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).
Acceleration test results for a 10x41 Axle with cut out closed.
| Identifier | ExFiles\Box 82\1\ scan0208 | |
| Date | 18th August 1933 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From G.W.H. Hotel de France. Chateauroux. Indre. 18.8.33. I.B.IV. 10x41 AXLE ACCELERATION TESTS WITH CUT OUT CLOSED (Average) Top Gear MPH SEC MPH SEC 10 - 20 4.35 10 - 20 4.45 10 - 30 8.65 20 - 30 4.5 10 - 40 12.6 30 - 40 4.25 10 - 50 17. 40 - 50 4.85 10 - 60 22.95 50 - 60 5.2 10 - 70 30.4 60?- 70 6.8 10 - 80 41.4 70 - 80 12.45 3rd Gear MPH SEC 10 - 20 3.65 10 - 30 6.45 10 - 40 10. 10 - 50 13.8 10 - 60 18.75 10 - 70 24.3 Standing start through gears to 80 M.P.H. 35.5 sec. STANDARD PETROL; RRZ NEEDLES; PETROL TANK 3/4 FULL; ONE DRIVER & PASSENGER | ||