The Spiral is a type or class of sailing dinghy. It is similar to a Laser (dinghy), but smaller and easier to manoeuvre on land and in the water, and suited to a skipper of smaller body weight and more fun to sail in heavier conditions than is a Laser …

Jan 11, 2025 · For younger children and training fleets, there is a 5.6m2 small sail option. The Spiral Clan. In the spiral fleet, teenage sailors and women and men of all ages enjoy close racing.

It takes into consideration the displacement and sail area of main and jib. 100% fore-triangle only, no overlapping sails. Chris White, “The Cruising Multihull”, (International Marine, Camden, Maine, 1997), states that a boat with a BN of less than 1.3 will be slow in light winds.

Spiral allows three-dimensional sails to be placed on the Desman model before wind pressure or load are applied. Every dimension of the sail can be precisely adjusted. Warps defines the material composition of the sail.

The Spiral is an affordable single handed sailing dinghy suitable for all types of sailors. For more information go to www.spiralsailing.org. Bare hull = $5700. Standard colours with bailer and hatches. Fitted hull = $6600. As above with fixed fittings, non padded leaning strap and cam cleats for the controls on the deck.

Spiral is a 3.9 m monohull sailboat designed by Alan Warwick and built by Modern Concept Yachts (NZ) starting in 1973. The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement.

× Capsize Screening Formula CSF = Beam ÷ (Disp in cubic ft)^(1/3) Designed to determine if a boat has blue water capability. The CSF compares beam with displacement since excess beam contributes to capsize and heavy displacement reduces capsize vulnerability.

Sep 11, 2007 · When reefing, there are two parts of the sail that need to be held down - the tack and the clew. The tack is held down by the hooks on the front of the boom. The clew lines need to be re-run.

First sail after cleaning. Boat had not been used for 27 years. It will now be used by The Cropwell Bishop Cub Scouts. This is probably the only Spiral in En...

We are now able to offer a new range of high quality,affordable sails for the Spiral which are made to the class specifications. These sails are made from Challenge (USA) 3.8oz dacron and are guaranteed to measure to class specs. We also offer compatible parts …