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 report on a car's performance after a 300-mile run, noting its speed, handling, and fuel consumption.
| Identifier | Morton\M22\ img064 | |
| Date | 8th August 1920 | |
| To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. Da.{Bernard Day - Chassis Design} c. C.J. c. P.N. X.3763 R.{Sir Henry Royce} on 1 EX : THE BEST CAR I HAVE EVER HAD ORIGINAL 9cE.C. (5) R24/H10. 8.8.20. RE 1.EX. I have run this 300 miles and I am very pleased with it; from every point of view it seems the best car I have ever had. Speeds of 70 have been touched many times, and for quietly sliding through towns, it is delightful. It is therefore smooth and quiet and fast. There is only the reaction vibration that one can complain about. This is manifest because it pulls so extremely vigorously over a range of speed from the veriest crawl upwards. X.4060 The american tyres seem remarkably good. They were pumped to 75 lbs. ☐ ", before starting, and the car seemed to run remarkably freely, with a consumption of 18 M.P.G. at a good speed, averaging 25 all through a long journey, but X3056 Generally the car was running 40, with 50 to 60 occasionally, and on a few occasions, 70, as above. The miles were correctly indicated, (counted) and agreed to 1% of the mile stones, but the petrol was measured by gauge stick, (which please check). The total average load is two tons. No doubt soft tyres would make the hold on the road better, at corners where pot holes abound, but my hard tyres are better and safer for touring, and probably are considerably cheaper to run for tyres and petrol.(this should be confirmed) I also think there is much less risk of side-slip on grease. Contd. R'R' 3227 (100 L) 2 C' C'2 19-2-20) C.S. 3812 | ||