Ruhrstahl X-4

Ruhrstahl X-4
Surviving example at the NMUSAF
TypeAir-to-air missile
Place of originNazi Germany
Service history
In serviceNot operational
WarsWorld War II
Production history
ManufacturerRuhrstahl AG
Developed intoRuhrstahl X-7

The Ruhrstahl Ru 344 X-4 or Ruhrstahl-Kramer RK 344 was a wire-guided air-to-air missile designed by Germany during World War II. The X-4 did not see operational service and thus was not proven in combat but inspired considerable post-war work around the world, and was the basis for the development of several ground-launched anti-tank missiles.