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(N1EE) wrote in message . com...
Joe,

Have you considered that the previous owner of a
boat might bave screwed up and put the wrong prop on?

Yes

Then you as the new owner might make the false assumption
that replacing the prop, with an indentical one, would be
a solution.

No, if it slipping as defined by cavitating then its pitch is to
great.
And if I put another opposite rotating prop on it would not be
IDENTICAL.

And I can not think of any marine transmission that does not have the
same ratio forward and reverse.

So all around your question is screwed up.

The only way a identical prop would be slipping and losing speed is
A: The transmission bands are slipping
B: You did not put the woodruff key in and the prop slips underload.
C: The woodruff key is missing in the shaft coupling.

No shame in it Bart, Just admit your wrong.

Joe

Bart

(Joe) wrote in message . com...
(N1EE) wrote in message . com...
5 points to Neal.

Inboard diesel powered boats commonly have different
gearing in reverse.

Incorrectly installing a RH or LH pitched prop when
the opposite was called for could cause a boat to
run at slower than expected speeds, albeit it would
move forward in the reverse position and vice versa.

Neal immediately grasped that the gear ratio might be
wrong and this could be explained by the boat running
in reverse, and at a lower gear ratio.

And you said identical. Identical is not a diffrent rotating prop.
To much rum Bart? WTF.... you usually do much better than this.
Sheeeeeze

Joe

Capt. Neal® wrote
If the shaft has a taper there is no way to put it on
backwards so, perhaps, they shipped a LH prop instead
of a RH prop or vice versa? Diameter and pitch could
be identical but it would be so slow if turning
direction were wrong.

CN

"Capt. Neal®" wrote

Remove it, turn it around, put it back on.

CN

"Bart Senior" wrote in

5 points (Impress me with your genius)

You just bought a new boat and notice the prop is old and brittle.

You replace it with an identical prop. After motoring around for a
while you find the top speed of the boat is much lower, estimated to
be 2.5-3 knots and the prop seems to be slipping.

What is the most likely cause, explaination, and cure?