Right now, all I lack to finish the Conquest is the fuel tank, battery, and receiver install. I weighed the plane with this stuff, and I am just under 7 lbs. I used light components and the wing cores were lightened before sheeting. That 13 x 10 may be the ticket, since the plane is light and has thicker airfoils than most other 60 pattern ships. I am sure Troy is correct that flight testing is the only way to get the right combination.

I like to use engineering theory to get close, then refine with testing. Just another way to enjoy the hobby. I started this thread hoping to understand why pattern pilots use so much pitch. It may boil down to quiet operation requiring lower rpm, more than anything else.