CN-105-F1 (105 mm)

Description

The 105 mm Modèle F1 (or CN-105-F1) is a 105 mm rifled tank gun used by the AMX-30 and its variants. The gun is made from steel with a magnesium thermal sleeve to protect against damage such as bending. One of the unique features of the gun was the ability to shoot the Obus à Charge Creuse de 105 mm Modèle F1 or OCC for short.

Vehicles equipped with this weapon

• AMX-30
• AMX-30 (1972)
• AMX-30B2
• AMX-30B2 BRENUS
• AMX-30 Super

General info

The Modèle F1 is fitted with a semi-automatic vertical sliding wedge breechblock but it is lacking a muzzle brake. As opposed to the British L7A1, the F1 cannon uses a compressed air scavenging system instead of a bore evacuator. The recoil mechanism uses two symmetrically opposed hydraulic brake cylinders with a single hydropneumatic recuperator cylinder.

Available ammunition

• OCC 105 F1

The OCC projectile is the default HEAT round the user starts out with. It consists of two parts, the outer shell with a suspended inner shell connected by ball bearings. This allowed the HEAT round to be spin stabilized unlike other modern HEAT rounds which are fin stabilized. It weighs 10.95 kg and the warhead contains 780 g of RDX. Its speed is 1,000 m/s with the penetration force of up to 400 mm.

• OE 105 F1 Mle.60

The OE 105 projectile is a default HE round the user stats out with. It consists of a steel body with an explosive filling of the TNT type. There is a sensitive impact fuse at the end of the projectile which detonates upon contact with any surface. The projectile weighs 12.1 kg and the explosive mass is 2 kg worth of TNT. Its speed is 700 m/s with the penetration force of 25 mm.

• OFPH 105 F1

The OFPH 105 projectile is a smoke round that, upon impact, creates a smoke screen for 5 seconds. The smoke screen itself lasts 25 seconds and has 20 m radius. It weighs 11.4 kg and has a muzzle velocity of 700 m/s.

• OFL 105 F1

The OFL 105 projectile is an APFSDS round that relies on kinetic energy and spalling to damage enemy vehicles. It weighs 3.45 kg but drops to 1.6 kg in-flight due to the SABOT discarding. It moves at the speed of 1,525 m/s with the penetration force of up to 361 mm.

Comparison with analogues

Comparable cannons to CN-105-F1
	Name	Year of Creation	Mass	Rounds Per Minute	Rounds	Caliber
▄	Royal Ordnance L7A1	1956	1,282 kg	10 RPM	Shot L28A1 Shell L35	105 mm
▄	Royal Ordnance L7A3	1957	1,287 kg	6 RPM	DM12 DM13 - DM33	105 mm
▄	OTO Melara 105/52	1977	________	7 RPM	M456 - M393A2 M735 - DM33	105 mm
▃	M68	1958	1,128 kg	850 RPM	M728 M456 - M393A2	105 mm

Usage in battles

Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.

Pros and cons

Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.

Pros:

Cons:

History

The 105 mm Modèle F1 first entered service in the year 1966. It was designed at the Établissement central de l'armement terrestre (Central Establishment of Land Armament) in Saint-Cloud and developed by the atelier de Bourges (Bourges Arsenal) towards the end of 1950. A shortened version of the gun was also used on the M-51 'Super Sherman', which was an improved Israeli version of the American M4 Sherman tank.

Its design is based on that of the CN-105-57, used by the AMX-13. The length of the barrel is 5.9 m and its official designation is "Cn 105 Mle 622". It weighs 2,470 kg and it requires 2 crew members to operate efficiently.

The AMX-30 with its spin stabilized HEAT round, was considered as an "ideal round" for its time. The Modèle F1 was also designed to fire the OCC F1 Mle.60 high explosive projectile, but also the SCC F1 training round and the OFUM PH-105 F1 smoke round.

Media

• 

  AMX-30 Super equipped with the CN-105-F1

• 

  AMX-30 (1972) equipped with the CN-105-F1

See also

• Royal Ordnance L7A1 (105 mm) - British 105 mm cannon
• L7A3 (105 mm) - American 105 mm cannon. Identical to the L7A1, the only exception is that it can't load HEAT-FS rounds
• OTO Melara 105/52 (105 mm) - Italian 105 mm cannon
• M68 (105 mm) - Identical to the L7, the only difference is that the cannon issecured to the breech by a tapered pin and interrupted breech threads which allow the barrel to be removed from the tank shield without having to dismantle the mantlet.

External links

• [Wikipedia] 105 mm Modèle F1
• [Kotsch88] Ammunition for the Modèle F1
• [Angelfire] Comparison of tank cannons