I took out my hangar 9 texan arf today. It has an OS 91 surpass. Everything went without a hitch, I flew it 3 times, but one thing I noticed is that it was kind of slow. For example, when trying to do a loop, it would almost stop in midair as I reached the top of the arc. The 91 is adequate for this plane, but I bet a 120 would be better. The engine is using a 14x8 APC prop. One thing I wanted to know: I am using 10% fuel and I wanted to know if it is ok to up it to 15% or will I screw up the engine. Is is better to stay consistent with the fuel you use?
The plane itself is beautiful, and I am sure it wasn't designed to be speedy, but it is kind of a dog with this engine.
Joel