The number of records for exploring our water-covered planet is limited only by one’s wild imagination…first to sail solo nonstop around the world, first to do the deed the “wrong way,” first to row across an ocean, and now, first to sail to the North Pole. It has been 109 years since Robert Peary, accompanied by Matthew Henson and four Inuit women, claimed to have reached the celebrated point (the wobbling of Earth’s axis makes a precise fix uncertain), or was it Frederick Cook a year earlier?
No matter; neither employed a sail.
This year, Frenchman Sébastien Roubinet and two crew plan to sail a hybrid iceboat/sailboat 1,620 nm from Alaska to Spitsbergen, stopping to visit Santa Claus along the way. French composites company Resoltech has provided materials for the several iterations of the boat, called Babouche (after the Moroccan heelless slipper). During trials, the first, measuring 24‘9“ x 16‘10“ (7.5m x 5.1m), was deemed too heavy, so a 16‘ (4.9m) version was tested on James Bay, and then, in 2011, an 18‘ (5.5m) version sailed for 45 days in Alaska. Employing basalt fibers, Innegra (a lightweight high-performance olefin fiber; www.innegratech.com), and Resoltech’s “flexible epoxy system” R1600/1606 helped reduce the weight of the third one—a 20‘ (6.1m) prototype—to just 330 lbs (150 kg). That served as a platform for Roubinet to gain experience over two months on the Arctic Ocean, prompting a redesign: Babouche 2 is 22‘11“ (7.0m) long and 7‘10“ (2.4m) wide. Sail area is 484 sq ft (45m2); off the wind it expands to 914 sq ft (85m2). Weight is 440 lbs (193 kg).
For sailing on ice, the boat rides on two slides made of carbon/Innegra/basalt, and Resoltech 1020, engineered for flexibility and elongation. The skins of the pneumatic hulls were laminated with Innegra and basalt fibers, using 1600/1606 epoxy. The hulls must be able to withstand significant impacts as they bounce over cracks and sharp ice features, as well as changes in inflation pressure.
Resoltech engineer Valery Loriot says Roubinet “used a unique epoxy system, which is actually two epoxy systems blended together. One is rigid, and the other one is flexible. The hulls of the boat are made of two buoys [tubes], each one made with a skin of carbon/semi-flexible epoxy. So we tested the mechanical traction value of nine blends of the two systems.”
According to the company’s published lab results, the blend of its 1050 and 1600 systems can set elongation between 4.5% and 80%. The samples were post-cured at 240°F (116°C) for 16 hours, though cure at room temperature is possible. Also, by altering the ratio of one epoxy to the other, hardness, modulus, and strength can be similarly adjusted over a considerable range.
Our contributing editor in France, Jean-Yves Poirier, who documented the build, elaborated: “Sébastien made the floats by hand, shaping a large piece of foam, and then laying up carbon reinforcements all over with a soft epoxy matrix to resist inflation pressure. He then had to destroy the polystyrene plug from the inside to get an empty float and close the transom to make it airtight as an inflatable tube. Everything—mast, cabin, rudders, and skis—is carbon, made with wet laminations by Sébastien but with the help of some prepreg fabrics, in the mast, for example.”
According to Resoltech’s newsletter, “Mechanical properties have been achieved at room temperature in order to simplify laminating. Elasticity was easy to control, in combination with [the] 1050 system. Other structural parts, such as the platform, cabin, and mast, have been laminated with carbon prepregs and put together with 3350 adhesive, a mixture highly resistant to shear and peel strength. Its greasy texture and thixotropy [the property of becoming fluid when disturbed, i.e., by shaking] made application easy, without sagging or sinking troubles.”
Roubinet wrote to us: “The North Pole expedition will leave Prudhoe Bay June 15 for two or three months, to include Alaska, Pole of Inaccessibility, Magnetic Pole, and Geographic Pole. Arrival is planned in Spitsbergen. During the expedition we are going to make numerous ice thickness measurements and take samples for pollutants and microplastics. My crew includes two others: Eric André, who accompanied me for the Northwest Passage, is a highlander, living in Sweden for the last 15 years, and is currently finishing a family round-the-world trip on bicycles; and Vincent Colliard.” The latter has a long list of successful Arctic adventures over the last 10 years.
Resoltech manufactures a wide variety of advanced resin systems, including laminating, casting, prepregs, clear coats, injection molding, and infusion, as well as reinforcements and other composite materials.
Resoltech, 249 Avenue Gaston Imbert Zi de Rousset, Rousset 13790, France; tel. +33 (0) 4 42 95 01 95, website www.resoltech.com.