Bouncing bomb principle as used by the Dambusters during WWII. The bomb (called Upkeep) was designed to be dropped at 60 feet approximately 1/3 of a mile from the dam. the bomb would strike the wall of the dam and due to the 500 rpm backspin imparted on it roll down the wall and detonate at 30 feet. The GIF incorrectly shows the bomb sinking near to the dam.
Schemat działania bomby skaczącej. Animacja jest nieprawidłowa. Bomba faktycznie stacza się po betonowej zaporze w ostatniej fazie ataku i wybucha przy jej podstawie, na dnie (porównaj poprzednią animację)
{{Information |Description=Bouncing bomb principle as used by the ''Dambusters'' during WWII. The bomb (called ''Upkeep'') is dropped close to the surface of the lake and then bounces due to its high velocity. It finally reaches the area close to the dam