I have a two channel powered glider "Calypso" by miniCraft. I broke the wing (flew into a fence post on a dead stick landing) and the nose so I put a spare wing on it and built a new nose. This wing has a flat bottom and quite a bit of dihedral. It has about the same area as the original wing, maybe a little less, but it's rectangular where the original wing was severely tapered with dihedral tips. Anyway, since I switched out the wing, my plane handles as if it has 2/3 left rudder even though I have it trimmed max to the right. If I give it full right rudder, it will straighten out and maybe turn a tad right, depending on the wind. Prop angles to the right a tad. I have shifted the battery etc so it's even slightly heavy on the rhs. But the darned thing just wants to go left. If I shift the wing over to the right, reducing the wing area on the left, it helps a bit but not much. Yes the nose angles slightly left, but the motor/prop more than offsets this.

Also, with a 600maH NiMH, I get about 3-4 minutes on full and half power before the battery fades and the motor throttles back to about 1/4 power. New battery, (fairly large) brushed motor. Are brushed motors inefficient? How the heck are these FPV guys flying 15 km on a battery?

vh2q,

I would check that the wing, the tail surfaces and the fuse are all straight and perpendicular to each other when the wing is installed.
Yes, the fuse nose needs to be staright, or a left hand yaw will be introduced by that deviation.
The bank always follow a yaw movement for wings with dihedral.

Second, I would check the lateral balance.

Check this article:

http://masportaviator.com/2006/09/05...up-part-three/