Hobie Forums :: View topic - rivit questions

Just a little bit more information here to help. The washers that back up the rivets for the tramp tracks on the hulls need to have a slight curve to them to seat properly. If you leave them flat this will make the problem of the holes in the hulls getting larger. Like Matt said, there is just a shear force on the rivets. If you leave the backup washers flat, then the rivet will tend to wiggle slightly back a forth port to starboard to port.

When I replaced mine, I slightly bent the washers to the curvature of the lip on the inside edge of the hulls with pliers. As a result, they were easier to put on, allowed the rivet to seat properly, and distributed the load (tightening) of the tramp better.

Author:	Hobie Nick [ Mon Apr 03, 2006 5:51 am ]
Post subject:	rivit questions
I have been working on getting my boat ready for the new sailing season and have been replacing parts. I was draining water from inside my Magnum wings and I noticed that the rivits that hold the end caps had a "spacer" between them and the alumunim tube. What material is this spacer? I think the rivits themselves are Monel from the extra effort it took to drill them out. Also, I wanted to remove and reattach my tramp side rails (they are getting a little loose). I noticed in the parts guide there are washers that back up the tivits. What material are these? Should I wait until I refinish my hulls to do this? Or is the track being slightly loose something I should fix ASAP? Thanks in advance guys!

Author:	flumpmaster [ Tue Apr 04, 2006 9:12 pm ]
Post subject:
I think the rivet sleeves in the aluminum wings are monel. When you remove the tramp side rails you may find the holes in the hulls have become enlarged - to the point that just replacing the rivets won't keep the side rails tight. I have filled the holes with west system epoxy and high density adhesive filler, then redrilled the holes using the side rails as a template. I don't know what material the original rivet washers on underneath the lip of the hull are made of. I replaced them with stainless rivet washers a couple of years ago on a H18 and they have held up well. Perhaps Mat Miller could comment? Chris.

Author:	mmiller [ Wed Apr 05, 2006 9:00 am ]
Post subject:	Rivets
Quote: I noticed in the parts guide there are washers that back up the tivits. What material are these? Should I wait until I refinish my hulls to do this? Or is the track being slightly loose something I should fix ASAP? The washers are aluminum. I would probably tighten up the tramp and forget the tracks are a little loose. The load is in shear on the rivets, so not a big deal. Not likely to be a failure issue.

Author:	Hobie Nick [ Wed Apr 05, 2006 9:06 am ]
Post subject:
Thanks Matt. That will save me a weekend of work on the boat.

Author:	Hobie 18 #7877 [ Wed Apr 05, 2006 12:51 pm ]
Post subject:
Just a little bit more information here to help. The washers that back up the rivets for the tramp tracks on the hulls need to have a slight curve to them to seat properly. If you leave them flat this will make the problem of the holes in the hulls getting larger. Like Matt said, there is just a shear force on the rivets. If you leave the backup washers flat, then the rivet will tend to wiggle slightly back a forth port to starboard to port. When I replaced mine, I slightly bent the washers to the curvature of the lip on the inside edge of the hulls with pliers. As a result, they were easier to put on, allowed the rivet to seat properly, and distributed the load (tightening) of the tramp better.

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Author:	flumpmaster [ Wed Apr 05, 2006 7:49 pm ]
Post subject:
Hobie 18 #7877 wrote: Just a little bit more information here to help. The washers that back up the rivets for the tramp tracks on the hulls need to have a slight curve to them to seat properly. If you leave them flat this will make the problem of the holes in the hulls getting larger. Like Matt said, there is just a shear force on the rivets. If you leave the backup washers flat, then the rivet will tend to wiggle slightly back a forth port to starboard to port. When I replaced mine, I slightly bent the washers to the curvature of the lip on the inside edge of the hulls with pliers. As a result, they were easier to put on, allowed the rivet to seat properly, and distributed the load (tightening) of the tramp better. I also prebent the washers. They are reasonably akward to fit. In my case I had to fix the holes and re-rivet the tracks as a couple of the rivets had pulled out. This was after double grommeting the tramp and lacing it with a skinny spectra line and probably tensioning it a wee bit too hard (I think I ate a can of spinach first). As Matt says - they are in shear so unless they are really loose or pulled out you can probably ignore them for a while.

Author:	Hobie Nick [ Thu Apr 06, 2006 5:30 am ]
Post subject:
They are not too loose and I only noticed them move when I grab the firmly and they only move about .075" total. About the washers. I was thinking of fabricating a piece of stainless bar that fit into the grove under the deck lip to spread the load out over more surface area. From what I remember the groove "pinches" fairly tight in the middle third of the rivit hole pattern. Am I correct? If so does anyone have measurements that I can use to custom fit this bar in place?

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