A buddy of mine recently purchased a used moth and was afraid to try it on his on, so he brought it out to the field and had me and another buddy check it out and then put it through its paces. BOY was it nice! It had an O.S. 52 surpass 4-stroker on it. There could not be a more perfect match (except maybe a saito 56) for this plane. In my 10 or so years of flying I have flown many, many planes, some my own, but mostly other peoples who wanted me to check them out. Some on the maiden flight, but mostly used planes that someone bought and was scared of until someone else flew it first. Out of them all, the Kyosho Tiger Moth 40 is absolutely the SWEETEST plane I've ever flown! Very gentle yet agile and responsive if set up right. It was a very relaxing plane too, no bad habits hidden in this bird any where. I was so impressed that I'm gonna get one of my own. It definately needs a 4-stroker on it....(anything else would be a sin....sorry) A plane that looks that good, flys that good, should also sound that good! I have even toyed around with the idea of getting the Great Planes 90-120 size....it's BIG! If you are looking for your first "bipe" or just a great sunday flyer, you cannot go wrong with the Tiger Moth 40 from Kyosho!!!!!!