DESIGN NAME: Chelidone
PRIMARY FUNCTION: Daysailer
INSPIRATION: Our inspiration comes from sailing world and nature. Sea is our passion and we try to pass down its lines and shapes to our projects. But it is not just a pure aesthetic matter, functionality transmission is the real challenge. Innovators are full of questions, nature has answers. Moreover our inspiration is born in our experience in the bio-composite, in the recycling and in the need to find a new course to bring back the nautical design to the users.
UNIQUE PROPERTIES / PROJECT DESCRIPTION: Chelidone joins composite bio materials to high-tech solutions at the same time. The main features of the design are an expandable three-part mainsail, a swallow afterbody, foils and biomimetic rudder. Sailboat is a green vehicle itself, but this time a step forward has been made in this direction. We considered the entire product lifecycle, not only the service phase but the realize phase as well. So balsa wood and flax fiber sandwich composite has been employed for hull and deck construction.
OPERATION / FLOW / INTERACTION: Sailplan and foil are strictly related. Sailing upwind the leeward foil provides additional lift and righting moment in order to minimize heeling angle and wetted surface. Sailing downwind the sail can be opened doubling its surface, becoming perfect to bear away. In light wind conditions, foils are pulled back into the hull to reduce boat drag. The single parts of the sail can rotate separately: sailing windward the panels can twist improving performance and stability according to the needs.
PROJECT DURATION AND LOCATION: Materials research started in 2014 at the University of Padua and finished in 2015. Flax fiber mechanical properties were evaluated in the laboratories of the university as well. Chelidone’s design started in September 2016 and finished in February 2017.
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PRODUCTION / REALIZATION TECHNOLOGY: A strongly innovative composite sandwich is used for hull and deck planking. As a matter of fact, it is composed by flax fiber skins joined to a balsa wood core through epoxy resin impregnation. The boat is produced employing infusion technique at the aim to realize both an extremely lightweight and stiff body. Appendages are made of carbon-epoxy. Double laminated taffeta and dyneema fibers are used to realize a long lasting and lightweight mainsail. The deck is made of recovered teak.
SPECIFICATIONS / TECHNICAL PROPERTIES: L.O.A.: 10,67 m
BEAM: 2,9 m
BEAM W.L.: 2,28 m
DISP: 3341 kg
MAST: 17,30
MAINSAIL:
upwind 72 square m
downwind 140 square m
P: 16,80 m
E: 2,90 m
TAGS: Daysailer, bio-composite, sailing, biomimetic, nature, mainsail, sea, yacht, sport, wind
RESEARCH ABSTRACT: -
CHALLENGE: The hardest part of this project was designing a new kind of boat. We wanted it green all-round, not only during its service but also during the realization itself. So we decreased equivalent CO2 of product life-cycle starting from materials. About this, balsa wood and flax fiber entail a strong benefit in comparison to glass fiber production. Obviously wood would be the best choice in this direction but we wanted to obtain the best performances possible, so we had to find a compromise.
ADDED DATE: 2017-02-19 14:53:29
TEAM MEMBERS (2) : Pietro Barucco and Alessandro Pera
IMAGE CREDITS: Image #1: Creator Alessandro Pera, Upwind, 2017. Image #2: Creator Alessandro Pera, Downwind, 2017. Image #3: Creator Alessandro Pera, Details, 2017. Image #4: Creator Pietro Barucco, Geometry, 2016. Image #5: Creator Pietro Barucco, Sketches, 2016.
Video Credits: Creator Pietro Barucco, Semirotation, 2017.
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