tcm
...
law of physics, cap\'n
look, it can't be "easier" to go fast than slow, can it? Otherwise yerd break the laws of physics, captain. Withh a given small amount of fuel entering the engine would then travel at the easiest possible speed which (if it was really fabbest mpg at 15 knots) would be 15knots - the slowest and easiest speed. "Easiness" is measured by how much fuel is burned - Essentially, the faster you go, the harder it is, so the more fuel burned. Splishing and sploshing water all over as when on the plane uses loads of energy, so not doing that must use less, or much less. There are issues regarding efficiency of engine, but these are tiny relative to the very difficult process of getting a boat goping through water, not easy at all.
Not at all sure that resitance to fwd motions is a function of velocity CUBED (otherwise a boat wd use 64 times as much at 40 knots as at 10 knots) and reynold's number is dependent only upon a single power of velocity.
but anyway, the slower the cheaper imho, within limits of 1-10 knots depending on engine, prop etc etc.
The royal navy speed limit is 12knots to save fuel.
I don't believe that a boat tester has the time or budget to perform extensive fuel mpg tests which in reality would take days and days for repeatability and accuracy, but will happily learn otherwise. Kim?
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look, it can't be "easier" to go fast than slow, can it? Otherwise yerd break the laws of physics, captain. Withh a given small amount of fuel entering the engine would then travel at the easiest possible speed which (if it was really fabbest mpg at 15 knots) would be 15knots - the slowest and easiest speed. "Easiness" is measured by how much fuel is burned - Essentially, the faster you go, the harder it is, so the more fuel burned. Splishing and sploshing water all over as when on the plane uses loads of energy, so not doing that must use less, or much less. There are issues regarding efficiency of engine, but these are tiny relative to the very difficult process of getting a boat goping through water, not easy at all.
Not at all sure that resitance to fwd motions is a function of velocity CUBED (otherwise a boat wd use 64 times as much at 40 knots as at 10 knots) and reynold's number is dependent only upon a single power of velocity.
but anyway, the slower the cheaper imho, within limits of 1-10 knots depending on engine, prop etc etc.
The royal navy speed limit is 12knots to save fuel.
I don't believe that a boat tester has the time or budget to perform extensive fuel mpg tests which in reality would take days and days for repeatability and accuracy, but will happily learn otherwise. Kim?
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