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).
Piston profiles and wear measurements for 'Aerolite' standard Bentley pistons.
| Identifier | ExFiles\Box 124\1\ scan0027 | |
| Date | 23th February 1939 | |
| UNIT No BEN. 80; No 1. PISTON PROFILES PISTONS: 'AEROLITE'. IDENTIFICATION No STANDARD BENTLEY. PASSED TO TEST 9-12-38 COMPLETED TEST 23-2-39 RUNNING TIME 68 HRS MILEAGE (18 HRS 50 MINS F.T.) RELIEVED SECTION BEDDING SECTION PISTON No | RELIEVED SECTION | | | BEDDING SECTION | | | BEFORE | AFTER | WEAR | BEFORE | AFTER | WEAR 7. A-A | 3.4805 | 3.4812 | +.0007 | 3.4805 | 3.4812 | +.0007 B-B | 3.4805 | 3.4805 | NIL. | 3.4805 | 3.4805 | NIL. C-C | 3.4805 | 3.4805 | NIL. | 3.4805 | 3.4800 | .0005 D-D | 3.4810 | 3.4810 | NIL. | 3.4955 | 3.4952 | .0003 E-E | 3.4850 | 3.4845 | .0005 | 3.4995 | 3.5000 | +.0005 8. A-A | 3.4815 | 3.4820 | +.0005 | 3.4815 | 3.4820 | +.0005 B-B | 3.4815 | 3.4815 | NIL. | 3.4815 | 3.4815 | NIL. C-C | 3.4815 | 3.4815 | NIL. | 3.4815 | 3.4815 | NIL. D-D | 3.4815 | 3.4815 | NIL. | 3.4955 | 3.4952 | .0003 E-E | 3.4860 | 3.4865 | +.0005 | 3.4990 | 3.5000 | +.0010 3 | A-A B-B C-C D-D E-E 4 | A-A B-B C-C D-D E-E 5 | A-A B-B C-C D-D E-E 6 | A-A B-B C-C D-D E-E | ||