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).
Specification table for 20HP Crankshafts, detailing drawing numbers, dimensions, and design notes.
| Identifier | ExFiles\Box 6\1\ 01-page117 | |
| Date | 19th April 1928 guessed | |
| X5010 20HP Crankshafts. Drawing No. | Shape of Web. | Dia: of Journal. | Dia: of C'pin. | Front End Spring Drive. | Rear End Thrust. | Remarks. E.54064. | Parallel. | 2.000 | 1.500 | Std:Prod: | Std:Prod: | Std:Prod: on "L" Series E.54601. | 3.000 Oval. | 2.125 | 1.500 | New design Lec.2457. | New design Lec.2480. | No oil caps in Crankpin. E.54640. | 3.000 Oval. | 2.125 | 1.500 | Std:Prod: | Std:Prod: | No oil caps in Crankpin. E.54643. | 3.250 Oval. | 2.125 | 1.750 | Std:Prod: | New design Lec.2480. | Tubular Conn: Rods. E.54700. | 3.250 Oval. | 2.125 | 1.750 | New design. Lec.2457. | New design Lec.2480. | Tubular Conn: Rods. E.54701. | 3.000 Oval. | 2.000 | 1.500 | Std:Prod: | Std:Prod: | Std:Prod: on "M" Series. [Vertically stamped text on right edge tab]: SERVICE ALTERNATIVES | ||