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3000 offshore 4 blade props

Anything related to the operation of your boat that doesn't fit another forum category. Steering, Bilge Pumps, thru-hulls, bottom paint, etc.

Topic author
cpeterip
Junior Member
Posts: 5
Joined: Sun Aug 21, 2011 9:30 pm

3000 offshore 4 blade props

Postby cpeterip » Tue May 21, 2013 8:47 am

We have 19 x 21 props with volvo KAMD 44's and at 1450 rpm before the Supercharger cuts in we are trolling at 7 knots approx .
we need another 1.5 to 2 knots!! Has anyone tried 4 bladed props to achieve this?
We presently cruise at 3400 when we get 21-22 knots and WOT is 3950 but a lower top speed is no problem at all.
All advice welcome.
we tried the cutoff switch - but all we get is black smoke and we are not comfortable with that route!
thanks
Peter

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