rThe primary strike weapon of the Sovee Navy, the ANM-3 missile (and specifically the ANG-3 TR2 variant) is an anti-ship missile designed to provide the primary anti-ship capability of an aircraft carrier’s strike wing.
The missile’s guidance sensors and computers are located in front of the 1000 pound bomb that is the missile’s primary weapon. A ram air turbine on top of the missile provides power for the primary stability autopilot and the four independent control surfaces (elevator, rudder, and two ailerons, of which the rudder is the only one with proportional control, as the others are all solenoid driven), and a rocket motor is usually attached to the bottom to increase operational range.
The missile is launched in “TV GUIDE” mode, and the rocket engine ignites automatically after a half second. In this mode, the primary stability autopilot uses the ailerons on the glide wings to maintain level flight, controlled by a gyroscope embedded in the autopilot. The autopilot also controls the tail elevators to maintain a constant airspeed gauged by the power turbine’s RPM. The bombardier on the launching aircraft can use a switch on the guidance console to set the missile’s rudder right or left to control the horizontal aim of the missile and spin a wheel to set the target airspeed for the missile. Setting the airspeed higher than the ideal glide speed results in a shorter steeper path, and setting the airspeed closer to the ideal glide speed results in a longer shallower path. In this way, the vertical aim of the missile is controlled. The pilot is forced to take the wind into account, as the missile is controlling for airspeed, not ground speed. Additionally, experienced bombardiers will take the movement of the target vessel into account. At any point in the flight (even prior to launch), the missile can be changed to “RAD AUTO” mode. Once this change is made, the missile no longer accepts commands from the launching aircraft (although it does continue to return television images for damage assessment). In this mode, the secondary seek autopilot activates the onboard radar and searches the resulting image for areas of high contrast (the silhouette of a ship). It attempts to keep these areas in the center of the image by manipulating the rudder and airspeed hold, as the bombardier did in the previous mode. (Although, since the missile does not correct for target movement or wind, it follows a non-ideal route.) This mode requires more power than the turbine can generate, and draws from an onboard battery reserve that (in the ANM-3 TR2 model) lasts approximately 60 seconds. Under normal flight conditions, this is usually enough power for 15 kilometers of flight. If the battery is exhausted, the radar and the secondary seek autopilot are deactivated, and the primary stability autopilot holds the wings level at the most recently set airspeed. The bomb is detonated by proximity trigger when it reaches the target or the ocean surface. In case this fails, an independent timer detonates the bomb five minutes after launch to destroy the guidance system.
ANM-3X2 Experimental prototype weapon, first flight 1947
ANM-3 TR1 First version, entered service 1950. Retired 1957.
SNM-3 TR1 Surface-launched variant for coastal defense with large two-stage rocket booster. Entered service 1953.
ANM-3 TR2 Second version. Improved radar, battery, and variable-frequency control link. Entered service 1955.
ANC-3 R1 Cruise missile using the same guidance computer. First stage of engagement is controled by internal navigation specified prior to launch, and uses an integrated tubojet engine to achieve much greater range. Signifignaly higher weight means this version is only carried by bomber aircraft.
SNM-3 TR2 Surface-launched variant for coastal defense with large two-stage rocket booster. Entered service 1958.
ANM-3 TR3 Third version. Battery duration extended to 120 seconds. Post-radar autopilot improved to reference onboard gyroscope to hold heading. Improved rocket engine enclosed in streamlined nacelle. Entered service 1960.