Project Babylon
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Project Babylon was a space gun project commissioned by then Iraqi president Saddam Hussein. It involved building a series of "superguns". The design was based on research from the 1960s Project HARP
Two sections of Big Babylon that have been bolted together at Royal Armouries, Fort Nelson, Portsmouth.
A section of the Iraqi "supergun" from Imperial War Museum Duxford
V-3 cannon
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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 Babylon
…a very pronounced "signature" which would have revealed its location. Since it was immobile, it suffered from the same vulnerability as Germany's V-3 cannon, which the RAF readily destroyed in 1944. Also, Iraq already had Scud missiles which were far more effective than the outdated supergun technology…
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).