M20 SLBM
Encyclopedia
The M20 was a French Submarine Launched Ballistic Missile (SLBM) deployed on the nuclear Redoutable class submarines. It was withdrawn from service by 1991.
The M-1 version went into service in 1971 and was phased out in favour of the M-2 in 1974, itself replaced by the M-20 in 1977. The new M-4 missile entered service in 1985 and has replaced the M-20. French nuclear-powered submarines (SNLE: Sous-marin Nucléaire Lanceur d'Engins, "Nuclear Device-Launching Submarine"), are able to carry 16 missiles each. The oldest ship, Redoutable, was not converted to carry the M-4 and was withdrawn from service in 1991. Logistical support for the MSBS fleet is provided by the Île Longue
Naval Base in Brest Bay, where the assembly and storage facilities for maintenance of readiness are located. Three SSBNs are intended to be operational at any one time.
The M-20 system entered service in 1977. There were 100 missiles produced, and the M-20 ceased operational deployment in 1991.
s; the second stage by thrust vector control
through a single fixed nozzle. The first stage propellant weighed 10000 kg and burns for 55 seconds, the second stage propellant weighs 6015 kg and burns for 58 seconds. Guidance was inertial
. The payload was believed to include some penetration aids and the single re-entry vehicle had some hardening against nuclear effects. The TN-60 warhead was reported to be 1.2 MT.
History
The M-20 was the third member of the MSBS (Mer-Sol-Balistique-Stratégique, "sea-ground ballistic strategic") family which comprised a number of submarine-launched, intermediate range missiles. The force constitutes the second leg of the French nuclear deterrent force.The M-1 version went into service in 1971 and was phased out in favour of the M-2 in 1974, itself replaced by the M-20 in 1977. The new M-4 missile entered service in 1985 and has replaced the M-20. French nuclear-powered submarines (SNLE: Sous-marin Nucléaire Lanceur d'Engins, "Nuclear Device-Launching Submarine"), are able to carry 16 missiles each. The oldest ship, Redoutable, was not converted to carry the M-4 and was withdrawn from service in 1991. Logistical support for the MSBS fleet is provided by the Île Longue
Île Longue
Île Longue is a peninsula of the roadstead of Brest. It is the base of the SNLE, the French ballistic missile submarines, and as such one of the most secretive and heavily defended places in France.-Geography:...
Naval Base in Brest Bay, where the assembly and storage facilities for maintenance of readiness are located. Three SSBNs are intended to be operational at any one time.
The M-20 system entered service in 1977. There were 100 missiles produced, and the M-20 ceased operational deployment in 1991.
Technical
The M-20 was a two-stage, solid propellant, Intermediate-Range Ballistic Missile, 10.4 m in length and 1.5 m in diameter. Launch weight was 20000 kg and the missile had a range of 3000 km. Control of the first stage was by four gimballed nozzleNozzle
A nozzle is a device designed to control the direction or characteristics of a fluid flow as it exits an enclosed chamber or pipe via an orifice....
s; the second stage by thrust vector control
Thrust vectoring
Thrust vectoring, also thrust vector control or TVC, is the ability of an aircraft, rocket or other vehicle to manipulate the direction of the thrust from its engine or motor in order to control the attitude or angular velocity of the vehicle....
through a single fixed nozzle. The first stage propellant weighed 10000 kg and burns for 55 seconds, the second stage propellant weighs 6015 kg and burns for 58 seconds. Guidance was inertial
Inertial navigation system
An inertial navigation system is a navigation aid that uses a computer, motion sensors and rotation sensors to continuously calculate via dead reckoning the position, orientation, and velocity of a moving object without the need for external references...
. The payload was believed to include some penetration aids and the single re-entry vehicle had some hardening against nuclear effects. The TN-60 warhead was reported to be 1.2 MT.