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).
Calculations for loads, stresses, and bending moments on unclipped and clipped plates with associated diagrams.
| Identifier | ExFiles\Box 43\2\ Scan202 | |
| Date | 28th September 1937 guessed | |
| - 7 - Or, more conveniently one can take loads and stresses at ½" neg. given in above table and increase the load in the required proportion, thus:- Unclipped. [Diagram shows a beam with a central upward force of 1116 Lbs. and two downward forces at the ends: 578 Lbs. on the left and 538 Lbs. on the right. The distance from the left force to the center is 21", and from the center to the right force is 22½".] Clipped. (same stresses in plates). [Diagram shows a beam with a central upward force of 1184 Lbs. and two downward forces at the ends: 615 Lbs. on the left and 569 Lbs. on the right. The distance from the left force to the center is 19.750, and from the center to the right force is 21.250.] (It was at this point that we realized that all the calculations should really have been made with say 2½" at the centre bolt assumed dead. Some later calculation has been done in the latter way). Main plate. stress ½" neg = 27150 lbs/in² Modulus = .027 Bending moment = f x bt{Capt. J. S. Burt - Engineer}²/6 = 733 lbs. ins. Divide by 615 lbs. Overhang of main plate should be 733/615 = 1.190 ins. Second plate.stress = 55,300 lbs/in² Modulus = .0203" Bending moment = 1150 lbs.ins. Divide by 615 Overhang = 1150/615 = 1.870" | ||