GATE Aeronautical Engineering - GATE 2017-2018 Questions and Answers

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An aircraft is trimmed straight and level at true air speed (TAS) of 100 m/s at standard sea level (SSL). Further, pull of 5 N holds the speed at 90 m/s without re-trimming at SSL (air density = 1.22 kg/m³). To fly at 3000 m altitude (air density = 0.91 kg/m³) and 120 m/s TAS without re-trimming, the aircraft needs

1.95 N upward force.

1.95 N downward force.

1.85 N upward force.

1.75 N downward force.

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