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Below the mach number 0.5 the flow is considered as incompressible flow.

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Below the mach number 0.5 the flow is considered as incompressible flow.

(a) True

(b) False

I have been asked this question in exam.

My question is based upon Aircraft Force Systems in division Aircraft Force Systems and the Equations of Motion of Aircraft Performance

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Correct option is (a) True

For explanation: Below the mach number 0.5 the flow is considered as incompressible flow. In the region 0.5 < M < 0.8 the flow becomes compressible and significant but leads to small changes in the lift and drag characteristics.

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