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).
Graph showing the efficiency of direct braking from the pedal to the front brakes for the Spectre model.
| Identifier | ExFiles\Box 92\4\ scan0023 | |
| Date | 29th October 1934 guessed | |
| SPECTRECodename for Phantom III - EFFICIENCY OF DIRECT BRAKING FROM PEDAL TO FRONT BRAKES EFFICIENCY PEDAL EFFORT LBS LOAD AT BRAKE CAM. - LBS AT 14" RADIUS EXCLUDING EQUALISER TO BOTH CAMS INCLUDING EQUALISER TO ONE CAM ONLY | ||