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).
Specification sheet comparing connecting rod and crank dimensions for Condor, 40/50 HP, and Goshawk engines.
| Identifier | ExFiles\Box 74\3\ scan0281 | |
| Date | 19th July 1923 | |
| X.4221 19.7.23. CONDOR. Con rod 13" X.4416 Crank 3.75" X.3208 Con Rod/Crank 3.47 40/50 HP. Con Rod 9.9" X.3429 Crank 2.375" X.3432 Con Rod/Crank 4.17 GOSHAWK. Con Rod 7.95" X.4228 Crank 2.25" X.4221 Con Rod/Crank 3.53 Rm.{William Robotham - Chief Engineer} | ||