[C320-list] Used Boat Review

[Andrew Santangelo]

Adam,

The maximum hull speed for the C320 is approximately 7.2 - 7.4 knots  
depending on application of the formula.  The formula for Hull speed  
is given as v = K * Sq. Root of LWL, where K is 1.34 - 1.51 kt-ft**- 
(1/2).  Hence this will give a theoretical hull speed of the C320  
between 7.1 - 8.0 kts.

With the fixed 3 blade prop I was getting consistently 7.2 knots at  
3,000 RPM on calm waters in Lake Macatawa.  This compared well with  
the GPS and the calibrated knot meter.  When I went to the Autoprop I  
achieved 7.4 knots at 2,500 RPM with a clean hull, however 7.2 - 7.3  
was more consistent.

Now have I gone faster?  Yes.  Twice using the Spinnaker broad  
reaching in strong winds - 13.2 knots and another time around 11  
knots.  A very wild ride.

I have also drifted backwards too - very dreadful!

But I stand by that 6 knots at 3,000 RPM - not good if this is the  
standard performance.

Best Regards,
Andrew
C320 Dawn Treader




On Apr 27, 2009, at 5:53 PM, Chef Adam Weiner wrote:

> Andrew, it is amazing how well your boat beats maximum hull speed.
>
> I one time sailed my boat for over an hour at 13.1 knots at 0 RPM's.
> (Six knots of current.)  Don't ask me what happened when I tried to  
> turn
> around.
>
> Heck, there have been quite a few times motoring the Brisbane/Oyster  
> Cover
> channel that at 3000 RPM's I was going backwards.
>
> Adam