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 inwater knotmeter paddle install		  New Topic  Topic Locked
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cat78
1st Mate

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34 Posts
Initially Posted - 04/10/2004 :  15:08:49  Show Profile
I HAVE PURCHASED A NEW EMS KNOTMETER AND THEY RECOMMEND THAT I CHANGE THE PADDLE WHEEL. I HAVE HEARD OF PEOPLE DOING THIS WITH THE BOAT IN THE WATER. HAVE YOU OR ANYONE DONE THIS AND HOW HARD WAS IT?
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 04/10/2004 :  15:23:53  Show Profile
Not that bad... more a 'anxiety-inducing' event than anything. You'll get a couple gallons of water in the boat when you do it. Keep some rags handy to stuff in the hole if all else fails ;>) (I haven't needed to do that).

I don't know if your thru-hull fitting is the same as mine... but mine has a 'clamshell' that closes over the opening as you withdraw the paddlewheel to install the blanking plug. Reduces water inflow during the switchover. Make sure you have some silicone grease to freshen up the O-ring seals when you put the paddlewheel back in.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 04/10/2004 :  16:13:13  Show Profile
When you do it...have someone else hold the camcorder!
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 04/10/2004 :  19:37:26  Show Profile
Er... it did come with the 'blanking plug' didn't it ?
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oldsalt
Admiral

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USA
578 Posts
Response Posted - 04/10/2004 :  21:21:18  Show Profile
Are you certain that the new paddle wheel assembly will fit into the existing through hulll "sleeve"? When I replaced my Standard Horizen speed log, it came with a larger diameter paddle wheel and through hull sleave and I even had to enlarge the hole in the hull.

You wouldn't want to try any of this this when splashed.
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Chip Hunt
Navigator

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120 Posts
Response Posted - 04/10/2004 :  23:38:05  Show Profile
When I switch between the wheel and the plug, I only get about a pint and a half of water in the boat. The trick is to have the wheel ready when the plug comes out, and jam it in as quickly as you can and tighten it up. Placing a big sponge near where the water comes in will help you, too. It is really no trouble to switch them back and forth at all.
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Buzz Maring
Master Marine Consultant

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USA
1771 Posts
Response Posted - 04/10/2004 :  23:59:59  Show Profile
What is a "blanking plug?" Does anyone have a photo or a drawing of one?

My knotmeter gave up the ghost long ago, and I'd like to permanently plug the hole with something other than the paddle wheel ... could I use a blanking plug to do that? If so, where could I find one?

I looked all over for a PVC cap to screw onto the end of the through-hull, but I never was able to find the correct size and threads ... maybe a blanking plug work ... what do you think

Thanks!
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 04/11/2004 :  00:57:43  Show Profile  Visit JimB517's Homepage
Its really no problem. I pull mine out all the time to clean it. I suck the water out of the keel well with a shop vac (or you can use a bailing pump and a sponge).

The blanking plug is made to fit exactly in the shaft where the paddle wheel goes. The trick is to have everything ready and at hand before you pull the plug.

Water doesn't really come in all that fast. A pint looks like 10 gallons, though.
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Gloss
Master Marine Consultant

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USA
1916 Posts
Response Posted - 04/11/2004 :  09:17:56  Show Profile
Drill another hole in the bottom, near the keel, to let the water out
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 04/11/2004 :  11:45:26  Show Profile  Visit Frank Hopper's Homepage
In my faded memory there exists a replacement soft-plug for car engines. They are a rubber disk with a bolt and nut the you can stick in your engine block if a factory soft-plug gives up the ghost. When you tighten the nut it compresses the rubber disk causing it to bulge out at it's sides and it makes a tight seal. I wonder if one of those could be a semi-permanent plug for a boat hull while the boat is still in the water.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 04/11/2004 :  12:25:34  Show Profile
"What is a "blanking plug?" Does anyone have a photo or a drawing of one?"

Many paddlewheel speed transducers were designed so that you could remove the paddlewheel assembly while in the water for cleaning. (they are notoriously sensitive to contamination). These units will come with a 'blanking plug' (my term) that can be inserted into the thru-hull fitting while the paddlewheel is out for cleaning.

If you want to simply abandon that thru-hull, I think I've seen a simple 'plug' that cam be bolted into the thru hull hole. (not in the water for this one). Will nose around and see if I can find one.

One of the manufacturers has come out with a 'no moving parts' speed transducer that uses ultrasound to measure the water velocity... hoping I will be able to find a retrofit model for my paddlewheel... (paddlewheels are a nuisance to keep working in salt water).
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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.