I just finished building my Alpha 40 trainer, with a Magnum .52 for the power and now its time to set the CG and break in the motor before its first flight. My question is when setting the CG do I check with the tank full, empty or 50% ? The directions that came with the plane list the target CG point on the wings but did not give any suggestions about fuel level. The tank on the plane is mounted front of the wings, directly behind the firewall so Im sure the fuel level will affect the CG, or am I over thinking this? My flying partner who will be the person to do the maiden flight is out of town and I cant ask him but would love to have the plane setup when he returns to test fly this weekend. I got my first fly time on one of his trainers a few weeks ago, all I can say is there is alot more to it than i though and who ever designed the buddy box idea was a great person LOL