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).
Brooklands test results comparing acceleration and maximum speed for three different car configurations.
| Identifier | Morton\M9\ img017 | |
| Date | 23th June 1931 | |
| ORIGINAL To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to SG.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Rn.{Mr Robinson} c. to Ey. PH. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}1/KT. 23.6.31. 8788. 8577'. BROOKLANDS TESTS. 19.6.31. Tests were conducted on three cars to estimate the acceleration and maximum speed obtainable by various power outputs, and the relative roughness engendered thereby. The cars were. (1) Std. Trials Car. G.S.R.14. (2) 18.G.IV. Japan engine with 110° shaft and Larger R.R. single carb. Free exhaust system. (3) 18.G.IV. Japan engine with 112° shaft and Twin Zenith carb. P.II. short type silencer and fishtail. The various power outputs are shewn on sheets I, II, & III. Briefly it was expected that 18.G.IV would shew a considerable increase in acceleration between 20 & 50 M.P.H. over both cars and that 18.G.IV. would also shew a better performance than standard but a better maximum speed but would not be so fast as 18.G.IV. SPEED TESTS. The speed results obtained were :- CAR. | Car wts. | Lap. speed. C.O. Closed. | Lap. speed. C.O. Open. | 1/4 mile. C.O. closed. --- | --- | --- | --- | --- GSR.14 std. China. | 33.7 cwts. | 63.2 | - | 62.5 18.G.IV. Japan. Free Ex. system. | 31.8 cwts. | 64.8 | 69.66 | - 18.G.IV. Japan. Twin Zenith. P.II. Ex. System. | 35.6 cwts. | 68.7 | 70.64 | 67.67 18.G.IV. China. std. 25HP. Ex. syst. | 35.6 cwts. | 61.41 | - | - Handwritten note on left margin: New Unit Increases top spd. of this car. c.o. closed by 7.3 m.p.h. | ||