Well it's nice to have a little extra in the auxiliary propulsion system when steaming into a sea and a strong headwind...the M4-30 and 3 blade Autoprop on my 35 MKII handles that very well... the M4-30 lower sweet spot is at 15-1600 rpm sends us along at 5 to 5.5 kts by gps with minimal motor noise which is really nice for motor cruising around the coves with friends along.
Dwight Veinot C&C 35 MKII, *Alianna* Head of St. Margaret's Bay, NS d.ve...@bellaliant.net On Tue, Jul 14, 2015 at 1:39 PM, PME via CnC-List <cnc-list@cnc-list.com> wrote: > 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 > > > > > > - > 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 > > > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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