(deleted post - I was going to say something about general guidelines for changing number of airfoils, but then realized that we use things a little differently in F3A which may go against the normal approach. Generally you get more thrust and drag from an added airfoil, so you reduce diameter to balance the power load and increase pitch to compensate the drag and loss of RPM/air speed. However we operate in a unique power curve and manage throttle a little differently, so the general rules might not give the best F3A results).
Last edited by Jetdesign; 02-05-2015 at 07:56 PM.