RE: ARF Mentor-G from MAXFORD USA
The CG should be 25-30% of the chord on a straight non-tapered wing.. Ignore the book and calculate the CG. Set it at 25% and move it back to suit your flying preference. Also you might set the motor out a little farther with washers instead of so much lead. You don't have to move 2+ lbs of weight very far to have a movement in the CG. TNT Landng Gear will bend any size you want. They have a sheet on their website that you fill out with the measurements you want. Then they will make it for you. Excellent quality aluminum. I have used them several times.