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 detailing the dimensions and wear of main bearings and a crankshaft following a 68-hour running test.
| Identifier | ExFiles\Box 124\1\ scan0018 | |
| Date | 23th February 1939 | |
| MAIN BEARINGS DIMENSIONS UNIT Nọ BEN. 80. Nọ1. PASSED TO TEST :- 9-12-38 COMPLETED TEST :- 23 2 39 RUNNING TIME :- 68 HRS. MILEAGE :- --- (18HRS. 50MINS F.T.) CRANKSHAFT: EB.4104 MATL: 4461/1 CAB. TEST PIECE Nọ: MAIN BEARINGS: VANDERVELL. MATL: STRIP S/W/MT. TABLE DATA: | | BEARINGS | C/SHAFT | CLEARANCE | | | BEFORE | AFTER | WEAR | BEFORE | AFTER | WEAR | BEFORE | AFTER | WEAR | | 1 | | | | | | | | | | | A-A | 2.4990 | | | 2.4970 | | | .0020 | | | | B-B | 2.4994 | | | 2.4965 | | | .0029 | | | | OVALITY | .0004 | | | .0005 | | | | | | | 2 | | | | | | | | | | | A-A | 2.4995 | | | 2.4970 | | | .0030 | | | | B-B | 2.4990 | | | 2.4965 | | | .0020 | | | | OVALITY | .0005 | | | .0005 | | | | | | | 3 | | | | | | | | | | | A-A | 2.4990 | | | 2.4970 | | | .0025 | | | | B-B | 2.4985 | | | 2.4965 | | | .0020 | | | | OVALITY | .0005 | | | .0005 | | | | | | | 4 | | | | | | | | | | | A-A | 2.4995 | | | 2.4970 | | | .0033 | | | | B-B | 2.4998 | | | 2.4965 | | | .0028 | | | | OVALITY | .0003 | | | .0005 | | | | | | | 5 | | | | | | | | | | | A-A | 2.4996 | | | 2.4970 | | | .0033 | | | | B-B | 2.4998 | | | 2.4965 | | | .0026 | | | | OVALITY | .0002 | | | .0005 | | | | | | | 6 | | | | | | | | | | | A-A | 2.4996 | | | 2.4970 | | | .0031 | | | | B-B | 2.4996 | | | 2.4965 | | | .0026 | | | | OVALITY | NIL | | | .0005 | | | | | | | 7 | | | | | | | | | | | A-A | 2.4996 | | | 2.4970 | | | .0031 | | | | B-B | 2.4994 | | | 2.4965 | | | .0024 | | | | OVALITY | .0002 | | | .0005 | | | | | | MAX. & MIN. CLEARANCES GIVEN. GAUGE SIZE: | ||