In Service: 1943 to 1945
First Flight:
Manufacturer: Ruhrstahl
Number built: 1,300
Type: Air-to-Air Missiles
Guidance system: line control
Length: 2.10 m
Wingspan: 0.86 m
Diameter: 0.220 m
Weight: 60 kg
Engine: 1 ×
BMW
109-558 liquid fuel rocket engine producing up to 375
kg of thrust
Maximum speed: 900 km/h
Range: km
Warhead: 2.9 km
Fuze:
Launch Platform: Ju
88,
Ju
188,
Fw 190,
Me
262
Operators: Luftwaffe
Variants:
Other: Missiles
Articles:
The Ruhrstahl X-4 was a air to air missile. Designed and developed
by
Ruhrstahl
AG in 1943 under the leadership of Dipl.-Ing. Max
Otto Kramer.
The Ruhrstahl X-4 was also known as the Kramer X-4.This weapon
was intended to be deployed against Allied bomber formations
out of the range of their defensive weapons. Dipl.-Ing. Max
Otto Kramer had been experimenting since early 1938, with
remote control freefalling bombs, and in 1940. Kramer
joined
Ruhrstahl
AG.
The Ruhrstahl X-4 had a cigar shaped body for centrally mounted
swept back fins and four small tailfins. Two of the opposing
central fins held the streamline parts of a wire control bobbins,
and a spoiler control was fitted in each of the four tailfins,
the rocket motor used was 1 ×
BMW
109-558 liquid fuel rocket engine producing up to 375
kg of thrust. The wire link control system was employed for
the Ruhrstahl X-4 which used Düsseldorf FuG 510 transmitter
and the Detmold FuG 238 receiver, detonation was achieved
by several methods impact fuse, Kranich or Meise proximity
fuse. In the event of the missile missing the intended target
the missile was self-destruct when the rocket motor ran out
of fuel.
Testing of Ruhrstahl X-4 began on the 11 August 1944 using
a
Fw 190 as a carrier
aircraft however the
BMW
109-558 rocket engines were not ready, and so the
Schmidding
109-603 solid fuel rocket engine producing up to 150 kg
of thrust was used. testing continued from
Karlshagen
using several different types of carrier aircraft
Ju
88,
Ju
188,
Me 262
until early February 1945.
Ruhrstahl
AG produced 1,000 Kramer X-4 airframes at its Brackwede
factory and
BMW
had produced approximately 1,300
BMW
109-558 rocket engines at its Stargard factory but due
to
BMW
factory being heavy bombed all were lost, which effectively
ended any chance of getting Kramer X-4 operational.
The Warplanes of the Third Reich.
ISBN-10: 0385057822
German Aircraft of the Second World War.
ISBN-10: 0370000242
Hitler's Luftwaffe.
ISBN-10: 051718771X
For a complete list of
sources