glassing clinker plywood

[Anders]

Hi
Has anyone glassed the outside of a clinker plywood plywood hull?

In oughtreds book he say that its not possible, but its some years old.
I´m going to build clinker use¡ing some pretty soft plywood (softer than okume) and there are many places with rocks, stones and pebbles here. I was thinking about glassing with a very thinn cloth: 86gr m2. Would that be a good idea or would it be better to just give the hull 3 - 4 coats of epoxy?

[Port-Na-Storm]

Hi Anders,
I haven't tried it, and would want to avoid it if possible.
The thing you don't want to lose is those crisp plank edges. I think you would have to glass each plank individually which would be difficult although not impossible.

Damage from abrasion is likely to occur on the edges of the planks and the keel, a couple of bilge runners and some metal protection will help considerably.

On both my clinker ply boats I ran a fillet of thickened epoxy along the plank lands to stop water getting in the end grain and to strengthen the edge.

Don't forget Iain O sails mainly in Scotland where they also have lots of rocks etc.

Graham.

[Forthsailoar]

I glassed the (flat) bottom and the lowest plank of my Welsford Walkabout. 

No need to glass higher, it will add weight for no benefit. 

The junction of the bottom and first plank is fairly shallow so I was able to take the glass over the joint. I think glassing over the laps of clinker would be very fiddly, but no reason you couldn't glass each plank individually. 

Cheers 

Osbert

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On 21 Sep 2011, at 16:31, "Anders [via UK HBBR Forum]" <[hidden email]> wrote:

Hi
Has anyone glassed the outside of a clinker plywood plywood hull?

In oughtreds book he say that its not possible, but its some years old.
I´m going to build clinker use¡ing some pretty soft plywood and there are many places with rocks, stones and pebbles here.

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[Forthsailoar]

I should have added - I was following John Welsford's plans when I glassed my walkabout.

Osbert

[Anders]

Thanks

I have decided NOT to glass. I will coat in epoxy, seal endgrain of the planks with thin epoxy and run a fillet as Graham described.

[Zimmerman]

There is no problem in sheathing boats even with complex profiles. The secret is just to use surface tissue and not to wet out beforehand. Cut the tissue into manageable pieces and tack them to the wood, making sure to overlap any edges. Then apply resin with a roller and push the wet tissue into the lands with a brush if necessary. It's worth trying on a small area first as the technique requires practice to get a decent finish. The result is a watertight, hard surface.