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Showing results 1 to 13 of 13
Search took 0.00 seconds. Search: Posts Made By: Stumble
Forum: Construction, Maintenance & Refit 30-03-2017, 18:34
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

Lol, your chainplates are almost custom designed to ensure they'd would be expensive to make in titanium. The interconnected web of metal with lots of weld surface... it was actually discussed if we...
Forum: Construction, Maintenance & Refit 30-03-2017, 18:30
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

And yet we couldn't get cast titanium parts, which are pored in a hard vacuum, past the FAA inspectors without HIPPing then density testing, then individually testing every part. At least not if they...
Forum: Construction, Maintenance & Refit 30-03-2017, 11:54
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

I just did the same for G5 titanium flat bar. You would be looking at around $600 total. But the sizing is slightly different (.498" instead of .5).
Forum: Construction, Maintenance & Refit 30-03-2017, 09:47
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

If they cut to true dimensions the variations in weight mean either they work with poor tolerances or it should likely cast. With the variations due to predicted inclusions. How comfortable would you...
Forum: Construction, Maintenance & Refit 29-03-2017, 14:40
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

You can do anything... you can make a mast out of a mild steel rod. But there are very good reasons why you shouldn't is probably a better way to phrase it.

Casting any metal has major concerns...
Forum: Construction, Maintenance & Refit 29-03-2017, 13:35
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

There is absolutely nothing wrong with siliconized bronze for chainplates. But like all materials they have tradeoffs.

1) they need to be resized compared to stainless. No major issue really. ...
Forum: Construction, Maintenance & Refit 28-03-2017, 10:52
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

The material the chainplate is made from does not determine their strength. It is the combination of material and size. I can very easily design a stainless chainplate stronger than a galvanized one...
Forum: Construction, Maintenance & Refit 28-03-2017, 10:48
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

You only need to use titanium if the laminate is carbon fiber, for a fiberglass hull stainless or aluminium is fine.

Because the metal ferrules are not in tension stainless won't be subject to...
Forum: Construction, Maintenance & Refit 27-03-2017, 15:49
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

Which number?

The 40% number i threw out is what I remember about the causes of rig failure, probably from an insurance report. So about 40% of the time if the rig fails it's because of the...
Forum: Construction, Maintenance & Refit 26-03-2017, 14:04
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

I tend to fall very heavily in the composite camp. Frankly if you have a colission hard enough to break composite chainplates you are probably already looking at a boat that is now scrap anyway....
Forum: Construction, Maintenance & Refit 26-03-2017, 12:56
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

A direct strike to an ungrounded carbon mast can pretty easily blow holes in it, it will almost certainly do substantial structural damage. But these days it's pretty rare to see a carbon rig...
Forum: Construction, Maintenance & Refit 26-03-2017, 10:51
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

So long as the tows are still in place they are still fine strength wise. Remember chainplates are in almost pure tension, so you could actually get away without any resin and they would still hold...
Forum: Construction, Maintenance & Refit 26-03-2017, 08:55
Replies: 70
Views: 11,062
Posted By Stumble
Re: The new era on chainplates..

I suspect that they can be repaired the same as any other fiberglass damage, cut out the bad, relay that laminate stack, then let the goop set. No different than you would if a boat took a major...
Showing results 1 to 13 of 13

 
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