1 For details of the basis on which these have been decided, see Appendix I. and II.
2 On the Junkers J.13 the covering, including longitudinal stiffening strips, weighs between 0.7 and 0.4 lbs. per sq. ft. of double surface.
3 So far as the wings are concerned. Its effect on the tail and fuselage structure remains unchanged.
4 Two cases are dealt with, one corresponding to a wing section with a large moment coefficient (—0.05) and the other to a section such as R.A.F.15 (— 0.015). In both cases the spars are taken to be at 0.15 and 0.65 chord, and the rigidity of the front and rear lift girders is taken to be the same.