Keel keel

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Underwater hull of a sailing yacht with keel keel

A bilge keel is a special form of the keel , the under the hull of a sailing boat mounted ballast body, this weight stability gives and heeling , drift and capsizing reduced or prevented. It consists of a pair of short keel fins attached to both sides of the midship line.

Since keel keelers , yachts with keel keel, can fall dry , this type of boat is popular in the Wadden Sea and in coastal waters with a large tidal range . Kill keels also allow a shallower draft , which is why they are used in addition to swivel keels , lifting keels and keel blades in boat types for shallow water areas. Like the aforementioned keel shapes, chimney keels also facilitate ship transport on a trailer .

Kimmkieler, double keeler and triple keeler

A distinction is made between keel keel and double keel:

The main ballast of the keel keel is located amidships in a central flat keel.
With the double keel, the ballast is alone or predominantly in the keel fins.
3-Kieler

Three-keelers are ships with a central keel and two side keel keel. In the case of flat motor boats in particular, three keels extending over the entire length of the hull are built, which give the ship lateral stability, which is important for work boats in inland and coastal waters (lifeboat, fishing boat).

Three-keelers are rare on sailing ships. The middle keel serves as ballast. The lateral keel fins increase the lateral surface when heeled. If they are profiled accordingly, the keel fins cause hydrodynamic lift to windward on close-wind or half-wind courses and thus reduce the heel or increase the relative sail area.

Hydrodynamic lift

By profiling the keels and their optimal arrangement in the chine of the hull, hydrodynamic lift can be generated to windward when sailing on a close-wind or half-wind course . The German boat designer Helmut Stöberl first applied this principle to the Fighter boat class in 1986 .

Individual evidence

  1. ↑ so Claviez, Wolfram: Seemännisches Dictionary. Bielefeld: Delius Klasing, (3rd edition) 1994; Keywords Doppelkieler , p. 74 and Kimmkieler , p. 190; Schult, Joachim: Segler-Lexikon. Bielefeld: Delius Klasing, (9th edition) 1994; Keywords Doppelkieler , p. 88, Kimmkiel , p. 221 and Kimmkieler , p. 223, treats the terms synonymously
  2. ↑ Schult, keyword Dreikieler , p. 96, mentions a further enlarged lateral surface as an advantage of the construction.

literature

  • Wolfram Claviez: Sailor's Dictionary. 3. Edition. Delius Klasing, Bielefeld 1994, ISBN 3-7688-0853-X
  • Joachim Schult: Sailors Lexicon. 9th edition. Delius Klasing, Bielefeld 1994, ISBN 3-87412-103-8