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).
Stating the brake horse-power of the 25/30 car with an open exhaust.
| Identifier | ExFiles\Box 146\2\ scan0277 | |
| Date | 6th July 1937 | |
| W/P. Sr/EWP.{Mr Punt} 1243 Rm{William Robotham - Chief Engineer}3/R.6.7.37. 25/30 H.P. Replying to Sr/EWP{Mr Punt}23/MLG.1.7.37., the brake horse-power of the 25/30 car open exhaust is 105. Rm.{William Robotham - Chief Engineer} | ||