What do you call those large flat planes that go on the tips of the eings. They are the same shape of the wing cross section but are about and inch larger all around and are placed on the very tips of the wing. What are they called and what do they do?

I ask because I have a AKM 3D Freedom that is 2 days from its first flight and I have one defect in consruction. Woth wing tips curve in just a bit where the covering has pulled them in. (I'd post a pic but I've misplaced my Flash reader). I thought about placing one of those things on it and sort of fudging the curve with a bit of epoxy and micro ballons.

if you mean tip plates, i think they are to reduce the tip vortices caused by the airflow, increasing the efficiency of the ing tip and the aileron tips-better roll authority.

could this be the sort of thing you mean?

That's it! Are they worth the extra weight?

Tip plates will:
Increase the roll rate
Reduce the stall speed
Reduce the landing speed
Reduce the snap and spin ability. (You'll need more control to do these)

Are they worth the weight? They don't have to weigh very much. I have used 1/8 lite ply and thinner, even 1/32 ply.

I mentioned then in my R/C Report column, stating the readers might want to build them where they could be bolted on and several readers replied they had tried them. All of them agreed with the statements above.