Enter both values Desired Speed and Displacement speed. These are used in Wymans
formula to calculate estimated power required for the vessel.
See Hull Displacement definition .
This is the maximum speed that you require. Note, there are other factors, such
as safety, not covered by this calculation that would limit desired speed. Contact
the designer manufacturer to find out what the vessels maximum
SL Ratio is.
The results show the estimated required power at the shaft. Note that engines are
rated differently for inboard diesels. For example SHP is approximately 95% of BHP
due to losses in the transmission, to ancillaries etc.
This shows the SHP required for a % of hull speed.