A summary of NASA data relative to external-store separation characteristics

Aerodynamic characteristics of external stores in carriage position and their effect on separation characteristics under various delivery condition

Preliminary calibration and test results from the National Transonic Facility

The National Transonic Facility (NTF) was operated to design condition of 120 million Reynolds number at a Mach number of 1.0. All systems were checked out except plenum isolation valves; modifications are being made to heaters on the actuators. Initial steady-state calibration indicates excellent steady flow characteristics. The first test of the Pathfinder 1 model indicated significant Reynolds number effects. Some effect of temperature on instrumentation were obtained. The cause of these effects is being evaluated

National Transonic Facility status

The National Transonic Facility (NTF) was operational in a combined checkout and test mode for about 3 years. During this time there were many challenges associated with movement of mechanical components, operation of instrumentation systems, and drying of insulation in the cryogenic environment. Most of these challenges were met to date along with completion of a basic flow calibration and aerodynamic tests of a number of configurations. Some of the major challenges resulting from cryogenic environment are reviewed with regard to hardware systems and data quality. Reynolds number effects on several configurations are also discussed

An Archaeological Survey of the Medio Creek Water Treatment Plant, Bexar County, Texas

The Center for Archaeological Research (CAR) of The University of Texas at San Antonio conducted a pedestrian survey and subsurface backhoe testing for cultural resources on the raw water pipeline route for the Medio Creek Water Treatment Plant and sites of the treatment plant and the raw water intake on the bank of the Medina River in southwestern Bexar County, Texas. The pipeline route traverses ca. 1.6 km of alluvial terrace associated with the Medina River and Medio Creek, including a crossing of Medio Creek. Limited geomorphological observations also were made. Few cultural remains were encountered, none diagnostic of a particular prehistoric period. One site, 41BX1259, was recorded at the planned location of the treatment plant. CAR determined that no significant cultural resources would be affected by construction of the intake facility or pipeline and therefore recommends that the project sponsor be allowed to proceed as planned

Maneuver and buffet characteristics of fighter aircraft

Recent research efforts in the improvement of the maneuverability of fighter aircraft in the high-subsonic and transonic speed range are reviewed with emphasis on the factors affecting aerodynamic boundaries, such as maximum obtainable lift, buffet onset, pitchup, wing rock, and nose slice. The investigations were made using a general research configuration which encompassed a systematic matrix of wing-design parameters. These results illustrated the sensitivity of section and planform geometry to a selected design point. The incorporation of variable-geometry wing devices in the form of flaps or leading-edge slats was shown to provide controlled flow over a wide range of flight conditions and substantial improvements in maneuver capabilities. Additional studies indicated that the blending of a highly swept maneuver strake with an efficient, moderately swept wing offers a promising approach for improving maneuver characteristics at high angles of attack without excessive penalties in structural weight