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).
Response to a query regarding the braking distances of a 20/25 model car.
| Identifier | ExFiles\Box 107\3\ scan0024 | |
| Date | 15th April 1935 | |
| W/S - C. x561 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/KW.15.4.35. Replying to C.13/C.12.4.35. This is a highly controversial question and is as difficult to answer as the query - "How fast will a Rolls-Royce car go". We should say that under no conditions can a 20/25 Rolls pull up in less than 30 ft. from 30 m.p.h. and 120 ft. from 60 m.p.h. A very good average stop, which would certainly be inclined to throw the rear passengers off the seat, would be 54 ft. from 30 m.p.h. and 216 ft. from 60 m.p.h. To pull the car up in less than 54 ft. from 30 m.p.h. means that the distribution of the load in the car, or the surface of the road must be exceptional. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||