I'm hitting only about 6600 rpm on Omega 10% and the Menz 20x10 after 3 gallons but the performance in my 14 1/2 pound Patty Wagstaff Extra is breathtaking. I think I am going to give the Mejzlik 20x10 a try. TonyC, you have a sick engine on your hands judging by your numbers with the APC 18x6W, my Saito 180 turns that same prop much faster...send that engine back to the distributor.

jmw