I don't have a tach installed, but do have an optical tach, and reflective tape on the crank pulley and drive shaft (so I could confirm the trans ratio is 2.5:1). Most of the time I run around 2000 rpm I would guess (keep forgetting to check), but this last fill including several hours into 35+ and 2-3knots of current, so it could easily have burned a lot more than usual. The wind was so loud I couldn't hear the engine, so I was just keeping an eye on the temp gauge...
It's a VW 1.6L 4 cyl diesel (early Golf/Jetta vintage), which is 48-52hp, so far more power than required. I could probably go with a 3:1 or higher transmission, but then there is the risk of turning the prop too fast (maybe this isn't a problem?), since the engine has ample power for the boat below 2000rpm, but it will also happily run at 4000rpm all day long (not that I'd want to, it's noisy and less efficient, but max rpm is 5200). We had a nice easy return trip yesterday, motoring about half of the way, but going with the current, so just light throttle gave me ~6 knots SOG. I will try to keep the engine at a moderate RPM until the next fuel top up so I can get a better idea of typical consumption. Thanks! -- Shawn Wright [email protected] S/V Callisto, 1974 C&C 35 https://www.facebook.com/SVCallisto On Sun, Jul 7, 2019 at 6:37 PM Andrew Burton via CnC-List < [email protected]> wrote: > Interesting...curious to know what rpm you're running at to be burning a > gallon an hour. I run my 75 hp Yanmar 4JH turbo at about 2200-2400 and seem > to get around .75 an hour on the 47 footer. > Andy > > Andrew Burton > 139 Tuckerman Ave > Middletown, RI > USA 02842 > > www.burtonsailing.com > http://sites.google.com/site/andrewburtonyachtservices/ > +401 965-5260 > > On Jul 7, 2019, at 20:20, Josh Muckley via CnC-List <[email protected]> > wrote: > > My American conversion says that 42 liters is roughly 10 gallons. I > typically plan for 1 gallon per hour so your suspect 15 hour gage seems to > be right on the money. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > > On Sun, Jul 7, 2019, 7:47 PM Shawn Wright via CnC-List < > [email protected]> wrote: > >> Tonight I'm planning to sail Callisto from Mill Bay back to Esquimalt, >> with an overnight at Sidney Spit, and hoping for better conditions than the >> on-the-nose 35+ knots we had a few weeks ago. Forecast is for light >> increasing to 10-15 Monday tomorrow afternoon, which will likely still be >> on-the-nose, but at least should be a bit more comfortable. Just in case, I >> now have a second reef ready to go, and my friend from Japan is along for >> the ride, so it should be fun. >> >> We filled up with fuel this morning, and I was a bit surprised to learn >> that we used 42 liters since that trip. I suspect 3 hours of motoring into >> the current and wind used more than the normal amount of fuel, as total >> hours was only about 15. (although hour meter is also suspect - it seemed >> to be stuck for a while...) >> -- >> Shawn Wright >> [email protected] >> S/V Callisto, 1974 C&C 35 >> https://www.facebook.com/SVCallisto >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
