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Old 04-09-2015, 16:59   #31
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Re: Curriosity. What is a cat's MPG?

i have an older solaris 42 very heavy with very old 5o hp yanmars but not many hours on them in good conditions at 18oo to 2000 rmp one motor i am at 3.5 to 4.2 knots 3/4 gal per hour fuel .. both motors at 1600 i run 5.2 to 5.6 double the consumption ,, but the wind and the current effect my mileage greatly having a very large profile
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Old 05-09-2015, 02:17   #32
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Re: Curriosity. What is a cat's MPG?

This was sent to me by a fellow Lagoon owner and may help for a Lagoon 450.


SV TOT 😃
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Old 05-09-2015, 03:59   #33
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Re: Curriosity. What is a cat's MPG?

Quote:
Originally Posted by TOT View Post
This was sent to me by a fellow Lagoon owner and may help for a Lagoon 450.
That looks like Twixter's spreadsheet (Lagoon 440s2).

It used to be on their excellent blog site which is sadly no more.
I've attached a copy for those interested.
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Old 05-09-2015, 07:57   #34
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Re: Curriosity. What is a cat's MPG?

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It does not make just as much sense as in a car. A car is little affected by current Wind is apples and oranges. If you can figure out your mileage on a particular trip from gph great.
If you say so. Of course, pulling my 5th wheel I have ranged from 8mpg to 16mpg depending on the wind. While there are some differences from current, that seems pretty substantial. I still generally assume around 12mpg and leave a decent margin for error.

Of course most people I know have no clue how many gallons they are from their destination (not that even makes sense). They do typically know how many miles. People talking in gal/hr are indirectly making the MPG calculation based on an assume cruising speed. In either case wind and current and sea state must be accounted for.

If gal/hr makes you happy, go for it but I stand by my original point that MPG makes perfectly good sense.
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Old 05-09-2015, 08:05   #35
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Re: Curriosity. What is a cat's MPG?

Need to know how much fuel to carry in order to meet the range required?

An easy calculation is:


For petrol engines fuel consumption can be estimated as:

Litres/hr = 0.508 x KWprop

For diesel engines fuel consumption can be estimated as:

Litres/hr = 0.274 x KWprop



Where: KWprop = Kilowatts from propeller power curve


example

215 g/kWh x 100kW = 21500 g/h or 21.500 kg/h

0.85 kg/l is a typical figure for diesel

21.500 kg/h : 1 L/0.85 kg = 25.3 L/h
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Old 05-09-2015, 20:31   #36
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Re: Curriosity. What is a cat's MPG?

Thanks for all the data.
Very interesting.
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Old 06-09-2015, 06:54   #37
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Re: Curriosity. What is a cat's MPG?

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