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Old Dec 09, 2012, 06:20 PM
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unequal prop thrust

Originally Posted by yarg View Post
My quadrotor yaws slightly to the right, but only when applying thrust. It's slight enough that it doesn't really effect things too badly, but enough so that I have to stop and correct the direction I'm facing as I'm practicing.

Any idea what's causing it? I admit, my props aren't balanced, but I'm not sure if that would be enough to cause this.
I have been having tha same problem off and on (yawing, pitching, rolling, or droping and arm) and was having a hard time figuring out the source of the problem. So I built a little test rig that shows me the thrust of a prop. Checking at full throttle I can see that thrust values can vary greatly even on brand new props, sometimes even up to 30% or more.

The props I have been buying are cheap so I guess you get what you pay for.
I have been using these because I tend to break alot learning acro.
But having unequal lift doing acro probabably contributes to my crashes.
Maybe some of you can suggest a good source for props that are not too expensive

In the meantime I have been experimenting making the prop thrust even by twisting the props a bit. Having good results with this so far.
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