Rocketdyne: История американской ракетной компании

American rocket engine design and production company

Rocketdyne was an American rocket engine design and production company headquartered in Canoga Park, in the western San Fernando Valley of suburban Los Angeles, in southern California. The Rocketdyne Division was founded by North American Aviation (NAA) in 1955, and was later part of Rockwell International (1967–1996) and Boeing (1996–2005). In 2005, the Rocketdyne Division was sold to United Technologies Corporation, becoming Pratt & Whitney Rocketdyne as part of Pratt & Whitney. In 2013, Pratt & Whitney Rocketdyne was sold to GenCorp, which merged it with Aerojet to form Aerojet Rocketdyne.

After World War II, North American Aviation (NAA) was contracted by the Defense Department to study the German V 2 missile and adapt its engine to Society of Automotive Engineers (SAE) measurements and U. S. construction details. NAA also used the same general concept of separate burner/injectors from the V 2 engine design to build a much larger engine for the Navaho missile project (1946–1958). This work was considered unimportant in the 1940s and funded at a very low level, but the start of the Korean War in 1950 changed priorities. NAA had begun to use the Santa Susana Field Laboratory (SSFL) high in the Simi Hills around 1947 for the Navaho's rocket engine testing. At that time the site was much further away from major populated areas than the early test sites NAA had been using within Los Angeles. Navaho ran into continual difficulties and was canceled in 1958 when the Chrysler Corporation Missile Division's Redstone missile design (essentially an improved V 2) had caught up in development. However the Rocketdyne engine, known as the A 5 or NAA75 110, proved to be considerably more reliable than the one developed for Redstone, so the missile was redesigned with the A 5 even though the resulting missile had much shorter range. As the missile entered production, NAA spun off Rocketdyne in 1955 as a separate division, and built its new plant in the then small Los Angeles suburb of Canoga Park, in the San Fernando Valley near and below its Santa Susana Field Laboratory. In 1967, NAA, with its Rocketdyne and Atomics International divisions, merged with the Rockwell Corporation to form North American Rockwell, becoming in 1973 Rockwell International.

Rocketdyne's next major development was its first all new design, the S 3D, which had been developed in parallel to the V 2 derived A series. The S 3 was used on the Army's Jupiter missile design, essentially a development of the Redstone, and was later selected for the competitor Air Force Thor missile. An even larger design, the LR89/LR105, was used on the Atlas missile. The Thor had a short military career, but it was used as a satellite launcher through the 1950s and 60s in a number of different versions. One, Thor Delta, became the baseline for the current Delta series of space launchers, although since the late 1960s the Delta has had almost nothing in common with the Thor. Although the original S 3 engine was used on some Delta versions, most use its updated RS 27 design, originally developed as a single engine to replace the three engine cluster on the Atlas. The Atlas also had a short military career as a deterrent weapon, but the Atlas rocket family descended from it became an important orbital launcher for many decades, both for the Project Mercury crewed spacecraft, and in the much employed Atlas Agena and Atlas Centaur rockets. The Atlas V is still in manufacture and use.

Rocketdyne also became the major supplier for NASA's development efforts, supplying all of the major engines for the Saturn rocket, and potentially, the huge Nova rocket designs. Rocketdyne's H 1 engine was used by the Saturn I booster main stage. Five F 1 engines powered the Saturn V's S IC first stage, while five J 2 engines powered its S II second stage, and one J 2 the S IVB third stages. By 1965, Rocketdyne built the vast majority of United States rocket engines, excepting those of the Titan rocket (built by Aerojet), and its payroll had grown to 65,000. This sort of growth appeared to be destined to continue in the 1970s when Rocketdyne won the contract for the RS 25 Space Shuttle Main Engine (SSME), but the rapid downturn in other military and civilian contracts led to downsizing of the company. North American Aviation, largely a spacecraft manufacturer, and also tied almost entirely to the Space Shuttle, merged with the Rockwell Corporation in 1966 to form the North American Rockwell company, which became Rockwell International in 1973, with Rocketdyne as a major division.

During continued downsizing in the 1980s and 1990s, Rockwell International shed several parts of the former North American Rockwell corporation. The aerospace entities of Rockwell International, including the former NAA and Rocketdyne, were sold to Boeing in 1996. Rocketdyne became part of Boeing's Defense division. In February 2005, Boeing reached an agreement to sell what was by then referred to as "Rocketdyne Propulsion & Power" to Pratt & Whitney of United Technologies Corporation. The transaction was completed on August 2, 2005. Boeing retained ownership of Rocketdyne's Santa Susana Field Lab. GenCorp purchased Pratt & Whitney Rocketdyne in 2013 from United Technologies Corporation, and merged it with Aerojet to form Aerojet Rocketdyne. In the Boeing sale to Pratt & Whitney, the Power Systems division of Rocketdyne was transferred to Hamilton Sundstrand, another subsidiary of United Technologies Corporation.