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Boat Speed
What speed is the boat making at WOT? Typically, over-propped direct drive A4s will get a boat up to hull speed but the RPM will be in the range you are finding. Such a setup is hard on the engine as it is working quite hard at that RPM to develop the HP needed to make hull speed. It is kind of like driving uphill in 5th gear ... your are making it up the hill but you are "lugging" the engine.
A bigger problem comes into play when you hit bad weather, i.e. heavy waves and/or a lot of wind on your nose. You find that you do not have any reserve power available to such a situation.
Tom Stevens
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