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Here is a link to a STATIC performance calculator that
seems to at least give reasonable results
I could turn 5800 rpm static when my prop was 76x88 which
this calculator indicates the engine was producing 168.1 HP to turn the prop
2035 rpm
When I trimmed the prop back to 74x88 I picked up 200
static engine rpm which this calculator then indicated the engine was
producing167.2 HP to turn the prop 2105 rpm
So between 165 and 170 HP seems reasonable.
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