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).
Horsepower figures for a 40/50 HP engine with various exhaust pipe configurations.
| Identifier | ExFiles\Box 38\4\ Scan062 | |
| Date | 1st April 1924 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} Wor.{Arthur Wormald - General Works Manager} X3436 40/50 H.P. X3056 (crossed out) X3436 HS{Lord Ernest Hives - Chair}5/LG1.4.24. We attach sheet giving H.P. figures taken on a 40/50 HP. engine with the present standard scheme of exhaust pipes, with the pipes arranged to LeC.1832/3, and with the Derby exhaust scheme which we are at present running on the cars. It will be seen that there is comparatively little loss with this scheme shewn on LeC.1832/3. We are, however, trying this scheme with a larger down-pipe. We found that the larger down-pipe decreases the loss with the Derby scheme. Hs.{Lord Ernest Hives - Chair} | ||