Thoddy wrote:
Quote:
say
ship wit one screw and 50000 PS will do 30 kn
how much PS will be required to achieve the same speed with two screws
exact values are not required but some kind of a approximative value would be fine.
I found a german statement of th K-Amt wich state -according to own experiments-
that-
Propellerefficiency of a 3-screws ships was 0.48
and in the case of a 4-screws ship it was only 0.42
so the 3-screws ships requires less HP (about 15 percent) to achieve a given speed
they found no way to increase the efficiency of a 4 screw ship significantly.