Vehicle performance, speedometer accuracy, and comparing the wheel torque of U series and R series cars.
| Identifier | ExFiles\Box 107\1\ scan0119 | |
| Date | 15th June 1932 | |
| Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} 1/KT.15.6.32. Cont'd. {John DeLooze - Company Secretary} -2- being so, we should agree with Mr.Hopps that unless conditions were favourable, it would require a good stretch to reach 70 m.p.h. However, we are not certain that the speedometer of this car does not read low. We asked you to check it when we handed the car over, which doubtless you have done. In consideration of the weight of 20 G.IV. and the fact that your demonstration work is largely done in traffic, we recommend that the axle is changed to standard, i.e. 11/50. This will improve the low speed acceleration 3% and should not drop the maximum speed by more than 2 m.p.h. A demonstration with the cars at the same weight should then impress Mr.Hopps. Hs {Lord Ernest Hives - Chair} /Rm. {William Robotham - Chief Engineer} [Table] Improved wheel torque of U series over R series. 10 M.P.H. - 3% 20 M.P.H. + 1% 30 M.P.H. +4% 40 M.P.H. + 3% 50 M.P.H. - 14% 60 M.P.H. + 25% At low speeds acceleration proportional to torque available, also wt. i.e. A "R" series car weighing 3% less than a "U" series car will have superior acceleration up to 40 m.p.h. | ||
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).