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Answer» What is Unrotated Projectile mean? The Unrotated Projectile, or UP, was a 7-inch anti-aircraft rocket developed for the Royal Navy by Alwyn Crow at the Ministry of Supply's Projectile Development Establishment at Fort Halstead. It proved unreliable and ineffective in operation, prompting the withdrawal of the system during 1941. Continued development of the basic concept led to the UP-2 and UP-3, which had smaller diameters of 2 inches (51 mm) or 3 inches (76 mm) (respectively) but longer in length. The latter was used as the basis of the Z Batteries, and later developed in air-to-ground form as the RP-3, most famously used on the Hawker Typhoon. reference
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