wood

More S860 crossbeams: Centre bearing blocks

The Starwind 860 trimaran's crossbeams are joined on the boat's centreline by a massive hinge pin. This mechanism ensures that the two outriggers fold in sync. The peak load on the centre bearing could be up to 41 kN (about four tons) port-starboard or 11 kN up-down, and the structures around it need to reflect that.

Making the best of mediocre wood

Boatbuilders like to have really good wood. The best stuff is quarter sawn, vertical grain, air dried two years, felled by ceremonial beaver at midnight under a full moon.

What you actually get, especially when buying in small quantities from lumberyards that are unfamiliar with boatbuilding, is plain sawn, a bit warped, and often a bit wet, like the batch of western red cedar I'm using for various small parts of the Starwind 860 power trimaran.

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