Further Notes on the Design of Wing Spar Sections
About a year and a half ago, the writer published an article* in which he outlined a simple method of approximating to the sectional area required for a wing spar of known depth and subjected to known bending moment and compression. In a subsequent issue of AVIATION †, Dr. A. J. Sutton Pippard and F. E. Seiler, Jr. took mild exception to certain phases of the method, the former complaining of the omission of any allowance for the effect of buckling of the spar, the latter objecting to the neglect of the form factor in selecting the allowable bending stress to be used in an illustrative example.
By EDWARD P. WARNER10 min