Hi,

There is a nice web calculator for calculating hull speed, a displacement 
corrected hull speed (Gerr), and horsepower dependence on speed.

It shows for the LF38, a Gerr hull speed of 7.22 Knots and required 35.5 HP to 
reach 100% of max hull speed.   It is interesting to note that 90% of hull 
speed is expected to be achieved with under 24 HP.


http://www.psychosnail.com/boatspeedcalculator.aspx 
<http://www.psychosnail.com/boatspeedcalculator.aspx>





-
Paul E.
1981 C&C Landfall 38
S/V Johanna Rose
Carrabelle, FL




> On Jul 14, 2015, at 12:00 PM, cnc-list-requ...@cnc-list.com wrote:
> 
> 
> HI Brian
> 
> Our 34 has the Yanmar 3GM with Martec folding prop.  Clean bottom cruising
> is 5.5, max is about 6.  As I recall, your max speed is supposed to be
> about
> 80% of theoretical hull speed with throttle wide open??  Another variable
> is
> the calibration of the knotometer and if using the GPS the impact of
> current
> 
> 
> John and Maryann
> Legacy III
> 1982 C&C 34
> Noank, CT
> 

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