Flight Measurements of Flying Qualities of a P-47D-30 Airplane (AAF No. 43-3441) to Determine Longitudinal Stability and Control and Stalling Characteristics Page: 4 of 82
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NACA RM No. L8AO6 3
* ." or climbed the airplane to some certain speed and when the airplane
reached a steady condition, a record was taken of the required values.
* * In the continuous method the airplane was flown through the speed range
* with gradually changing'speed and the required values were recorded
'. throughout the entire period. The continuous records are indicated by
* flagged symbols.
Standard NACA photographic recording instruments were used to obtain
the data. A description of this instrumentation is given in reference 1.
CONTROL FRICTION AND TRAVEL
Plots of the friction and travel of the elevator, ailerons, and
rudder are shown in figures 6 to 9. The amount of friction in all of the
controls except the rudder was small and well within the requirements of
DISCUSSION AND RESULTS
LONGITUDINAL STABILITY AND CONTROL CHARACTERISTICS
Dynamic Longitudinal Stability
The short-period dynamic oscillation of normal acceleration and
elevator angle was investigated in the power-on clean, glide, and landing
conditions by abruptly deflecting and releasing the elevator at various
speeds throughout the speed range. There was no oscillation of the
elevator, but the airplane diverged longitudinally, sometimes violently,
at low speeds in the power-on clean condition. (See fig. 11.) This
unstable condition is in all probability due to the static longitudinal
instability of the airplane. Typical time histories of these attempted
oscillations are shown in figures 10 and 11.
Static Longitudinal Stability
The static longitudinal stability was measured at two center-of-
gravity positions of approximately 26 and.29 percent of the mean aero-
dynamic chord throughout the speed range for the configurations shown in
the preceding table. The curves of elevator force and elevator angle
plotted against speed are presented in figures 12 to 20 and show the
static longitudinal stability characteristics. The elevator tab angle
angle 5Stab was also measured and is given for each test made.
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Kraft, Christopher C., Jr.; Goranson, R. Fabien & Reeder, John P. Flight Measurements of Flying Qualities of a P-47D-30 Airplane (AAF No. 43-3441) to Determine Longitudinal Stability and Control and Stalling Characteristics, report, February 18, 1948; (digital.library.unt.edu/ark:/67531/metadc65259/m1/4/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.