1971-02-01

Installation and Integration of Transonic Transport Propulsion Systems 710762

The chief motivating factor in airplane design, throughout the history of commercial aviation, has been increased speed. Significant advances in the supercritical flow technology now make higher speeds possible without economic penalties. Boeing studies in the transonic speed regime indicate that a family of economically viable transonic airplanes can be developed.
The purpose of this paper is to identify some of the constraints imposed on an airplane propulsion system by transonic cruise speeds and to explore some ways to satisfy them. As the design Mach number of an airplane is increased above the 0.85 level toward 1.0, good airplane performance depends increasingly on careful tailoring of the propulsion installation and its integration into the overall configuration to establish a good compromise between drag, internal nacelle performance, and the practical considerations that produce an excellent airplane.

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