I built one of the Bear monoboom conbat airplanes (don't recall the name) for a clapped out ST G 21-35 ex slow rat engine. I have a small perfect hard tank uniflowed and run crankcase pressure. On an APC 8 x 8 and 10% nitro, it is an honest 100 mph airplane. It runs for about two minutes on the tank and I am sweating and shaking by the time it quits. Haven't flown it in some time.