German Special Air-Air Anti-Bomber Weapons

[Adler]

Not sure if this was already mentioned, but the Luftwaffe once had a proposal for a bomb that would go off when detecting a bomber's engine noise in close proximity. I do not think it was built.

 

[Atomic Coyote]

https://www.secretprojects.co.uk/threads/kramer-x-4-air-to-air-missile.6097/

The (MCLOS guidance) X-4 was planned to use an acoustic proximity fuse.