Freestanding mast on deck that do not interfere with the accomodation. The bedroom in this case.
The original idea of the side by side masts was that they should not interfere with the accomodation. They proved excellent for downwind sailing also in combination with a bow centerboard.
Now the bow centerboard is replaced by ballasted twin keels. That makes the lateral area fixed. This calls for the need of movabel sail center.
Three masts in line solves that problem.
Having once used freestanding masts I do not like to go back to supported masts.
As for to not interfeer with the accomodation the masts are supported below the sail.
If I remember right a rule of tumb calls for one tenth of the mast to supported if not the forces be to big on the supporting bearings.
The edge of the 2.7 square meter sail is 1.65 the mast do not need to be more than 1.95 meter above the upper support. A 50 cm tube on deck with supports to the deck house will make the structure strong enough.
If you make something strong enough it will not break.
The boat is small and the sail is only 2.7 square meter I belive this structure will be ample strong.
For more see Yrvind.com
There you can support my project with donations via Pay pal or Swish 0706 200 550
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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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Mockup – No Ballast, Deckhouse Buoyancy for Self Righting
This Youtube channel is about me Sven Yrvind. I am 87 and a half years old dyslectic solo sailor. I am building a plywood test boat for a Divinycell and NM-epoxy high-latitude cruiser. She will be about 4.5 meter or 14 feet and 9 inches long, the beam 1.36 meter, 4 feet 6 inches. She is a two mas...
The two bulkheads weakly installed.
This Youtube channel is about me Sven Yrvind. I am 87 and a half years old dyslectic solo sailor. I am building a plywood test boat for a Divinycell and NM-epoxy high-latitude cruiser. She will be about 4.5 meter or 14 feet and 9 inches long, the beam 1.36 meter, 4 feet 6 inches. She is a two mas...
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.