Dave,

I really have no idea who you are talking about in AMA. I know many who are running on the ragged edge to make weight with electrics.

The Defiant was a one of, not a manufactured airframe. I suppose any smaller then 2-meter model could be considered just for AMA, but that isn't the case. And I'll bet that the BM 2.2 wasn't designed just for AMA.

I refer to the high requirement for knife edge capability in F3A now. That is what is making the fuses get bigger, nothing else. And you're correct, a legal 5kg F3A electric model may very well not be able to fly the entire Masters pattern. Another reason to increase the weight limit in AMA.