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).
Test results for 6 and 12 cylinder engines with a flywheel, noting performance periods and valve bounce.
| Identifier | ExFiles\Box 4\1\ 01-page018 | |
| Date | 21th November 1933 | |
| -2- Ha/Rm.{William Robotham - Chief Engineer}B/KT.21.11.33. On 6 cyls. with a flywheel. Periods:- 600. 1050. 1350. Marked. 1650. Worst. 2450. Marked. On 12 cyls. with a flywheel. Periods:- 750. Worst. 1250. 1750. All the tests were continued up to 3000 R.P.M. at which speeds the valves bounced. We are trying to get hold of the 12 cyl. Lincoln again to run it on 6 cyls. Ha/Rm.{William Robotham - Chief Engineer} | ||