Ship self-defense systems are installed on all types of surface ships and submarines. RIM-101 is a very poorly attested project of the United States Navy to develop a surface-to-air missile (SAM) for the defense of naval vessels. Developed during the early 1970s, the project was cancelled before detailed design work. The project, possibly derived from the RIM-7 Sea Sparrow, received the designation ZRIM-101A in 1973. The RIM-101 was planned as a tube-launched weapon, with a small ejector charge cold-launching the missile from the launching tube prior to ignition of the solid-fueled rocket sustainer based on the FIM-43 Redeye SAM. Midcourse guidance of the new missile was planned to be of the semi-active radar homing type, using an I-band radar system. Terminal guidance would be achieved by infrared seeker.
The RIM-101 project was cancelled early in the design-and-development stage, before any hardware had been built. Some have speculated that the RIM-101 was intended to be an advanced development of the RIM-7 Sea Sparrow missile, then in US Navy service as the Basic Point Defense Missile System. While the RIM-7 does not match the description of RIM-101, an advanced development of the RIM-7E would fit the timeframe and description, with RIM-7F developed following the cancellation of RIM-101.
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