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A Flap Rudder (aka a "Becker rudder") [1] is a specific type of multi-section rudder used on boats and ships. The hinged aft section gives the rudder an extra control surface, enhancing its efficiency. According to Kongsberg "A flap rudder produces more side force than a classic rudder of equivalent size.
This construction is called "The Saye's Rigg". Another version of wind vane self steering on sail boats is known as the vertical axis vane and usually, because of the inferior steering force output compared to servo pendulum devices it makes use of a trim tab hung off the rudder to control the course of the boat. The vane spins at right angles ...
In sailing, luffing refers to when a sailing vessel is steered far enough toward the direction of the wind ("windward"), or the sheet controlling a sail is eased so far past optimal trim, that airflow over the surfaces of the sail is disrupted and the sail begins to "flap" or "luff" (the luff of the sail is usually where this first becomes ...
BMW Oracle Racing USA 17 from the 2010 America's Cup, with a rigid mainsail wingsail, and a conventional jib at the fore Forces on a wing (green = lift, red = drag).. A wingsail, twin-skin sail [1] or double skin sail [2] is a variable-camber aerodynamic structure that is fitted to a marine vessel in place of conventional sails.
A ducted propeller, also known as a Kort nozzle, is a marine propeller fitted with a non-rotating nozzle. It is used to improve the efficiency of the propeller and is especially used on heavily loaded propellers or propellers with limited diameter. It was developed first by Luigi Stipa (1931) and later by Ludwig Kort (1934). The Kort nozzle is ...
They often consist of a metal flap that is lowered against the air flow, thus creating drag and reducing dive speed. [ 1 ] In the past, dive brakes were mostly used on dive bombers , which needed to dive very steeply, but without exceeding their red line speed , in order to drop their bombs accurately.
In a touching Secret Santa exchange captured on TikTok, Mary Kate gifts Giuliana a personalized purse with a special message from her late mother
Two manufacturers of Albacores produced boats in 2011 to 2013: Ovington Boats in the UK [17] and Hapco Marine in the USA. [18] The boats were primarily delivered to UK, Canadian and US destinations. Notable earlier manufacturers include Ontario Yachts , Skene, Woof, Kingsfield Marine, Fairey Marine, Grampian Marine, McGruer&Clarke, JD Young ...
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