75 vs 100 HP Engines?
Posted: Wed Jan 19, 2005 6:54 pm
We're just back from a Sunsail M/V 34 charter in Florida. (We loved our 4 1/2 days aboard). Our Sunsail boat, with its keel shoe, cruised at about 14 kts at 3250 rpm. We used 74 gallons of fuel to go 225 miles - which works out to 3 mi/gal; we burned about 3.5 gal/hr.
As we will soon be making option choices on our new boat ("Sno' Dog"), we're looking for some feedback on the engine question. So far, there's nothing on the PDQ website about the larger engines. Being an engineer, I've looked at the Yanmar curves and concluded that the 100-hp engine can produce the same power as the 75 at a lower RPM and at slightly less fuel consumption. But I suspect any possible saving would quickly disappear due to the human tendency to "use what you got" and so run faster and therefore burn more fuel. There seems to be lots of anecdotal info that folks are averaging around 4 gal/hr with the 75-hp engines. I'm wondering if anyone out there has got any data on the 100 hp version? Also, what speeds are you typically seeing?
Henry - in cold, frozen New Hampshire
As we will soon be making option choices on our new boat ("Sno' Dog"), we're looking for some feedback on the engine question. So far, there's nothing on the PDQ website about the larger engines. Being an engineer, I've looked at the Yanmar curves and concluded that the 100-hp engine can produce the same power as the 75 at a lower RPM and at slightly less fuel consumption. But I suspect any possible saving would quickly disappear due to the human tendency to "use what you got" and so run faster and therefore burn more fuel. There seems to be lots of anecdotal info that folks are averaging around 4 gal/hr with the 75-hp engines. I'm wondering if anyone out there has got any data on the 100 hp version? Also, what speeds are you typically seeing?
Henry - in cold, frozen New Hampshire