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 Post subject: Mystery Boom Sound ?
PostPosted: Sun Sep 09, 2018 10:34 pm 
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Joined: Sun Aug 26, 2018 12:38 pm
Posts: 4
Hi All, Am very new to both this forum and Hobie Cat Sailing -- lots of questions to come. Recently bought an older ('83) H16 to get started and in spending time learning the craft by disassembling, inspecting, and making notes about things that might need attention and a good cleanup, as I was handling the boom and moving it around, I noticed some sounds that suggest something loose is sliding back and forth inside the spar.
The boom and all the parts viewable on the outside seem solidly connected and well sealed. Whatever is inside seems pretty permanently trapped as all attachments I found were riveted and the boom seems sealed tightly. (It floats, no bubbles escape) Whatever is inside that's moving sounds "soft" like maybe something sand like not like a solid clunking sound when I turn the boom from one end to the other -- a sort of swishing/sliding sound as whatever's in there slides from one end to the other. Anybody have an idea what I might be hearing? Do I need to care about it? Thanks!


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Mon Sep 10, 2018 9:26 am 
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Joined: Fri Aug 03, 2018 8:34 pm
Posts: 26
Possibly some old rivets that were replaced, drilled off the heads and pushed remaining rivet body in .
Then riveted piece back in place, if so, no worries...

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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Mon Sep 10, 2018 7:41 pm 
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Joined: Sat Oct 29, 2011 4:27 pm
Posts: 578
Location: Central Oregon
Ya... my boom and mast both have rivets rattling in them. Sail it!!

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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Mon Sep 10, 2018 8:28 pm 
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Hmm ... Dead rivets. Sounds reasonable. Thanks!


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Tue Sep 11, 2018 3:45 pm 
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Joined: Thu Aug 02, 2018 7:46 am
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My mast sounds like one of those rainsticks you can buy at science museums


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Tue Sep 11, 2018 8:06 pm 
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Interesting, I was handling it again earlier today and listening to the sound carefully, While I'm way too new at this to rule out the dead rivets theory, the sound is more like a swishing sound than what I think would be a more metallic sound of pieces of metal colliding with the boom end caps.

Which suggests a question: Are the booms (and masts too) filled with some material that may be breaking down and sliding around inside? I've read that masts are buoyant, which I tested and found to be true in my pool, Also checked the boom and it floats. Checked for air bubbles that might indicate leakage and saw none even with the spars submerged. Let them float for an hour and reweighed them to see if any indication they took any water in -- same weight.

Question about rivets: Have read Hobie used/uses Monel rivets for corrosion resistance. Can anybody confirm that? If so, any suggestions on where to get them?


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Wed Sep 12, 2018 7:46 am 
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emh161 wrote:
Interesting, I was handling it again earlier today and listening to the sound carefully, While I'm way too new at this to rule out the dead rivets theory, the sound is more like a swishing sound than what I think would be a more metallic sound of pieces of metal colliding with the boom end caps.

Which suggests a question: Are the booms (and masts too) filled with some material that may be breaking down and sliding around inside? I've read that masts are buoyant, which I tested and found to be true in my pool, Also checked the boom and it floats. Checked for air bubbles that might indicate leakage and saw none even with the spars submerged. Let them float for an hour and reweighed them to see if any indication they took any water in -- same weight.

Question about rivets: Have read Hobie used/uses Monel rivets for corrosion resistance. Can anybody confirm that? If so, any suggestions on where to get them?


There is a foam plug near the top of the mast but none to my knowledge in the boom. I think we've ruled out all other options. Your cat was used as a drug mule in the eighties and your boom contains a brick of Acapulco Gold.


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Wed Sep 12, 2018 8:13 am 
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Joined: Mon May 09, 2005 10:25 am
Posts: 3576
Location: Jersey Shore
Old rivet shanks would sound like small pieces of metal rattling around, not a swishing sound. Drill out the rivets and pop the end cap off. It's easy and is the only way you'll know for sure. There should not be anything inside the boom.

To reinstall, use either stainless or monel 3/16" diameter rivets (you'll most likely need a heavy duty rivet gun to pull them). Or, if you remove the aft end cap, you could actually use aluminum rivets since there's very little load on that cap and all the load is inward anyway, so the rivets really just keep the cap from falling off.

sm


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Wed Sep 12, 2018 8:21 am 
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Joined: Wed Nov 02, 2016 4:35 am
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Location: Opelika/Lake Martin, Alabama
"Your cat was used as a drug mule in the eighties and your boom contains a brick of Acapulco Gold."

Cha Ching!!!

Sent from my SM-G955U using Tapatalk

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1984 H16 Yellow Nationals Redline, "Yellow Fever"
Lake Martin, 'Bama.


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Wed Sep 12, 2018 6:26 pm 
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Joined: Sun Aug 26, 2018 12:38 pm
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Acapulco Gold! That should be worth a few rivets replaced! Might even buy me a REALLY nice rivet tool.

Per my previous question, As I've never bought Monel rivets before, Are they readily available at the usual suppliers?


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Thu Sep 13, 2018 2:30 am 
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Joined: Mon May 09, 2005 10:25 am
Posts: 3576
Location: Jersey Shore
Monel rivets are not required, stainless will work fine. If you’re worried about corrosion, use a dab of Tefgel under the head.

sm


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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Fri Sep 14, 2018 7:57 pm 
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Joined: Sat Oct 29, 2011 4:27 pm
Posts: 578
Location: Central Oregon
Harbor freight sells a beefy rivet puller for cheap.

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 Post subject: Re: Mystery Boom Sound ?
PostPosted: Sat Sep 15, 2018 7:34 am 
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Joined: Fri Aug 03, 2018 8:34 pm
Posts: 26
hobiesrock wrote:
Harbor freight sells a beefy rivet puller for cheap.


That's where I bought mine a couple months ago.
Works well

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