Join Date: Sep 2003
Location: Auckland New Zealand
Thanked 34 Times in 31 Posts
Rep Power: 13
The end of your inserted article probably holds the clue - I reckon your prop has something wrapped around it. That would account for the lower than normal RPM, the lack of smoke when revving free, the rapid fall-off in speed at a lower RPM as well of course as the black smoke.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke