Well guys I feel that I need to reply on this subject. I've been in the engine industrie for 30 years and have yet to see the kind of horsepower that the DA 150 puts out on the first flip. I run a ZDZ 160, a 3W 120, an RCS 215, and they all cant' hold a candle next to the DA. I'm not knocking the other engines by no means. The power this engine has is so impressive. The boys at DA did there homework. I just bought a DA 50 to go into a Aeromaster, So I feel that the engine will live up to it's name. Just a little food for thought, I've been in the R/C business for over 40 years and Customer service is what we expect, but not always given. If a company like Desert Aircraft is willing to make things right at there expense and at no cost to you, That is a tall sign of a company that is concerned about there reptation verse's there profits. Happy Flying!!!