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).
Comparison of car performance with rubber engine mountings and a specific ratio, noting it is smoother and less noisy than a standard 25 HP car.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan088 | |
| Date | 7th January 1930 | |
| -3- HS{Lord Ernest Hives - Chair}/ALL.1/ML.7.1.30.Contd. and is slightly more fussy, when using the 11/30 ratio, but even so with the rubber engine mounting the car is smoother and less noisy than the present standard 4.75:1 compression 25 HP. car. HS{Lord Ernest Hives - Chair}/AJL. | ||