Marquardt MA-74 | |
---|---|
Type | Ramjet |
National origin | United States |
Manufacturer | Marquardt Corporation |
Major applications | North American MQM-42 |
The Marquardt MA-74 was a ramjet engine built by the Marquardt Corporation for use in supersonic target drones in the 1960s.
A ramjet, sometimes referred to as a flying stovepipe or an athodyd, is a form of airbreathing jet engine that uses the engine's forward motion to compress incoming air without an axial compressor or a centrifugal compressor. Because ramjets cannot produce thrust at zero airspeed, they cannot move an aircraft from a standstill. A ramjet-powered vehicle, therefore, requires an assisted take-off like a rocket assist to accelerate it to a speed where it begins to produce thrust. Ramjets work most efficiently at supersonic speeds around Mach 3. This type of engine can operate up to speeds of Mach 6.
Marquardt Corporation was one of the few aeronautical engineering firms that was dedicated almost solely to the development of the ramjet engine. Marquardt designs were developed through the 1940s into the 1960s, but the ramjet never became a major design and the company turned to other fields in the 1970s. They suffered a particularly bad financial crisis with the ending of the Cold War, and went bankrupt in the 1990s.
A target drone is an unmanned aerial vehicle, generally remote controlled, usually used in the training of anti-aircraft crews.
The MA-74 was developed by Marquardt for use as a powerplant for high-speed target drones; [1] its primary use was in the North American Redhead and Roadrunner. [2] A nacelle-type ramjet, it used a normal shock inlet, and was designed to be mounted on top of the aircraft; fuel was ordinary JP-4. [1]
The MQM-42 was a supersonic target drone developed by North American Aviation. Developed in two subvariants, Redhead and Roadrunner, it was used by the United States Army in the 1960s and 1970s.
A nacelle is a housing, separate from the fuselage, that holds engines, fuel, or equipment on an aircraft. In some cases—for instance in the typical "Farman" type "pusher" aircraft, or the World War II-era P-38 Lightning—an aircraft's cockpit may also be housed in a nacelle, which essentially fills the function of a conventional fuselage. The covering is typically aerodynamically shaped.
JP-4, or JP4 was a jet fuel, specified in 1951 by the U.S. government (MIL-DTL-5624). Its NATO code is F-40. It is also known as avtag.
Data from Haggerty 1966 [1]
Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system. The force applied on a surface in a direction perpendicular or normal to the surface is also called thrust. Force, and thus thrust, is measured using the International System of Units (SI) in newtons, and represents the amount needed to accelerate 1 kilogram of mass at the rate of 1 meter per second per second. In mechanical engineering, force orthogonal to the main load is referred to as thrust.
Thrust-to-weight ratio is a dimensionless ratio of thrust to weight of a rocket, jet engine, propeller engine, or a vehicle propelled by such an engine that indicates the performance of the engine or vehicle.
The BQM-74 Chukar is a series of aerial target drones produced by Northrop. The Chukar has gone through three major revisions, including the initial MQM-74A Chukar I, the MQM-74C Chukar II, and the BQM-74C Chukar III. They are recoverable, remote controlled, subsonic aerial target, capable of speeds up to Mach 0.86 and altitudes from 30 to 40,000 ft.
The Bristol Thor, latterly Bristol Siddeley BS.1009 Thor, was a 16-inch diameter ramjet engine developed by Bristol Aero Engines for the Bristol Bloodhound anti-aircraft missile.
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The Marquardt RJ43-MA were ramjet engines used on the CIM-10 Bomarc missile, the D-21 drone, and the AQM-60. They were engineered and built by the Marquardt Corporation.
The MA-31 was a conversion of the Kh-31 anti-ship missile, developed by the Soviet Union during the 1980s, for use as a target drone by the United States Navy. Although the missile proved successful in this role, political complications resulted in the type being only an interim solution, and only a small number of the missiles were acquired.
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The MQM-107 Streaker is a reusable, turbojet powered, target towing drone primarily used by the United States Army and the United States Air Force for testing and training. The US Army uses the drone for testing various surface-to-air missile systems such as the FIM-92 Stinger and the MIM-104 Patriot. The USAF uses them in practice engagements for their air-to-air missiles like the AIM-9 Sidewinder and the AIM-120 AMRAAM.
The Teledyne CAE J402 is a small turbojet engine. Several variants have been developed to power unmanned air vehicles such as missiles and target drones. Developed in the 1970s for the Harpoon anti-ship missile, the J402 was the first jet engine to be designed as a "wooden round", meaning that the engine had to be able to sit for long periods without maintenance or inspection and work right away.
The Advanced Strategic Air-Launched Missile (ASALM) was a medium-range strategic missile program, developed in the late 1970s for the United States Air Force. Intended for use in both the air-to-surface and anti-AWACS roles, the missile's development reached the stage of propulsion-system tests before being cancelled in 1980.
The Globe KD5G is a pulsejet-powered American target drone produced by Globe Aircraft Corporation that began development in 1949. Due to changing requirements for drone performance, it was only operated by the United States Navy for a short period.
The AQM-127 Supersonic Low-Altitude Target (SLAT) was a target drone developed during the 1980s by Martin Marietta for use by the United States Navy. Derived from Martin Marietta's work on the cancelled ASALM missile, SLAT proved to have severe difficulties in flight testing, and the project was cancelled during 1991.
The XBQM-108A was an experimental VTOL unmanned aerial vehicle developed by the United States Navy during the 1970s. Although the XBQM-108A successfully conducted tethered flight tests, the project was cancelled before any free flights could be conducted.
The Creative Research On Weapons or Crow program was an experimental missile project developed by the United States Navy's Naval Air Missile Test Center during the late 1950s. Intended to evaluate the solid-fueled integral rocket/ramjet (SFIRR) method of propulsion as well as solid-fueled ramjet engines, flight tests were conducted during the early 1960s with mixed success.
The Temco XKDT Teal was an American rocket-propelled, high-performance target drone, built by Temco Aircraft for evaluation by the United States Navy in the late 1950s. Production was not proceeded with following evaluation of the type.
The Nord CT.41 Narwhal was a French target drone, designed and built by Nord Aviation during the late 1950s for the purpose of providing training in the interception of supersonic bomber aircraft.
The Aerojet SD-2 Overseer was an unmanned aerial vehicle developed by Aerojet General and Rheem Manufacturing Co. in the late 1950s for use by the United States Army. Built in limited numbers, it never saw operational service.
The PTV-N-2 Gorgon IV was a ramjet-powered missile developed by the Glenn L. Martin Company for the United States Navy. Originally intended as an air-to-surface weapon, it materialized as a propulsion test vehicle, and between 1947 and 1950 was used for test purposes and, as the KDM Plover, as a target drone.
An Amazon Standard Identification Number (ASIN) is a 10-character alphanumeric unique identifier assigned by Amazon.com and its partners for product identification within the Amazon organization.
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