Another comparison, as far as power is concerned, would be the Ziroli Stearmans. He's got the 77" and the 87" models both designed for gas engines. The 77" model weighs in around 20 lbs or so and is designed for a G38 or US41. These engines swing an APC 20x8W at around 7200 RPM. The Brison 2.4 will swing the 20x8W at 7800 and is a much more powerful engine that the G38/US41/Q42's throughout the powerband. The GP model is kind of in that gray area between small glow-powered planes and larger gassers. This is why I still think something like a G26, RCS140, or even the RCS 180 would be a good gas choice to have plenty of power without tearing up the airframe. With the proper reinforcements, the larger engines might work, but I'll stick with the smaller ones.