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Fuel usage
Roger Long wrote:
OK. 30 foot waterline at 5 knots would be a speed length ratio of .91. My boat should be fairly similar in characteristics, heavy but with a modified keel. Look at the graph towards the middle of this page: http://home.maine.rr.com/rlma/StriderFuelSystem.htm Waterline length of my boat is 26 feet so equivelent speed would be 4.64 knots. She reaches that speed at 1560 RPM with 4 POB. Horsepower at that RPM is only 4.2. Displacement is 13,500 pounds or 6.03 Long Tons so .70 HP/ton. Your displacement is 18,000 or 8.03 tons so you need 5.59 HP to go 5 knots. .056 gallons per HP per hour is typical for most diesels so you would burn .31 GPH. This doesn't sound like much but you are talking about a pretty slow speed. At an economical speed length ratio of 1.15, typical cruising speed for most sailboats, 6.3 knots for your boat, you would be burning a bit over twice that. At a speed length ratio of 1.29, flat out, you would be burning about 4 times that. Appreciated! Gordon |
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