Glassing in a log

OceanSprint

OceanSprint

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I am buying a Jaguar 24, and the survey says when commenting on the log and sounder sensors "Many installers over tighten these fittings and it is therefore prudent to apply a light GRP lamination or epoxy fillet over the securing nut and onto the surrounding hull surface inside the boat in order that the fitting remains in situ should the flange sheer off."

Questions:

1. If any one has done this, can they offer advice or a photo? How much is "light"? and what is an epoxy fillet?

2. Wouldn't I have to then cut out the sensor if it needed replacing ?
 
Not sure that is sound advice. If the fitting is installed correctly with sealer then it should not leak nor the flange sheer off. The clue is in the comment about over tightening. Follow the manufacturer's instructions.
 
OceanSprint said:
I am buying a Jaguar 24, and the survey says when commenting on the log and sounder sensors "Many installers over tighten these fittings and it is therefore prudent to apply a light GRP lamination or epoxy fillet over the securing nut and onto the surrounding hull surface inside the boat in order that the fitting remains in situ should the flange sheer off."

Questions:

1. If any one has done this, can they offer advice or a photo? How much is "light"? and what is an epoxy fillet?

2. Wouldn't I have to then cut out the sensor if it needed replacing ?
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I think you may find that the installation instructions do recommend glassing over the retaining nut.

May only apply to the housing for removable log impellers ... perhaps because you extract the impeller regularly and could easily disturb the seal other wise

Look at the instructions ... should find some on line. Your choice whether to go with them or not.

A couple of layers of a light chopped strand mat and ordinary polyester resin probbaly Ok .... Maybe something like Davids P40, which contains glass fibre strands, would be good enough http://www.halfords.com/webapp/wcs/..._productId_167469_langId_-1_categoryId_165625


But find some instructions on line...

Easy enough to chop away glass mat and resin with an old wood chisel if needed


Interesting that you should ask . My advice was sought on the weekend by someone asking if he should glass over the nuts on his skin fittings... he had noticed that the nut on his log impeller housing was glassed over!
 
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There was a story in PBO a few months back from someone who had his log fitting pop out, I think at the mooring. Being the only one on board, he was stuck holding it in the hole and wondering what to do. I can't remember the outcome of the story (the boat didn't sink :) ) but when he got home and looked at the instructions for the fitting, he found it said to glass over after doing up the nut, which had not been done.

Pete
 
prv said:
There was a story in PBO a few months back from someone who had his log fitting pop out, I think at the mooring. Being the only one on board, he was stuck holding it in the hole and wondering what to do. I can't remember the outcome of the story (the boat didn't sink :) ) but when he got home and looked at the instructions for the fitting, he found it said to glass over after doing up the nut, which had not been done.

Pete
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Yes I have looked at the Nasa instructions and they say to encase the nut and the fitting up to within 20mm of the top in GRP.

But why , you'd not glass over the nut holding an ordinary skin fitting. Surely not because the housing its not strong enough without.

I can only assume its because regular removal/refitting of the transducer for cleaning and fitting/removal the blanking cap could result in loosening of the assembly ???
 
VicS said:
Yes I have looked at the Nasa instructions and they say to encase the nut and the fitting up to within 20mm of the top in GRP.

But why , you'd not glass over the nut holding an ordinary skin fitting. Surely not because the housing its not strong enough without.
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I believe that this issue only refers to NASA logs because of the problem in PRV's post. As far as I recall it is because of over tightening of the nut can result in weakening/splitting of the tube, and so they recomend glassing in the tube to stop in snapping off. As you say removing and replacing the log probably aggrevates any weakness.
 
Pye_End said:
I believe that this issue only refers to NASA logs because of the problem in PRV's post. As far as I recall it is because of over tightening of the nut can result in weakening/splitting of the tube, and so they recomend glassing in the tube to stop in snapping off. As you say removing and replacing the log probably aggrevates any weakness.
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I assume you can lift the log even after it is glassed in?
 
Really depends on the transducer, for instance a properly fitted Airmar 744 would not benefit despite having a removable paddlewheel, cheapo flimsy NASA plastic stuff certainly would.
 
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