Next message: Robin Brueckner: "T&T: Fuel Usage..hulls, engines"
Archimedes is right - displaced water is the same. But the amount of wetted
surface is not and this has an impact on friction (hence power required to
sustain motion). As someone said, at slower speeds friction is the prevailing
drag, not bow wave creation.
Also, I second the comment made about tide. The slower you go (for fuel
savings), the more of an impact a seemingly trivial 1 knot of tide has on you.
A 20 knot boat is essentially unaffected, but a 6 knot boat has a 17% impact.
The coarse rule of thumb in flying is to pour the coal to her in headwinds
and throttle back in following wind.
Re tide - I downloaded Maptech charts onto my laptop and they link to tide
tables. They will actually show (I'm only talking ICW here- don't know about
other locations) tide current in real time. Very nice feature. You can be
clever and set the computer clock for the time you think you'll be at the
location in question and see which way the tide will flow. Good stuff if you are
that structured/organized/anal. I only did it once - too much work...
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