V-3 cannon

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50°51′15″N 1°45′30″E / 50.85417°N 1.75833°E / 50.85417; 1.75833

Hochdruckpumpe ("high-pressure-pump")[1]
The prototype V-3 cannon at Laatzig, Germany (now Zalesie, Poland) in 1942.
Type	Large-caliber artillery
Place of origin	Germany
Service history
In service	1944–1945
Used by	Germany
Wars	World War II
Production history
Manufacturer	Krupp[2]
Specifications
Length	130 m (430 ft)[3]
Shell	140 kilograms (310 lb)
Caliber	150 millimetres (5.9 in)
Elevation	fixed
Traverse	fixed
Rate of fire	0.2 rpm (projected)[4]
Muzzle velocity	1,500 metres per second (4,900 ft/s)
Maximum firing range	165 km (103 miles)

The V-3 (German: Vergeltungswaffe 3, ("Vengeance Weapon 3") was a German World War II large-caliber gun working on the multi-charge principle whereby secondary propellant charges are fired to add velocity to a projectile. It was built in tunnels and was permanently aimed at London, England.

The Germans planned to use the weapon to bombard London from two large bunkers in the Pas-de-Calais region of northern France, but they were rendered unusable by Allied bombing raids before completion. Two similar guns were used to bombard Luxembourg from December 1944 to February 1945.

The V-3 was also known as the Hochdruckpumpe ("High Pressure Pump," HDP for short), which was a code name intended to hide the real purpose of the project. It was also known as Fleißiges Lieschen ("Busy Lizzie").^[5][6]