Proposal to test the 4.EX experimental chassis, listing five new features to be fitted.
| Identifier | ExFiles\Box 76\2\ scan0133 | |
| Date | 27th February 1920 | |
| X.3699 Extract from Hs {Lord Ernest Hives - Chair} 2/LG27.2.20. EH X.3764. RE 4.EX CAR. z I propose to bring 4.EX chassis (the latest experimental chassis) to West Wittering(Henry Royce's home town) next week. This chassis is fitted with the following new features - X.3563. 1. Thermostat Control. 3Y54a X.3881. 2. Cast Iron Pistons - split type. X.3630. 3. Magneto fixed at an angle. X.3699. 4. Serrated Magneto Drive. X.3733. 5. Pinned Tappets. | ||
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).