Comentarii la: Placi de lant din fibra de carbon??? | Înțelepciunea navigată [S6 Ep1]

De: @johnbenker1347

@johnbenker1347 — Thu, 07 Mar 2024 17:41:43 +0000

Hot dip galvanize perhaps…

De: @dougsrepair1060

@dougsrepair1060 — Thu, 07 Mar 2024 02:10:05 +0000

Carbon fibre would certainly take care of the corrosion issues. Why not run the carbon fibre component all the way up through the deck and to the rigging.

De: @IxnayMalarkavitch

@IxnayMalarkavitch — Thu, 07 Mar 2024 00:40:27 +0000

That’s a hard no from me. Carbon fiber is impact sensitive. Whack the top of one of those chain plates on a dock, it’s compromised. Plus you are relying on the interlaminant bond of 40 year old fiberglass. To hold a pretty big spar in place in a hurricane. Others have mentioned lightning so I won’t bother. Bronze is incredibly durable. It tolerates moderate deformation. It’s slightly malleable. Some jerk with a cruddy anchor winds up along side you in a blow, while bronze might bend a little and you’re like, might be able to bend it back with a mallet instead of oh. Now we got to tear all that glasswork out to replace a Chainplate.
Lastly you can bolt those on with stainless. Check one every five years.
Regarding the bottom bolt in a chainplate. You said you are supposed to leave 20 times the diameter of the fastening below the last bolt?

De: @Frustino

@Frustino — Wed, 06 Mar 2024 16:20:46 +0000

It's super strong, just don't make a submarine out of it.

De: @twohalf-hitches

@twohalf-hitches — Tue, 05 Mar 2024 15:43:22 +0000

We just redid ours in 316, but I think our next set will be titanium. The raw flat patterns for grade 5 titanium were about double the cost of steel but that's going from about $40 each to $80 each, and then the added cost of heat treatment after forming only adds a marginal amount to the final total. Carbon fiber will be cool to see though!

De: @michaelsimpson9779

@michaelsimpson9779 — Tue, 05 Mar 2024 09:14:56 +0000

Bronze to the topside? Did I hear that right? What's with the copper bonding lug? Lightning protection or just a common earth bond? Will the bronze be up to the cyclic loading? If that's the overall intention…?

De: @daveg4963

@daveg4963 — Tue, 05 Mar 2024 05:24:04 +0000

Yes

De: @pl7868

@pl7868 — Mon, 04 Mar 2024 14:05:22 +0000

Carbon fiber is very good at some things not so good at others , it's no good at all for being shocked as in what happens when you loose a stay an the mast is whipping around , also you have an old boat the glass on it has water in it will be very hard to get a good bond in the first place and would take an engineer to design the fix if it is going to have any chance of being reliable , you may think your boat is overbuilt but there was a reason the designer brought the chain plates down to the floors and keel , I wouldn't try to out think him , just use stainless steel run them down where they belong , won't cost much but will be some work and call it a job well done , stainless is cheap and strong and you can make your own from flat stock , will probably last until your an old man , IMHO

De: @EngineerK

@EngineerK — Mon, 04 Mar 2024 12:20:00 +0000

Something to think about is the stress strain curve for CF. Steel has a yeild plateau where you can continue stretching it after it riches its yield stress (by about 250%) – hence a ductile material. CF will tend to have a linear curve to failure ie. When yield is reached it fails. From this perspective I think CF chain plate needs to be designed for higher force (1.5 or 2x the yield capacity of your stay?). The chain plate cannot be the weak link in the system and it's lack of a yield plateau has to be considered in the design of the rigging system (you always want the failure point to be in the ductile component of the system ie. the stay).

De: @johncollins5021

@johncollins5021 — Mon, 04 Mar 2024 10:38:05 +0000

Sorry I missed your zoom chat. I have worked with carbon fiber for 34 years in the aircraft industry.