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".
Land Mattress weapons were tested under combat action during mid-1944 and saw service through to the end of the war in 1945 and for a time thereafter until retired from formal service. It was operated by both British and Canadian forces.
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