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 test report between car models 18-EX and 73-OR, including performance data and a list of complaints for 18-EX.
| Identifier | ExFiles\Box 125\1\ scan0033 | |
| Date | 3rd June 1929 | |
| Hs.{Lord Ernest Hives - Chair} to EH from Mx{John H Maddocks - Chief Proving Officer} X1729. June 3rd.1929 COMPARATIVE TESTS BETWEEN 18-EX and 73-OR. We have today compared 18-EX with 73-OR our Phantom Standard Chassis. We found on weighing the car that 18-EX was approximately 2 cwts. lighter than 19-EX, but for comparison purposes we ballasted up to 2 tons. 7 cwts. 3qrs. 14lbs. Weight of 18-EX without passengers, 8 gallons of petrol 2 tons. 5 cwts. 3 qrs. 18-EX. STANTON. 10 - 28 m.p.h. 20 secs. 1st TICKNALL. 10 - 53 m.p.h. 40 secs. 2nd TICKNALL. 10 - 58 m.p.h. 59 secs. PISTERN HILL. Tree 10 m.p.h. start 1 - 2 secs. 73-OR 10 - 28 m.p.h. 23 secs. 10 - 50 m.p.h. 42 secs. 10 - 52 m.p.h. 63 secs. Start 10 m.p.h. Finish. 30 m.p.h. 1 - 7 secs. Weight 2 tons. 7 cwts. 3 qrs. 14 lbs. Complaints on 18-EX. Piston knock (cold) Steering. Shock absorber. Misfire. Windscreen wiper. Head Lights Rear Blind Oil pressure Brakes squeak. Radiator cap. See separate test card. When returning from Elstree on Friday last Lidsey driving 19-EX appeared on several occasions to be able to have a slight advantage over myself driving 18-EX at speeds from 30 to 60 m.p.h. Mx{John H Maddocks - Chief Proving Officer} [Signature] | ||