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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 250 Specific Forum
 Knot Meter Impeller		  New Topic  Topic Locked
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John Russell
Master Marine Consultant

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USA
3444 Posts
Initially Posted - 07/25/2007 :  19:16:11  Show Profile
two trips ago, my knot meter wasn't registering at first. I assumed it to be the impeller was fouled by whatever grows under the boat in the slip. After a few minutes (5-10) it started working again. The last time out the same thing occured but it started working sooner. Probably because the water was a little rough, there was more wind so I was moving a bit faster.

I'm not going swimming under the boat so that leaves pulling out the impeller to clean it from inside. I'm just assuming that can be done given the set of pins that hold it in seem to be easily removed. Can it? Anybody have any tips?
John Russell
1999 C250 SR/WK #410
Bay Village, Ohio
Sailing Lake Erie
Don't Postpone Joy!
Edited by - John Russell on 07/25/2007 19:16:34

britinusa
Web Editor

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USA
5404 Posts
Response Posted - 07/25/2007 :  20:45:16  Show Profile  Visit britinusa's Homepage
John, what brand?

Paul.
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 07/25/2007 :  21:09:31  Show Profile
You'd think I'd know that. Well.......... Not so much. I'm trying to picture the instrument panel on the bulkhead and I don't think there's a brand. I'll re-ask the question after I go back out to the boat this weekend. All of the documents, etc. are on the boat.
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John Hill
1st Mate

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USA
25 Posts
Response Posted - 07/25/2007 :  21:39:20  Show Profile  Visit John Hill's Homepage
Does it look like this per chance? (only image I could find - ...I know it's a shot in the dark)



If so it's a Raymarine.
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 07/26/2007 :  12:04:11  Show Profile
No, thanks, John. Actually, I assumed that they were rather standard equipment, guess knot .
Edited by - John Russell on 07/26/2007 12:04:37
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Russ.Johnson
Commodore

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USA
836 Posts
Response Posted - 07/26/2007 :  17:04:54  Show Profile
John,
My knotmeter was a factory installed option when I bought the boat.
It's a RayMarine like the one pictured above.

The factory installed paddles can be removed from inside the cabin.
The unit just unscrews and there is a rubber flapper that automatically blocks the hole.
If you want to clean the paddles and re-insert it's no big deal.
If you want to take the paddles home, there is an extra plug that screws into the hole.
I wouldn't leave the boat with just the rubber flapper blocking the hole.

Since you have a different model, that may or may not work.
At least, have the extra plug ready and prepare to be quick about it.
Better yet, put it on the trailer and deal with it later.

Russ #793
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 07/26/2007 :  17:31:07  Show Profile
Thanks, Russ. I'll trust there's a flapper valve but I'll keep the plug handy. I also have a spare paddle wheel so I can just swap them out. I just wasn't sure of the amount of water I should expect.
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kevinmac
Admiral

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USA
732 Posts
Response Posted - 07/26/2007 :  18:51:00  Show Profile
John, I hope you see this before you go try it.

On my boat (Raymarine as well), there is a flapper, but until the plug goes in, there is still a non-trivial amount of water flowing in. The drill (for me anyway) is to unscrew the sensor and pull it out, then immediately insert the plug. When tightening the plug, or the sensor when you put it back, tighten finger tight and no a lot more, as the plastic threads will strip if you overdo it, which would mean a thru hull replacement.

When I follow the above procedure, the amount of water that ends up in the boat can be cleaned up with one hand towel.
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 07/26/2007 :  19:18:30  Show Profile
Thanks, Kevin. I won't be out to the boat 'til this weekend. Thanks for the tip. I'll surround it with a few old towels and keep the plug handy.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.