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Tri-star (wheel Arrangement)
The tri-star is a novel wheel design—originally by Robert and John Forsyth, assigned to Lockheed in 1967—in which three wheels are arranged in an upright triangle with two on the ground and one above them. If either of the wheels in contact with the ground gets stuck, the whole system rotates over the obstruction. Design In the tri-star wheel, all three satellite wheels are simultaneously powered through a mechanical linkage between each satellite wheel and a shaft concentric with the central hub. In the original patent, the direction of the vehicle is controlled through the differential steering. Applications Lockheed modified an M2A2 105mm Light Howitzer and produced it from 1969-1977 with a drive unit and tri-star wheel system into an Auxiliary Propelled Howitzer they termed "Terra Star." The only surviving prototype is located at the Rock Island Arsenal Museum. Its most famous application was the Landmaster, a unique armoured personnel carrier (APC) from the 1977 film ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lockheed Corporation
The Lockheed Corporation was an American aerospace manufacturer. Lockheed was founded in 1926 and later merged with Martin Marietta to form Lockheed Martin in 1995. Its founder, Allan Lockheed, had earlier founded the similarly named but otherwise-unrelated Loughead Aircraft Manufacturing Company, which was operational from 1912 to 1920. History Origins Allan Loughead and his brother Malcolm Loughead had operated an earlier aircraft company, Loughead Aircraft Manufacturing Company, which was operational from 1912 to 1920. The company built and operated aircraft for paying passengers on sightseeing tours in California and had developed a prototype for the civil market, but folded in 1920 due to the flood of surplus aircraft deflating the market after World War I. Allan went into the real estate market while Malcolm had meanwhile formed a successful company marketing brake systems for automobiles. On December 13, 1926, Allan Lockheed, Jack Northrop, John Northrop, Kenneth K ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Differential Steering
Differential steering is the means of steering a land vehicle by applying more drive torque to one side of the vehicle than the other. Differential steering is the primary means of steering tracked vehicles, such as tanks and bulldozers, is also used in certain wheeled vehicles commonly known as skid-steer, and even implemented in some automobiles, where it is called torque vectoring, to augment steering by changing wheel direction relative to the vehicle. Differential steering is distinct from torque steer, which is usually considered a negative side effect of drive-train design choices. History A British agricultural company, Hornsby in Grantham, developed a continuous track, which was patented in 1905. The Hornsby tractors featured a track-steer clutch arrangement. Mechanisms There are several mechanisms that have been developed to vary the torque applied to different sides of a vehicle. These include ''clutch-brake'' steering, ''braked-differential'' steering, ''cont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M101 Howitzer
The M101A1 (previously designated M2A1) howitzer is an artillery piece developed and used by the United States. It was the standard U.S. light field howitzer in World War II and saw action in both the European and Pacific theaters and during the Korean War. Entering production in 1941, it quickly gained a reputation for accuracy and a powerful punch. The M101A1 fires 105 mm high explosive (HE) semi-fixed ammunition and has a range of , making it suitable for supporting infantry. All of these qualities of the weapon, along with its widespread production, led to its adoption by many countries after the war. Its ammunition type also became the standard for many foreign countries' later models. History Development and designation After World War I, the U.S. Army Ordnance Department studied various captured German 105 mm-caliber howitzers and developed the 105 mm Howitzer M1920 on Carriage M1920. A box trail carriage design (the M1925E carriage) and two other split trai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Island Arsenal
The Rock Island Arsenal comprises , located on Arsenal Island, originally known as Rock Island, on the Mississippi River between the cities of Davenport, Iowa, and Rock Island, Illinois. It lies within the state of Illinois. Rock Island was previously used as the summer camp site for Sauk Native Americans, and the dispute over tribal ownership led to the Black Hawk War of 1832, after the primary leader of the Sauk, Black Hawk. It is now home of First Army headquarters, and the US Army's Center of Excellence for Additive Manufacturing. ASA(ALT)br>Assistant Secretary of the Army (Acquisition, Logistics and Technology) (Friday, October 4, 2019) Army Advanced Manufacturing InitiativeRyan McCarthy (18 September 2019) Army Directive 2019-29 (Enabling Readiness and Modernization Through Advanced Manufacturing)This directive is to be implemented by Materiel Command and Futures Command; the proponent will be ASA(ALT)Mark Esper (07 Dec 2018) Army Directive 2018-26 (Enabling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landmaster
The Landmaster is a unique 12-wheeled amphibious articulated vehicle constructed by Dean Jeffries at Jeffries Automotive in Universal City, California, for the 1977 science fiction film ''Damnation Alley''. Despite the appearance of two Landmasters in the film (achieved with process photography and models), only one was built, at a cost of $350,000 in 1976. History A staple of southern California car culture for many years, the Landmaster was parked in full view next to Dean Jeffries' automotive shop on Cahuenga Boulevard in North Hollywood, California from 1977 to 2005. The Landmaster was sold to a private owner in 2005 and was restored to its original condition as featured in ''Damnation Alley''. The Landmaster was then on the show car circuit for several years. In 2007 it was featured at the ''San Francisco Rod & Custom Show'' at the Cow Palace in San Francisco as part of special exhibit with other notable movie and TV cars. Sometime in the late 2000s, the Landmaster was van ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Damnation Alley (film)
''Damnation Alley'' is a 1977 post-apocalyptic film directed by Jack Smight, loosely based on the 1969 novel of the same name by Roger Zelazny. The original music score was composed by Jerry Goldsmith, and the cinematography was by Harry Stradling Jr. Plot First Lieutenant Jake Tanner (Jan-Michael Vincent) shares ICBM silo duty at a US Air Force missile base in the Californian desert with senior officer Major Eugene "Sam" Denton (George Peppard). While signing in for their work shift in the underground base, Denton notifies Tanner he is requesting that command reassign him, since he feels Tanner is not a suitable team member for their two-man crew. While passing through base security checks, Denton and Tanner talk with Sergeant Tom Keegan (Paul Winfield). While Denton and Tanner are running procedure drills, the US detects incoming nuclear missiles from the Soviet Union. After confirmation that an actual attack is in-progress, Tanner and Denton launch part of the retalia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stairclimber
A stairclimber is a type of trolley fitted with rotating wheels or tracks so that it can be pushed or pulled up or down steps or a stairway. Stairclimbers can be manual or battery-powered, and are commonly found in wheel, track, push arm or walker variants. Powered electric stair climbers are available in many variants, both in manufacture and mechanical operation, with the most common being push arm and walker variants due to size, speed and mobility. Tracked versions offer the greatest S.W.L (safe working limit) with regards to the load being moved, whilst push arm and walker variants offer greater speed and ease of operation. Manual Stairclimber wheels Manual stairclimber wheels can be fitted to hand trucks (sack trucks) and as the name implies, are designed to aid the moving of goods up or down stairs. This type of stairclimber relies on a wheel configuration known as tri-star, three wheels set into a triangle configuration replacing the standard wheel on either side. Stair ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Inventions ...
The following articles cover the timeline of United States inventions: *Timeline of United States inventions (before 1890), before the turn of the century * Timeline of United States inventions (1890–1945), before World War II *Timeline of United States inventions (1946–1991), for the post-war era *Timeline of United States inventions (after 1991), after the Fall of the Soviet Union {{DEFAULTSORT:Timeline of United States Inventions United States inventions United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
