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Old 10-08-2015, 10:16 AM   #18
caltexflanc
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City: North Carolina for now
Join Date: Aug 2011
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Quote:
Trying to determine if a fast boat can economically (fuel wise and part wise) operate at slow speeds is rather hard.
No, it's not hard. But first you need to define what "economically" means. Some depends on the engines, a lot depends on the boat.

My big fat Hatteras was designed to run on "plane", (theoretically about 14 knots) but we virtually never did. 8-9 knots wuz us. We ran it up at the end of the typical day for about 10 or 15 minutes. Engines surveyed out beautifully after 2000+ hours of running that way. I know a lot of other Hatteras MY owners, and all but one run it the way I described.

Sunchaser described the whole turbo issue quite well. You could subscribe to boat diesel.com for more detailed info.
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