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).
Polar diagram showing the big end loadings for a 4 1/4 Litre Bentley engine.
| Identifier | ExFiles\Box 83\3\ scan0094 | |
| Date | 7th May 1937 | |
| MAX. CYLINDER PRESSURE TAKEN AS 700 lbs/□" CURRENT PRODN PIECES WITH A/C BIG END BUSH TOTAL ROTATING WT. 1.140 lb TOTAL RECIPROCATING WT. 2.000 lb CONN. ROD CENTRES 7.950" BIG END AREA 2.32 □" ANGULAR POSN OF CRANK FROM T.D.C. INERTIA LDGS. ONLY AT 4500 RPM 4 1/4 L. BENTLEY - BIG END LOADINGS COMBINED GAS & INERTIA LDGS. AT 4500 RPM MAXM LOADING 2060 lbs/□" C OF ROD ROD GAP lbs/SQ.IN ROLLS-ROYCE, LTD. PRINT ROOM, 7 MAY 1937 DERBY. RM{William Robotham - Chief Engineer} 364 F.U.S.H 23.IV.37 | ||