there’s two spinning one way but only one spinning opposite, unlike nearly every other multi-rotor which has an even number of motors which automatically balances out the forces of torque….
    Or am I just re-wording & over-complicating what you already said @lauka?
    (I seem to be pretty good at overthinking these things! 😉

    #36826

    lauka
    Participant

    @bleek: Yes :). All the motors are decelerating when throttle is cut. Because there’s uneven number of motors, one of them is forcing the copter to turn due to the torque generated.

    #36829

    fpvlog
    Participant

    Ok so I tried increasing tri_motor_acc_yaw_correction from 10 to 15

    It changed nothing. After a punch out when i cut the throttle it sometimes does a full 360 (so scary!)

    How much should I increase it?

    #36830

    @fpvlog Change it as much as necessary 🙂

    No, seriously, just go out and increase the value in increments of five until it gets better.

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