Interstate | ||||||||||||||||||||
TDR Edna III
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Photo: Robert
Deering 4/18/2015 National Museum of Naval Aviation NAS Pensacola (NPA) Pensacola, Florida |
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The world's first legitimate cruise missile,
the TDR-1 was built around RCA's early
television. RCA's chief scientist, Dr.
Vladimir Zworykin, designed the system to be
used for final guidance. Interstate Aircraft
designed and manufactured the aircraft,
providing both radio control and facility
for a pilot so that the aircraft could be
ferried to a destination. Carrying a 1,000
lb. bomb or a torpedo, and controlled from a
TBM-1C Avenger control aircraft, the TDR saw
action In Pacific in September 1944. Two
months later it was withdrawn from combat.
In 1936, Commander Delmar Fahrney initiated
research relating to naval uses for
pilotless drones as anti-aircraft artillery
targets. By 1941, the advent of the radar
altimeter and television provided the means
for an effective system. David Sarnoff of
RCA offered his services to the War
Department; RCA's newly developed television
would be put to use in the war. RCA Chief
Scientist, Dr. Vladimir Zworykin, developed
a camera and receiver system that would
comprise the heart of a guidance system
along with gyro stabilization and a radar
altimeter.
Higher priorities for strategic materials
gave low priority to the project, and it was
decided that the airframe be made of pressed
wood over a tubular steel frame. Interstate
Aircraft of El Segundo, California, was
given the contract for 200 of the aircraft.
The tubular steel frame was sub-contracted
to Schwinn Bicycle Company, and other
components were provided by the Wurlitzer
Musical Instrument Company. Power plants
consisted of two non-military Lycoming
flat-head 6s of 230 horsepower each. While
designed as a drone, controls were provided
for a pilot, the cockpit canopy was
removable and a fairing would be installed
for drone operation. In that way, the
aircraft could be ferried to a destination
manually, while remote operation would be
limited to tactical employment.
The drone, designated TDR-1, was ready by
late 1942, but did not see action until
September 1944, when a unit designated
STAG-1 deployed with 50 TDR-1s to the
Russell Islands in the Southwest Pacific for
evaluation and use against Japanese-held
islands. During a two-month period, 50
drones were launched with 31 hits recorded
on anti-aircraft sites, bridges, airfields
and grounded ships. Guided by a modified
TBM-1C Avenger torpedo bomber, the drone
would be launched by a ground control crew,
and then turned over to the TBM pilot
already airborne over the field. Joined on
the drone, the TBM pilot would pass control
to the controller in the rear cockpit, who
would then guide the drone to the target,
his 5-inch TV screen receiving visual
signals from the TDR's nose-mounted camera.
By October 1944, the use of the TDRs ended,
the concept of precision-guided munitions
deemed of lesser priority in the Pacific due
to U.S. air superiority. The concept also
was tried in Europe, using war-weary,
explosive-laden B-17 and B-24 bombers in
Projects Aphrodite and Anvil, but with
little result. |
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SOURCE: National Museum of Naval Aviation |