As you can see from the title I have had some bad luck with flex shafts in my Impulse. I corkscrewed one with the original power plant and now 2 more with a 2000kv motor. All three times I was using a sharpened and balanced 42x55 prop and a 4cell setup. I ensured that the motor was lined up perfectly with the stuffing tube as Steve suggested in a previous post but the new shaft today didn't even last a full run. The shaft was well greased and moving freely. The new power plant is only running at 37 mph (slightly better than stock) so I'm not sure what the issue is. Anyone got any suggestions?
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