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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 01-23-2009
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Question Whatisit?

I am going to call this a whatisit?

Much different than a whatchamacallit!

It looks to be a through the hull depth, speed, temp something?

Has 2 wires; red and black.

Just curious if someone knows. Looks like it makes a big hole in the bottom of boat, so, I not want to touch it until the boat is out of the water.
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Whatisit?-whatisit.jpg  
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Old 01-23-2009
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Mostly just scarylookin'........
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Old 01-23-2009
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Probably a knotmeter since depth sounders usually are not removable.
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Old 01-23-2009
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I'd call that a hole waiting to happen.
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Old 01-23-2009
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Looks exactly like my original knot meter transducer.

That was on my previously owned boat - a 1973 C&C Shark 24.
Here's a link to the same part. Made by Moore Electronics.
http://www.moorelectronics.com/partsinfo/88-020-104.jpg
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Old 01-23-2009
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Hey.. another present/former Shark owner! A special welcome to you. Lots of us here.

David
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Old 01-23-2009
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Talking 1973

Quote:
Originally Posted by jimq26 View Post
That was on my previously owned boat - a 1973 C&C Shark 24.
Here's a link to the same part. Made by Moore Electronics.
http://www.moorelectronics.com/partsinfo/88-020-104.jpg
Yep, this is in a 1973 Santana 21' back when they made big bulky stuff that requires big holes!

So, I guess it actually does go through the hull and not shoot through the hull?

Dang, I hate drilling holes in a boat, especially when it is below the waterline.

Thanks
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Old 01-23-2009
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Quote:
Originally Posted by Gryzio View Post
Yep, this is in a 1973 Santana 21' back when they made big bulky stuff that requires big holes!

So, I guess it actually does go through the hull and not shoot through the hull?

Dang, I hate drilling holes in a boat, especially when it is below the waterline.

Thanks
There are few if any knotmeters that do not require a thru-hull fitting.. some sounders can be set up to shoot through the hull (at some cost in range)

Theoretically a Doppler-shift style ultrasonic knotmeter sensing through the hull is possible... and I think some were marketed at one point but AFAIK never really caught on. I suspect the hull thickness near the bottom of the hull is a bit too much in most cases and cored hulls would be worse.
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1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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Old 01-23-2009
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Eek

Looks like part of a pipe bomb
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Old 01-23-2009
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Definitely a knot meter transducer...I have one still in use on my Ranger 23. But mine doesn't look so bad...
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