The military jet aircraft

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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The military jet aircraft has a gross weight of 28,000 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/ft is sucked into the intake ducts
at the rate of 112 Ib/sec with a static pressure of -0.28 Ib/in.? (gage) across the duct entrance. The total cross-sectional
area of both intake ducts (one on each side) is 1630 in.? The air-fuel ratio is 16.2, and the exhaust velocity u is 2630
ft/sec with zero back pressure (gage) across the exhaust nozzle. Compute the initial acceleration a of the aircraft upon
release of the brakes.
Answer: a =
ft/sec2
Transcribed Image Text:The military jet aircraft has a gross weight of 28,000 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/ft is sucked into the intake ducts at the rate of 112 Ib/sec with a static pressure of -0.28 Ib/in.? (gage) across the duct entrance. The total cross-sectional area of both intake ducts (one on each side) is 1630 in.? The air-fuel ratio is 16.2, and the exhaust velocity u is 2630 ft/sec with zero back pressure (gage) across the exhaust nozzle. Compute the initial acceleration a of the aircraft upon release of the brakes. Answer: a = ft/sec2
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