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Fighter airplanes may have a seemingly limitless number of external store arrangements. Some practical considerations and some aerodynamic considerations must be taken into account in the arrangements of the external stores. The nature of the problems concerning the type of store arrangement involved and the type of airplane on which the stores are installed are reported.
BOMB RACKS, CONFIGURATIONStudies were made of experimental data to determine the effects of various external store characteristics, spanwise positions, and Mach number on the static longitudinal stability of various aircraft. Data used included results of wind tunnel tests run at the USAF Academy as well as tests run at the Arnold Engineering Development Center, the Naval Ship Research and Development Center and Breguet Aviation. External store characteristics considered were store frontal area, volume, and side projected area. The correlation between any of the three characteristics and change in static margin was approximately the same. Loss in static margin tended to increase to a maximum at moderate values of frontal area, volume, or side projected area and then to decrease for higher values. (Author).
The results from analysis of data obtained from wind tunnel tests, which were conducted to determine the effect of various external stores on the aerodynamic characteristics of the model F-4C airplane, are presented and discussed. The analysis includes evaluation of the static longitudinal stability, drag, and longitudinal control characteristics of the F-4C when loaded with the Pavestorm missile series, Modular Weapons series, Mark 84 EOGB, M-118 LGB, SUU-51B/B, SUU-30H/B, and Rockeye stores. Moreover, analysis of the probable cause as well as the wind tunnel verification of a pilot-reported 'tuck-under' problem with the F-4C when carrying the Pavestorm series of stores is presented and discussed. Incremental drag rise and neutral point shift associated with store loading are compared with results obtained from existing prediction methods and techniques. Data are presented for aircraft weights representative of each store loading at altitudes of sea level, 10-, 20-, and 30-thousand feet for aircraft center-of-gravity locations of 25, 33, and 36 percent of the mean aerodynamic chord over the Mach number range from 0.4 to 1.3. (Author).