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This document summarizes key concepts in drag polars and variations in drag coefficients for different types of aircraft: 1) Drag polars remain parabolic at transonic and supersonic speeds, but the zero-lift drag coefficient (CD0) and the quadratic drag coefficient (K) become functions of Mach number. 2) For subsonic jet transports, CD0 and K are roughly constant up to Mach 0.76, then increase with higher Mach numbers based on data from a Boeing 727. Equations are provided to estimate the variations beyo

Author

dinesh Babu

Language

EN