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The Unrotated Projectile (UP) was a British anti-aircraft and ground-bombardment rocket of the Second World War. The original 7-inch version was developed for the Royal Navy by Alwyn Crow of the Projectile Development Establishment of the Ministry of Supply at Fort Halstead. These were generally similar in layout to contemporary mortar shells ...
They fired projectiles weighing from 1,900 to 2,700 lb (860 to 1,220 kg) at different muzzle velocities, depending on the projectile. When firing armor-piercing projectiles, their muzzle velocity was 2,500 feet per second (760 m/s) with a range of up to 24 mi (39 km). At maximum range the projectile spent almost 1 + 1 ⁄ 2 minutes in flight ...
The Mk 7 Mod 0 Encased, Common Practice rocket is used in training. The warhead consists of a blue plastic projectile attached to a rocket motor similar to the HEDM rocket. The rocket contains no explosive. It does not damage a target except by kinetic energy. On impact, the plastic warhead ruptures, dispensing an inert white spotting powder.
Three versions of this breech-loading rifled naval gun were produced, the 6-inch/47 Mark 16 Mod 0, the 6-inch/47 Mark 16 Mod 1, and 6-inch/47 Mark 17. "6-inch /47" refers to a bore diameter (caliber) of 6 inches (152 mm) and a bore length of 47 calibers (ie 47 × 6 inch; 23 feet 6 inches (7.16 metres). "Mark 16" indicates it is the 16th design ...
The propellant has low pressure and gives the projectile an average velocity of 78–84 m/s (256–276 ft/s) depending on the ammunition type. ... MK281 Mod 1 P ...
A very high rotation on a fin-stabilized projectile can also increase aerodynamic drag, further reducing impact velocity. For these reasons APFSDS projectiles are generally fired from smoothbore guns, a practice that has been taken up for tank guns by western and eastern blocs.
The powder case completely fills the volume of the chamber, and its length seats the projectile's rotating band into the bore's rifling. This is different from a naval bag gun. In a bag gun: (1) The projectile, by itself, is power rammed into the chamber until its rotating band is seated in the bore's rifling. (2) The rammer is retracted.
The original SPR used an early PRI flip-up front sight with an elevation dial, which has since been discontinued. The Mk 12 MOD 0/H uses the current PRI flip-up front sight. The SPR/A, SPR/B, and Mk 12 MOD 1 use the KAC rail forend flip-up front sight, KAC part number 99051. The SPR and Mk 12 MOD 0/H use the ARMS #40 flip up rear sight.