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).
List of design updates and issued drawings for the Merlin 'B' and 'C' aero engines.
| Identifier | ExFiles\Box 30\3\ Scan200 | |
| Date | 12th June 1935 | |
| - 6 - "MERLIN C" AERO ENGINE. DES. 2471 Tooth Forms. S/C. Drive. First Gear Train. ............ Recd. 17.5.35. Detail drawings completed and issued ................. 1.6.35. DES. 2474 Crankcase. Larger Oil Drain Holes through Front Wall ............................... Recd. 15.5.35. Drawing alteration issued .................... 13.5.35. DES. 2476 Generator Oil Pump with Relief Valve ................ Recd. 16.5.35. Detail drawings completed and issued .................... 17.5.35. DES. 2477 Strengthened Supercharger Gears .................... Recd. 17.5.35. Detail drawings completed and issued ................. 1.6.35. DES. 2479 Relief Valve (Generator Pump) ..................... Recd. 17.5.35. Detail drawings completed and issued ..................... 21.5.35. DES. 2480 Modfn. to Lower Bearing - Upper Vertical Drive. Recd. 17.5.35. Detail drawings completed and issued ..................... 20.5.35. DES. 2481 Modified Bracket for Idler Gear. (Oil Pump Drive).Recd.18.5.35. Detail drawings completed and issued ................... 22.5.35. DES. 2482 Camshaft Bearing Bolts ............................ Recd. 20.5.35. Drawing alteration issued .................... 21.5.35. DES. 2484 Wheelcase Modification (To suit Idler Gear Brkt.)Recd. 22.5.35. Detail drawings completed and issued ................. 23.5.35. DES. 2485 Modfn. to Upper Vertical Drive .................... Recd. 22.5.35. Detail drawings completed and issued ................. 23.5.35. DES. 2486 Modfn. to Lower Half Crankcase .................... Recd. 23.5.35. Drawing alteration issued .................... 25.5.35. LeC. 4505 Inlet & Exhaust Valve Lift Curve ............ Recd. 22.5.35. Detail drawings completed and issued ................. 23.5.35. LeC. 4508 Valve Springs .................................. Recd. 24.5.35. Detail drawings completed and issued ................. 28.5.35. MERLIN 'B' AND 'C' AERO ENGINES. DES. 2391 Piston (6 to 1 Compression Ratio) ................ Recd. 20.3.35. Detail drawings completed and issued ................. 29.3.35. | ||