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The Ordnance Quick-Firing 17-pounder (or just 17-pdr) [note 1] was a 76.2 mm (3 inch) gun developed by the United Kingdom during World War II. It was used as an anti-tank gun on its own carriage, as well as equipping a number of British tanks. Used with the APDS shot, it was capable of defeating all but the thickest armour on German tanks.
The Littlejohn adaptor/APCNR combination gave the 2 pounder a similar effect as the armour-piercing discarding sabot round used with the much larger and heavier QF 6 pounder gun. The muzzle velocity of the APSV Mark II shell was 1,143 m/s compared with the 792 m/s of the normal 1.2 kg APCBC shell.
DB-17 was the designation for B-17s converted as drone director aircraft. They would be used to guide the QB-17 target drones during the missile tests. [1] [3] When they were worn out or the need was diminished, other postwar military B-17s would more often than not be sent to Middletown and converted to the QB-17 drone configuration.
It was superseded for anti-torpedo boat defence in the mid-1880s by the new generation of Hotchkiss and Nordenfelt "QF" guns of 47 mm and 57 mm calibre, firing exploding "common pointed" shells weighing 3–6 lb (1.4–2.7 kg). Royal Navy deck mounting of the QF 3-pounder Hotchkiss, the first modern QF gun, 1915
Ordnance QF 6-pounder: Anti-tank gun 57 mm 2.244 inch Ordnance BL 10-pounder Mountain gun: Mountain gun 69.8 mm 2.75 inch 12-pounder (multiple types) Light field gun 76.2 mm 3 inch Ordnance QF 13-pounder: Light field gun 76.2 mm 3 inch 15- pounder (multiple types) Field gun 76.2 mm 3 inch Ordnance QF 17- pounder: Anti-tank gun 76.2 mm 3 inch
The 17 pdr SP Achilles was basically a modified M10, the principal difference being the gun. The main armament of the Achilles was the Ordnance QF 17-pounder, a substantially more powerful gun than the 3 inch (76.2 mm) M7 mounted on the standard M10. The single top-mounted .50 inch (12.7 mm) M2 Browning heavy machine gun was retained.
In World War II a different system was introduced for varying charges for the QF 25 pounder gun-howitzer, which used separate-loading QF ammunition. A separate 2.7-pound (1.2 kg) "super charge" cartridge was available for firing the 20-pound (9.1 kg) high-velocity anti-tank AP shot, and an additional 4.5-ounce (130 g) "super charge increment ...
A newer type of adapter is a type of MP3 player shaped like a cassette tape, [4] [5] which can be used as a stand-alone MP3 player with headphones or inserted as a cassette into the cassette player, where it can be used with a remote control. These usually have a double-sided head which means they can work in both directions.