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1. 04:51 AM - 447 tuning tips (Richard Girard)
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Mike, John, all, I regret leaving out HP when I said the engine must reach
full RPM. Look at the graphs in the operators manual and you see that the
engine develops its peak HP at 6500 RPM and this is what must be achieved at
WOT, not 6800 RPM as Mike interpreted my remarks. This is also reflected in
SI 3UL - 89E. The graphs here are directed at various problems that occur
when the prop is not matched to the engine so that it reaches "nominal RPM"
at WOT.Back to the graphs in the Operation Manual. John says he is getting
6100 RPM WOT in level flight. I would guess he is seeing 5700 to 5800 RPM
in climb. This represents an 8 to 10 per cent loss of horsepower. Why on
earth would you want to tune for that? Sort of like running the engine with
one arm tied behind its back :-}
John, I've never had dealings with Ronnie Smith at South Mississippi Light
Aircraft but he comes highly recommended by John H and others here on the
list. Give him a call and describe your symptoms. I'll bet you a quarter
he'll tell you your prop pitch is too steep.
Rick
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