Nope, the propeller can't be installed backwards on this plane. But you can break it! ;-)

There is no "UP" stick on this two-channel plane. The left control is a throttle, the right controls the rudder-vators (I guess you'd call'em). It has a V-tail.

My current theory is that the tail assembly is not being held in proper alignment with the fuselage. These planes have a long thin carbon-fiber tube connecting the tail and fuselage, and there are little bolts to fix the tube at both ends to it won't rotate.

I think it's rotating despite the little bolts, so the tail is out of alignment and sends the plane down to the left or right, hard.

I think I have enough propellers, white glue, and packing tape to make some more attempts. Maybe I can put a drop of CA on that shaft at the tail join and keep things from moving around. I'll post again if I have any luck!