Flight Evaluation J-TEC VT-1003 Vector Airspeed Sensing System
Final rept. for period ending Apr 1976
ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA
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The J-TEC VT-1003 vector airspeed sensing system was evaluated on an AH-1G helicopter in April 1976 by the United States Army Aviation Engineering Flight Activity at Edwards Air Force Base, California. The sensor was mounted above the main rotor plane of rotation throughout the evaluation. All tests were flown at approximately 8000 pounds gross weight, mid center of gravity, and a main rotor speed of 324 rpm. The linear calibrations provided for in the system were unacceptable above 50 knots true airspeed KTAS and nonlinear post- processing was required. Using the nonlinear calibrations, longitudinal errors above a skid height of 50 feet in forward flight above 10 KTAS were less than 3 knots. Errors were less than 6 knots between 10 KTAS forward and 30 KTAS rearward.