building with PVC core foam

[signum]

I wish to know if is it possible to work with PVC core foam as plank on frames method similar with marine plywood plank on frames ?
I was thinking just to laminate with epoxy fiberglass a face, let it cures and than to try planking the laminated sheet on frames with fiberglass face up, I mean to be the exterior of hull. Will it have enough flexural strength don't break the PVC foam? I think to Herex C70.90 from Alcan airex which is a good core for small hull projects. I wonder just if the exterior of hull will be enough smooth after the first lamination with fiberglass on the exterior face. I think should be. I know that lamination must be a first layer of resin on PVC , next a layer of chopped mat , resin again, roving fiberglass bi axial, and again resin.
Has anybody other opinion?
Thanks

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[D'ARTOIS]

I don't believe it's a very good idea for a variety of reasons.

If I understand you well, you will use long strips of core (Airex) fasten that to the frames and than laminating the exterior face.

First of all, I do not believe hat you will be able to get a fair hull i.e. that the so called "core planks" will remain straight and will not lex whilst hardening out if laminated.

I don't think you won't get a smooth hull either bu that depends also a bit how you build up the layers whilst laminating.

A 3rd reason not to do it you will not get continuous strength in your laminate because each frame interrupts the continuity of the laminate.

This is how I see it.

[FAST FRED]

However for a repair of a really fine classic ,

with unobtainable woods & workmanship a case for foam planking can be made.

Invert the hull, and with a heavy grinder get the fastenings visable and cut around them.
Number each plank .

Trace the plank shape in Airex , wrap the plank with matt and use a SS meat skewer to hold the plank against --- into the rib where it came from.

When all planking is replaced glass the outside with single skin scantlings.

Fair as you go , and the result will be fast light ,quiet, insulated , and as maint free as any plastic boat.

Downside , Airex is hardly cheaper than Gold!


Got a nice 75 ft'er to do?

FAST FRED

[Ssor]

Check out coreplank it is made by CoreCell, It is two inch wide cove and bead strips made for building boats from moulds just as you would build a wooden boat that was to be covered with fiberglass. It can be obtained in lenths of sixteen feet, about five meters, and in a variety of thicknesses.