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Old 06-12-2017, 22:41   #16
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Re: Titanium chainplates for non-millionaires

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Originally Posted by Barefootnavigat View Post
Titanium is the new bronze at half the price and looks really good on traditional boats. What about the bolts?
We can supply Titanium bolts and other fittings like tangs as well.
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Old 07-12-2017, 00:55   #17
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Re: Titanium chainplates for non-millionaires

Hi Sailfar
Does it make sense to have Jordan series drogue chainplates made from Ti with Ti bolts for a FG hull ? Typical designs for such stern attachments are (very UGLY ) SS 316L plates ľ x 2.25 x 18 inches attached with six 3/8 bolts !
Christian
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Old 07-12-2017, 04:41   #18
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Re: Titanium chainplates for non-millionaires

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Hi Sailfar
Does it make sense to have Jordan series drogue chainplates made from Ti with Ti bolts for a FG hull ? Typical designs for such stern attachments are (very UGLY ) SS 316L plates ľ x 2.25 x 18 inches attached with six 3/8 bolts !
Christian
Hi Christian
I have seen those and they aren't very pretty! It alway makes sense to choose Ti over SS due to much improved longevity, strength and appearance.

Why don't we work together on a prettier design without visible bolts? The bolts can be welded on the inside of the plate, leaving only the two flush mirror polished chainplates visible from the outside. We can also play around with the shape of the plates to make them more visually appealing.
Let me know what you think!
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Old 07-12-2017, 06:26   #19
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Re: Titanium chainplates for non-millionaires

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Hi Christian
I have seen those and they aren't very pretty! It alway makes sense to choose Ti over SS due to much improved longevity, strength and appearance.

Why don't we work together on a prettier design without visible bolts? The bolts can be welded on the inside of the plate, leaving only the two flush mirror polished chainplates visible from the outside. We can also play around with the shape of the plates to make them more visually appealing.
Let me know what you think!
Why not although not sure I am representative... The holes in the chainplate are drilled on the boat, in different places according to the stern boat particular design. Another way is to use countersunk head bolts but this increase the thickness of the part and require to countersunk the hole on the yard... pffff. The other way is to completely change the design. The design of the chainplates for Jordan series drogue depends on the boat displacement and recommended values are public ; it is probably more appropriate to start from the expected loads than from SS design specs....
In retrospect, I could drill the holes on the boat first and send you an 'impression' of the holes...
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Old 07-12-2017, 07:53   #20
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Re: Titanium chainplates for non-millionaires

Following...sounds really good.
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Old 08-12-2017, 03:53   #21
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Re: Titanium chainplates for non-millionaires

Sounds good... PM sent
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Old 14-12-2017, 00:23   #22
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Re: Titanium chainplates for non-millionaires

Here's a link to an interesting article from All At Sea on why stainless steel is the "worst possible material for chainplates": https://www.allatsea.net/the-worst-p...e-chainplates/
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Old 14-12-2017, 14:49   #23
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Re: Titanium chainplates for non-millionaires

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Here's a link to an interesting article from All At Sea on why stainless steel is the "worst possible material for chainplates": https://www.allatsea.net/the-worst-p...e-chainplates/
Well - quite the authoritative author. Brion Toss
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Old 14-12-2017, 16:50   #24
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Titanium chainplates for non-millionaires

A few things about stainless steel.
First the word stainless is similar to saying plastic, it encompasses a lot of different steels, however most do think of 300 series, and in truth there isnít much difference really if you stay in the 300 series.
There is likely much better alloys for chainplates than 300 series SS.
As far as 316L, the L is of no real value unless your welding the chainplates, itís an alloy specifically made to weld, but there isnít any other real advantage.

In short SS isnít really all that bad, just there are better materials is all.

On edit, I donít think grade 2 Ti is much weaker than 316 SS.
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Old 14-12-2017, 21:56   #25
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Re: Titanium chainplates for non-millionaires

a64pilot you are quite correct. The vast majority of sailboat chainplates were fabricated from either 304 or 316 grade stainless steels.
Interestingly, saying something is "stronger" or "weaker" is also similar to calling a material "plastic".
There are many criteria in determining the strength of a material, such as tensile strength, shear strength etc. However, rig fittings do not fail because they were not "strong" enough. They fail because of corrosion (pitting or crevice) and fatigue.
We use Titanium alloy grade 5, which is also widely used in the aerospace industry. Although it scores higher on all "strength" measurements than common stainless steel grades, its suitability for marine application lies in its extreme resistance to corrosion and fatigue.

This grade of titanium is also far more elastic (measured by Young's Modulus) than stainless steel, resulting in a more "springy" material. This makes it very resistant to fatigue with a much lower crack propagation rate than say, 316 SS which is very brittle.
Even grade 2 Titanium, which is slightly "weaker" than 316, is very suitable for chainplates, because of its resistance to corrosion and elasticity.
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