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).
Spring deflection and ground clearance for a 'V' Series car under 'normal' and 'loaded' conditions.
| Identifier | ExFiles\Box 69\3\ scan0222 | |
| Date | 16th May 1925 | |
| R.R. 493a (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. 48770 REF: Hs{Lord Ernest Hives - Chair}3/LG16.5.25. To B.J. from Hs.{Lord Ernest Hives - Chair} 'V' SERIES EAC. 'NORMAL' AND 'LOADED' CAR. Handwritten numbers: 48770, 48840, 18410 Referring to BJ2/H9.5.25. Normal load = Car ready for road with all fuel, spares etc. Loaded = Car and full complement of passengers. The position of the weight which constitutes the difference of the two above quantities will place about 80% on the rear springs and 20% on the front. Hence the extra deflection of the front springs will be approximately one quarter that of the rear. According to Drg. F.9927, the difference between 'normal' and 'loaded' position of the rear springs is 1.950", and it follows that the difference at the front is .488" approx. The lowest point of the undershield (under flywheel) is approximately one-third the distance between front and rear axles (measured from the front); therefore the difference in ground clearance at this point to spring deflection is :- (1.950 - .488) / 3 + .488 = .975" To this figure may be added the difference in deflection of the tyres, which will however be almost negligible. Hs.{Lord Ernest Hives - Chair} | ||