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 an aeronautical engineering firm started in 1944 as ‘’’Marquardt Aircraft Company’’’ and initially dedicated almost entirely to the development of the ramjet engine. Marquardt designs were developed from the mid-1940s into the early 1960s, but as the ramjet disappeared from military usage, the company turned to other fields.
The Boeing AGM-69 SRAM was a nuclear air-to-surface missile. It had a range of up to 50 nautical miles, and was intended to allow US Air Force strategic bombers to penetrate Soviet airspace by neutralizing surface-to-air missile defenses.
The AGM-131 SRAM II was a nuclear air-to-surface missile intended as a replacement for the AGM-69 SRAM. The solid-fueled missile was to be dropped from a B-1B Lancer, carry the W89 warhead and have a range of 400km. However, the program was canceled by President George H.W. Bush for geopolitical reasons just as the first flight-test missile was delivered.
The North American SM-64 Navaho was a supersonic intercontinental cruise missile project built by North American Aviation (NAA). The final design was capable of delivering a nuclear weapon to the USSR from bases in the US, while cruising at Mach 3 at 60,000 feet (18,000 m) altitude. The missile is named after the Navajo Nation.
The Fairchild SM-73 was a sub-sonic, jet-powered, ground-launched decoy cruise missile.
The Gorgon missile family was a series of experimental air-to-air, air-to-surface, and surface-to-surface missiles developed by the United States Navy's Naval Aircraft Modification Unit between 1943 and 1953. The immaturity of the technology involved meant that none of the Gorgon missiles achieved operational service, however they were extensively used in the development of guided missile controls and guidance technologies.
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.
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.
The High Virgo, also known as Weapons System 199C (WS-199C), was a prototype air-launched ballistic missile (ALBM) jointly developed by Lockheed and the Convair division of General Dynamics during the late 1950s. The missile proved moderately successful and aided in the development of the later GAM-87 Skybolt ALBM. It was also used in early tests of anti-satellite weapons.
The Wagtail missile, also known as "Wag Tail", was a short-range nuclear missile developed in the late 1950s by Minneapolis-Honeywell under a contract awarded by the United States Air Force. Intended for use as an auxiliary weapon by bomber aircraft, the missile was successfully test fired in 1958, but the program was cancelled in the early 1960s.
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 RIM-113 Shipboard Intermediate Range Combat System, or SIRCS, was an advanced surface-to-air missile proposed by the United States Navy in the 1970s. The project failed to be approved for funding and was cancelled in 1979.
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 AGR-14 ZAP was an air-to-surface unguided rocket developed by the United States Navy in the late 1960s. Intended for use in the suppression of enemy air defenses role, the rocket reached the flight-testing stage before being cancelled.
The AAM-A-1 Firebird was an early American air-to-air missile, developed by the Ryan Aeronautical Company. The first air-to-air missile program developed for the United States Air Force, the Firebird was extensively tested in the late 1940s; although it proved successful in testing, it was soon obsolete due to the rapid advances in aircraft and missile technology at the time and did not enter production.
The ASM-N-5 Gorgon V was an unpowered air-to-surface missile, developed by the Glenn L. Martin Company during the early 1950s for use by the United States Navy as a chemical weapon delivery vehicle. Developed from the earlier PTV-N-2 Gorgon IV test vehicle, the program was cancelled without any Gorgon Vs seeing service.
The AAM-N-4 Oriole was an early American air-to-air missile, developed by the Glenn L. Martin Company for the United States Navy. Designed for launch from carrier-based aircraft, the missile programme was cancelled before flight testing began, and the missiles produced were utilized as test vehicles.
The PTV-N-2 Gorgon IV was a subsonic 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.
Solid Fuel Ducted Ramjet (SFDR) is a missile propulsion system currently being developed by the Defence Research and Development Organisation of India. The project aims to develop critical technologies required in the propulsion systems of future Indian long range air-to-air missiles.
