SPORT 13 Fuel Economy - Moderated Discussion Areas

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Author Topic:   SPORT 13 Fuel Economy

Austin Whaler posted 07-18-2008 02:56 AM ET (US)
How many GPH and MPG do you think my 1965 SPORT 13 with 1986 Evinrude 30-HP two-cycle short shaft gets when idling at 4-MPH to 5-MPH? When cruising at 16-MPH to 19-MPH, the slowest possible on plane? When at 30-MPH?
My boat's average load is me (170-lbs), 6-gallons of fuel, about 150-lbs of junk, tools, and the anchor locker filled with fresh water for ballast.
jimh posted 07-18-2008 08:09 AM ET (US)
You can roughly calculate the fuel flow as HP/10-gallons per hour.
jimh posted 07-18-2008 09:24 AM ET (US)
For more discussion of how to calculate the fuel consumption rate of your motor, see:
Brake Specific Fuel Consumption
http://continuouswave.com/ubb/Forum4/HTML/004149.html
jimh posted 07-18-2008 09:33 AM ET (US)
There is no way to calculate your miles-per-gallon fuel economy because you gave no information about the engine speed. You can make an inference of the horsepower being used by comparing the engine speed to the maximum engine speed, and taking that ratio as a rough indicator of the ratio of horsepower used to maximum horsepower rated. In small boats there is enormous influence from other factors, including the hull design, the weight load, the propeller design, and the wind and wave conditions. All of these affect fuel economy.
Tohsgib posted 07-18-2008 10:37 AM ET (US)
Get a 1-gallon jug and run it at those speeds and calculate how long it takes to drain the jug. Better bring a book. My 13 with the same engine would burn roughly one gallon per hour.
goldstem posted 07-18-2008 11:00 AM ET (US)
I think [a 1986 Evinrude 30-0HP ttwo-cycle] is nearly ideal power for the [Boston Whaler SPORT] 13. At WOT I think that motor burns almost 3.5 gallons [3.5-GPH]. At 20-MPH cruise, probably less than 2 [2-GPH]. At idle probably a little under a gallon [less than 1-GPH].
Austin Whaler posted 07-19-2008 02:11 PM ET (US)
Thanks for the replies. I am going to use the gallon jug idea.
jimh posted 07-20-2008 09:39 AM ET (US)
Please elaborate on how you are going to connect a "1-gallon jug" for use as a fuel tank with your motor.
Austin Whaler posted 07-21-2008 02:03 AM ET (US)
use all the gas in my tank and put exactly 1 gallon in it, set my GPS for a new trip log and cruise around in till i run out refill the 12 gallon tank with a small gas can go back to the state pier and fill it up (which is now over $50)
Tohsgib posted 07-21-2008 12:04 PM ET (US)
Atually Jim I just put a gallon of gas in a small jerry can, stick fuel line down the neck of the jug, bungee the jug and away I go. Using a 6 gallon tank will give you a decent idea but may hard to run dry unless propped up so the pickup will get it all out or not prematurely run dry due to the gas sloshing around.

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Author	Topic: SPORT 13 Fuel Economy
Austin Whaler	posted 07-18-2008 02:56 AM ET (US) How many GPH and MPG do you think my 1965 SPORT 13 with 1986 Evinrude 30-HP two-cycle short shaft gets when idling at 4-MPH to 5-MPH? When cruising at 16-MPH to 19-MPH, the slowest possible on plane? When at 30-MPH? My boat's average load is me (170-lbs), 6-gallons of fuel, about 150-lbs of junk, tools, and the anchor locker filled with fresh water for ballast.
jimh	posted 07-18-2008 08:09 AM ET (US) You can roughly calculate the fuel flow as HP/10-gallons per hour.
jimh	posted 07-18-2008 09:24 AM ET (US) For more discussion of how to calculate the fuel consumption rate of your motor, see: Brake Specific Fuel Consumption http://continuouswave.com/ubb/Forum4/HTML/004149.html
jimh	posted 07-18-2008 09:33 AM ET (US) There is no way to calculate your miles-per-gallon fuel economy because you gave no information about the engine speed. You can make an inference of the horsepower being used by comparing the engine speed to the maximum engine speed, and taking that ratio as a rough indicator of the ratio of horsepower used to maximum horsepower rated. In small boats there is enormous influence from other factors, including the hull design, the weight load, the propeller design, and the wind and wave conditions. All of these affect fuel economy.
Tohsgib	posted 07-18-2008 10:37 AM ET (US) Get a 1-gallon jug and run it at those speeds and calculate how long it takes to drain the jug. Better bring a book. My 13 with the same engine would burn roughly one gallon per hour.
goldstem	posted 07-18-2008 11:00 AM ET (US) I think [a 1986 Evinrude 30-0HP ttwo-cycle] is nearly ideal power for the [Boston Whaler SPORT] 13. At WOT I think that motor burns almost 3.5 gallons [3.5-GPH]. At 20-MPH cruise, probably less than 2 [2-GPH]. At idle probably a little under a gallon [less than 1-GPH].
Austin Whaler	posted 07-19-2008 02:11 PM ET (US) Thanks for the replies. I am going to use the gallon jug idea.
jimh	posted 07-20-2008 09:39 AM ET (US) Please elaborate on how you are going to connect a "1-gallon jug" for use as a fuel tank with your motor.
Austin Whaler	posted 07-21-2008 02:03 AM ET (US) use all the gas in my tank and put exactly 1 gallon in it, set my GPS for a new trip log and cruise around in till i run out refill the 12 gallon tank with a small gas can go back to the state pier and fill it up (which is now over $50)
Tohsgib	posted 07-21-2008 12:04 PM ET (US) Atually Jim I just put a gallon of gas in a small jerry can, stick fuel line down the neck of the jug, bungee the jug and away I go. Using a 6 gallon tank will give you a decent idea but may hard to run dry unless propped up so the pickup will get it all out or not prematurely run dry due to the gas sloshing around.