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Who developed the momentum theory?

(a) Daniel Bernoulli

(b) Ludwig Prandtl

(c) Osborne Reynolds

(d) W.J.M. Rankine

I had been asked this question in an interview for job.

I would like to ask this question from Momentum Theory topic in portion Helicopter Dynamics of Aerodynamics

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Correct answer is (d) W.J.M. Rankine

To explain: The momentum theory was developed by W.J.M. Ranking initially for marine propellers in the year 1865 along with R.E. Froude in the same year. This theory was later extended in 1920 by A.Betz who incorporated the slipstream rotation.

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