props size - help please
 

Hello;


We have boat with next datas:

- weight 12.000 lb
- lenght 30 ft
- 2x diesel 275 hp each and 3.300 rpm wot
- Arneson 6" drives
- drop down with 1,2 reduction


What kind of props with what dimensions to put on shafts for best results?




bye
Saso

20 pitch prop will take you to 45 mph at 3300 with 15% slip. Diameter is dependent. Start big (16.5"-17" ???) you can always cut it down. You may need a custom propeller to find this size.
HP to weight ratio suggests you should be able to do this pitch. Of course this is without knowing the boats configuration.

Brett