Coax helis are very stable, by nature, because of the big flybar.
This flybar tends to bring the heli back to a level attitude.
Your helicopter isn't meant to fly real fast, and the only way you
will likely get it to do so is to increase the speed of the tail motor, or
to increase the pitch but if you try to bend the prop, you have to make
both sides the same and that is difficult.
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