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).
Table detailing the dimensions of Down Pipes and Fish Tail Pipes for 40/50 HP and 20 HP models.
| Identifier | ExFiles\Box 181\M13\M13.2\ img048 | |
| Date | 9th May 1931 | |
| - 2 - Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/CT.9.5.31.contd. | | 40/50 HP. | 20 HP. | |---|---|---| | Down Pipe | 2.750. | 1.625. | | Fish Tail Pipe | 1.812. | 1.375 | | Fish Tail Area | 2.25 sq". | 1.5 sq". | All figures inside diameters. 20 HP. Arrgt. E.55794. 40/50. E.82070. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||