LONG RANGE ANTI-SHIP MISSILE
The RGM-241A Muraena (export designation: Seezielflugkörper Muraena ("anti-ship missile Muraena") or Shipboard missile "Muraena") is a ship-launched, sea-skimming, short-range, supersonic anti-ship, surface-to-surface missile propelled by an air-breathing ducted rocket motor. Primarily intended for arming surface combatants as small as patrol craft it has also been adapted for air launch and ground-launched coastal defence. Guidance is provided by a strapdown inertial (INS/GPS) system allowing true fire-and-forget operation, with midcourse updates for over-the-horizon targeting capability, and a dual-mode seeker for enhanced hit probability that combines an active/passive radar with imaging infra-red terminal homing. The Muraena's ducted rocket powerplant, otherwise known as an integral rocket ramjet (IRR), provides the optimium performance at <200 km enabling the missile to fly a "supersonic all the way" trajectory. The missile cruises at wavetop height to minimise the radar horizon and warning time to the target.
The RGM-241A Muraena is a collaborative Etoilian-Lamonian project (Aerodyne and LAIX Arms) with missiles manufactured in both countries. Aerodyne acts as prime contractor and system integrator, and held responsibility for design of the propulsion system, missile airframe and guidance and navigation system, while LAIX Arms provided technical assistance during the design and development process and supplies component parts including the high energy warhead and coherent K-band monopulse planar array active radar seeker taken from their earlier LinkLA-99 Inferi subsonic anti-ship missile.
Developed to replace the Boeing RGM-84L Harpoon and MBDA MM-40 Exocet as used by the respective navies of the partner nations, the RGM-241A Muraena is in the same class as rocket-ramjet missiles like the Zvezda MA-31 (Kh-17 Krypton), BrahMos PJ-10, MBDA CVS401 Perseus and MBDA ASMP (Air-Sol Moyenne Portee), but is more compact by virtue of an all-composite airframe construction and high density/high energy solid propellant fuel.
The missile is composed of four sections: seeker section, guidance and control section, warhead section and propulsion section. It is 4.6 m in length, with a body diameter of 36 cm and overall diameter of 44 cm, a span of 56 cm, and weighs 907 kg (2,000 lb) at launch including the 221 kg warhead. It is cylindrical in shape with a low drag high fineness radome and four inverted two-dimensional ramjet motor air intake ducts with inlet strakes running two-thirds (2/3) the length of the airframe. The aft end features four cruciform clipped folding delta moving controls fins for bank-to-turn manoeuvrability, with electric actuators housed in the inlet strakes that surround a infra-red suppressing conical rocket nozzle. To minimise weight, radar and thermal signature the airframe is largely made from carbon fibre reinforced thermoset plastics manufactured by vacuum formed resin transfer moulding (RTM) of thermoset resin over a high-strenth carbon fibre honeycomb core.
The high energy warhead is developed by LAIX Arms and is a 221 kg two-stage semi-armour piercing high explosive incendiary (SAPHEI) type initiated by a contact-delay fuse and "slapper" type all-electric detonation mechanism. It consists of a hardened steel carapace, strengthened steel ballistic cap and high explosive filler. It contains a primary charge with 51.84 kg cast-cured plastic bonded explosive (PBX) filling of Composition B2214, and secondary charge with 8.16 kg metal augmented charge (MAC) filler containing a combustible mixture of zirconium reactive metal particles to produce after-penetration incendiary effects.