Project HARP
Videos
Project HARP, for high altitude research project, was a joint venture of the United States Department of Defense and Canada's Department of National Defence created with the goal of studying ballistic
HARP 16-inch (410 mm) gun at its test site in Barbados (Coordinates: 13°4′38.3″N 59°28′32.48″W / 13.077306°N 59.4756889°W / 13.077306; -59.4756889)
Abandoned HARP gun in Barbados
V-3 cannon
Videos
The V-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. Two full-size guns were built
Project HARP
…16"/50 caliber Mark 7 gun V-3 cannon Vengeance Weapon 3 Schauer, Mark (May 11, 2018). "New technology testing may achieve the goals of HARP "space" gun". U.S. Army…
The prototype V-3 cannon at Laatzig, Germany (now Zalesie, Poland) in 1942.
Remains of V-3 in Zalesie near Międzyzdroje, Wolin Island, Poland (2008)
Accelerating gun (1881) by James Richard Haskell
Accelerating gun by Lyman and Haskell (1883).