polyester + epoxy

chris

In reply to:

> 1. I made chainplates as in sheet 5 and laminated in the floats. I made also
> carbon chainplates with epoxy as in appendix C. As I know, polyester and epoxy
> are not very "friendly" in the same constructions. How to be? To laminate the
> carbon chainplate to the hull with putty and glue over as described with
> polyester or do i need to finish this with epoxy?

Polyester will not stick to epoxy, so must never be used to tape in or to
epoxy parts. Epoxy will stick to fully cured polyester, so epoxy must always be used to
tape epoxy components into a polyester hull. Polyester must be fully cured
however, and best way to ensure this is to peel ply polyester laminates to
exclude air. Unwaxed polyester resins will not cure fully when in contact
with air.

> But why 225mm, if making the plate a little bit longer, it will reach the hull
> and all the construction will be stronger...or not?

Not necessary - will only add extra weight - feeding the loads down further
into the bulkhead is all that is required.

With Regards,

Ian Farrier
Farrier Marine (NZ) Ltd
Farrier Marine, Inc.