I know this is kinda late to post this, but this is in response to JWN's post a minimum engine cost of $500. The Webra 1.45 that Piedmont Models imports is the lightest and most powerful 2-stroke pattern engine (as far as I know). And the best part, it only goes for $395! When I get my next pattern plane, I will definately be giving Lee a call for the new Aero-X! Just my opinion.