Lockheed TriStar by Graham M. Simons

Author:Graham M. Simons [Simons, Graham M.]
Language: eng
Format: epub
Published: 2021-11-29T00:00:00+00:00

The first two TriStars in flight together. Visible on the top of the fin of N31001, the TWA machine is a ‘trailing cone’. This device was present on all development aircraft during the first weeks of flight tests. The nylon cable was deployed in flight, generally, 1 to 1.5 times the wingspan length, behind the aircraft to measure the ambient atmospheric pressure - or static pressure - precisely, in the ‘free-stream air-flow’ outside the disrupted air-flow generated by the aircraft - a key parameter for the pilots. The static pressure was essential to measure the aircraft’s exact airspeed and altitude. The static pressure was therefore fundamental to measure the performance of a test aircraft. (Lockheed)

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