It is hard to say but a dirty bottom CAN be that big of an effect.

Josh
On Aug 15, 2014 6:20 PM, "Paul Baker via CnC-List" <cnc-list@cnc-list.com>
wrote:

> Hi Folks,
> Any 27MkII folks out there with a Yanmar 1GM10 diesel?  What prop do you
> have on there, and is it able to achieve max rpm under load?  I can't
> recall what I have (3 blade but don't know size/pitch) but at 2700rpm I am
> billowing black smoke and still only doing 5kts.  Dirty bottom is going to
> contribute to this, plus some junk on the prop itself, but I wouldn't have
> thought it would be *that* big an effect.
> Cheers,
> Paul
>
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