fuel are you kidding me

Dave, those numbers are per engine, multiply by two for your twins.
 
quote:
Originally posted by HOGAN

Dave, those numbers are per engine, multiply by two for your twins.

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Hogan tell me maybe you do math differently then me but last I checked 10.4 x 2 = 20.8
and 13.4 x 2 = 26.8 I said I cruise at between these numbers and total average is 20 why is this so hard to comprehend? My numbers include the idle time and low speed to channel not 6 hours of idle as you suggest. With a 432 gallon tank I have no need to travel from fuel station to fuel station it usually take me more than a day to burn through that much fuel. I'm sorry if you burn so much more then me that this seems incomprehensible. Check out John's post He is doing better then me. If I could take out the tape measure and show you I would but this isn't that cut and dry. The numbers that Bob posted really show what I have been saying it is not disproving in any way. I'm not trying to fight over this but I sense a condescending tone from the above comments as if I don't have a clue, I would expect this on another forum not here.

I'm sorry I'm feeling a bit stressed out these days I guess I'm a little sensitive as well.
 
John I just noticed your post 240 gallons for 18 hours is only 13.3 per hour is this per motor? this seems way to low? The lowest I have ever seen with mostly low speed cruising was 16.9 total. If you did better then that I'm impressed, but then you haven't moved into you boat yet so you are traveling light. When you load it up with everything you need or want these numbers will change a bit. Did you travel with a full tank of water? 100 gallons is 834 lbs it adds up.
 
Bob I have a question as to those numbers are they calculated with a load on the motor? This could make the actual numbers higher or lower depending on workload. My point is there is room for both up and down in those numbers but they seem pretty close best I can tell.
 
"Frankly, my dear, I don't give a damn"

just go and enjoy your boat
 
quote:
Originally posted by walterv

quote:
Originally posted by Starry Night

Maybe Dave forgot he has two engines? LOL

Cat 3126's 420hp burn
8.1 at 2000rpm
10.4 at 2200rpm
13.4 at 2400rpm
17.4 at 2600rpm
23.2 at 2800rpm

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Bob those are good numbers (fuel burn) what is WOT and the fuel burn and speed? Just curious, no hidden agenda.

I was very impressed with the 42 Silverton fuel burn, not math, but measured, 27 gal per hour at 25 knots

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These numbers are straight from Cat's spec with prop demand curve.
If WOT then the numbers go up.
 
tough crowd - ever notice that as the cost of fuel goes up, the trips get shorter, time on the hook extends, and the booz consumption goes up? Has anyone ever done the math to see if this is proportionate consumption and if the dollars (assume $5/gal for gas and $18/gallon for rum or vodka)end up being the same?

yes I'm kidding
 
O
And then there is which puts more smiles per gallon?
Tough call
 
Dave - I may be off on one number or the other. I do know it was less than 300 gallons. And less than 21 hours. We arrive MD tomorrow and I should be able to post from the log by the end of the weekend.
 
quote:
Originally posted by Audrey II

At 2400rpms I'm comfortably going 20knts I usually set my GPS for MPH which is usually 25-26 as high as 28 with tides and wind in my favor.

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20 knots = 23.066 MPH not 25 or 26.

Figuring 26.8gph burn at 2400rpm 23.066 mph puts you at 1.16 gallons per mile.

26.8 / 23.066 = 1.16

If you plan trips you should really use 1.16 gpm IMHO.

When is it going to warm up????
 
I do between 20 and 22 Knots but I really don't keep it set to knots I set it to MPH and at 2350 I'm going any where for 24-26 mph. As for MPG this would be base on actual gallons burned to GPS distanced traveled and I have also tried to use plotted distance traveled it is a bit harder to calculate this number but the average no matter how I calculate falls fairly consistently at .9 MPH so 1.16 gallons per mile seems pretty close with a little wiggle room. Also keep in mind at 2350 the burn rate must be about 11.6 x 2 which is more like 23.2 per hour, this seems right in line with what I have been saying. Add in the idle time out to channel and I'm at or under 20 GPH. I stand by these numbers and I'm happy with them. I go a little faster then you figured but close this said the numbers I have been saying for the last two years seems to be backed by the data provided here. I have been all but called stupid about this but the numbers seem to be right in line with what I've been saying.
 
Dave,
I agree with Jonathan on these numbers. This is what you should be using when planning trips and what your true burn rate is, not your average.

I think the point here is that when we all talk burn rate, it is what the manufacturers provide your engines to burn at the optimum cruising rpm's without lugging the motors.

When you state that your engines burn on average 20 gls per hour it sound like your engines burn 20gls an hour at cruising rpm's all day long. Your engines burn 25-27gls per hour at 2350-2400 if that is your cruising speed.

My volvo's with twin 480hp burn 34-36gls per hour at 2350-2380rpm's cruising at 27-28mph and my WOT is 2600. This is what I use when planning my trips.
 
You are burning more than he is. You come to 1.259 - 1.286 GPM.

You are running only 230-250 rpms off the top? Cat recommends 300-400 off the top rpm. What does Volvo recommend for cruise rpm?

My 660's burn 42 gallons going 26 knots (30 mph), I top out at about 2340 per, motor is rated for 2300. So I get 1.4 GPM but I am pushing 50,000# loaded with fuel and water.

Fillng up last year is looking like a bargain compared to what's coming............
 
I'm empty I plan to fill ASAP I may call and have a truck deliver my first tank before I launch. I have a few friends that are all looking to do the same. I did this two years ago but last year there wasn't a big enough saving to make it worth while. I'm thinking if I fill within the next week or two I may beat some of the increase from the run away pricing.
 
Dave if you feel now you only save about 200 dollars if the price goes up 50 centS. Minus of course whatever they charge to deliver
 
The delivered price is cheaper then on the water and $200 is $200 better in my pocket then someone else.
 
We cut back on other things, not boating, eating or drinking.
We have no kids, we like to have fun.
We don't want to die with money in the bank.
 
23-24 Knots burning 12.5 GPH each
WOT 30 Knots burning 18.5 GPH each Floscans
 
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