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National Advisory Committee for Aeronautics, Technical Notes - Measurements of Flying Qualities of an F-47D-30 Airplane to Determine Lateral and Directional Stability and Control Characteristics

Flight tests were made to determine the lateral and directional
stability and control characteristics of an F—h7D-3O airplane. The
results of these tests showed the airplane stability to be weak direc—
tionally in low-speed conditions. In the power-off landing condition
and high—speed clean conditions, the directional stability was satis—
factory. The effect of increasing the altitude was to decrease the
stability. The general characteristics of the aileron control were satis-
factory, but the values of the aileron effectiveness were low and failed
to meet the Air Force handling—qualities requirements. The rudder—
force trim-change with change in power and speed was rather large and
objectionable to the pilot, although the forces encountered did not
exceed the specified requirements.

This paper presents an investigation of the flying qualities of
the F-h7D-3O airplane. Many flying—qualities investigations have been
conducted by the National Advisory Committee for Aeronautics with various
types of airplanes and this paper is intended to supplement this infor-
mation. By correlation of these data with pilot Opinions of these
airplanes, it has been possible to establish quantitative requirements
for satisfactory handling qualities such as those presented in refer-
ence 1.

Additional information is continually being obtained, however,
to determine whether the existing-requirements are adequate or whether
they should be modified in order to provide for conditions encountered
with airplanes of later design. Flight tests of the hinge-moment char—
acteristics of the F—hTD Frise type ailerons (measured individually)
are also presented. These ailerons had been modified to correspond to
a design recommended and tested by the NACA. A comparison between the
data obtained from these tests and those obtained from previous NACA
wind—tunnel tests of these ailerons is also presented. This paper
presents the data for the lateral and directional stability and control
characteristics of this airplane, as well as measurements of the aileron
hinge—moment characteristics.