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Wayne.B wrote:

On 5 Feb 2005 23:02:46 -0800, wrote:
Don't know about down in your section of the planet, but nobody up here
routinely refers to a
boat with very short range as a "passage maker". I was just guessing
that the range might be 250 nm at 20kt. Bet I'm not all that far off,
though.

===================================

I agree. A boat of that size and weight will typically burn between 2
and 3 gallons of diesel per mile at 20 kts. 1,000 gallons of fuel
would give you a safe working range of 250 to 400 miles. My guess is
that it doesn't even carry that much.

A real "passage maker" as opposed to a coastal cruiser or dock condo
would typically have a working range in excess of 1,000 miles. Most
large sport fishing boats have a range of 400 miles and no one has
ever suggested that they were passage makers.

In reality 20 knots is going to be too uncomfortable and most
longer trips will be at somewhere between 8 and 10 knots, giving
typically between 1 and 2 mpg. Semidisplacement boats can be very
economomic at low speeds.

Having the power available to go faster in calm conditions is
nice to have, but comes a price in terms of the fuel consumption
of a large engine not being optimised for slow running and the need
for regular blasts at full power to blow out the sooting.

--
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