The Influence of the Application of Power during Spin Recovery of Multiengine Airplanes Page: 2 of 8
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NATIONAL ADVISORY COMM ETE FOR AERONAUTICS
TECHNICAL MEMORANDUM 1219
THE INFLUENCE OF TEE APPLICATION OF POWER DURING
SPIN RECOVERY OF MILTIEGfINE AIRPLANES*
By P. EHhler
TECH LIBRARY KAFB, NM I
The effect of application of power, so far not clarified, is
investigated in the prdsent report in order to give the pilot,
in addition to the control measures, an expedient for spin
recovery of multiengine airplanes. To this end, a series of
spins was performed with an airplane of the Go 150 type. ._Et
was possible to set up a uniform rule regarding the effect of
power, for right and left spins as well as for any combination
of the direction of rotation of the propellers.
II. EFFECTS OF THE PROPELLER THRUST AND THE GYROSCOPIC
III. PERFORMANCE OF THE TESTS .
A number of recent spin accidents of multiengine airplanes gave
cause to investigate the effect of the propeller during spin recovery.
The present brief report will show the principal effects of the appli-
cation of power and illustrate them by the results of a few test flights.
Due to the gyroscopic moment of the propeller the effect of application
of power will be different for right and left spins. Hence the tests must
be performed in both directions; for every engine combination. Due to the
centrifugal forces and particularly to the additional gyroscopic moments
caused by application of full power, the stress on the suspension of the
outer engine may exceed the breaking-load. Thus an airplane of the .
Go 150 type was chosen for the tests because the engines are located at
a small lateral distance from the center of the fuselage and are subjected
to small centrifugal accelerations (fig. 1).
*"Einfluss des Gasgebons beim Beenden des Trudelns mehrmotoriger
Flugzeuge." Zentrale fur wissenschaftliches Berichtswesen der Luftfahrt-
forschung des Generalluftzeugmeisters (ZWB), Berlin--Adlershof,
Forschungsbericht Nr. 1536, February 12, 1942.
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Höhler, P. The Influence of the Application of Power during Spin Recovery of Multiengine Airplanes, report, June 1949; (https://digital.library.unt.edu/ark:/67531/metadc64689/m1/2/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.