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).
Braking performance data table for a four-wheel brake system on an open touring car.
| Identifier | ExFiles\Box 113\2\ scan0074 | |
| Date | 24th March 1925 | |
| FOUR WHEEL BRAKES. OPEN TOURING CAR. 24.3.25. Wt. ratio Front .95 Rear 1.025 TABLE DATA: Column Headers: M.P.H., ALL WHEELS LOCK (Distance., Time.), 40% BRAKING ON THE FRONT (Distance., Time.), REAR BRAKES ONLY (Distance., Time.) Row M.P.H. 10: 4.8 ft., .625 secs, 7 ft., .96 secs, 10.75 ft., 1.46 secs. Row M.P.H. 20: 19.2 ", 1.25 ", 28 ", 1.92 ", 42 ", 2.9 " Row M.P.H. 30: 43.2 ", 1.875 ", 63 ", 2.88 ", 96 ", 4.4 " Row M.P.H. 40: 77 ", 2.5 ", 112 ", 3.84 ", 168 ", 5.8 " Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||