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Old 04-24-2015, 07:50 AM   #15
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1975 31' Sovereign
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Quote:
Originally Posted by perryg114 View Post
Sheet metal screws won't cut it for shell to frame connections. All those will do is hold the floor to the c-channel.

Perry
A pry bar under the hold down plate confirms this. All I had done was connect the channel and floor to the plate. A connection has to be made to the cross member below as well. I added a half dozen grade 8 bolts from below, with aluminum shims, washers, and nuts on top. Going to add some steel shims under 3/8 bolts on the corners, including two extra bolts through added angles outside the frame, per InlandAndy's instructions. Big thanks to you, Perry, for making me scratch my head a little bit more. Probably saved me from a lot of trouble later!
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Old 04-24-2015, 10:00 AM   #16
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Your welcome. At least you did the right thing and fixed it. Good job.

Perry
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Old 04-24-2015, 10:30 AM   #17
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Has anybody thought about the galvanic corrosion that might occur with Stainless on the steel frame?
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Old 04-24-2015, 10:54 AM   #18
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No way to get around it other than coat everything with POR15 or similar. You can also dip bolts in paint and wet install. You bolts won't rot at least.

Perry
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Old 04-26-2015, 02:37 PM   #19
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Thanks (or damn you) JCWDCW, I had very slightly but your prompt made me think about it even more. Figured there would be very little electrolyte to cause corrosion, but who are we kidding these AS's leak and could pool in the c channel. Lots of research over the last 24 hours. So after researching much more I'm not sure I'm comfortable with the galvanic potential between the Steel and stainless steel, as well as the aluminum. The difference is even bigger between the SS and aluminum which worried me more than the SS to steel. Found several ref's that said SS bolts through steel probably wouldn't be a major factor, but SS to aluminum could. So I'll be replacing the bolts again. This time I'm getting some Grade 8 Ultracoat/ArmorCoat (http://www.kimballmidwest.com/catalo...at%20Flyer.pdf) bolts from McMaster-Carr. Should have dome more research in the beginning and done this first. No issues between the bolts and the steel or aluminum. The coating is actually a zinc and aluminum coating, which sounds perfect.
I'll use bolt with similar coated washers and nuts and then use a backing nut to lock the first nut in place as they recommend not using anything on the threads for lubrication, Loctite may be fine but why chance it when I can just lock with backing nut.
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Old 04-26-2015, 07:39 PM   #20
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Use a hot dipped zinc plated washer and stainless steel bolt and that will take care of the corrosion. Zinc is anodic to all of them.

Perry
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Old 04-27-2015, 08:55 AM   #21
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Sorry HiJoeSilver

My chemistry background seemed at odds with everyone's enthusiasm. You could try galvanized washers...but as you say if the channel gets wet you'll never know what's going on! I would have opted for hot dipped galvanized bolts but your choice sounds as good or better

On the flip side, I built a sail boat and used stainless screws on the stainless fittings on the mast with no problems. The exterior was anodized so no problems but the screws were biting into the aluminum under the anodizing. Still, on this job I would be going your route.
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Old 04-27-2015, 05:46 PM   #22
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Did I tell you that you can and should put drains in the C-channel and seal any leaks in the c-channel? If water has a place to go it won't rot things.

Perry
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Old 04-27-2015, 09:46 PM   #23
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JCWDCW and Perry, thanks for all the feedback,
I probably could have gone with the galvanized bolts, or even the chromate finished corrosion resistant, but buying the super crazy corrosion resistant ones wasn't too expensive compared to the others. I just wish I'd gone this route in the first place, think I'd recommend this for anyone. If you're going the full montey shell off rehab the $50 shouldn't be that big of an issue, but I've gotten really cheap/frugal since "retiring". In the end would have been cheaper than replacing with 1/4" with SS then upsizing to 5/16 SS, then this route.
Perry I've got small holes on the bottom outer edge of the c channels so they'll drain out through the small space between the outer skin and c channel and down into the belly pan.

Now the 20 million other things to tackle and wrack my brain about.
thanks Joe
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Old 04-29-2015, 07:23 AM   #24
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Stainless bolts really don't worry me and I am an aerospace engineer.

Perry
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Old 04-30-2015, 07:23 AM   #25
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So I'm going to go with Perry on this one. I'm a Chemical Engineer, and my only follow-up concern would be that SS and Aluminum in an exterior potentially salty environment might be a bad combo. As I noted before I had no problems with SS and Aluminum Mast on my home built sailboat
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