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Consider external flow dynamic pressure as 2000psf and static pressure as 800psf. find the approximate value of Mach number.(a) 1.9(b) 5(c) 4.5(d) 2.78The question was asked in exam.My enquiry is from Flight Mechanics topic in chapter Performance and Flight Mechanics of Aircraft Design

Answer» CORRECT answer is (a) 1.9

Explanation: Mach NUMBER = (dynamic pressure / (0.7*STATIC pressure))^0.5

= (2000 / (0.7*800))^0.5

= 3.571^0.5 = 1.88 = 1.9.


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