i found this out over the week end i think as I've just purchased a used cessna 172 trainer fitted with a sc 46 with a Ram 11x7 prop. it takes a while to get it into the air and my first crash was caused by a stalled turn while trying to get some height yet the throttle was wide open i know it was my first flight but i didn't think it would all end so quickly it did seem as if the plane was under powered after reading this article am i correct in thinking it was over propped after I've repaired the damage would the two props mentioned be OK IE the 12x4 or 11x6 prop Thanks for ya help Ady