Originally posted by IronCross
Using Power Master 15% fuel, a 9.5X7 APC prop, OS#8 plug, baffel removed from the muffler etc we have clocked these at slighly over 90 MPH with a CHP radar gun. Typically we set the engine up to hit 14.8 to 15K on the ground and go. At 15K or more rpm you start running a good chance of leaning out in the air, the last thing you want to happen during a race.
I ran it again today with the new APC 9.5x7 pylon prop and running on Powermaster YS 20/20.
Was getting 15,200rpm on the ground and it ran great. I really like flying this plane.....now to finish setting up my Weston Magnum and get some real speed!