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(20%) Problem 5: A frequently quoted rule of thumb in aircraft design is that wings should produce about 1000 N of lift per s> A 50% Part (a) At takeoff, an aircraft travels at 67 m/s, so that the air speed relative to the bottom of the wing is 67 m/A 50% Part (b) How fast must air move over the upper surface at a cruising speed of 246 m/s and at an altitude where air dens

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Answer #1

a)

considering bernoulli's theorem

dP = 0.5 rho (v2^2 - v1^2)

1000 = 0.5* 1.29* ( v2^2 - 67^2)

v2 = 77.713 m/s

======

b)

similarly

1000 = 0.5* (1.29/4)* ( v2^2 - 246^2)

v2 = 258.3 m/s

======

Comment before rate in case any doubt, will reply for sure.. goodluck

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