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).
Main dimensions of a B.80 crank-throw.
| Identifier | ExFiles\Box 124\1\ scan0083 | |
| Date | 21th April 1939 | |
| MAIN DIMENSIONS OF B.80 CRANK - THROW B.80 Nᵒ 2 TO E.B. 4104 B.80 Nᵒ 3 TO EX. 33947 1.375 1.125 DIA. 1.998 DIA. 1.500 RAD. 3.9375 RAD. 1.629 RAD. .500 DIA. .650 2.498 DIA B.80 Nᵒ 2 2.750 DIA B.80 Nᵒ 3 J.R.S. 21.4.39 | ||