Hey Deadeye - as memory fades with age "you are the man". I apologize for not giving you the credit.[:@] I took your 1/8" and verified it using Pappas' stuff. 1/8" at the edge of the firewall equates to about 4/8" at the wing tip of a 12" prop. That's about 2 1/2 - 3 degrees. It flies beautifully with your recommendation.