Adanac18........OK! here's my recommendation for your power plant. Zenoah, G62 lite by Ralph Cunningham at rcignitions.com He will build you an engine that is as good as any engine sold on the market today. It comes with a custom motor (engine) mount, CH electronic ignition, which is enclosed in the engine mount, and has a lifetime guarantee. Mine only weighs 4.1 lb. This will be a perfect match for the Aeromaster, and the Zenoah engine has a sterling reputation. Bob