Hobie Cat Forums

It is currently Wed Oct 01, 2014 11:01 pm

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: Mast base replacement
PostPosted: Fri Jul 28, 2006 2:12 pm 
Offline
Site Rank - Deck Hand

Joined: Fri Jul 28, 2006 2:03 pm
Posts: 3
Location: Cary.IL
I am new owner of a 1977 H16. I have sailed it twice now and have an issue with the mast base. When rasing using the step up the mast the base caught up on the outside edge and ripped out on the mast itself (rivets and all) It looks as if a previous owner may have cut the mast down at one point. I have another mast base from a H16 I am using for parts. Can the mast be cut down ? it seems like the only way logically to fix this but I have not seen anyone else have this problem on the forum?

Thank you,

Jamie

_________________
Jamie


Top
 Profile  
 
 Post subject: Torn?
PostPosted: Fri Jul 28, 2006 4:53 pm 
Offline
Site Admin

Joined: Tue May 27, 2003 12:44 pm
Posts: 9059
Location: Oceanside, California
Rivets tore the extrusion? You could just place rivets in a different position. Worth a try if you are considering cutting the mast anyway.

Cutting the mast lowers the tang and makes the wires (seem) longer. This may effect the rigging, lower the boom. Probably not a huge problem, but I would try the other option first.

_________________
Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


Top
 Profile  
 
 Post subject: mast base replacement
PostPosted: Fri Jul 28, 2006 8:17 pm 
Offline
Site Rank - Deck Hand

Joined: Fri Jul 28, 2006 2:03 pm
Posts: 3
Location: Cary.IL
I tried adding more rivets the first time but probablu used too small of rivets. I would be cutting about a 1/2 inch just to get past the ripped out rivet holes. Thanks for your help on this and your many other posts I feel like I have already learned a ton in a very short time on this forum

Thank you

Jamie

_________________
Jamie


Top
 Profile  
 
 Post subject:
PostPosted: Fri Jul 28, 2006 10:19 pm 
Offline
Site Rank - Admiral

Joined: Fri Jul 21, 2006 2:02 pm
Posts: 287
Location: SJ, PUERTO RICO
Dude, this option may be more expensive but will be the right way to do it. The most imp issue here is mast lenght!

Have the welder guy at the local marina to weld a 1/2" or 3/4" strip of aluminum around the mast...covering ripped out holes and restoring the edge...U will have double the material to drill/rivet and get a great joint with the base casting. Without cutting the mast.

At least that is what I would do!


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jul 29, 2006 3:36 pm 
Offline
Hobie Approved Guru

Joined: Mon Jul 14, 2003 7:11 pm
Posts: 4613
Location: Detroit, MI
Cutting off 1/4" to a 1/2" will not greatly affect the mast and should give you good metal to set new rivets into.

As Matt M. said, the shrouds and forestay will seem longer after that, so some adjustment will be necessary.

Welding metal on the bottom of the mast is not a good idea. Heating extruded aluminum (to the point of welding) weakens the metal significantly. It's not at all like welding steel. You would be creating a weak zone at the bottom of the mast where it is subjected to significant stresses.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Jul 29, 2006 4:08 pm 
Offline
Site Rank - Admiral

Joined: Fri Jul 21, 2006 2:02 pm
Posts: 287
Location: SJ, PUERTO RICO
Well my guess is that double the material at the base will still be stronger than a single layer of extrusion...
Even if the welding actualy weakens the area as u say (which I doubt), the base will be stronger than what u suggest.

If u decide to cut, the thought of knowing ure mast is not exactly up to spec will be a nightmare, and then having to look at ure shroud adjusters a hole lower....uff

Man I would do all possible to keep ure rigging as close to original dimensions in every aspect.

My idea is not only a fix but actualy an upgrade to having it fail again!

1/4" to 1/2"...compare that to having our private member 1/2" shorter....how would u feel?


Top
 Profile  
 
 Post subject:
PostPosted: Sun Jul 30, 2006 9:47 pm 
Offline
Site Rank - Old Salt

Joined: Wed Jul 21, 2004 7:46 pm
Posts: 1468
Location: Santa Cruz
Jamieb, In our second post you said you may have used the wrong size rivets. Did you use the wrong type of rivets? If you go to the hardware store and buy rivets, then you may have gotten aluminum rivets instead of stainless. I see this all the time. The aluminum rivets are not strong enough! Get some stainless 3/16X1/2 (I think) and do as Matt suggested--should work.

_________________
Sail Revolution
Join us on our new FB Page!


Top
 Profile  
 
PostPosted: Mon Aug 07, 2006 2:09 pm 
Offline
Site Rank - Captain

Joined: Sun Aug 06, 2006 5:06 pm
Posts: 59
Location: Evansville, IN
I have the same issue on my recently purchased 16. Base is just barely hanging onto mast, one rivet has cracked out the mast, the other is almost ready to do so (hairline cracks present).

If I understand Matt's suggestion, I can drill new holes the same distance from the bottom of the mast a couple of inches away from the existing rivets and into the mast base? I've ordered replacement rivets from Hobie. Then simply set the rivets in these new holes? Will an ordinary hand rivet tool work? I've only used it on aluminum rivets before, not stainless steel.

Does the mast base have a collar or flange all the way around so hole position doesn't matter?


[quote="mmiller"]Rivets tore the extrusion? You could just place rivets in a different position. Worth a try if you are considering cutting the mast anyway.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Aug 07, 2006 2:55 pm 
Offline
Site Rank - Old Salt

Joined: Wed Jan 04, 2006 10:30 am
Posts: 362
Location: Abq, NM
I just took a 6" strip of galvinized duct metal and some JB weild, glued the strip to the bottom of the mast, seems to have worked great.


Sam


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group