RE: Cermark F16 Maiden Flight
I had the CG at 8.5" per instructinos. It did not fly nose heavy at all. Very fast roll rate with the aileron throw as recommended for hi and low. Needed a bit of up elevator trim in flight. They suggest you set up neutral then add a bit of up trim before maiden flight which would be right on. Take off from grass will be a pain with the stock nosegear. I'm not sure if your OS 91 has enough power for grass takeoff. It's a pretty big airframe to pull around.