Device for the Automatic Control of Airplanes Page: 2 of 10
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NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECHNICAL MEMORANDUM NO. 495.
DEVICE FOR THE AUTOMATIC CONTROL OF AIRPLANES. *
By Alfred Gradenwitz.
Franz Drexler, the inventor of the rudder-angle indicator,
has been working for almost two decades on the problem of the
automatic control of airplanes. At the sixteenth session of the
W. G. L. (Scientific Society for Aeronautics) in Wiesbaden, he
announced that he has finally found a practical solution. His
invention can be installed with four screws in any airplane.
It has three switch buttons, with which the three-part automatic
control can be switched on or off in whole or in part, thus leav-
ing the controls to be operated by hand or foot.
Drexler succeeded in mounting the three necessary controls
(aileron, rudder and elevator) in three separate boxes and in
combining them in one block with the hand and foot controls
(Fig. 1). The automatic elevator control is on the left. On
the opposite side is the aileron control, and both are connected
by a plate on which the rudder control is centrally located
(Fig. 6).
In order to simplify and cheapen its construction, the in-
ventor has endeavored, from the beginning, to use, in so far
as possible, like structural parts for all three controls.
*fSelbststeuerung fir Flugzeuge," from Der Motorwagen, March 31,
1928, pp. 204-206...
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Gradenwitz, Alfred. Device for the Automatic Control of Airplanes, report, January 1929; (https://digital.library.unt.edu/ark:/67531/metadc65347/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.