| Propeller HP | How To | ||||||||
| 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 | ||||||||
| 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 | |||||||||