Best AnswerVoter's Choice
- Capt. John answered 3 years ago
True... all boats burn so much gas
it is measured in gallons per hour and not gallons per mile. To a large degree
however, the type and size of your boat as well as the type of hull and size of
it's engine (or engines) can make a huge difference.
While a small fishing boat with a small outboard will typically burn less then 2 gallons an hour, 20 foot runabouts and open bow boats might burn 5 gallons an hour, and your ski boats and medium size cruisers (26' and under) will burn about 10 gallons an hour. Above that, your getting into the real gas guzzlers... 28' foot and larger twin screw (or twin engine) cruisers can easily burn 30, 40 or more gallons an hour. Many 36 footers and up will have 300 gallon fuel tanks, and they will burn it all in an average day just cruising around.
But you can sail around the world in a sailboat on $75.00 worth of fuel for your auxiliary engine.
Happy & Safe Boating,
John
While a small fishing boat with a small outboard will typically burn less then 2 gallons an hour, 20 foot runabouts and open bow boats might burn 5 gallons an hour, and your ski boats and medium size cruisers (26' and under) will burn about 10 gallons an hour. Above that, your getting into the real gas guzzlers... 28' foot and larger twin screw (or twin engine) cruisers can easily burn 30, 40 or more gallons an hour. Many 36 footers and up will have 300 gallon fuel tanks, and they will burn it all in an average day just cruising around.
But you can sail around the world in a sailboat on $75.00 worth of fuel for your auxiliary engine.
Happy & Safe Boating,
John
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Multiply the HP by 0.10 for a gasoline boat engine to
estimate the fuel consumption. According to Boat Safe, "Gasoline four
stroke inboard engines need about 1 gallon per hour for every 10 hp used."
Divide by 10 instead, if you like.
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· Multiply the number of intended passengers by
170. Add this number to the weight of the boat. Include the weight of the hull,
motor, fuel and safety
equipment. The total is your working displacement.
· 2
Divide the total displacement by the horsepower
of the motor you want to use.
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· 3
Divide the drag coefficient for a single hull (180) by the
square root of the answer to Step 2. The answer is the approximate speed in
statute miles.
· 4
Multiply the answer by 0.869 to get your speed in knots.
Example: Total displacement = 2,500 lbs, horsepower = 75
2,500/75 = 33
Square root of 33 = 5.77
180/5.55 = 31 mph
31 * .869 = 27 knots
2,500/75 = 33
Square root of 33 = 5.77
180/5.55 = 31 mph
31 * .869 = 27 knots
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