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The Pratt & Whitney J58 (company designation JT11D-20) is an American jet engine that powered the Lockheed A-12, and subsequently the YF-12 and the SR-71 aircraft. It was an afterburning turbojet engine with a unique compressor bleed to the afterburner that gave increased thrust at high speeds.
The ramjet Gorgon IVs, made by Glenn Martin, were tested in 1948 and 1949 at Naval Air Station Point Mugu. The ramjet was designed at the University of Southern California and manufactured by the Marquardt Aircraft Company. The engine was 2.1 metres (7 ft) long and 510 millimetres (20 in) in diameter and was positioned below the missile.
The air-breathing monster behind the powerful SR-71 is a Pratt & Whitney J58 turbojet engine, which maxes out at speeds around Mach 3. In Hermeus’s hypersonic design, a ramjet, which can only ...
The Lockheed SR-71 "Blackbird" is a retired long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft developed and manufactured by the American aerospace company Lockheed Corporation. [N 1] Its nicknames include "Blackbird" and "Habu". [1] The SR-71 was developed in the 1960s as a black project by Lockheed's Skunk Works division.
22 December 1964: First flight of the SR-71 with Lockheed test pilot Bob Gilliland at AF Plant #42. First mated flight of the MD-21 with Lockheed test pilot Bill Park at Groom Lake. 28 December 1966: Decision to terminate A-12 program by June 1968. 31 May 1967: A-12s conduct Black Shield operations out of Kadena; 3 November 1967: A-12 and SR-71 ...
Nord 1500 Griffon II, which was powered by a turbojet-ramjet combination, a precursor to later turborocket designs. The air turborocket is a form of combined-cycle jet engine . The basic layout includes a gas generator , which produces high pressure gas, that drives a turbine/compressor assembly which compresses atmospheric air into a ...
In December 2014, NASA awarded Lockheed Martin a contract to study the feasibility of building the SR-72's propulsion system using existing turbine engine technologies, The $892,292 (~$1.13 million in 2023) contract funded a design study to determine the viability of a TBCC propulsion system by combining one of several current turbine engines, with a very low Mach ignition Dual Mode Ramjet (DMRJ).
In this case a biconic cone is required with two angles ( the Bristol Thor ramjet has 24 and 31 degrees for a design speed of Mach 2.5). [5] For higher speeds a more smoothly contoured transition between cone angles may be used in what is known as an isentropic spike (Marquardt RJ43 ramjet). [6]