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post #9 of Old 02-26-2013
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Re: Chain Plate Replacement

Originally Posted by overbored View Post
This could be done but the cost would be about 2.5 times the same chainplate in 316 ss and not really any stronger depending the type of titanium you use. Grade 3 is about the same strength or maybe a bit less. grade 5 is a lot stronger but about 6 times the price of 316 ss. yes it will weigh less and it will not corrode but the 316 ss will last another 25 years and most will not keep their all ready 25 year old boat that long. the advantage of using the higher strength Ti alloys is you can engineer it to be the required strength with less material. therefore saving both weight and cost. the problem with that is the total cost will not be less due to the extra cost of re-engineering.
The cost premium for size to size replacement is no where near six times. It really depends on the size we are talking about, but G5 typically runs less than 50% more than 316L. If we are doing a whole boat with say six chainplates, spending the $100 or so to have a NA reengineer the chainplates is commonly more than saved by the reduced cost of the parts.

Of course the idea would be for boat builders to make the switch to titanium from the beginning, so no one would ever have to replace them in the future. For an Island Packet 38 the cost difference would run about $400 on a new boat if IP were to choose to make the switch.

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