In the cryogenic mode of operation, the 0.3-M TCT can attain very high Reynolds numbers. Up to 405 pressures can be measured. On-line calibrations are performed as required to insure overall system errors not greater than 0.25 percent of full scale. Aerodynamic drag is determined by use of a wake rake attached to a dedicated 30-psid ESP scanner which is referenced to tunnel total pressure. Model attitude is computed using either a sensitive angular encoder or an accelerometer.
Thermocouples are available to measure temperatures either on the model or inside the tunnel.
The facility can also be configured for testing in either or SF6 and air. The first step of the test process is to submit a test request form. The form can be filled out electronically or printed for mailing at the Wind Tunnel Enterprise web site . A posttest questionnaire is also available at this site. Final data are reduced on a separate UNIX workstation.