NASA Log skin fitting cracked!!!

[jimbouy]

291

<hr width=100% size=1> "It is a pleasure to give advice, humiliating to need it, normal to ignore it"

 

[Birdseye]

You are quite right to be irritated on the basis of what you have said. Best thing is not just to write it down to experience but to write to your local trading standards with a copy to Nasa. If the fittings are as faulty as alleged, then they shouldnt be allowed to continue to supply them.

From memory, Echopilot suggest that an inside echosounder (as opposed to a through hull one) be fitted inside a piece of small dia plastic drainpipe (abs ?) fixed to the inside of the hull with plastic padding. I did it several years ago and it worked very well.

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[boatless]

Yep, all the transducers I've ever fitted have been internal, and all have worked well in UK type depths at least.

<hr width=100% size=1>my opinion is complete rubbish, probably.

 

[chriscallender]

Good news that its a BSP thread, I think I will do exactly this when the boat is next out of the water.

As you sound like someone who's done this before, what did you use to polish up the inside of the fitting? Would a Dremel + grinding paste be up to the job or does it need something more sophisticated?

Thanks

Chris

Chris

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[Avocet]

I guess you'd need to put it on a lathe with a boring bar to get an inside surface good enough for the "O" ring on the paddle wheel to seal against. Depending on how round and smooth it was "as cast", you might be able to do it with a load of abrasive flap wheels and some parafin but it would be very hard work and you'd still run the risk of it not being a true circle afterwards.

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[uforea]

Hi Chris. I just used a piece of wood dowelling with 320 wet and dry wrapped around it . The inside surface is not that coarse so it was just a matter of taking the "high spots" off. There is a fair bit of give in the "o" ring which takes up any slight errors in the internal measurements.

Ted.

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[chriscallender]

Thanks Ted, thats the answer I was wanting to hear ... I'm going to make myself a bronze one to fit at next haul out.

Chris

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[chriscallender]

Thanks Ted, thats the answer I was wanting to hear ... I'm going to make myself a bronze one to fit at next haul out.

Chris

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[Plum]

I fitted my NASA log skin fitting 5 years ago with Sikaflex. So far, no problems.............. how old was yours?

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[jimbouy]

You'll have to pardon my ignorance but is this a boat fitting or plumbing, where do i get one ready for next year.

<hr width=100% size=1> "It is a pleasure to give advice, humiliating to need it, normal to ignore it"