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i have an old gasoline fueled skiff that only makes 3-4 knots. I find this to be strange since the engine is rated at 10-12 horsepower. It isn't that heavy and i figure it should be able to do more. Could this be because the flywheel is TOO heavy? And i'm talking MASSIVE. it's like 50kg. Maybe even more

user9534017
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Flywheel weight will not impact the power output of your engine. The mass of flywheel will change the rate of change of speed of the engine:

  • A heavy flywheel will mean the engine is slow to speed up and slow down. This is good for smoothing out a rough engine.
  • A light flywheel makes the engine more responsive and also less stable, it can change gears quickly and will possibly stall more easily and feel less smooth.

A heavy flywheel is suited well to a boat where engine speed transients are not desirable.

I suspect you have another issue impacting the output and consequentially the top speed of your boat.

mx5_craig
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