Effect of C. A. R. Performance Requirements on Airplane Design

A SYSTEM of plots of wing loading versus power loading is developed for showing the effect on performance, of all combinations of wing area, aspect ratio, number of engines, and power rating allowed by the Civil Air Regulations for transport planes. C.A.R. climb requirements appear on the plots as boundaries defining allowable combinations of design variables and gross weight.

The charts included give a fairly detailed consideration of weight limits imposed by climb requirements for 4-engine and 2-engine airplanes. The assumptions made are explained. Useful for initial design studies and comparisons of existing designs, the charts indicate relative performance of various designs.

The system can be used to study field lengths required and cruising speeds obtainable as well as climb performance.