page_title: Unrotated Projectile
hierarchical_section_title: Unrotated Projectile
caption_attribution_description: English: IWM caption&#160;: Looking forward from the bridge of the NELSON. On top of the 16" turrets can be seen the UP's. Comment&#160;: UP = Unrotated Projectile, an ant-aircraft rocket trialled unsuccessfully in the early stages of World War II. See also&#160;: File:16 inch gun turrets and Unrotated Projectile launchers on HMS Nelson 1940 IWM A 1995.jpg
context_page_description: The Unrotated Projectile, or UP, was 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 or 3 inches 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.
context_section_description: The Unrotated Projectile, or UP, was 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.
caption: Launchers on the roof of B and X turrets on HMS Nelson, 1940
exif: {"Image XResolution": "300", "Image YResolution": "300", "Image ResolutionUnit": "Pixels/Inch", "Image YCbCrPositioning": "Centered", "Image Copyright": "Imperial War Museums"}