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).
The effects and benefits of using Low Pressure Tyres, including weight reduction, appearance, and standardization.
| Identifier | ExFiles\Box 53\2\ Scan044 | |
| Date | 21th August 1923 guessed | |
| 7. the crank shaft may revolve ......o before tyre slippage takes place as against .........o with Low Pressure Tyres. This fact should appreciably reduce wear on transmission and enable slow running of engine under heavy loads without knock, or as an alternative should enable lighter flywheels and transmission to be used. 23. EFFECT ON UNSPRUNG WEIGHT. The Low Pressure Tyre reduces shocks on unsprung parts so much as to enable very great reduction to be made in axle and wheel weights and consequently in springs. Also the shocks transmitted to and through the springs are so much reduced as to make feasible reduced chassis and body weights without reduction in durability. 24. POSSIBLE REDUCTION IN CHASSIS WEIGHTS MEANS MORE ENGINE POWER. The final effect will be to give more liveliness to the car having a given engine fitted or conversely to enable a smaller engine to pull the same paying load without reduced speed. APPEARANCE. 25. Low Pressure Tyres when fitted do not appear grotesque and in fact only strike the ~~trained~~ observer as odd when exceeding the largest common sections fitted normally. Thus a 6" tyre in place of a 4" or 105 does not appear extra-ordinary., but an 8" tyre attracts attention if fitted instead of a normal 135 m.m. or 5" - After a little while such a tyre however, appears quite logical to the eye particularly in side view. Front and back views look unusual but not odd unless the wings are of small section than the MYEREMEX average. A wing with a bold flange looks quite normal with an 8" tyre. 26. Reduction in number of standard sizes possible. Today there are a multitude of standard sizes which have to be kept in stock by manufacturers and by all retailers - causing an enormous amount of capital to be locked up needlessly and preventing that economy of manufacture which can only be realised when making a few sizes in large quantities. This fact applies not only to Tyres but to initial equipment such as wheel, spare rims, spare rim holders etc. It is generally agreed that the mere fact of there being two | ||