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    Nord 1500 Griffon: The French Interceptor’s Daring Venture into Uncharted Territory

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    Nord 1500 Griffon II, Musee de l’Air et de l’Espace, Le Bourget, Paris.” by Roly-sisaphus is licensed under CC BY-SA 2.0

    In the annals of aviation history, the Nord 1500 Griffon stands out not just for its groundbreaking design, but for the ambitious attempt to push the boundaries of speed and engineering during the mid-20th century.

    Nord 1500 Griffon II” by Falcon_33 is licensed under CC BY-SA 2.0

    The French experimental interceptor plane, which first took to the skies in 1955, promised a new era of defense capabilities. Yet, despite its early achievements, the program was ultimately grounded by the very innovations that made it remarkable.

    Nord 1500-02 Griffon II in Paris” by J.Comstedt is licensed under CC BY-NC-ND 2.0

    At the heart of the Griffon’s design was its hybrid propulsion system—a combination of a turbojet and a ramjet engine.

    The marriage of these two systems was envisioned to propel the Griffon past the coveted Mach 2 threshold, a target that, during the 1950s, represented the pinnacle of interceptor performance.

    Nord 1500-02 Griffon II ‘I’” by HawkeyeUK is licensed under CC BY-SA 2.0

    The first prototype, Griffon I, which lacked the ramjet, managed to reach Mach 1.15 in early testing, displaying excellent handling characteristics despite its power limitations.

    The second prototype, Griffon II, featured a dual propulsion turbojet-ramjet configuration, and it was this aircraft that captured the world’s attention.

    The Prototypes Hall at the Musée de l’air et de l’espace, Le Bourget, France” by HawkeyeUK is licensed under CC BY-SA 2.0

    The Griffon II is the only other entry in the Griffon test program, with the main difference being that this example has a ramjet engine installed.

    Nord 1500 Griffon, Maquettexpo 2019.” by Roly-sisaphus is licensed under CC BY-SA 2.0

    It is powered by an Atar 101F series afterburner turbojet engine with a thrust of 7.735 pounds, which is discharged through a new, larger-diameter port under the rear wing.

    Nord Aviation 1500 Griffon II (11728891566)” by Clemens Vasters from Viersen, Germany, Germany is licensed under CC BY 2.0

    An early form of a computer system was also introduced to better regulate the fuel of ramjet engine units. The first flight of this Griffon variant was recorded on January 23, 1957.

    Griffon 2.JPG” by Isabelle + Stéphane Gallay is licensed under CC BY 2.0

    In December of the same year, the aircraft recorded a speed of Mach 1.85 – getting closer and closer to the required Mach 2 speed envelope. In October 1958, the aircraft finally reached Mach 2, but it was soon discovered that the structure of the aircraft limited the maximum speed to Mach 2.1. The aircraft was also shown at the Paris Air Show in 1959.

    Dassault Mirage III E in Berlin Gatow Luftwaffe museum” by aeroman3 is licensed under CC CC0 1.0

    However, the path to these achievements was anything but smooth. The Griffon program faced numerous hurdles, from the high heat sensitivity of the aircraft’s Duralumin skin to the mid-range speed problems with the ramjet engine, which frequently damaged the tailpipe due to excessive exhaust temperatures.  

    Dassault Mirage IIIS ‘J-2332’” by HawkeyeUK is licensed under CC BY-SA 2.0

    simpler and less costly aircraft like the Dassault Mirage III were already delivering high performance .

    Dassault Mirage IIIS” by Aerofossile2012 is licensed under CC BY-NC-SA 2.0

    The final nail in the coffin for the Nord 1500 Griffon came as funding and interest dried up. Griffon II’s last flight occurred on June 5, 1961, marking the end of an ambitious project that had aimed to defend France’s skies at unprecedented speeds.

    Nord 1500 – Griffon II vue rapprochée” by Adrienhumb is licensed under CC BY-SA 4.0

    But all is not lost. The French gained a lot of knowledge from these experiments, and even the United States is paying close attention. The biggest concern was about the exhaust pipe of the ramjet engine, which was so hot that it often damaged the exhaust pipe.

    When it reaches high speeds, the metal skin of the aircraft also becomes damaged. Controlling a ramjet engine is also a challenge, as it cannot throttle up and down.

    Relevant articles:
    The top 10 fastest jets in the world 2024, sciencefocus.com
    Nord 1500 (Griffon) Experimental Ramjet, Military Factory
    Nord 1500 Griffon: The Fighter That Broke All the Rules and Speed Records, The National Interest, Jan 1, 2024
    Nord 1500 Griffon – French Madness?, PlaneHistoria -, Feb 16, 2022

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