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 the effect of brake distribution and road surface variation on vehicle stopping distance.
| Identifier | ExFiles\Box 178\1\ img078 | |
| Date | 9th July 1924 guessed | |
| TOP GRAPH: ROAD SPEED M.P.H. CURVE 'A' CURVE 'B' CURVE 'C' 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. DISTANCE TO REST FT. BOTTOM GRAPH: ROAD SPEED M.P.H. μ = 1. μ = .7 μ = .5 μ = .2 EFFECT OF ROAD SURFACE VARIATION. CAR ALL WHEELS LOCKED μ IS COEFFICIENT OF FRICTION BETWEEN TYRE & ROAD SURFACE. | ||