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This paper discusses the creation of the aerodynamic analysis module of a PC-based aircraft design program called “RDS”, using the time-honored aerodynamic methods found in classical textbooks and the USAF DATCOM. Using this program, reasonably realistic aerodynamic results can be calculated in less than an hour given the geometric inputs which define an aircraft, such as component wetted areas, wing geometry, and cross-section areas. Aerodynamics analysis in RDS includes parasite drag (subsonic and supersonic), drag due to lift, lift curve slope, and maximum lift. Comparisons to T-38 data show good results.

RDS-Professional is a conceptual aircraft design and analysis system developed for operation on a personal computer. Based on the methods in the AIAA textbook ‘Aircraft Design: A Conceptual Approach’, RDS features a 3-D CAD module for design layout, and has analysis modules for aerodynamics, weights, propulsion, and cost. RDS includes capabilities for aircraft sizing, mission analysis, and performance analysis including takeoff, landing, rate of climb, Ps, fs, turn rate, and acceleration. RDS also provides graphical output for drag polars, L/D ratio, thrust curves, flight envelope, and range parameter, and features both traditional carpet plot optimization and a multivariable design optimizer. Comparative studies indicate that RDS-Professional produces results within the usual accuracy for conceptual design efforts.