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).
Despatch instructions for two sets of experimental pistons, P.451 (Aerolite) and P.461 (Split skirt).
| Identifier | ExFiles\Box 146\5\ scan0182 | |
| Date | 26th June 1939 | |
| W/P - Sr. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}10/JH.26.6.39. In accordance with Rm{William Robotham - Chief Engineer}'s. instructions we are despatching for your attention, two sets of experimental pistons as follows :- 6 off P.451 (Aerolite). These pistons will raise the compression by one ratio on a Bentley or Wraith. 6 off P.461. (Split skirt). These pistons will raise the compression by half one ratio on a Bentley or a Wraith. Note. Will you please let us have unit and chassis numbers, and customers names of cars to which you have fitted special pistons to date, complete with data of the pistons fitted. This is simply for record purposes, in case we wish to get in touch with the various pistons at a later date. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||