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).
Comparison of acceleration performance and weight for car models 18-GIV and 14-GIV.
| Identifier | ExFiles\Box 113\2\ scan0176 | |
| Date | 21th November 1931 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. D.B. EV.{Ivan Evernden - coachwork} X 1725. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}S/AD21.11.31. ACCELERATION 10,000 MILES CAR. During the trial of 18-GIV prior to its going to France, there was some criticism that its low speed performance was poor compared with the best available trials car. Below are the standard acceleration figures taken by C.W.H. on this car in France compared with similar figures taken on 14-GIV, a standard high compression 20/25 weighing slightly less than 18-GIV :- Time in Secs. 18-GIV 14-GIV 10 - 20 5.2 5.5 20 - 30 5.2 6 30 - 40 5.4 7 40 - 50 8 9 50 - 60 9.3 16 60 - 70 16.9 20 Top gear 4.545 4.55 ratio. hypoid. 14-GIV Car weight 33 cwt. 3 qrs. 7 lbs. 18-GIV " " 36 cwt. 0 qrs. 0 lbs. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||