propeller shaft is pretty simple.
straight shaft supported on two bearings with a propeller at one
propeller blades should be equal and when spinning, there should
be no vibration.
like a flywheel.
just like a flywheel, when spun, it should have momentum to spin
for a while.
the boat is out of the water, the bearings for the prop should
enable the propeller
to spin freely.
it doesn’t. Engine power is being wasted.
is another issue.
the boat is cruising, the propeller is pushing the weight of the
boat through the water.
of Mr Newton’s “action and reaction”, the
propeller shaft is pushed with equal force
propeller shaft bearings are designed to allow freedom of
are not designed to accommodate sideways load. This will create
a thrust bearing somewhere along the length of the propeller
the friction down.
the propeller spin freely.