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).
Comparing wear and performance data for different thrust bearing designs.
| Identifier | ExFiles\Box 20\7\ Scan116 | |
| Date | 12th June 1925 | |
| R.R. 499a (50 B) (D.D. 21. 12-6-25) J.H.D. EXPERIMENTAL REPORT. -2- Expl. No. REF: After the baove tests the bearing was found to be in good condition but the float had increased to .003. This figure represents actual wear in the bearing. These tests prove this bearing to be far superior to the others and a bearing of this type was fitted to the rear axle on chassis 9-G-111 (10,000miles). Below we give the figures for the various tests :- STANDARD TYPE OF THRUST. Table Headers: Test No., No. of balls in each row., Dia. of Balls., Conditions., Speed of rig. revs., Effect-ive load., Time run., Remarks. Test 1: 12, 5/16, Direct Drive., 2000, 1000 lbs., 20 hrs., All balls badly scored. 2 chipped. Test 2: 12, 5/16, 2nd. speed., 1220, 2500 lbs., 10 hrs., Balls scored 1 chipped badly. also races scored. NEW DEPARTURE. Test 3: 14, 5/16, 2nd. speed., 1220, 2500 lbs., 10 hrs., 3 balls badly chipped. NEW DEPARTURE NO. 306. Test 4: 9, 7/16, Direct Drive., 2000, 1000 lbs., 20 hrs, Float increased .001. Test 5: 9, 7/16, 2nd. speed, 1220, 2500 lbs., 10 hrs., Float .001 Test 6: 9, 7/16, 1st. speed., 700, 4300, 10 hrs, Float .0015. Test 7: 9, 7/16, Reverse., 525, 5800, 10, .003. HIC. | ||