Big and small are different Bonos Tanso peel ply.
Today I again try to explain why I do not make the bulkhead hatches so they can close from the inside. It is a complication, I like to keep things simple. Some people say that will be good if the hull gets penetrated. But in my world the hull of Exlex will never get penetrated. How can I be so sure of that. Several reasons. Exlex is way more strong than even a big boat. She has a Divinycell core 70 mm thick. 60 feet long boats use 20 mm seldom more. Alsos she have her inner laminate of 600 gram carbon fibre. That also makes her hull very strong as I show with the test samples. It is important to have the carbon on the inside.
Then in general small things are much stronger than big ones to global forces as Galoleo found out, the square cube law, a low that governs all structure. To design without it is not good engenering but most engeniers live in their bubble and consider only big boat. They do not understand that a small boat becmes differnt structurally because of size. I took the example of balloning spiders as an example. A spider can fly hundreds of kilometer by a tread they spin out. Humans are different we had to invent airplanes.
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Sven Yrvind
At 86, Sven Yrvind is still pushing the limits of small-boat design. Discover the philosophy and technical grit behind his 'Exlex' series.
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The Outer Coaming and Fiberglassing the Inner One.
Sven Yrvind fits the outer spray skirt coaming and laminates fiberglass onto the inner coaming in his workshop, refining his rope attachment setup and filleting the joint defenses.
Starting the Inner of Two Spray Skirt Coamings.
Sven Yrvind works in his workshop cutting and fitting inner and outer spray skirt coamings, detailing kerf measurements and fiberglass reinforcement.
Cutting the Divinycell Bulkheads.
In his Västervik workshop, Sven Yrvind shapes composite bulkheads and constructs rounded hatch coamings with dual spray protection for his compact ocean cruiser, verifying hull symmetry and deck crown alignment.
Laminating the Two Bulkheads.
Sven Yrvind numbers and lays out fiberglass cloth before laminating two bulkheads with epoxy resin in his Västervik workshop for his 4.5-meter high-latitude cruiser test boat.
Starting the Two Divinycell Bulkheads.
In his Västervik workshop, Sven Yrvind lays out two test bulkheads inside a plywood mockup, adjusting semicircular access cutouts and planning insulated Divinycell sandwich bulkheads for his upcoming ocean cruiser.