So use something like a west system six10 thickened epoxy to bond the new stringer to the old stuff before fiberglassing over?I recommend using epoxy resin for bonding to old polyester, where strength is important. Epoxy bonds with 6x the strength what glassing to old fiberglass.
Same idea.Ive been thinking about that. Do you mean something like a dove tail?
I have seen the difference quoted as much less that 6x. I believe PE is around 20% less strong. Important to consider, but not make or break. The boatworks today guy did a test and I was surprised. Pulled coosa apart before the poly failed.I recommend using epoxy resin for bonding to old polyester, where strength is important. Epoxy bonds with 6x the strength what glassing to old fiberglass.
Yes they will. the aluminum angle will span the joint with the backing plateSame idea.
More like a step. Matching notches that you could glue (thickened epoxy) and screw before glass. A vee notch is also an option but tough in a bilge.
The idea is to create a mating surface that is a structure that is compressing on itself and resists rotational loads and stands up to axial loads.
A butt joint isn't enough in my opinion especially if it is on a stringer that will hold a motor.
Will your engine beds span across the joint?