Hi everyone, I'm new here.
I have a 33' Aquastar, with twin Perkins
6354 non turbo power units, running through aquadrives.
The boat is just a tad over 9 tonnes, 33 foot on deck
, around 30' at the waterline, 3' draft
, and 10' beam.
are 120hp each, recently serviced, no excessive smoke and sound great.
My problem is that even at around 2000 rpm
I am not getting much more than 8 knots, which I think is pants for the amount of hp.
The trim tabs are set at horizontal, and do not work at the moment, but I still think i should be getting more thrust to play with. The hull
is fair, anti-fouled and I have recently had new replacement props put on her, though I am not sure right now what diameter they are.
I've done a prop calculation and am getting around 24-27 inches (24' ish pitch) for my hp, semi displacement hull
to achieve 15 knots. I cannot believe the props are that large, but will check asap.
In the mean time, does anyone have any ideas?
Many thanks, your help is appreciated.