The drag characteristics of an airplane are to be determinedby model tests in a wind
Chapter 7, Problem 7.65(choose chapter or problem)
The drag characteristics of an airplane are to be determinedby model tests in a wind tunnel operated at an absolute pressureof 1300 kPa. If the prototype is to cruise in standard air at 385km/hr, and the corresponding speed of the model is not to differby more than 20% from this (so that compressibility effects maybe ignored), what range of length scales may be used if Reynoldsnumber similarity is to be maintained? Assume the viscosity of airis unaffected by pressure, and the temperature of air in the tunnelis equal to the temperature of the air in which the airplane will fly.
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