Aerospace Engineering > GATE 2012 > Aircraft Performance
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
A
1.95 N upward force.
B
1.95 N downward force.
C
1.85 N upward force.
D
1.75 N downward force.

Correct : d

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aircraft trim true air speed TAS air density calculation GATE Aerospace Engineering 2012 GATE 2012 Q36 aerodynamic force flight mechanics aircraft stability analysis

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