Glassing a lapstrake plywood hull
Posted 19 August 2010 - 11:54 AM
I intend to build a lapstrake plywood boat (cape Henry 21). The desiegner, Dudley Dix, recommends you not glass & epoxy the hull as it is tricky getting the cloth to lay properly on a "lapstrake detail". That said, some have used a ligh5t weight glass to sheath the hull. I would like to do the same. An option is Dyanol??? I think it is called. That material supposedly conforms to adverse shapes better.
Any thoughts or opinions on the above would be much appreciated. thanks.
Posted 19 August 2010 - 04:13 PM
If you want protection, then 'glass the "flats", but leave the lap clear. I've used 6 to 12 ounce cloth on lapped hulls, but only on the exterior of the plank. The end grain portion of the plank was left clear. In fact I 'glassed before final trimming, cutting both the plank and 'glass sheathing to a fair line.
Dynel or Xynole could be used, but they have the same requirements as cloth, though you can get away with a smaller radius.
Posted 20 August 2010 - 11:17 AM
Posted 20 August 2010 - 07:50 PM
Posted 22 August 2010 - 05:43 PM
Fitting the strakes takes a bit of trial fitting and having to deal with a layer of glass just makes that job a lot harder. Thousands of lapstrake boats have survived without this complication. My best advice is to forget about sheathing it.
Edited to add: In case it was not clear, I don't think much of Dynel as a sheathing material. In fact, I find no use for it at all since there are other easier and cheaper options for non skid situations. In my testing of the various sheathing materials, Dynel performed very poorly compared to the visibly similar, but far superior, Xynole.