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).
Table of ignition timing settings against engine revolutions, with notes on detonation and governor performance.
| Identifier | ExFiles\Box 61b\4\ scan0045 | |
| Date | 6th July 1921 | |
| contd. -3- Hs{Lord Ernest Hives - Chair}1/LG6.7.21. Engine revs. Timing of ignition before dead point. 0 6º 500 17º 750 22º 1000 30º 1250 35º 1500 38º 1750 40º 2000 42º 2250 42º We found if we retarded the hand control one-third of the range we could obtain full power of the whole range without detonation. From our tests so far, we should say the rating of the governor is about right. Hs.{Lord Ernest Hives - Chair} | ||