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).
Calculations on the effect of new inner tubes on car and wheel weight, and kinetic energy.
| Identifier | ExFiles\Box 4\4\ 04-page41 | |
| Date | 1st December 1923 guessed | |
| X424 Effect of New Inner Tube Car Wt. 45 cwt = 5040 lbs. Extra wt of inner tubes = 35 lbs. ∴ % increase on wt of Car. = 3500 / 5040 = .7 of 1% % Increase on wt of Car = .7 of 1% Present wt of Wheel = 88 lbs. Proposed increase = 7 lbs. ∴ % increase on wt of wheel = 700 / 88 = 7.95% % Increase on wt of Wheel = 7.95% Increase Total K.E. of car and wheels at 60 m.p.h. Approximately 645,100 ft-lbs. Added K.E by four inner tubes 3,360 ft-lbs. Additional K.E = 1/2 of 1% of the Car. approx | ||