Design
The Mk F3 is essentially a modified AMX-13 light tank chassis with the rear idler removed and the hull modified to accept a 155 mm cannon and its recoil, elevating and traversing mechanisms, including two rear spades which reversed into the ground to give added stability when firing. The 155 mm gun was designed by the Atelier de Construction de Tarbes (ATS), and the chassis by the Atelier de Construction Roanne (ARE). Integration of the gun with the chassis and all firing trials were undertaken by the Etablissement d'Etudes et de Fabrications d'Armement de Bourges (EFAB). Because the ARE was tooling up for production of the AMX-30 main battle tank, production of the whole AMX-13 tank family, including the F3 155 mm self-propelled gun, was transferred to Mécanique Creusot-Loire.
The F3 fired the standard 155 mm high-explosive projectile, and is also capable of firing the smoke, illumination and rocket-assisted rounds. The effective range is 20,050 m with 43.75 kg HE rounds.
The hull of the Mk F3 is of all-welded steel armour measuring 10 to 20 mm, providing the two occupants with protection from small arms fire and shell splinters. The layout is conventional, with the driver's compartment at the front on the left, engine compartment to the right and the 155 mm gun above at the rear. A splashboard is mounted at the front of the hull to stop water from rushing up the glacis plate when the vehicle is fording streams. A replacement road wheel is often carried on the glacis plate. The driver has a single-piece hatch that opens to the left, and is provided with three daylight periscopes, the centre one of which is replaceable by an image intensification (or thermal) periscope for night driving. The commander is seated behind the driver and has a two-piece hatch that opens to either side. The commander is also provided with three daylight periscopes.
The torsion bar suspension consists of five single rubber-tyred road wheels with the drive sprocket at the front and the fifth roadwheel acting as the idler. There are three track-return rollers. The first and last road wheel stations have hydraulic shock-absorbers. The steel tracks can be fitted with rubber pads if required. Stowage containers are provided along each side of the upper part of the hull. Standard equipment includes a loudspeaker and a cable reel with 400 m of cable.
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