We've been flying them with all sorts of engines on up to a Saito 150. I don't think the engine would make much difference. They all seem to do that flop regardless of engine.

mxcop, I don't really remember trying it by cutting the throttle with lots of speed on the aircraft and don't know if anyone else did either.
This is something we will have to try. But, it's very cold here in the mountains and we may not fly until the weather calms down.

3dbob