This might be useful reading. http://www.generalhobby.com/arfmfg-s...ane-p-577.html

Since the equivalent of the single gas engine is suggested as 1800-2000W you can perhaps go with two of those.. that would give you well over 100W/lb... so probably plenty for a 30-35lb scale model. What size props are suitable???... that, along with the applied voltage, will determine the correct Kv for the motors. Motor size: if you are looking at 1800-2000W, the 3W/g rule suggests motors weighing 400-600g. [Hacker A50-12L?]

Cheers, Phil