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).
Two graphs illustrating theoretical braking curves, showing the effects of brake distribution and road surface friction.
| Identifier | ExFiles\Box 160\2\ scan0065 | |
| Date | 17th October 1925 guessed | |
| THEORETICAL BRAKING CURVES Graph 1: EFFECT OF BRAKE DISTRIBUTION. OPEN TOURING CAR. WHEELBASE LENGTH 150" HT. OF C. OF G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 26" COEFF. OF FRN. BETWEEN TYRE & ROAD .7 WTS. FRONT 1.05 TONS, REAR 1.10 TONS. CURVE 'A' ALL FOUR WHEELS CAN BE LOCKED. CURVE 'B' REAR WHEELS ONLY LOCKED (FRONT BRAKING 40%) CURVE 'C' NO FRONT BRAKING, REAR WHEELS LOCKED. Y-Axis: ROAD SPEED M.P.H. X-Axis: DISTANCE TO REST FT. Graph 2: EFFECT OF ROAD SURFACE VARIATION. CAR ALL WHEELS LOCKED. μ IS COEFFICIENT OF FRICTION BETWEEN TYRE & ROAD SURFACE. Curve labels: μ = 1., μ = .7, μ = .5, μ = .2 Y-Axis: ROAD SPEED M.P.H. X-Axis: DISTANCE TO REST FT. | ||