Compared to the Germans and the Soviets, the British (along with the Americans) were late in developing useful portable rocket projectors as additional artillery support systems. Such weapons proved their value along the East Front where they were used with extreme lethality to soften concentrations of enemy forces at range. While largely inaccurate per individual rocket fired, a collection of rockets landed in an area offered excellent saturation and offered the secondary benefit of being psychologically detrimental to enemy forces finding themselves on the receiving end of such instruments. The British eventually introduced their famous "Land Mattress" rocket projector during the latter half of 1944. Its long form name was "Projector, Rocket 3-inch, No. 8 Mk 1".
Its rocket payload revolved around the RP-3 ("Rocket Projectile 3-inch") rocket, an air-to-surface High-Explosive (HE) rocket already in use with British warplanes and known by its 60lb warhead as the "60lb". Each rocket held a diameter of 76.2mm and mounted a 5" TNT/TN/RDX-filled naval shell as its warhead. Propulsion came from a solid fuel rocket with cordite as its propellant. Muzzle velocity of each exiting rocket was rated at 1,160 feet per second, the entire salvo able to be launched in around seven seconds. The unit held a maximum engagement range of 7,900 yards which provided plenty of "reach".
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