Development of a 8-tonne reconnaissance amphibious tracked vehicle (ERAC) was launched in 1960.
The use of a fin-stabilized shaped charge projectile as main anti-tank round was deemed obvious given the performance achieved with the 90 mm shell.
The project consists of a D 739 gun firing a 105 mm projectile with a steel body designed to be fired under higher pressure (2100 kg/cm²) with a muzzle velocity of 850 m/s.
The static firing trials in 1962 and the ERAC prototype the following year fall short of expectations ; the accuracy is barely acceptable and the armor penetration is mediocre compared to the caliber.
Meanwhile, the ERAC project is cancelled and its successor, the ECA (Engin de Combat Amphibie : amphibious fighting machine) didn't have any more luck.
The AMX-10 RC also used a fin-stabilized shaped charge projectile but with a superior ballistic performance (1100 m/s).
- MAREST, M, TAUZIN, M, COMHART T9 ; L'armement de gros calibre, Centre des hautes études de l’armement Division Histoire, Paris, 2008.