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).
Bump tests for the 40/50 chassis, detailing the performance of new wheels, shock absorbers, and a radiator.
| Identifier | ExFiles\Box 119\2\ scan0080 | |
| Date | 27th November 1919 | |
| R.{Sir Henry Royce} from EH. R.R. 235 A/100 C. (S F to. O.L) G 2354 c. to BN.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} X.1331. EH2/LG27.11.19. X.1331. BUMP TEST ON 40/50 CHASSIS. We have carried out further bump tests on the front of the 40/50 chassis. On these tests we have used the 2" bumps instead of the 3". You will remember that on the last bump test we completely wrecked the chassis after 10 hours running with the 3" bumps. We consider that breaking the parts in such a short time made the test less reliable for comparisons and did not reproduce in any way the shocks the car gets on the road. We find that with the 2" bumps we get the same pieces breaking except that it takes a longer time. The new parts which we were running on this last test were:- 1. Michelin Disc Wheels. X.3482 ✓ On one front hub, we had the standard Michelin stud; on the other side we had the R-R stud. We had to use a Michelin type nut with the R.R. type studs because the wheels would not stand being altered from a radius to a chamfer. After every 25 hours running we changed the wheels. We took no special care in fitting on these wheels. The wheels have run on the bump test now, 126 hours. We have had no trouble with them working loose or shewing any signs of distress. We cannot appreciate or notice any advantage in one design of stud over the other. 2. Front Shock Absorbers with improved link and ball end fixed to the Axle. X.3461A ✓ These have run for 126 hours; we have had no trouble. During the run they have been adjusted once. We have examined all the parts and they are in excellent condition. 3. Orme Evans Radiator. X.3456 ✓ X.1754 ✓ This radiator is similar to the Marston. The object of trying the Orme Evans Radiator was to widen the market for Radiators. The Radiator has run 126 hours on this test. Attached herewith is a list of parts which failed during Contd. | ||