Nord 1500 Griffon | |
---|---|
General information | |
Type | Experimental interceptor |
National origin | France |
Manufacturer | Nord Aviation |
Number built | 2 |
History | |
First flight | 20 September 1955 |
Retired | 1961 |
The Nord 1500 Griffon is an experimental ramjet-powered interceptor aircraft designed and built by French state-owned aircraft manufacturer Nord Aviation. The Griffon was developed to become a Mach 2 follow on to the supersonic Nord Gerfaut research aircraft. Development of the aircraft began in earnest after the receipt of a letter of intent in 1953 for a pair of unarmed research aircraft. The design featured an innovative dual propulsion turbojet-ramjet configuration; the former being used to takeoff and attain sufficient speed to start the latter.
The first prototype, named Griffon I, made its maiden flight in 1955 and eventually reached a speed of Mach 1.3. Because it lacked the ramjet engine, it was mostly used for exploring the aircraft's aerodynamic properties and its systems. Its flight testing was terminated shortly after the ramjet-equipped Griffon II made its first flight two years later. This aircraft attained a maximum speed of Mach 2.19 and set a world record for a small closed course in 1959. According to the Fédération Aéronautique Internationale, the aircraft held the flight airspeed record from 5 to 31 October of 1959, with a speed of 1,441.6 mph (2,320 km/h) attributed to Maj. André Turcat. It was last flown in 1961 and currently resides in the Musée de l'air et de l'espace outside Paris, France.
The Nord 1500 Griffon originated from a state-sponsored study into delta and swept wings. To provide data for these studies Arsenal de l'Aéronautique (SFECMAS's nationalised predecessor) built a wooden glider, the Arsenal 1301 , that could be fitted with both delta and swept wings and with and without canards. [1] Towed to the release point by SNCAC Martinet, Douglas DC-3 or SNCASE Languedoc transport aircraft, the glider provided valuable data for the design of the Gerfaut. [2]
To utilise this data SFECMAS's chief designer, Jean Galtier, initiated the 1400, 1500 and 1910 interceptor projects with delta wings and different types of propulsion systems. The 1400 developed into the Nord Gerfaut series, the 1500 became the Griffon, while the 1910, ambitiously specified with two large ramjet engines, was never pursued. Galtier envisioned the Griffon as the Mach 2 successor to the supersonic Gerfaut. By this time Arsenal had been privatised as SFECMAS - Société Française d'Etude et de Construction de Matériel Aéronautiques Spéciaux. Powered by a large ramjet with turbojet sustainer, the Griffon was renamed from the SFECMAS 1500 Guépard (Cheetah) after SFECMAS was merged with SNCAN to form Nord Aviation. [3] [4]
On 24 August 1953, a pair of prototypes were ordered, although the final contract (No. 2003/55) would not be issued until 1955. Although intended by Nord to eventually fulfil a requirement for a light interceptor capable of using grass airfields, these two aircraft were ordered without any military equipment installed, being intended for research purposes only. [5]
Much like he did with the Gerfaut, Gaultier opted for a straight-through air duct to keep the air entering the engines as calm as possible and positioned the single-seat cockpit immediately above the semi-circular ventral air intake. The large tubular fuselage supported the same delta wing as used on the Gerfaut and the swept vertical stabilizer with rudder. The forward fuselage had small triangular canards positioned at either side of this cockpit to counteract the center of pressure of the delta wing's tendency to depress the nose as the aircraft approached transonic speeds. The aircraft was fitted with a tricycle undercarriage that retracted into the wings and the underside of the air intake. [6]
A key innovation of the Griffon was its dual-propulsion arrangement, which incorporated a turbojet-ramjet powerplant. [7] The turbojet would enable the aircraft to perform unassisted takeoffs (ramjets cannot produce thrust at zero airspeed, and thus cannot move an aircraft from a standstill) while the ramjet would provide additional thrust once the aircraft had attained an airspeed in excess of 1,000 km/h (600 mph). To reduce risks in using the turbo-ramjet powerplant, the first Griffon (Nord 1500-01 Griffon I) was built with only the afterburning 37.3- kilonewton (8,400 lbf ) SNECMA Atar 101G21 turbojet engine installed with the ramjet to be added at a later date. [8]
The Griffon I made its maiden flight on 20 September 1955, piloted by André Turcat. Flight testing quickly proved the aircraft to be underpowered, a determination that was compounded by the cancellation of plans to install the planned ramjet propulsion system. Despite this reported lack of power, the Griffon I still managed to attain a maximum speed of Mach 1.15 on its first supersonic flight on 11 January 1956. At some point during its life the air intake was enlarged, probably when the more powerful Atar 101E engine was installed and before the aircraft attained its maximum speed of Mach 1.3 at an altitude of 8,560 m (28,080 ft). Although the initial flight testing showed that engine performance above 9,144 m (30,000 ft) suffered, the aircraft's handling qualities were excellent. Its nose gear collapsed on 19 June when Turcat was taxiing across a grass field and the aircraft did not fly again until 26 July. The Griffon I was largely similar to the later ramjet-equipped Griffon II; amongst the few visible differences between the two aircraft were the smaller intake and the two-position exhaust nozzle used only on the Griffon I. It was retired on 16 April 1957. [8]
The Griffon II was fitted with the combination of an Atar 101E-3 turbojet and Nord ramjet. To accommodate the 1.5-metre (4 ft 11 in) diameter of the latter, the aft fuselage was lengthened and widened and its greater requirement for air meant that the ventral air intake had to be enlarged. The aircraft made its first flight on 23 January 1957 and its first supersonic flight occurred on 6 April. Performance was disappointing as it failed to exceed the Mach 1.3 of the Griffon I as the ramjet was still not receiving enough air to fully power it. The Griffon II subsequently had the intake enlarged yet again and reached Mach 1.85 on its first test flight afterwards. [9] The Griffon II set a speed record of 2,320 kilometres per hour (1,440 mph) on 5 October 1959. [10] It attained a peak speed of Mach 2.19 at 15,240 m (50,000 ft) while being piloted by Turcat on 13 October. Turcat had earlier broken the world record for the 100 km (62 mi) closed-circuit course by over 400 km/h (250 mph) with a speed of 1,643 km/h (1,021 mph) on 25 February, an achievement for which he was honored with the Harmon Trophy. The United States Air Force (USAF) contributed some money for the flight testing until 1960. No flights were made at all between February and July of that year and the Griffon II made its last flight on 5 June 1961. [11]
The flight-test program had revealed several technical difficulties were present in the aircraft, including concerns regarding kinetically-generated heat. One particular area of concern was the ramjet exhaust temperature which frequently damaged the tailpipe, another was the skin temperature of the airframe's Duralumin-alloy skin. Flight tests also focused on trying to control the ramjet, which could not be throttled up or down, just on or off, via adjusting the fuel/air ratio. Pilots reported that the Griffon II's flight characteristics were excellent at all speeds: the ramjet could be ignited across a very wide band of speeds and its air intake was insensitive to angle of attack issues. Furthermore its ability to maintain acceleration in a turn was instrumental to its success in the closed-circuit record performance. [12]
The Nord 1500 Griffon II is presently on display in the Musée de l'air et de l'espace, at Le Bourget, near Paris. [15]
Data from X-Planes of Europe: Secret Research Aircraft From the Golden Age 1946–1974; [16] Concept Aircraft: Prototypes, X-Planes and Experimental Aircraft; [17] Les oubliés du Salon de l'Aeronautique (5): les experimentaux [10]
General characteristics
Performance
Related development
Aircraft of comparable role, configuration, and era
A ramjet is a form of airbreathing jet engine that requires forward motion of the engine to provide air for combustion. Ramjets work most efficiently at supersonic speeds around Mach 3 and can operate up to Mach 6.
The Republic XF-103 was an American project to develop a powerful missile-armed interceptor aircraft capable of destroying Soviet bombers while flying at speeds as high as Mach 3. Despite a prolonged development, it never progressed past the mockup stage.
The Bréguet Br 960 Vultur was a prototype two-seat carrier-based attack and anti-submarine aircraft (ASW) built for the French Navy during the early 1950s. Meeting contradictory endurance and speed requirements, it was designed as a "mixed-power" aircraft with a turboprop engine in the front and a turbojet in the rear. Only two examples were built, but the second aircraft was rebuilt as the prototype of the Bréguet 1050 Alizé ASW aircraft after the Navy dropped the idea of a turboprop attack aircraft in the mid-1950s.
Major André Édouard Turcat was a French Air Force pilot and test pilot celebrated for flying the first prototype of Concorde for its maiden flight.
The Snecma Atar is a French axial-flow turbojet engine built by Snecma. It was derived from the German World War II BMW 018 design, and developed by ex-BMW engineers through a progression of more powerful models. The name is derived from its original design group, Atelier technique aéronautique de Rickenbach near Lindau within the French Occupation Zone of Germany. The Atar powered many of the French post-war jet aircraft, including the Vautour, Étendard and Super Étendard, Super Mystère and several models of the Mirage.
The Dassault MD.452 Mystère is a 1950s French fighter-bomber. It was a straightforward development of the successful Dassault Ouragan
The SNCAC NC 1080 was a French jet-engined interceptor developed in the late 1940s by SNCAC for use aboard aircraft carriers. It was intended to compete for an Aéronavale contract and first flew in 1949. The aircraft used an innovative system of flight control surfaces that proved to be a failure during flight testing and had to be modified before it could fly again. Its development was troubled by other design flaws and the company's merger with SNCAN that same year. Further development was cancelled after a fatal crash destroyed the sole prototype in 1950.
The Leduc 0.10 is a research aircraft built in France, one of the world's first aircraft to fly powered solely by a ramjet.
The SNECMA C.450 Coléoptère was a tail-sitting vertical take-off and landing (VTOL) aircraft designed by the French company SNECMA and manufactured by Nord Aviation. While work on the aircraft proceeded to the test flying phase, the project never progressed beyond experimental purposes.
The Arsenal VG 70 was a single-seat monoplane research aircraft flown in France shortly after World War II to assist in the development of high-speed jet fighters. Lacking an indigenous turbojet engine, the aircraft was fitted with a German Junkers Jumo 004. Unlike most jet-powered aircraft of the period, the swept wing was wooden as was the tail structure. The under-powered VG 70 made its maiden flight in 1948, but only flew five times before the program was terminated the following year.
The Arsenal VG 90 was a French carrier-based jet-engined interceptor developed in the late 1940s. It was intended to compete for an Aéronavale contract and first flew in 1949. It set a speed record for a French aircraft the following year, but both of the completed prototypes were destroyed in fatal crashes and the program was cancelled in 1952 before the third prototype was finished. The Aéronavale contract was eventually awarded to a license-built British aircraft. The remains of the last VG 90 were scrapped in 1978.
The Nord Gerfaut (Gyrfalcon) was a French delta-wing experimental research aircraft. It was the first European aircraft to exceed Mach 1 in level flight without the use of an afterburner. A pair of aircraft were built for the primary purpose of investigating the transonic regime. The Gerfaut I conducted its maiden flight in 1954; it was followed by the improved Gerfaut II two years later. Both aircraft were flown for several years for experimental purposes, being significantly upgraded over time. During the course of these test flights, the second prototype establishment multiple time-to-altitude world records. In the late 1950s, the type was used to flight-test various aerial missiles. Both aircraft performed their final flights in 1959; they were subsequently used as targets at the Military Test Range at Cazaux.
The Leduc 0.21 was a research aircraft built in France in 1953 to refine the practicalities of ramjet propulsion. Initially proposed as the 0.20, it was essentially similar to its predecessor, the Leduc 0.10, but scaled up by around 30%, with tip tanks added to the wings. It was not capable of take-off under its own power, and had to be carried aloft and released.
The Leduc 022 was the prototype of a mixed-power French interceptor built in the mid-1950s. Designer René Leduc had been developing ramjet-powered aircraft since before World War II and had flown a series of experimental aircraft, the Leduc 0.10 and Leduc 0.21, throughout the 1950s before he was awarded a contract for two examples of a short-range supersonic interceptor armed with two air-to-air missiles (AAMs).
The SNCASE S.E.5000 Baroudeur was a French single-engined lightweight fighter designed by SNCASE (Sud-Est) and evaluated in the NATO NBMR-1 "Light Weight Strike Fighter" competition. An unusual design without a conventional landing gear, it used a wheeled trolley for take-off and three retractable skids to land. The Baroudeur did not enter production.
The Nord 2200 was a French carrier-based, jet-engined interceptor developed in the late 1940s. It was intended to compete for an Aéronavale contract, but was not selected for production after a 1950 accident badly damaged the sole prototype. It was repaired and resumed flight testing the following year, which including evaluating rocket-assisted take offs. After the aircraft made its last flight in 1954, it was used as a gunnery target. Much of the airframe was recovered in the 1980s, but its current disposition is uncertain.
The SNECMA ATAR 101 is a French axial-flow turbojet engine built by SNECMA. It was derived from engines and design work carried out at BMW in Germany during World War II, and extensively developed though a progression of more powerful models. The name is derived from its original design group, Atelier Technique Aéronautique de Rickenbach employing Hermann Östrich and many of the wartime BMW gas turbine design group as well as other German engine design teams. The ATAR 101 powered many of the French post-war jet aircraft, including the Vautour II, Étendard IV, Super Mystère B2, and the Mirage III-001, prototype of the Mirage III series.
The SNCASO SO.9000 Trident is a French jet and rocket powered interceptor aircraft built by aircraft manufacturer SNCASO during the 1950s. As part of a wider effort to re-build French military power during the late 1940s and to furnish France with advanced, new domestically produced designs, a request for a supersonic-capable point-defence interceptor aircraft to equip the French Air Force was issued to SNCASO. In response, the firm designed the mixed-propulsion Trident, powered by a single SEPR rocket engine, which was augmented by wingtip-mounted turbojet engines, and the Air Force ordered two prototypes.
The Nord Aviation CT20 was a French turbojet-powered radio-controlled target drone introduced in 1957. Developed from the Arsenal / S.F.E.C.M.A.S. T.5.510, the CT.20 was built by Nord Aviation and powered by a Turbomeca Marboré II engine, providing a top speed of 900 km/h and a flying time of 55 to 60 minutes. It has been noted for its similarity to the Ryan Firebee. The unmanned drone was used in the development of air-to-air missiles following the Second World War.
The Sud-Ouest SO.6020 Espadon (Swordfish) was a French post-war prototype interceptor designed and built by SNCASO during the late 1940s. The French Air Force judged the design a failure despite some records being set and cancelled plans to put it into service in 1951. Only four aircraft were built and they were later modified to serve as testbeds for the mixed rocket and turbojet-powered SNCASO SO.9000 Trident program. Only one badly damaged aircraft survives.