Nazi Germany’s Space Bomber
By:
Mr. R. Colon
rcolonfrias@yahoo.com
PO Box 29754
Rio Piedras, Puerto Rico 00929
When Germany unveiled its
Sanger II space ship, a low-orbit, two stage shuttle vehicle
capable of taking off and landing on conventional runways,
at the 1986 Farnborough Air Show; it was a tribute to the
work of the late German engineer Dr. Eugen Albert Sanger and
his pioneering research in Germany into ram jet engines and
advance rocketry. Work that provided the basis to one of the
most advanced designs ever: the Space Bomber. Sanger was
born in Bohemia in 1905. Since his early years, Sanger was
fascinated by the words of Hermann Oberth, a famous space
exploration writer. Oberth envisioned humans reaching low
earth orbit utilizing a multi-stage missile system. It would
be Oberth’s book, Rocket to the Planets, first published in
1923, that would lead Sanger to this strange new and
developing field: rocketry. Sanger assimilated Oberth’s
ideas and went further. He believed early on that if humans
were to explore the universe, they did not necessarily need
a multistage rocket to reach orbit, he championed the idea
of using what he called an “stratospheric aircraft” to reach
earth low orbit. In the summer of 1933, Sanger published a
book titled Rocket Flight Technique in which he detailed his
ideas for the development of an orbiting, manned space
station.
The feedback from the still-infant aerospace community in
Germany and the rest of the world was impressive. The
success of Rocket lead Sanger to write, between 1934 and
1936, several major papers for the influential aviation
magazine Flug, an Austrian publication well regarded in the
aviation community. These papers caught the eyes of
Luftwaffe officials who immediately realized the potential
of rocket engines in the development of advance fighters and
bombers. He was recruited in the fall of 1936 to work at the
Hermann Goring Institute. There, Sanger was assigned the
task of developing functional ram jet engines for fighters.
He focused his attention on the development of an
air-breathing engine. He started his research gathering all
the information he could from a 1905 patent filed by French
aviation pioneer Rene Lorin. Lorin’s original research data
proved that air compressed inside an aluminium tube and
expanded by a combustion reaction would generate an enormous
amount of thrust.
By November 1941, Sanger’s team
was producing concrete results. In one experiment, he
mounted a sewer pipe atop an Opel truck. The truck was
driven at 55mph, forcing air into the pipe, at the same
time; gasoline was injected into the centre of the pipe and
ignited. The result was nothing short of spectacular. The
combustion was successfully maintained as long as the truck
keep going at the same speed and the gasoline kept igniting.
The results were so successful, that Sanger’s team commenced
the development of an operational ram jet the following
spring. In mid 1942, a newly design ram jet was fitted in
the top of the fuselage of a Dornier 217E bomber. The engine
performed flawlessly. It sustained its thrust as long as the
fuel lasted. In fact, the experiment would have been even
more impressive if the aircraft selected, the above
mentioned Dornier 217E, could had handled the speeds the
engine was capable of. The ram jet engine installed on this
particular sample 217E was capable of speeds around 600mph
while the aircraft’s fuselage could only sustain pressures
at speeds of 350mph.
While performing his duties to the Luftwaffe, Sanger never
lost track of his ultimate goal. The development of an
aircraft capable of reaching low orbit. By early 1944,
Sanger must have been aware of the ultra secret work being
performed on Germany’s planned long range bomber, the A9 or
America Bomber. Originally conceived in 1929; the Sanger
concept of a bomber calling for a winged rocket design. He
performed calculations on the design and, along with his
wife, mathematician Irene Bredt; came up with the idea of an
atmosphere re-entry platform. This vehicle would offer high
payload and almost unlimited range since the aircraft would
be “flying” in space, using small fuel cells, the low earth
orbit and gravity would act as the aircraft’s main
propulsion system. He proceeded to write a report titled On
a rocket Propulsion Engine for Long Distance Bombers, in an
attempt to gain government financial support for the
development, and eventual production of what he called the
Rocket Bomber. But by this time the tide of war had changed
for Nazi Germany. Fighting for its survival, Nazi leaders
needed weapon systems now, not another long term developing
program. Sanger never got the financial resources he
requested.
Nevertheless, Sanger and Bredt worked around the clock on
his idea of a rocket bomber and in the spring of 1944, they
produced a major paper on the benefits of his design, He
distributed it to all the major players in Germany’s
aerospace industry. Wernher von Braun, Werner Heisenberg,
Dr. Ernst Heinkel, Willy Messerschmitt and Professor Dornier
got copies of the paper. The paper explained in
extraordinary detail, Sanger’s idea of a bomber capable of
bombing cities in the United States from bases in Germany.
He changed the name of the aircraft; it was now called the
Silverbird Bomber. The Silverbird was designed to be a
100-ton monster, of the 100 tons, 90 would be use to store
fuel.
The bomber would have been
launched into the air by a sled fitted with a rocket engine
capable of producing 610 tons of thrust for eleven violent
seconds. After which the plane would be propelled to around
5,500ft in the air. Once airborne, the bomber power plant
would ignite and the aircraft would climb steadily to an
altitude of 130,000ft, slightly above the twenty five mile
level of the denser atmosphere. It would then proceed to
dive into thicker air where its wings would make the bomber
ricochet back into a long and steep climb. This “ricochet”
along with the remainder of the bomber’s fuel, would enable
the aircraft to reach attitudes of around 160 to 175 miles
above the earth surface. The bomber would then maintain its
heading until it reaches its main target. The Silverbird
would continued its flight until it reached Japanese
controlled South Western Asia where it would deploy its
tricycle undercarriage to perform the landing manoeuvre.
The German government was so impressed with the report, that
it deemed it a State Secret. It was labelled with
instructions intended to forbid copying or photographic it.
It was placed in a steel safe and guarded twenty four-seven.
When Germany collapsed in May 1945, Sanger and his wife, as
well as many top ram jet engine engineers, went to work for
the French Air Ministry.
In 1952, ‘Rocket’ was
translated into English and became widely circulated among
the Western Democracies’ air force research facilities. In
the summer of 1954, Sanger and Bredt returned to Germany.
They immediately began working for the West Germany
government in the research of aircraft propulsion systems.
Over the years, historians and pundits had given many
different names to the Silverbird Bomber. Names such as the
Orbital Bomber or the Atmosphere Skipper to name a few, were
used to describe Sanger’s aircraft concept. But maybe the
name that more resonates with the public is that of the
Antipolar Bomber. Numerous articles and televisions
documentaries have described the concept as the Antipolar
Bomber.
As impressive as the Silverbird concept was, it never went
beyond the design stages. Several test mock-ups were built
and tested in wind tunnels during the 1950s, but with
advances in conventional jet engines, mainly fuel
consumption, the designs mock-ups never made it to the
drawing board. But the idea never went fully away. Today,
the United States utilize Sanger’s concepts in its
impressive Shuttle Re-entry Vehicle.
References
Top Secret Tales of World War II, New York, John Wiley &
Sons 2000
German Secret Weapons: Blueprint for Mars, New York,
Ballantine Books 1969
German Heavy Bombers, Atglen PA, Schiffer Publishing Ltd
1994 |