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).
Comparative tests of the maximum speed and acceleration between small and large bore 20 HP chassis.
| Identifier | ExFiles\Box 5\2\ 02-page280 | |
| Date | 24th September 1929 | |
| To Hy.{Tom Haldenby - Plant Engineer} from Ha/Rn.{Mr Robinson} c. to EP.{G. Eric Platford - Chief Quality Engineer} MX.{John H Maddocks - Chief Proving Officer} X5830 Ha/Rn.{Mr Robinson}5/WJ.24.9.29. MAXIMUM SPEED 20 HP. CAR. -------------------- We have carried out comparative tests comparing the small and large bore 20 HP. chassis. The object of the test was to ascertain whether there was any appreciable difference between the maximum road speed attained by these two chassis when carrying identical bodies. In all three pairs of chassis were compared. They were picked at random from those on test with the exception of G.X.O.21., the chassis turned down by Sales which was included in the test. The chassis were all fitted with identical closed test bodies, wings and wheels, and loaded up to the same weight. The first portion of the test consisted of trying the acceleration of the chassis side by side at all speeds from 30 m.p.h. up to the maximum of which the cars were capable. In every case at every speed the large bore chassis was able to pass the small bore chassis. At max. speed the difference in performance between the large and small bore was very little but definately in every trial the large bore was faster. The second portion of the test consisted in timing the two cars (1) Running full throttle over a mile of give and take road starting at 30 m.p.h. | ||