Hardchine Construction using Diagonal Planking

by Roger Doran
(Barnstaple Devon UK)

I may be getting a substantial quantity of ex-laboratory teak worktops this summer.

The tops are 750mm wide and 27mm thick.

I would like to use this material to build a sailing boat approx. 28ft long by 8.5ft wide, with a centreboard.

I am drawn to a hardchine design similar to a modified skipjack with more deadrise or the
26ft gaff sloop shown as plan no.62 in the Wooden Boats Magazine catalogue.

I intend to apply the planking on the bottom and sides at an angle of 45 degrees to the centreline.

I would appreciate advice on how easy or otherwise it would be to get the planking to confirm to the curves especially the bottom planking towards the bow please, and whether there is any significant advantage in the orientation of the planking in one direction as compared to the other direction.

Comments for Hardchine Construction using Diagonal Planking

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Mar 02, 2015
teak lab benches
by: Anonymous

Sorry to tell you but it is very unlikely that the benches are teak.

In fact it is almost certain that they are not.

Iroko if you are lucky.

Best advice would be to get a sample tested by someone who knows.

Feb 28, 2015
Planking Options
by: Carl Smoot

You should check out the building process called cold molding. This is specifically designed to allow planking to be applied to compound curved hulls.

The basic idea is to apply strips of plywood diagonally to the length of the boat. You do two layers of this with the second layer at 90 degrees to the first layer. Then for the third layer, you apply you finish planking.

The process is used all the time and results in a very strong and light hull.

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