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).
Wheel wobble and balance testing, including notes on a Delaunay-Belleville vehicle.
| Identifier | ExFiles\Box 20\5\ Scan014 | |
| Date | 24th October 1912 guessed | |
| Wor{Arthur Wormald - General Works Manager}/Hy{Tom Haldenby - Plant Engineer}23/L26513 (contd) 3. itself. The whole front of the car oscillates from side to side in a most alarming manner when wheels are 2 lbs out of balance. I fitted some bumps 1/4" high to the front tyres of this car; this made a very bad thumping noise on the road. The idea was to find if tyres out of round cause wobbles. I found that if the bumps were out of balance the wobbles were bad, also there was the nasty thumping noise already mentioned. If however the bumps were balanced by weights the steering did not wobble but the thumping still remained. Of course these bumps are very big and one would never use a tyre so much out of round. The pieces which were fitted to the tyre were sections cut from an old outer cover and were strapped on in a similar manner to a gaiter. They weighed about 2 lbs each. Delaunay-Belleville. Dia. of steering wheel 16 1/4" Wooden road wheels 935 X 135. Steering reversible both ways. To move road wheels through 60° the steering wheel moves through 590°. Full lock of front wheels 62°. I made tests with this car by adding weights to front wheels and it required 3 lbs on each wheel before a distinct wobble could be produced and then it was not a | ||