The military jet aircraft has a gross weight of 30,000 lb and is poised for takeoff with brakes set while the engine is
Posted: Wed May 04, 2022 9:59 am
The military jet aircraft has a gross weight of 30,000 lb and is
poised for takeoff with brakes set while the engine is revved up to
maximum power. At this condition, air with a specific weight of
0.0753 lb/ft3 is sucked into the intake ducts at
the rate of 116 lb/sec with a static pressure of -0.32
lb/in.2 (gage) across the duct entrance. The total
cross-sectional area of both intake ducts (one on each side) is
1880 in.2 The air–fuel ratio is 16.2, and the
exhaust velocity u is 2810 ft/sec with zero back
pressure (gage) across the exhaust nozzle. Compute the initial
acceleration a of the aircraft upon release of
the brakes.
Note: The answer is not 11.1 or 10.86
poised for takeoff with brakes set while the engine is revved up to
maximum power. At this condition, air with a specific weight of
0.0753 lb/ft3 is sucked into the intake ducts at
the rate of 116 lb/sec with a static pressure of -0.32
lb/in.2 (gage) across the duct entrance. The total
cross-sectional area of both intake ducts (one on each side) is
1880 in.2 The air–fuel ratio is 16.2, and the
exhaust velocity u is 2810 ft/sec with zero back
pressure (gage) across the exhaust nozzle. Compute the initial
acceleration a of the aircraft upon release of
the brakes.
Note: The answer is not 11.1 or 10.86