markpierce
Master and Commander
- Joined
- Sep 25, 2010
- Messages
- 12,557
- Location
- USA
- Vessel Name
- Carquinez Coot
- Vessel Make
- penultimate Seahorse Marine Coot hull #6
Always like the parts in movies where the ship's telegraph goes "clang, clang" ordering and acknowledging engine changes. Old-time merchant ships typically had dead slow, slow, half, and full speed settings while military types had one-third, two-thirds, standard, full, and flank speeds. ...
For what it's worth, here are mine:
800 RPM: idle, dead slow, one-third. Used when shifting the transmission and, usually with periods of neutral, close-in maneuvering. [3.3 knots @ 0.4 gallons of fuel per hour]
1000 RPM: no wake. [4.2 knots @ 0.6 gph]
1400-1600 RPM: slow, two-thirds (easy cruise). Use when a higher speed will get me there too soon. [5.7-6.0 knots @ 1.2-1.5 gph]
1800 RPM: standard (normal cruise). Engine sounds happiest, and this is the setting used 80 percent of the time. [6.4 knots @ 1.7 gph]
2200 RPM: full speed (hard cruise). Used when the most speed is important or fighting a strong adverse current. [7.1 knots @ 2.9 gph]
2400 RPM: flank speed, wide-open throttle. Used only for testing. [7.4 knots @ 4.0 gph]
Boat weighs 14 tons, has a 31.6-foot waterline, and about a 12-foot beam at waterline. Engine is a normally-aspirated John Deere 4045, 80-horsepower diesel engine.
For what it's worth, here are mine:
800 RPM: idle, dead slow, one-third. Used when shifting the transmission and, usually with periods of neutral, close-in maneuvering. [3.3 knots @ 0.4 gallons of fuel per hour]
1000 RPM: no wake. [4.2 knots @ 0.6 gph]
1400-1600 RPM: slow, two-thirds (easy cruise). Use when a higher speed will get me there too soon. [5.7-6.0 knots @ 1.2-1.5 gph]
1800 RPM: standard (normal cruise). Engine sounds happiest, and this is the setting used 80 percent of the time. [6.4 knots @ 1.7 gph]
2200 RPM: full speed (hard cruise). Used when the most speed is important or fighting a strong adverse current. [7.1 knots @ 2.9 gph]
2400 RPM: flank speed, wide-open throttle. Used only for testing. [7.4 knots @ 4.0 gph]
Boat weighs 14 tons, has a 31.6-foot waterline, and about a 12-foot beam at waterline. Engine is a normally-aspirated John Deere 4045, 80-horsepower diesel engine.
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