Flight Measurements of the Flying Qualities of Five Light Airplanes Page: 3 of 84
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NACA TN No. 1573
ailerons were ineffective in maintaining lateral control in a power-on
stall in any of the airplanes. Recovery from the stalled condition
was easily made on all airplanes by pushing the elevator control
forward.
Stalls from turning flight were possible with power on at all speeds
in three of the four airplanes tested but were generally impossible above
a certain airspeed with power off because sufficient elevator control
was not available. The initial roll-off in a stall from a sideslipped
condition was in the direction to cause the trailing wing to drop.
The small fixed wing-tip slots on one of the airplanes were found
to have no measurable effect on its flying qualities or stalling
characteristics.
INTRODUCTION
uuring the period beginning August 31, 1939 and ending July 27,
1940, the National Advisory Committee for Aeronautics conducted flying-
qualities tests on five light airplanes. Data on the individual
airplanes were not prepared in a form suitable for general release
because of the urgency of military work which had begun at that time.
The present paper gives a summary of data that has been compiled for
the purpose of making available the findings of the NACA in regard to
the stability and control characteristics of this type of aircraft.
The investigation comprised measurements of stability, controlla-
bility, and stalling characteristics. The results are based on data
obtained from photographtc records of continuously recording instru-
ments supplemented by pilots' observations.
TES TS
Description of Airplanes
Descriptive characteristics of the five light airplanes are given
in table I. Photographs of the five light airplanes are shown as
figure 1 and three-view drawings are shown in figure 2. All five
airplanes were two-place or three-place cabin land monoplanes and,
except for airplane 2, all had fixed landing gears. Airplane 4
was the only one that had wing flaps and/or slots. The control-eurface
gaps were unsealed, except in the case of the rudder and elevator of
airplane 2. The longitudinal trimming device consisted of an elevator
trim tab for airplanes i, 2, and 4; an adjustable stabilizer for
airplane 3; and an independent airfoil mounted below the horizontal
tail for airplane 5.2
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Hunter, Paul A. Flight Measurements of the Flying Qualities of Five Light Airplanes, report, May 1948; (https://digital.library.unt.edu/ark:/67531/metadc54901/m1/3/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.