Right Side Up for the First Time!

In his workshop, solo sailor Sven Yrvind turns his experimental plywood test boat right side up for the first time, keeping internal molds in place to preserve hull shape before fitting bulkheads.

In his workshop, veteran solo sailor Sven Yrvind prepares to roll his experimental plywood test boat right side up for the first time. Working alone, the builder faces the delicate task of hoisting and turning the inverted hull without distorting its shape or letting it tip over on the concrete floor.

Rigging the Hoist and Choosing Knots

To lift the boat, Yrvind rigs an overhead chain hoist paired with flush pipes to control the hoisting lines. Selecting the proper knot proves critical for solo handling. Evaluating line security versus the ease of releasing tension later, Yrvind notes that traditional knots present distinct trade-offs: “The bowline becomes too hard. You have to use pliers or something like that.” By comparison, he points to another option: “The best for honest uh garrick bend. Very very easy. But, not so secure.”

Preserving Hull Geometry During the Inversion

Before initiating the lift, Yrvind addresses structural integrity. To prevent the light plywood skin from flexing out of true alignment under uneven lifting tension, he leaves the temporary building molds fastened inside the hull. He explains the sequential strategy: “saving them for the Oceanic version” while maintaining rigidity on the floor. Once inverted and resting on an even keel, he plans to substitute permanent bulkheads section by section at the front and back before removing the center molds.

Releasing Floor Fasteners and Turning Upright

The operation requires freeing the building jig from the workshop floor. Several retaining screws sit tucked beneath the hull in tight clearances. Setting his phone down on the floor to work beneath the frame, Yrvind unscrews each mounting point across the rear and forward sections. With the hull fully detached and secured to the internal molds, he carefully rotates the boat upright onto its keel.

Examining the Interior Volume and Preparing Bulkheads

Resting upright on an even keel, the hull interior becomes accessible for inspection. Yrvind begins organizing his sockets, spanners, and screwdrivers at the bow to unbolt the temporary molds. Measuring the internal layout, he prepares to install permanent transverse bulkheads that will lock in the hull shape permanently.

SpecificationMeasurementDesign Role
Hull Length4.8 meterPlywood test hull
Beam1.3 meterNarrow displacement beam
Sail Area6 square meterTwo masted lugger rig

Frequently Asked Questions

Why did Sven Yrvind keep the molds inside while turning the boat?

Yrvind left the building frames inside the boat during the lift so the plywood hull would not lose its shape before installing permanent bulkheads.

What knot did Sven Yrvind evaluate for line release?

Yrvind evaluated the Carrick bend because it is very easy to untie, contrasting it with a bowline which tightens under load and requires pliers to undo.

What kind of boat is Sven Yrvind building in this project?

He is building a 4.8 meter plywood test boat with a 1.3 meter beam and two masted lugger rig to test design concepts for a future high-latitude ocean cruiser.

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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 4.8 meter 15 and a half feet long. Her beam will be 1.3 meter. She is a two masted lugger with a total sail area of 6 square meter. She will have no rudder but will be steered by adjustable fins. I am planning a cruise in the Southern Ocean to Dunedin NZ.
Subject to change.
Often the 22th every month I do a resume of the project.
I have an illustrated book with good reviews on Amazon. https://www.amazon.se/s?k=yrvind&crid=1549D6PR18BUJ&sprefix=%2Caps%2C112&ref=nb_sb_ss_recent_1_0_recent
If you’re interested in contributing to my experiments links are below.
https://www.paypal.com/donate/?hosted_button_id=53X8NVEA22MBL
Swish 0706200550
Also please subscribe - even if you are not interested in sailing.
For more see Yrvind.com

Right Side Up for the First Time! Location

  • Västervik, Sweden (57.7577,16.6366)
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