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).
The features and testing plans for the 4.EX experimental chassis.
| Identifier | ExFiles\Box 41\1\ Scan081 | |
| Date | 27th February 1920 | |
| R H.{Arthur M. Hanbury - Head Complaints} 235 A (100 T) (S.F 846 6-8-19) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2460 X 3777 Extract from Hs{Lord Ernest Hives - Chair}2/LG27.2.20. X. 3764. RE 4.EX CAR. §--- I propose to bring 4.EX chassis (the latest experimental chassis) to West WitteringHenry Royce's home town next week. This chassis is fitted with the following new features - X. 3777. 6. Double valve springs. X. 3943. 7. Dunlop wheels - 3 fitted with Firestone and 3 fitted with Sanwell demountable rims. X.3944. 3895. X.3859. 8. Straight sided tyres. X.3839. This car is also to have the E-arthed wiring scheme fitted but owing to modification this will not be on. We shall run the car down fitted with an ordinary 2-seater test body. MADE AT CROMLEY | ||