Note that this is of use only in producing charts for easy visualisation of engine / propeller power curves. As can be seen from the formula it is based on the relationships between shaft RPM, type of propeller installation and
a theoretical constant.
It takes no account whatsoever of hull type etc.
It should only be used for creating charts
Formula
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PHP = C x (RPM exp N)
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C = sum matching constant
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N = 3.0 for heavy/slow, 2.7 normal, 2.2 ducted props.
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6.00E-08
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C
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2000
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max RPM
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3.0
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N
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8.00E+09
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RPM exp N
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480
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Prop HP
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