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).
Weight comparison of connecting rods for RR.56, Bentley, and 20/25 models.
| Identifier | ExFiles\Box 85\3\ scan0061 | |
| Date | 9th October 1933 | |
| WEIGHT OF RR.56. CONN. RODS AS COMPARED WITH BENTLEY 20/25 HP. WEIGHT OF BIG END WITH ROD SUSPENDED AT 'B' SMALL END AT 'A' SECTION OF STEM .750 .125R .650 DIA 0.950 1.150 BENTLEY - E556089 WEIGHT OF BIG END: 1.328 LBS WEIGHT OF SMALL END: .375 LBS TOTAL WEIGHT = 1.703 LBS. 20/25 ROD. MODIFIED TYPE. Ex11746. Lec. 355D WEIGHT OF BIG END: 1.319 LBS. WEIGHT OF SMALL END: .406 LBS. TOTAL WEIGHT = 1.725 LBS. RR.56. ROD. TO Ex12386 WEIGHT OF BIG END: .848 LBS. WEIGHT OF SMALL END: .372 LBS. TOTAL WEIGHT: 1.220 LBS REDUCTION IN WEIGHT OF RR56. CONN. RODS AS COMPARED WITH | | 20/25 | BENTLEY | |---|---|---| | BIG END | .471 LBS. | .480 LBS | | SMALL END | .034 LBS. | .003 LBS | | TOTAL WEIGHT | .505 LBS. | .483 LBS. | ROLLS-ROYCE, LTD PRINT ROOM OCT 10 1933 DERBY | ||