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Old 08-02-2008, 10:41   #31
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Originally Posted by Kanani View Post
French Naval Frigate. The ship was about 400' long and the pilot house was about 60' off of the water. The seas were breaking completely over the top of the pilot house on that ship while we were merely getting some spray on our deck.
Yea, but they probably had more wine in their pilot house than any of us could even carry.


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Old 08-02-2008, 12:05   #32
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In all likelihood the Frigate was in a critical wave period (0.9 to 1.3) of her ships length and speed of advance, to make heavy going. That is why small yachts quite often are more comfortable in ocean going swells than freighters.

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Old 08-02-2008, 12:38   #33
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Originally Posted by BigCat View Post
I think prop shafts should not only have key ways and keys, but a cotter pin or bolt right through the shaft and coupling, and not just set screws-I don't know what his arrangement was on the tri.

Holes drilled thru prop shafts are not wise! It weakens the shaft leaving it subject to a twist fracture. Shafts are designed in for a certain strength, drilling a hole thru would compromise that.

See picture below. The couple should have two square head set screws (factory hardened w/ holes in the head) opposite of each other with a safety wire keeping them from backing out if they ever come loose. And should be periodically inspected as well as other parts of the machinery!

Before the installation of the SS's a drill should be put down thru the threaded holes and dimples drilled into the shaft just deep enough for the SS tip to sink below the surface. This does two things;

1) the coupler can be removed without having to beat/pry it off over the dimples left by SS's.

2) Even if the SS's become loose but stopped by the safety wire, the couple will not come off. Although, it would leave dimples in the shaft making the coupler hard to remove. BUT, better then loosing a shaft.

Now back on anchoring ........................._/)
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