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).
Test results for model crankshafts of different materials.
| Identifier | ExFiles\Box 63\4\ scan0121 | |
| Date | 19th May 1930 | |
| MODEL CRANK TESTS. Particulars of tests see Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}3/MJ13.3.30 and Hs{Lord Ernest Hives - Chair}/RM{William Robotham - Chief Engineer}3/MJ19.5.30. Dimensions of all crankshafts .295 Webs. Des. 995. Model of Des. 989. Conditions of all tests. Stroke 6" Flywheel R.P.M. 400 Flywheel Inertia 19.55 Lbs Ft² CRANK MATERIAL. S/ZN. Crank No. Total Time Run Reversals Average Flywheel R.P.M. 1 1 hr. 43 min. 80,340 390 2 43 min. 33,760 393 3 1 hr. 35 min. 75,100 395 4 46 min. 35,760 390 5 1 hr. 1 min. 48,580 398 CRANK MATERIAL. S/NCR. Brinell 280 approx. 3 51 min. 40,160 394 4 2 hrs. 21 min. 111,360 395 5 1 hr. 55 min. 91,420 398 | ||