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1.50 basic nozzle 20 percent 3.2 Exhaust-nozzle total air-flow ratio ambient-pressure ratio Basic hemisphere diameter basic nozzle diameter basic reverse-thrust ratio Basic spacing ratio boattail fell CHARACTERISTICS OF HEMI Coats Committee for Aeronautics convex boattail Copies obtainable cylinder diagrs duction amounted E55E18 National Advisory exhaust nozzle opened fect on reverse-thrust fell below atmospheric Figure 14 flat plate installed flow turn angle Fred function of hemisphere hemisphere sizes hemispherical target-type thrust hemispherical thrust reverser high values improvements in performance Jack G location parameter marily a function McArdle NACA RM E55E18 National Advisory Committee nozzle opened slightly obtainable from NACA PERFORMANCE CHARACTERISTICS Performance of hemispherical performance were obtained Pn/Po ratio was found ratio were obtained resultant reverse force Reverse-thrust performance reversed flow attached reversers by operating reversers was obtained RM E55E18 National shapes had little shown in figure Slight improvements SPHERICAL TARGET-TYPE THRUST Steffen target-type thrust reversers values of reverse-thrust Various boattail shapes