Thanks TJay I'm fairly well convinced I will buy and fly the Challenger. BTW he was talking about a Hirth engine. I think they give 2 2 stroke options and 2 4 stroke options. All of them air cooled which I didn't even know there was such a thing as an air cooled 4 stroke. They DO NOT offer Rotax as an option. Wat u are saying makes a lotta sense now. No wonder they look so much alike! Also I spoke to him for over an hour so a lotta things covered. I asked about paint and he said to paint it with latex house paint. I had experience as a bodyman years ago so I can spray fairly well. I cant imagine painting any vehicle with latex. Just a question. If you love your plane so much, why are you selling it? Oh yeah he said by putting the engine right side up on the top he can get a bigger prop on it.