CD31 CRUISING RANGE UNDER POWER

[RUSSELL JOHNSON]

ANY IDEA ON THE GALLONS PER HOUR FOR THE CD31 @ 1800 RPM +-



rajarch@dellnet.com

[Larry DeMers]

Welll, if you remember to top off the tank before leaving <ahemmm..a crucial little item that I put off until it dropped off my memory plate last year. Arrived after 15hrs of motoring in thick fog,and marina was not selling fuel at all any more, but would again in a few weeks! ugh)
My CD30 has the Volvo MD7B, recently rebuilt and kept in excellent tune. I had allowed for .5gal/hr at 2000 rpm (5.3kts), but over that period, we used only .23 gal/hr. This surprised me a bit, but that seems to be the rate of burn regardless of time of year or loading of boat.

Your mileage will vary, but it will be in the <.5gal/hr range I will bet.

Larry DeMers
s/v DeLaMer
Cape Dory 30

ANY IDEA ON THE GALLONS PER HOUR FOR THE CD31 @ 1800 RPM +-

demers@sgi.com

[Tom]

ANY IDEA ON THE GALLONS PER HOUR FOR THE CD31 @ 1800 RPM +-

Russell, You didn't mention which brand of engine you have, but I have the Universal 3 cylinder model 25 in my 31. I have the Alberg designed 31 with the full keel and not the other 31 that's been mentnioned on the board here. At 1800 rpm I use around .3 gallons per hour and I'm loaded with extra gear -- water maker, refrigeration, Monitor, 200 feet 5/16 BBB chain, hard dodger, 4 anchors etc.

I used to run mine at 1800 rpm which as you know is the top of the power curve, but I've taken to running more rpms because I didn't think the engine was running hot enough. Now I run at 2,000 to 2200 rpm which brings the temp up to the 140 degree temp specified. At that rpm I use about .4 gals per hour.

With a 20 gallon tank that gives you 50 to 65 hours or basically a whole week of running in daylight hours. When I cruise in areas where the fueling stations are far apart, i.e., Mexico, I take a couple of 6 gallon jerry jugs along which gives you over 100 hours of run time, expecially if you throttle back to maximize fuel economy. Hopefully you will be able to sail at least some of the time which extends your cruising range even more in terms of time. Hope this helps.



TomCambria@mindspring.com