High speed craft

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The Northern Lights catamaran in Borkum
An older hydrofoil
US Naval Forces catamaran ship

A high speed craft (HSC) is a watercraft that reaches a certain speed compared to the water displacement it has with the highest permissible total weight and idle drive. The limit to the HSC is defined by a power function , for example 10  around 20  km / h or 11  knots , 100 m³ around 29 km / h or 15 knots, and 1,000 m³ around 42 km / h or 23 knots 10,000 m³ and around 62 km / h or 33 knots demands. That the top speed of a small boat and a large ship does not mean the same thing corresponds to the traditional limits of hull speed .

An HSC is often not just a displacer , but also a hydrofoil or hovercraft , for example .

Special rules apply to an HSC. These were first introduced in the late 1970s for vehicles using dynamic buoyancy , and in the mid-1990s they were expanded to include vehicles with static buoyancy .

The two hulls of catamarans are less aerodynamic than a single larger hull at low speeds, but cheaper at high speeds, and allow the traditional hull speeds to be increased to up to 35 knots at 35 m in length and up to 58 knots at 110 m in length. Machine-powered catamarans for high speeds were first developed in Norway since the 1970s and represented around 60% of all high-speed ferries by 2010 . A catamaran can be a comparatively robust and low-maintenance HSC. However, Small Waterplane Area Twin Hulls require mechanisms to stabilize them at high speeds. Some catamarans are also hydrofoils.

Individual evidence

  1. Internationale Maritime Organization (Ed.): International Code of Safety for High-speed Craft . 1995, p. 8-9 ( Google Books ).
  2. International Regulations for High-Speed ​​Craft - An Overview. (PDF; 59 kB) International Maritime Organization, June 2005, accessed on November 12, 2014 .
  3. ^ A b Liang Yun, Alan Bliault: High Performance Marine Vessels . Springer Science + Business Media , New York 2012, Catamarans and Multihull Craft, p. 203-256 ( Google Books ).
  4. Odd Magnus Faltinsen: Hydrodynamics of High-Speed ​​Marine Vehicles . Cambridge University Press , New York 2005 ( Google Books ).
  5. 61 ′ Chilkat Express. All American Marine Inc., accessed November 12, 2014 .