F3M is a new area within the FAI designed for scale aerobatics. It is very different from IMAC and pattern. It is sort of a hybrid. F3M flies large scale airplanes in a 3 sequence contest format. You fly a known, and unknown, and a freestyle and that is it. F3M has some fans in the US who are trying to get some contests going but so far none have been held. I know that in Europe there has been some F3M activity, but I do not know much about it.