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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