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Sailing hydrofoils achieve boat speeds up to twice the speed of the wind, as did the AC72 catamarans used for the 2013 America's Cup. [20] Ice boats can sail up to five times the speed of the wind. [21] [22] Lateral force is a reaction supplied by the underwater shape of a sailboat, the blades of an ice boat and the wheels of a land sailing craft.
1 – mainsail 2 – staysail 3 – spinnaker 4 – hull 5 – keel 6 – rudder 7 – skeg 8 – mast 9 – spreader 10 – shroud 11 – sheet 12 – boom 13 - mast
The fore royal yard on the Prince William. Prince William's royal yards are the highest and smallest yards on the ship, are made of wood, and are "lifting yards" that can be raised along a section of the mast.
Bought in 1986 for 290 MFIM (approx 48.8 MEUR) [111] with a reported unit price of 2,000 EUR per unit. [112] A follow-up order was done in 1990 for 149 MFIM (25 MEUR). [113] Guided systems 102 RSLPSTOHJ NLAW Sweden United Kingdom: Anti-tank guided missile: 3,000-10,000 [55] Disposable, man-portable, short range predicted line of sight missile ...
The practical upper limit for wooden constructions fast and maneuverable enough for warfare was around 25–30 oars per side. By adding another level of oars, a development that occurred no later than c. 750 BC, the galley could be made shorter with as many rowers, while making them strong enough to be effective ramming weapons. [37]
A radome (a portmanteau of "radar" and "dome") is a structural, weatherproof enclosure that protects a radar antenna. [1] The radome is constructed of material transparent to radio waves. Radomes protect the antenna from weather and conceal antenna electronic equipment from view.
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U-995, a U-Boat of WWII, showing the typical combination of ship-like non-watertight outer hull with bulky strong hull below. A submarine hull has two major components, the light hull and the pressure hull. The light hull (casing in British usage) of a submarine is the outer non-watertight hull which provides a hydrodynamically efficient shape ...