Propeller HP

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

PHP = C x (RPM exp N)

C = sum matching constant

N = 3.0 for heavy/slow, 2.7 normal, 2.2 ducted props.

6.00E-08

 C

2000

 max RPM

3.0

 N

8.00E+09

 RPM exp N

480

 Prop HP