The Land Mattress' name came from its naval counterpart, the Sea Mattress, a similar system used for bombarding beaches prior to landing. Notably, the Land Mattress design used components from various sources. For example, the rocket motor from the RP-3 Aircraft Rocket, the 3 kilogram warhead from the naval Sea Mattress, and discarded fuses deemed unsafe by the British Royal Army. By using the RP-3's aircraft rocket motor and rifling the rocket tubes, the Land Mattress' rockets were given a degree of spin, thus increasing accuracy and maximum range. The muzzle velocity of these rockets was about 353.5 meters per second, with the system taking about seven seconds to completely empty its racks of rockets.