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).
The approximate clutch horse-powers for the P.11. Continental, P.11. Standard, and 20/25 HP chassis.
| Identifier | ExFiles\Box 27\2\ Scan021 | |
| Date | 18th March 1933 | |
| (Showrooms). To Sr. From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} V1775 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/MJ.18.3.33. With reference to your memo. SR22/MLG.16.3.33., the approximate horse-powers for the three chassis you mention are:- 160 P.11. Continental. 120 P.11. Standard. 78 20/25 HP. The figures given are clutch horse-powers, running open exhaust. It should be remembered that we are always improving the breed and therefore these horse-powers are constantly being increased. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||