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).
Ride quality test comparing different vehicle models by measuring water displacement.
| Identifier | WestWitteringFiles\O\2April1926-June1926\ Scan022 | |
| Date | 1st April 1926 guessed | |
| contd :- -4- chassis with more rigid support and spring deflections throughout arranged to correspond exactly with those on the 20 HP. which gives us such excellent riding. Our present test shewed us that we could definitely measure an improvement in riding due to the extra weight on the back of the car. (g) To prevent any misapprehension as to the magnitude of the road shocks that we are measuring, we give the following details of one of our tests. Ordinary good main road with a slightly wavy surface. Test stretch 3/4 mile long - road speed 25 m.p.h. [Diagram showing a rectangle representing a water container] Initial water level. Final level 20 HP. .270 .187 Final level 40/50 .570. Quantity of water lost - 20 HP = .56 cu.ins. New PhantomCodename for PHANTOM I = 4 cu.ins. Measuring device fixed to the centre of the rear seat boards. From these figures it will be seen that even on the car which is the source of complaint the actual displacement of the passengers is very small, though this small movement is definitely uncomfortable. (h) It will be observed that we have confined our tests exclusively to the conditions specified by Sales as a source of complaint. While weaker front springs do not shew up to great advantage under these circumstances, our impressions contd :- | ||