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 profile wear measurements for six 'Aerolite' high crown pistons following a timed test.
| Identifier | ExFiles\Box 123\5\ scan0338 | |
| Date | 15th February 1939 | |
| UNIT No B.60 No.1 PASSED TO TEST 11-1-39. COMPLETED TEST 15-2-39 RUNNING TIME 74 HRS. 10 MINS. MILEAGE 55 HRS. 15 MINS F.T. PISTON PROFILES PISTONS AEROLITE IDENTIFICATION No HC. 'HIGH CROWN' RELIEVED SECTION BEDDING SECTION PISTON No, RELIEVED SECTION, BEDDING SECTION , BEFORE, AFTER, WEAR, BEFORE, AFTER, WEAR 1 A-A, 3.4815, 3.4830, +.0015, 3.4815, 3.4825, +.0010 B-B, 3.4812, 3.4818, +.0006, 3.4812, 3.4812, NIL. C-C, 3.4810, 3.4812, +.0002, 3.4812, 3.4806, .0006 D-D, 3.4820, 3.4815, .0005, 3.4959, 3.4950, .0009 E-E, 3.4865, 3.4842, .0023, 3.5001, 3.5008, +.0007 2 A-A, 3.4813, 3.4815, +.0002, 3.4812, 3.4815, +.0003 B-B, 3.4810, 3.4808, .0002, 3.4810, 3.4810, NIL. C-C, 3.4801, 3.4802, +.0001, 3.4810, 3.4802, .0008 D-D, 3.4818, 3.4810, .0008, 3.4956, 3.4954, .0002 E-E, 3.4857, 3.4890, .0017, 3.5001, 3.5001, NIL. 3 A-A, 3.4808, 3.4812, +.0004, 3.4808, 3.4810, +.0002 B-B, 3.4808, 3.4810, +.0002, 3.4804, 3.4802, .0002 C-C, 3.4803, 3.4807, .0002, 3.4804, 3.4805, .0001 D-D, 3.4821, 3.4820, .0001, 3.4959, 3.4955, .0004 E-E, 3.4871, 3.4850, .0021, 3.4998, 3.5005, +.0007 4 A-A, 3.4810, 3.4812, +.0002, 3.4809, 3.4812, +.0003 B-B, 3.4808, 3.4805, .0003, 3.48075, 3.4802, .00055 C-C, 3.4794, 3.4792, .0002, 3.4805, 3.4800, .0005 D-D, 3.4819, 3.4812, .0007, 3.4958, 3.4955, .0003 E-E, 3.4850, 3.4830, .0020, 3.5008, 3.5018, +.0010 5 A-A, 3.4810, 3.4815, +.0005, 3.4810, 3.4818, +.0008 B-B, 3.4803, 3.4810, +.0001, 3.4808, 3.4808, NIL. C-C, 3.48025, 3.4805, +.00025, 3.4808, 3.4802, .0006 D-D, 3.4818, 3.4810, .0008, 3.4959, 3.4955, .0004 E-E, 3.4862, 3.4850, .0012, 3.5000, 3.5015, +.0015 6 A-A, 3.4812, 3.4818, +.0006, 3.4812, 3.4820, +.0008 B-B, 3.4805, 3.4810, +.0005, 3.4810, 3.4806, .0004 C-C, 3.4804, 3.4804, NIL., 3.4810, 3.4800, .0010 D-D, 3.48175, 3.4812, .00055, 3.4855, 3.4950, .0005 E-E, 3.4852, 3.4832, .0020, 3.5000, 3.5005, +.0005 | ||