Log impeller

dmarler

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27 Mar 2005
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First time out this season, I lost my log impeller - the little paddle wheel disappeared when one of the jaws holding it snapped across the little axle hole. The log is a Plastimo Minilog (1986)and gives/gave a distance reading at the chart table and a speed reading on a Shark repeater in the cockpit. The whole assemblage was getting a little tired and perhaps due for replacement not too much further down the road anyway, but the diameter of the sender - if that is the correct term for the thing that goes down the hole, with the impeller on the end of it - is only 3cm. It now appears that virtually everything on the market these days is bigger - Airmar who do many of the impellers have a 2" or 5.2cm standard. So early in the season I don't want to haul out again for the laborious and expensive process of having a new bigger hole cut. Even if I found a 3cm sender to fit the hole, there could be a problem with the thread for the screw cap that keeps the whole show watertight. One answer might be to go at least temporarily for a trailing log or just rely on the GPS...but I still hope that some wise fellow-yottie out there can think of a solution or source of supply which would fit elegantly with the set-up that I have. Any ideas, any one?
 
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Might sound stupid - but try the wanted forum below, wanted section of Boats and Outboards / Boats for sale etc. etc.

There must be someone out there that has a duff head and working transducer ?????
 

philip_stevens

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Check the size of a Navman log impeller transducer through hull fitting. I fitted one last year and it was smaller than the Seafarer through hull fitting it was replacing. I had to fill the small gap around it with epoxy.

This page http://www.navman.com/marine/products/transducers/index.html will show all the speed transducers and hole size. It looks as though 42mm is the smallest.
 

ShipsWoofy

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10 Sep 2004
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I did this once, never again.

I felt inclined to rush the job. I was petrified that had something gone wrong I would be left with a 42mm hole in the bottom of the boat.

As it was I made a pigs ear as the fitting leaked after I had extracted it for cleaning a couple of times.

I fitted the new one in the yard relocating it slightly as part of the problem was it was just under the oil filter of one of the engines, the angle applied to remove was what caused the leak. Was there because the sowester fitting was removed from that spot.

I took 3 days (allowing full setting of GRP, Silicone and epoxy). I would now be willing to hit the thing with a hammer and trust it to remain unscathed.

Unless in emergency, I would not do this kind of job between tides again.
 

wiggy

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13 Jun 2001
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some yards will do a good rate for a weekend out of the water. I did a similar thing and Northshore in Chichester Harbour put me on a trolley for a weekend at a great price. In the end the whole job including re drilling the hull only took a couple of hours. They even kept an eye on the new installation for a day to check for leaks before returning boat to mooring at no cost. Great service and great price (just over £100)
 
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