Measurement of the Maximum Speed Attained by the X-15 Airplane Powered with Interim Rocket Engines

Measurement of the Maximum Speed Attained by the X-15 Airplane Powered with Interim Rocket Engines
Author: Wendell H. Stillwell
Publisher:
Total Pages: 22
Release: 1960
Genre: Aerodynamics
ISBN:
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On August 4, 1960, a flight was made with the X-15 airplane to the maximum speed expected with the interim rocket engines. Fully corrected airspeed measurements showed that the maximum Mach number of 3/31 +/-0.04 and maximum true airspeed of 2,196 mph +/- 35 were attained at an altitude of 69,600 feet. At Mach numbers greater than 2.0 the pitot-static tube exhibited a negative static-pressure error which resulted in a Mach number correction of -0.18 at the maximum speed.

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:
Total Pages: 28
Release: 1981
Genre:
ISBN:
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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).

The Measurement of Air Speed of Airplanes

The Measurement of Air Speed of Airplanes
Author: F. L. Thompson
Publisher:
Total Pages: 16
Release: 1937
Genre: Airplanes
ISBN:
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Various methods of measuring the air speed of airplanes are described. Particular emphasis is placed on the procedure required to obtain precise measurements of speed by the use of the suspended pitot-static head or the suspended static head. Typical calibration curves for service installations of pitot-static heads are shown and the relation between errors in air speed and corresponding errors in observed altitude for such installations is discussed. There is included a brief discussion of various speed-course methods of measuring speed.