I would like to make two points:
- This is "theoretical max speed" (with the emphasis on the _theoretical_);
this means (among others) that in practice, it can be different. The other
thing is that it only means that if you want to go faster, substantially higher
force (pushing you forward) is required or that the drag grows substantially
above that speed (in short, this is the point where the function goes
non-linear). In practice this means that quite often you can beat your hull
speed by a small margin.
- the GPS speed is over the bottom; the hull speed is in the water; they may
differ significantly due to drift, current and all other factors that make your
boat move not exactly in the direction you want it.
Marek, in Ottawa
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