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 made from Nitro Alloy steel.
| Identifier | ExFiles\Box 63\4\ scan0123 | |
| Date | 18th August 1930 | |
| X4499 To Rg.{Mr Rowledge} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}5/AD18.8.30. MODEL CRANK TESTS. We have now completed the tests on the model cranks make in Nitro Alloy steel with the following results :- Des. 995. Model of Des. 989 .295 Webs. Flywheel R.P.M. 400. Stroke 6.0" Moment of inertia of flywheel 19.55 lbs Ft2 Material S/AL. Crank No. Time Run. Total Reversals. 1 1 hr. 40 min. 79,200 2 3 hrs. 14 min. 154,120 3 4 hrs. 34 min. 218,220 4 3 hrs. 40 min. 174,860 It will be observed that these shafts have given better results than those in any other material. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||