I folded the wing on one of my Predators, but I had to work at it. I was getting ready for NE Nats, a C class event. So I pulled my .25 and put on an OS .32F with a mousse can that I had handy. What a monster that created.

On the first test flight, I did a full power dive, and the wing started flapping like crazy on pullout. I chopped the throttle and landed in the tall grass. I acutally had fairly good control, all things considered.

This predator had been hit from above in a previous contest, so the spar might have been weakened, I'm not sure.

The spar didn't break, it just folded sideways and buckled badly. I mounted my servo's sideways for CG reasons, and clost to the center to make rolls crisper. The spar buckled in to both servo compartments, and the foam tore some though the receiver area.

I think the problem was not having enough foam along the spars in the center of the wing. If I do another predator, I will make sure everything is mounted farther outboard, and farther from the spar where possible, so the spar can't flex front to back. Basically, make sure the spar is well supported on both sides, espeically in the middle.

Oh, and I fixed the Predator in question in two nights, test flew it in the rain the next day, then fought 5 rounds of combat with it that weekend. The fix was epoxing some carbon fiber doublers to the front and back of the spar.

Predator + OS .32 + KY mousse can + APC 10x5 = fast turning rocket ship. One hell of a class C ship.

Here is the predator in question, with the origional .25 engine, before folding the wing.