VolvoPenta DPS DuoProp

[Tafflad]

Does anybody have a guide or link as to how VP. DuoProp sets relate to pitch.

The on-line Volvo propellor guide only mentions pitch on single props.

https://www.volvopenta.com/content/...r-owners/parts/propellers/Propeller Guide.pdf

My new boat is not operating in correct rpm band, if it were a single prop I would drop the pitch by 2” ....to raise rpm by 200, that would put it mid- point of WOT band.

There is a link mentioned in a previous post

Duoprop propellers
but the link goes to a ‘ forbidden page’

 

[BruceK]

Props are a dark art and duo props the darkest of the lot. I've been researching that for 5 years without success. Best advice I can give is find out what the manufacturers of your boat fitted and then if necessary, chase down why you have lost hp and remedy that. I found the jump between prop sizes in the C and separately B types was just shy of 400 rpm on my boat. Whether that was due to pitch alone or simply loss of torque I cannot say but fine tuning by changing size does not appear to be an option. (B4 to B5 and C3 to C4)