Modern asymmetricals tacked to the stem are designed to rotate area to weather of the centerline. At these angles and velocities, the sail has trouble being blanketed by the mainsail. The problem for most asymmetricals, particularly on conventional displacement monohulls, comes in 10-14 knots of breeze when trying to sail at broader angles (more than 135 degrees apparent). Angles as close as 50 degrees apparent are not uncommon in less than 9-10 knots of wind. The lighter the air, the closer to the wind you will be able to sail, regardless of the design. The trick is to strike the right balance for the intended usage, or to have several asymmetricals for different purposes. More spinnaker-like (symmetrical) shapes are larger, fuller sails, optimized for broad reaching and running. The flatter and more genoa-like (asymmetrical) the sail, the closer to the wind it can be carried. This is a function of design, materials, construction, and, ultimately, of breeze velocity. In general, they are better reaching sails than conventional symmetrical spinnakers, though they can be designed for sailing at broad angles.Īt what wind angles can an asymmetrical be carried? An asymmetrical typically has a rounder entry (luff) and flatter exit (leech). The position of maximum camber (draft) is likely to be forward of 50 percent. Second, the cross-sectional shaping is not uniform and semi-circular – as it would be with a spinnaker – but asymmetrical. The tack is always the tack, and both sheets are tied onto the same corner (the clew), just like a genoa. What makes an asymmetrical spinnaker different from a standard spinnaker?įirst, geometry: an asymmetrical has a distinct luff and leech. For questions or more detailed information on asymmetrical spinnakers, contact a Quantum Sail Consultant. ![]() ![]() The fundamental principles of asymmetrical trim are outlined in this guide. Quantum’s spinnakers have been developed to provide downwind power for every type of situation. Using sophisticated design tools for off-wind sail development, wind tunnel testing, and the expertise of designers, technologists and manufacturing experts from industry and academia. The Quantum asymmetrical is designed and engineered to be easy to set and trim, whether racing or cruising. Quantum expert Dave Flynn walks through what makes an asymmetrical kite special, why that matters for sail handling, and how to properly trim it. ![]() Asymmetrical spinnaker trim is the third part in our series on cruising sail trim.
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