Chart tracking engine failures for 3 1/2 and 4 1/4 litre Bentley models.
| Identifier | ExFiles\Box 131\3\ scan0110 | |
| Date | 30th June 1939 guessed | |
| CHART OF ENGINE FAILURES 3 1/2 AND 4 1/4 BENTLEY 1939 OWNERS NAME WHERE FAILED E = ENGLAND A = ABROAD JAN FEB MARCH APRIL MAY JUNE NATURE OF FAILURE (1) CRANKCASE BROKEN DUE TO FAILURE OF CONNECTING ROD. M = MILEAGE (2) NATURE OF FAILURE Nº2 EXHAUST VALVE HEAD BROKEN. PISTON BROKEN. (2) E ENGLAND A ABROAD E SIR JAMES HERON(Experimental 6 CYL OHV 40/50 WITH PNEUMATIC F.W.B. air pump on camshaft, then Servo) WALKER BT. {Capt. J. S. Burt - Engineer} GWH {George W. Hancock - Head Chateauroux} 2 | ||
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).