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Stabilizer (ship)
Ship stabilizers (or stabilisers) are fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a ship's roll due to wind or waves. ''Active fins'' are controlled by a gyroscopic control system. When the gyroscope senses the ship roll, it changes the fins' angle of attack so that the forward motion of the ship exerts force to counteract the roll. ''Fixed fins'' and bilge keels do not move; they reduce roll by hydrodynamic drag exerted when the ship rolls. Stabilizers are mostly used on ocean-going ships. Function Fins work by producing lift or downforce when the vessel is in motion. The lift produced by the fins should work against the roll moment of the vessel. To accomplish this, two wings, each installed underwater on either side of the ship, are used. Stabilizers can be: *Retractable - All medium and large cruise and ferry ships have the ability to retract the fins into a space inside the hull in order to avoid extra fuel consumption and r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fin Stabilizer (ship Front View+)
A vertical stabilizer or tail fin is the static part of the vertical tail of an aircraft. The term is commonly applied to the assembly of both this fixed surface and one or more movable rudders hinged to it. Their role is to provide control, stability and trim in yaw (also known as directional or weathercock stability). It is part of the aircraft empennage, specifically of its stabilizers. The vertical tail is typically mounted on top of the rear fuselage, with the horizontal stabilizers mounted on the side of the fuselage (a configuration termed "conventional tail"). Other configurations, such as T-tail or twin tail, are sometimes used instead. Vertical stabilizers have occasionally been used in motor sports, with for example in Le Mans Prototype racing. Function Principle The vertical tail of an aircraft typically consists of a fixed vertical stabilizer or fin on which a movable rudder is mounted. A trim tab may similarly be mounted on the rudder. Together, their role ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnus Effect
The Magnus effect is an observable phenomenon commonly associated with a spinning object moving through a fluid. The path of the spinning object is deflected in a manner not present when the object is not spinning. The deflection can be explained by the difference in pressure of the fluid on opposite sides of the spinning object. The Magnus effect is dependent on the speed of rotation. The most readily observable case of the Magnus effect is when a spinning sphere (or cylinder) curves away from the arc it would follow if it were not spinning. It is often used by association football and volleyball players, baseball pitchers, and cricket bowlers. Consequently, the phenomenon is important in the study of the physics of many ball sports. It is also an important factor in the study of the effects of spinning on guided missiles—and has some engineering uses, for instance in the design of rotor ships and Flettner aeroplanes. Topspin in ball games is defined as spin about a ho ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blue Origin
Blue Origin, LLC is an American private spaceflight, privately funded aerospace manufacturer and sub-orbital spaceflight services company headquartered in Kent, Washington. Founded in 2000 by Jeff Bezos, the founder and executive chairman of Amazon (company), Amazon, the company is led by CEO Bob Smith and aims to make access to space cheaper and more reliable through reusable launch vehicles. Rob Meyerson led Blue Origin from 2003 to 2017 and served as its first president. Blue Origin is employing an incremental approach from suborbital to orbital flight, with each developmental step building on its prior work. The company's name refers to the blue planet, Earth, as the point of origin. Blue Origin develops orbital technology, rocket-powered VTVL, vertical takeoff and vertical landing (VTVL) vehicles for access to sub-orbital spaceflight, suborbital and orbital spaceflight, orbital outer space, space. Initially focused on suborbital spaceflight, the company has designed, built ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Bronstein (DE-1037)
USS ''Bronstein'' (FF-1037) was the lead ship of her class in the United States Navy. She was named in honor of Assistant Surgeon Ben Richard Bronstein, who was killed in action on 28 February 1942 when was sunk by a German U-boat off Cape May, New Jersey. ''Bronstein'' was commissioned on 16 June 1963 as DE-1037 under the command of Stanley Thomas Counts. She was decommissioned 13 December 1990 and struck from the Navy list on 4 October 1991. ''Bronstein'' was disposed of through the Security Assistance Program as a foreign military sale on 12 November 1993. She was transferred to Mexico Mexico (Spanish language, Spanish: México), officially the United Mexican States, is a List of sovereign states, country in the southern portion of North America. It is borders of Mexico, bordered to the north by the United States; to the so ... on 12 November 1993 where she serves as ARM ''Hermenegildo Galeana'' (F202). References External links *NavSource.org Bronstein ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Gyatt
USS ''Gyatt'' (DD-712/DDG-1), was a in the United States Navy, named for U.S. Marine Corps Private Edward E. Gyatt, a Marine Raider killed in the Battle of Guadalcanal. Namesake Edward Earl Gyatt was born on 4 September 1921 in Syracuse, New York. He enlisted in the United States Marine Corps on 28 January 1942. Private Gyatt was serving with the 1st Marine Raider Battalion during the Battle of Tulagi, part of the initial landings of the Guadalcanal campaign. Part of the invasion force that went ashore on Tulagi on 7 August 1942, Gyatt reported the approach of a Japanese counterattack force on his advanced position that night, he remained at his post and inflicted heavy damage on the enemy until he was killed by a hand grenade. Gyatt was posthumously awarded the Silver Star. The destroyer escort USS Gyatt (DE-550) was named for him but construction was cancelled in 1944 before it could be completed. Service history ''Gyatt'' was built by Federal Shipbuilding and Drydock ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Hamilton (DMS-18)
The second USS ''Hamilton'' (DD–141) was a in the United States Navy following World War I, later reclassified DMS-18 for service in World War II. Namesake Archibald Hamilton was born c. 1790, the son of Secretary of the Navy Paul Hamilton. He was appointed Midshipman on 18 May 1809 and assigned to work with a new kind of hollow shot needed by frigate . He next sailed for Europe on on 31 January 1811 carrying dispatches for American officers in the Mediterranean. On his return to the United States, Hamilton was assigned to on which he won commendation from his commanding officer, Captain Stephen Decatur, for gallantry in action during the capture of British frigate on 25 October 1812. Decatur selected him to bear the captured British flags to Washington. Appointed Acting Lieutenant on 21 December 1812 and Lieutenant on 24 July 1813, Hamilton served throughout the War of 1812, only to be killed shortly after the Treaty of Ghent had formally ended the war. Because of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Osborne (DD-295)
USS ''Osborne'' (DD-295) was a in the United States Navy following World War I. She was named for Weedon Osborne. Naval Service ''Osborne'' was laid down 23 September 1919 at Bethlehem Shipbuilding Corporation, Squantum, Massachusetts; launched 29 December 1919; co-sponsored by Mrs. Elizabeth Osborne Fisher, sister of Ltjg W. E. Osborne and Mrs. C. H. Cox; and commissioned 17 May 1920. Commissioned into a peacetime navy curtailed by a retrenching Congress, the undermanned four-stacker departed Boston, Massachusetts 25 June to join DESRON 3, Atlantic Fleet. The limited coastal operations of 1920 were supplemented by 2 months of fleet exercises and battle problems off Cuba during the first quarter of 1921. Whether operating out of Charleston, South Carolina, her normal base of operations, or out of the Brooklyn or Philadelphia Navy Yards ''Osborne'' regularly steamed southward early each year for these competitive exercises and large scale tactical maneuvers. These useful te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Director (military)
A director, also called an auxiliary predictor, is a mechanical or electronic computer that continuously calculates trigonometric firing solutions for use against a moving target, and transmits targeting data to direct the weapon firing crew. Naval warships For warships of the 20th century, the director is part of the fire control system; it passes information to the computer that calculates range and elevation for the guns. Typically, positions on the ship measured range and bearing of the target; these instantaneous measurements are used to calculate rate of change values, and the computer ("fire control table" in Royal Navy terms) then predicts the correct firing solution, taking into account other parameters, such as wind direction, air temperature, and ballistic factors for the guns. The British Royal Navy widely deployed the Pollen and Dreyer Fire Control Tables during the First World War, while in World War II a widely used computer in the US Navy was the electro-mechanical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Servomotor
A servomotor (or servo motor) is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servomotors. Servomotors are not a specific class of motor, although the term ''servomotor'' is often used to refer to a motor suitable for use in a closed-loop control system. Servomotors are used in applications such as robotics, CNC machine, CNC machinery, and automated manufacturing. Mechanism A servomotor is a closed-loop controller, closed-loop servomechanism that uses position feedback to control its motion and final position. The input to its control is a signal (either analogue or digital) representing the position commanded for the output shaft. The motor is paired with some type of encoder (position), position encoder t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flywheel
A flywheel is a mechanical device which uses the conservation of angular momentum to store rotational energy; a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assuming the flywheel's moment of inertia is constant (i.e., a flywheel with fixed mass and second moment of area revolving about some fixed axis) then the stored (rotational) energy is directly associated with the square of its rotational speed. Since a flywheel serves to store mechanical energy for later use, it is natural to consider it as a kinetic energy analogue of an electrical inductor. Once suitably abstracted, this shared principle of energy storage is described in the generalized concept of an accumulator. As with other types of accumulators, a flywheel inherently smooths sufficiently small deviations in the power output of a system, thereby effectively playing the role of a low-pass filter with respect to the mechanical velocity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Henderson (AP-1)
The first USS ''Henderson'' (AP-1) was a transport in the United States Navy during World War I and World War II. In 1943, she was converted to a hospital ship and commissioned as USS ''Bountiful'' (AH-9). Named for Marine Colonel Archibald Henderson, she was launched by Philadelphia Navy Yard on 17 June 1916; sponsored by Miss Genevieve W. Taylor, great-granddaughter of General Henderson; and commissioned at Philadelphia, Pennsylvania on 24 May 1917. Service history World War I, 1917–1918 ''Henderson'' arrived New York on 12 June 1917 and sailed two days later with Rear Admiral Albert Gleaves' Cruiser and Transport Force, which carried units of the American Expeditionary Force to France. In her holds she had space for 1,500 men and 24 mules. Reaching Saint-Nazaire on 27 June she disembarked troops and returned to Philadelphia on 17 July 1917. Subsequently, ''Henderson'' made eight more voyages to France with troops and supplies for the allies in the bitter European fightin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Worden (DD-16)
The first USS ''Worden'' (DD-16) was a in the United States Navy. She was named for Admiral John Lorimer Worden. It was the first US ship equipped with a stabilizer. Built in Sparrows Point, Maryland ''Worden'' was laid down at Sparrows Point, Maryland, on 13 November 1899 by the Maryland Steel Company; launched on 15 August 1901; sponsored by Mrs. Daniel F. Worden, the daughter-in-law of Rear Admiral Worden; and commissioned on 17 March 1903, Lieutenant Benjamin B. McCormick in command. Pre-World War I ''Worden'' passed her final acceptance test on 18 July and began duty with the 2nd Torpedo Flotilla, based at Norfolk, Virginia. For more than four years, she remained a unit of the 2nd Torpedo Flotilla and conducted operations along the eastern seaboard from Maine south to the Caribbean and the Gulf of Mexico. Annually, she participated in the Fleet maneuvers held in the warm waters of the Caribbean. On 18 November 1907, the warship was placed in reserve at the Norfolk N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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