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).
Revised road spring schedule and weight calculations for various car models.
| Identifier | ExFiles\Box 43\2\ Scan068 | |
| Date | 28th October 1925 | |
| OyS-E-102025 October 28, 1925. [Handwritten note: Car + Chassis No.?] To: Mr. Nadin Mr. Bagnall Mr. Hulley Mr. Southern Mr. Caswell Mr. Steele - Mr. Spencer Mr. Ross Mr. Burton Mr. Beaver Mr. Doolittle From: Mr. Olley Re Road Springs Below is a revision of our road spring schedule of September 30, 1924. The springs are unchanged but the frame clearances have been corrected. Enclosed Drive Cabriolet includes "Tilbury" and "Sudbury". Sedan includes "Pickwick" and "Barwick". Limousine includes "Buckingham" and "Canterbury". (Full tanks and tools are assumed in all weights.) Rdstr. Phœ. Tour. Salamanca E.D. Cab. Full Cab. Sedan Lim. Wgt. 4950 5000 5075 5250 5250 5350 5400 5400 F.{Mr Friese} 2380 2380 2380 2420 2440 2430 2450 2450 R.{Sir Henry Royce} 2570 2620 2695 2830 2810 2920 2950 2950 Deduct unsprung 350 front, 680 rear F.{Mr Friese} 2030 2030 2030 2070 2090 2080 2100 2100 R.{Sir Henry Royce} 1890 1940 2015 2150 2130 2240 2270 2270 Add passengers 120 front, 480 rear F.{Mr Friese} 2150 2150 2150 2190 2210 2200 2220 2220 R.{Sir Henry Royce} 2370 2420 2495 2630 2610 2720 2750 2750 Spring loads per wheel (Calculated.) F.{Mr Friese} 1075 1075 1075 1095 1105 1100 1110 1110 R.{Sir Henry Royce} 1185 1210 1248 1315 1305 1360 1375 1375 Theoretical Springs Front Spring - load Rear Spring - load x 1-1/2 F.{Mr Friese} 1075 1075 1075 1095 1105 1100 1110 1110 R.{Sir Henry Royce} 1780 1810 1870 1970 1960 2040 2060 2060 Springs Used F.{Mr Friese} 1050 1050 1050 1050 1100 1100 1100 1100 R.{Sir Henry Royce} 1800 1800 2000 1900 1900 2000 2000 2000 [Handwritten note: Extra heavy because car is generally overloaded] | ||