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 Post subject: H14 Mast Base Repair
PostPosted: Mon Apr 12, 2010 9:03 pm 
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Site Rank - Old Salt

Joined: Thu Apr 24, 2008 3:58 am
Posts: 575
Location: Knoxville, TN
I was stepping the mast a few days ago on my new (to me) 1982 Hobie 14. All was going well until suddenly the mast started to fall for no apparent reason. I couldn't react quickly enough to figure out what went wrong and catch it. As the mast fell I was able to guide it enough to keep it from hitting a Sunfish. As I looked around to try to figure out what in the world had just happened, I noticed the mast base still connected to the step by the pins, sans mast. Wow. Am I glad no one was hurt and there was no property damage. The aluminum at the bottom of the mast had apparently corroded and the stress of stepping the mast was too much for it to bear. The two (yes only two) stainless rivets were still in the mast base.

Now I need to reattach the mast base. This appears pretty straightforward, nevertheless, I want to run my plan by the panel experts to make sure I'm not overlooking something. My plan is to 1) clean the mast base and mast and put a bead of 3M 5200 Marine Sealant around the inside of the mast. Then 2) insert the base back into the mast, then 3) drill five holes through the bottom of the mast and base, and finally 4) rivet the base back onto the mast. I'm planning to use stainless rivets because they are stronger than aluminum. Are there any reasons why stainless would be a poor choice, perhaps due to hydrolosis? I plan to place a new rivet on each side of the old holes in either side of the mast (four rivets) and one dead center on the front of the mast.

Please shoot holes in my plan if you can. I'd like to address issues now rather than later.

Thanks,

_________________
Mark Van Doren
Division 9 Chairman
H16 #112205 (Richard Petty Signature Edition)
H14T #47787
H20 #647 (sold)


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 Post subject: Re: H14 Mast Base Repair
PostPosted: Tue Apr 13, 2010 4:05 am 
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Hobie Approved Guru

Joined: Mon Jul 14, 2003 7:11 pm
Posts: 4584
Location: Detroit, MI
That's the proper way to do it. Stainless rivets are required - aluminum rivets aren't strong enough in shear for that application.

You really don't need the 5200, but with an old corroded mast, it really can't hurt. It'll just be a PITA to take apart if you ever need to.


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 Post subject: Re: H14 Mast Base Repair
PostPosted: Tue Apr 13, 2010 4:28 am 
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Site Rank - Old Salt

Joined: Thu Apr 24, 2008 3:58 am
Posts: 575
Location: Knoxville, TN
Thanks, Matt. Congrats on your win at MWE. It was a pleasure meeting you and I'm glad I can now connect a face with the man behind these posts.

_________________
Mark Van Doren
Division 9 Chairman
H16 #112205 (Richard Petty Signature Edition)
H14T #47787
H20 #647 (sold)


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 Post subject: Re: H14 Mast Base Repair
PostPosted: Tue Apr 13, 2010 11:24 am 
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Site Rank - Old Salt

Joined: Mon May 24, 2004 10:33 am
Posts: 413
Location: Clinton, Mississippi
I think 5 rivets is overkill and am fairly certain that my daughter's H-14 only has two. I'd put in three at most to avoid further weakening the remaining useable area on the two parts. And like Matt said....the 5200 on the base doesn't do anything really because you should have a foam plug gooped in with sealant about a foot up from the base. Check the plug while the base is off and clean/reseal as necessary.

It was nice to meet you at MWE as well. See ya' soon!

Jerome Vaughan
Hobie 16
Clinton, Mississippi


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