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).
The tensile tests conducted on model Eagle engine cranks.
| Identifier | ExFiles\Box 42\2\ Scan054 | |
| Date | 11th November 1919 | |
| R.H. 235a (500 T) (S.D. 408. 28-4-17.) Bm. 2/158/13. X.3289. K.{Mr Kilner} from BY/Btn. e.{Mr Elliott - Chief Engineer} ES. (struck through) C. EB. (struck through) C. DB.{Donald Bastow - Suspensions} (struck through) c. CK.{Mr Clark} BY/Btnl/P1.11.19. RE TESTS ON MODEL EAGLE CRANKS. Referring to our memo BY3/P23819, the tests on the model cranks as outlined in scheme No.291, have not been carried out. You will recollect that our original intention was to have these tests made at the Nottingham University, but owing to this institution being closed at the time the cranks were ready, and a torsion attachment having been ordered for our Buckton Testing machine it was thought advisable to hold these tests over till we could carry them out ourselves. The models were made of the exact proportions of the Eagle crank journals and webs as these existed at the time and reduced in scale in the ratio of 3.6 to 1. They were made from a bar of crankshaft steel 2" x 4" x 3'6" long, which was supplied to us specially by Vickers. Tensile tests were taken, of which the average result was as under:- Elastic Limit. Ultimate. Elongation. Red.of Area. 69 tons. 72 tons. 18% 49% corresponding to a brinell of 321. Two forms of test pieces were used which were held as shown on Scheme 291, and fractured as under. contd. | ||