Modification to the Wraith oil retaining scheme and crankshaft EW 91Z.
| Identifier | ExFiles\Box 115\3\ scan0062 | |
| Date | 7th October 1937 | |
| ALTERATION TO CRANKSHAFT EW 91Z AS FOLLOWS:- 1 THE GROOVE AT THIS POINT IS DELETED AND: 2 THE 3 START ACME THREAD IS CONTINUED AS SHOWN. NEW END COVERS REQUIRED THE LOWER HALF TO HAVE 5 HOLES EQUALLY SPACED .187 DIA NOTE NO FELTS ARE FITTED WITH THIS SCHEME MODIFICATION TO WRAITH OIL RETAINING SCHEME ROLLS-ROYCE, LTD. PRINT ROOM OCT 7 1937 DERBY. RM. {William Robotham - Chief Engineer} 457 blH | ||
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).