mistercomputerman
Well-Known Member
- Jan 6, 2008
- 4,321
- Boat Info
- 410 Sundancer - 2001
- Engines
- Twin 8.1L Mercruisers - 2009
Damned 410 diesel comedians...
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Rick, You must be one of those damn 1%'ers.....
I just topped off my tanks about a half hour ago. I ran 179.5 miles in 18.2 hours since 6-6-12. approximately 80 of those miles were on plane in the Atlantic Ocean to/from the LL Rendezvous. I'd guess 50 or so of the remaining 100 miles were on plane and the other 50 were at or below hull speed. I took on 170.2 Gallons. That's 1.06 sMPG and 9.35 GPH.....all numbers are "AVERAGE"...I don't have flo-scans.
I ran 700+ miles to NY and back and put $4500 on my credit card. That is an average $6.43 per mile just to come and see youse guys...how 'bout them numbers?
What RPM and speed did you cruise at? I have been told that gassers' sweet spot is where the dyno HP and Torque curves intersect, but don't know this for fact.
First 161sm was on plane @ 3200rpm, 28mph - from ......
.....Third tank was mostly 2100rpm, 24mph........
(NOTE: All generator consumption is removed from these figures by filling port tank first, starboard second, and using 2x port consumption. The generator appears to burn about 1.5gph and we have run it more than usual as we have only had shore power three nights and house (starboard) batteries are 3yrs old and not lasting through the night with a 12yr old refrigerator that runs too much to stay marginally cold.
Mark, assuming your genny is healthy, that burn estimate is WAY high - even under max load, which is hard to maintain on a 410. (AC's and WH cycle off, and there's just not much for it to power)
I'll assume the 3200 is a typ and you meant 2200rpm....if not...something is broke.
Unless you are running with a strong current and a strong tail wind and very lightly loaded......there is NO WAY you are making 28mph/24knots at only 2200 RPMs.
On a typical long cruise like you are taking you will be running very heavy...fuel, water, stuff
Either your tachs are off or your props are way overloading the motors.
BTW....from 'here' |...................| to 'here' is not 7 inches....
We have been running it sparingly, as Isle Royale has specific rules about noise. When it is running, there is a very significant load, as batteries are charging, hair dryers are on (wife - i have no hair , water is heating for showers. We use the 'ON' time to the max, then shut it down. My figures are estimates I haven't been recording and calculatiing, but will now to see what the real numbers are.
I'm sure it doesn't seem like it when a hair dryer is screaming incessantly, but that's only about half-load!
My gas Westerbeke is rated to burn just over a 1 GPH at full load, but the only way to run 'er for an hour with a full load, is if I'm specifically trying to do so. That would require running hot water, using the stove, both AC's set to an extreme temp, all lights and charger on etc.
Yours, with the load described above, will be a whole lot less.
Agreed. We went back over usage at each dock, dinner, morning, etc. and came up with a GPH burn of about .7gph. Not bad for what utility you get out of each gallon, in the way of hot showers, refrigerated food, hot food, lights, AC, etc....oh and my wife's hair.
Exactly what I found. My 380 was dialed in nicely toward the end of my ownership and it burned 26-27 GPH @ 2400 (24 kts) per Floscans.
Wow. I am pretty sure I could run my 410 at WOT/32mph and never get to those burn rate numbers. What gives???
First 161sm was on plane @ 2300rpm, 28mph - from Bayfield WI to Rock Harbor, Isle Royale MI in a respectable 5.45hrs. Filled with 162 gallons for almost exactly 1mpg at 28gph, 28mph averages. After clearing sailboat traffic at Outer Island, I set the autopilot and did not touch wheel or throttles for 5hrs...fun!