Development of an Instrument for the Accurate Measurement of Aircraft Airspeed and Altitude
Development of an Instrument for the Accurate Measurement of Aircraft Airspeed and Altitude

Author: G. G. Readett

Publisher:

Published: 1981

Total Pages: 28

ISBN-13:

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Aircraft Research and Development Unit has developed a trailing pitot-static probe suitable for determining pressure error corrections for aircraft airspeed and altitude systems. The instrument is suitable for use with helicopters where both pitot and static pressure measurements on the aircraft could be subject to pressure errors due to rotor downwash. The probe is accurate to better than 1% and was tested and shown to be satisfactory over a speed range of 40 to 120 knots. (Author).

Accuracy of Airspeed Measurements and Flight Calibration Procedures
Accuracy of Airspeed Measurements and Flight Calibration Procedures

Author: Wilber B. Huston

Publisher:

Published: 1948

Total Pages: 88

ISBN-13:

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This report reviews in detal the sources of error that may enter into the measurement of airspeed by pitot-static methods. Methods of flight calibration of airspeed installations are given. Special attention is given to the problem of accurate measurement of Mach number, air temperature, and true airspeed during high-speed maneuvers. This report also contains an extensive bibliography.

The SPB2 and SPBIV Airspeed-Altitude Recorders
The SPB2 and SPBIV Airspeed-Altitude Recorders

Author: B. Mierkowski

Publisher:

Published: 1968

Total Pages: 8

ISBN-13:

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The SPB-2 speed recorder was designed for determining basic flight parameters of training aircraft, velocity and altitude variations were determined with differential and evacuated membrane boxes, and the information was recorded on a paper tape. The recording accuracy of this instrument was approximately 3%. Since the SPB-2 recorder could not be used for measuring highly variable magnitudes, it was necessary to develop other instruments which would meet this requirement. Therefore, two modifications, the SPB-III and SPB-IV, were later developed. Although the two models are identical in size, their tape velocity is different. In the SPB-III model the tape translation speed is variable and averages 40 mm/sec, while the model IV has a constant translation rate of 2.5 mm/sec.