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Magnum XL 91 RFS Blue R/C 4-Stroke EngineProduct Review (submitted on November 19, 2010):
Running 15% cool power, 14X6 prop, have three in my planes, an Astro Hog, a Four Star 60, and J-3 Cub. Perfect low idle, transition, and all the power i need. I prime the engine, add my glow heater, and 1 or 2 back flips and it's running without any fuss.