Hello; I had an FP15 on a little electricub, that was a great engine. I also had a thunder tigre 15, I don't remember much about that one, I traded it for a Saito. I curently have an Enya 15 in a 4 20, that's a great little engine too, a little noisier then the FP but also a little more powerfull. I thnk my favorite would be tne Enya 15.