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Old 03-10-2008 | 10:32 PM
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masama1107
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Default OS .35 FP reving up after a while.

I'm flying a Top FLite Tutor I profile with a OS .35 FP spinning a 10X5 Top Flite wood propeller. I set up my engine running rich on the ground (about 8500 rpm's). After about 2 1/2 minutes of flying time, the engine starts reving up and remains running very fast for the remaining to the tank. I'm using a 4 OZ uniflow brodak tank.
Any suggestions???