Nomad Willy
Guru
FIFTY PERCENT MORE!!!!
Who would want one?
Does it reduce emissions that much?
Who would want one?
Does it reduce emissions that much?
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Me too. My local Chevron dealer is selling diesel at $3.05 and gas (California summer blend) for $3.75! (The refinery is only 20 miles away.)
Checking our speed tests... 1500/1600/1700 RPMs is in our no man's land, can't plane, mostly plowing. 1800 RPMs is the slowest on-plane speed I tried, and to get there I have to go faster (get properly up on plane) and then pull it back down.
For us, then, 1800 RPMs is approx.13.3 kts and it's still a little "plowy."
I don't have fuel flow scan meters, so can only guess at consumption and economy. The fuel consumption curve suggests 8 GPH per engine, so 16 GPH total, and at 13.3 kts that'd be .88 NMPG.
But the boat is more comfortable at:
- 2000 RPMs, 20.8 GPH, 17.50 kts, .84 NMPG, or
- 2200 RPMs, 26.8 GPH, 20.65 kts, .77 NMPG.
And the hull really performs best -- on plane -- at 2400 RPMs, 34.8 GPH, 23.20 kts, .67 NMPG.
No good news there. We usually run at about 7-8 kts, just below hull speed.
Unless weather and sea states dictate faster speeds, in which case we try 2000, if that doesn't work, 2200, if that doesn't work 2400... or whatever else it takes to make the ride comfortable.
-Chris
Fuel burn data
Boat-1: 36' full keel sailboat (15,500 lbs). 19 year average is 0.5 gph at 6 knots or12 nautical miles per gallon.
Boat-2: 1936 full displacement 33' raised deck cruiser (9,000lbs). 0.35 gph at 6 knots, 0.65 gph at 7 knots, 1 gph at 7.5 knots and 2.3 gph at 9 knots (wide open throttle) for 17.1, 10.7, 7 and 3.9 mpg at the various speeds. I generally run a bit over 6 knots for about 15 mpg.
The powerboat has a longer waterline and narrower beam than the sailboat.
Note that miles in mpg is nautical miles. Add 15% for statute miles.
Art;331195[COLOR=black said:I’d like to learn that TF members estimate they spend annually for diesel engine maintenance/repairs.[/COLOR]
I have several friends who will pretty much only use diesel engines in their land and boating vehicles. They have mentioned some fairly amazing annual costs. I’d like to learn that TF members estimate they spend annually for diesel engine maintenance/repairs.
Two diesels, so per year is 24 quarts of oil, two oil filters, two Racor 500 filter elements. Don't know how much that totals up to be but in the overall scheme of things it's pretty much free.
Repairs is harder to figure because most years nothing breaks.