Well, I changed out the 8x4 for a 7x6 -- night and day difference.

In the past, to maintain the same speed level as the other pilots I was finding my fuel economy keeping me farely close to the 5-minute combat flight -- finished several heats at deadstick.

I clocked a test flight with the 7x6 prop, maintaining a much higher airspeed, and got 7.5 minutes off of the same 2oz tank that I used to barely get 6 minutes. At full throttle, most of the other planes flying Magnum XL .15s and OS LA .15s could not keep up with my 15 CV-A -- finally, this is what I invested $110.00 for.