Hey Ben,

Your just the man I need to talk to. My new CG Chipmunk was built , 0 tail, 1/4 wing , and 0 thrust. The darn thing climbs like a homesick angel. The down trim required was very visible. Before I tried to raise the trailing edge of the wing, I decided it would be easier to crank a little down into the engine, about 1 3/4 degrees. It takes a little less trim, but nowhere near none. So now I am going to fix the saddle and move the wing to zero. How could 1/4 dgree up in the wing have such a huge effect ? And once the wing is zero , should I put the engine back to zero? Or is this a personal preference thing ? There are no numbers mentioned in the instructions or the plans. I thought a wing had to have a positive AOA ?