This is the “Socièté Française d’Etudes et de Constructions de Materiels Aeronautiques et Spaciaux”.

-When Arsenal ceased to exist as a public company and was privatized in 1953, it was renamed as mentioned above.

-The first thing they did was continuing to develop the ramjets, pulsejets and rockets that were underway. The rest of the engines were slowed down, due to their complexity and because their use was surpassed by the turbines.

“Sfecmas, Ars. 600”

-Sfecmas was a subsidiary of SNCAN, (Socièté National de Construction Aeronautique du Nord).

-In 1955, SNCAN absorbed SFECMAS and in 1958 it became Nord-Aviation.

-The shown Ars 600 ramjet averages 600 mm in diameter and a length of 3,250 mm.

-Its thrust was 500 Kgf at sea level and it advanced at 1,000 Km/hr.

-The Ars 900 model was 900 mm in diameter by 4,125 mm in length and gave 1,140 Kgf of thrust.

-These powers near the ground were significantly reduced when at altitude. At 40,000 feet of altitude (around 12,000 meters) the Ars-900 with a speed of 900 km/hr only gave 285 Kgf.

-The decrease in air density meant that the speed of the vehicle was not reduced, consuming infinitely less fuel. The same as in turbines.

-The ramjets at Sfecmas/Nord-Aviation became known as ST600 or the supersonic ST400. The Griffon I and II were from this brand.

-Due to the coincidence of structure and engine constructions at Nord-Aviation, the 12H engine of Ars. (ex Junkers Jumo 213A) was reconsidered.

-The engine was an inverted 12 V that was liquid-cooled and gave 1620 CV at 2,700 rpm. It was installed on the French Navy plane, the Nord 1402.

“Sfecmas, Ars. 12H”