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 for coil spring ratings and wheel ratings, with notes on rubber bush deterioration.
| Identifier | ExFiles\Box 154a\4\ scan0111 | |
| Date | 30th March 1939 | |
| - 3 - Da {Bernard Day - Chassis Design} /DB. {Donald Bastow - Suspensions} 10/G.30.3.39. (3) cont'd. {John DeLooze - Company Secretary} = (Coil spring rating x .323) + 23 lbs/in. or Rating of required coil spring = (Rating at wheel - 23 lbs./in.) / .323 For B.50, we have Rating at wheel = (Coil spring rating x .3125) + 23 lbs/in. or Rating of required coil spring = (Rating at wheel - 23 lbs/in.) / .3125 It seems probable that the rating of the rubber bushes will be reduced as deterioration occurs, and an even more accurate approximation might be obtained by taking a mean rate for the rubber bushes. In order to obtain this a rating figure for a set of rubber bushes about to be scrapped is required. Da {Bernard Day - Chassis Design} /DB. {Donald Bastow - Suspensions} TR {Capt. F. W. Turner - Finance} | ||