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post #35 of Old 05-07-2012
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Re: Dead Reckoning

Originally Posted by casey1999 View Post
How do you stop the water when you pull the thru hull knotmeter? I have two old thru hull knot meters in my boat. Will remove all and glass in a patch on next hull out as I fear them getting knocked out and hole the boat. Which leads to next question: Why do not all these thru hull knot meters and depth sounders not require a seacock shut off? Seems these plastic "plugs" are an accident waiting to happen. Seems they could be designed to be insert into a seacock and if they were knocked out or started leaking you could pull them out and shut the seacock.
Knotmeters must have a blank plug that is used when the knotmeter is pulled.

"Modern" knotmeters have a flap that stems the flow when the knotmeter is removed.

Wooden plugs can be stop the flow from a broken thru-hull.

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Last edited by jackdale; 05-07-2012 at 04:54 PM.
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