From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Page of calculations for various engineering variables, including stress.
| Identifier | ExFiles\Box 52\1\ Scan184 | |
| Date | 31th January 1929 guessed | |
| -2- Contd. We now have d = .048" D = .323" W = 10.00 lbw L = 4.750" δ = 1.750" R = W/δ = 5.71 lbw/inch We have n = (Cd^4) / (8D^3 R) = (12 x 10^6 x (.048)^4) / (8 x (.323)^3 x 5.71) = ((.48)^3 x 72) / ((.323)^3 x 5.71) = 41.3 i.e. 41 nearly (n+1)d = 42 x .048 = 2.020" Stress f = (C d δ) / (π D^2 n) = (12x10^6x .048 x 1.750) / (π x (.323)^2 x 41) = 75000 lbs/sq." | ||