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 report on a Bentley III Bumper Chassis detailing failures and recommended modifications during a 50-hour test.
| Identifier | ExFiles\Box 119\1\ scan0107 | |
| Date | 14th May 1938 | |
| Rm{William Robotham - Chief Engineer}/FWK.1/MH.{M. Huckerby}14.5.38. BENTLEY III BUMPER CHASSIS. 50 HOURS TEST ON REAR END WITH 3" CAMS. During the above test the following failures occurred:- 1. Bijur pipes for lubrication of rear springs after 45 mins. 2. N.S. rear spring - leaves 3, 4 and 5 after 12.00 hrs. 3. O.S. rear spring - leaf 3, after 15 1/4 hrs. 4. Damper brackets after 25.15 hrs. FB.3504. 5. O.S. rear spring - leaf 2, after 18.45 hrs. 6. N.S. rear spring - main leaf after 20.15 hrs. 7. O.S. Damper - No load after 24.00 hrs. We recommend the following modifications:- The coil in the pipe line was located too far from the front eye of the spring. This was altered so that the coil and spring pivot were on the same C and no trouble was experienced. Better than B.II. Better than B.II. The brackets were being hit by the damper arms. The former were modified to provide the necessary clearance and proved satisfactory. This scheme is obsolete. Better than B.II. Better than B.II. The first damper failure was due to a sticking main valve. This was probably due to iron or aluminium dust being present in the oil. An experiment will probably be tried with tin plated pistons or alternatively some different damper fluid in an attempt to eliminate the trouble. | ||