The Jagdfaust design was based on the
Schräge Musik, the manually triggered upward-firing air-to-air
cannon extensively deployed with the
Luftwaffe night fighter squadrons.[
citation needed]
The
Komet was so fast that pilots found it difficult to fire enough cannon rounds to destroy a bomber in a single pass. The Jagdfaust was developed to address this problem. A 5 cm shell was mounted in a launch tube held in place by a pair of
thin pins. Four such tubes were mounted vertically (to fire upward) in each wing. To ensure it would be fired at the correct time, the weapon featured a simple form of automated trigger in which an
optical photocell detected the dark silhouette of an
Allied bomber replacing bright blue sky and triggered the firing of the armed Jagdfaust guns. When the weapon fired, the force of the launch would break the pins holding the tube in place and the heavy tube would be ejected downward to offset the momentum of the explosive force of the shell. As a result, the plane's flight was not affected.
[1]
The Jagdfaust used a 5 cm "Minengranate"
shell, whose thin walls traded fragmentation for additional
explosives; when detonated within an aircraft with
sheet metal skin, the skin would be blown off to devastating effect. The entire weapon was designed for economy. Because it was intended for short range use, the
shell had an aerodynamically inefficient shape that could be easily forged or stamped. Its tolerances were loose, as its long-range accuracy was not an issue. Instead of a driving band, the shell flared at its base and was machined to engage the
rifling. The launch tube was made of soft unalloyed
steel since it would not need to keep its rifling over multiple firings. The shell used a simple type of
fuse instead of the more complex and expensive AZ 39 Safety Fuse. It was probably shipped pre-assembled and ready to install.
[2]