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).
Table of possible combinations for inner and outer springs for the Spectre independent front wheel suspension.
| Identifier | ExFiles\Box 95\3\ scan0020 | |
| Date | 31th August 1934 guessed | |
| SHEET (3) TABLE II POSSIBLE COMBINATIONS OF INNER AND OUTER SPRINGS. SPECTRECodename for Phantom III - INDEPENDENT FRONT WHEEL SUSPENSION. | No. of Combination. | | Outer Spring Designation. | Inner Spring Designation. | Normal Load at Wheel. | Rate at Wheel. | Max. Stress Outer and Inner. | |---|---|---|---|---|---|---| | 1 | X | A.O. | A.I. | 1000 lbs. | 101.8 lbs/in | 105,000 lbs/in² both. | | 2 | | A.O. | B.I. | 1008 lbs. | 100.8 lbs/in | 107,500 lbs/in² inner. | | 3 | | A.O. | C.I. | 1078 lbs. | 110.9 lbs/in | 110,400 lbs/in² inner. | | 4 | | A.O. | D.I. | 1108 lbs. | 114.6 lbs/in | 112,700 lbs/in² inner. | | 5 | | B.O. | A.I. | 1092 lbs. | 111.2 lbs/in | 107,500 lbs/in² outer. | | 6 | X | B.O. | B.I. | 1100 lbs. | 110.2 lbs/in | 107,500 lbs/in² both. | | 7 | | B.O. | C.I. | 1171 lbs. | 120.3 lbs/in | 110,400 lbs/in² inner. | | 8 | | B.O. | D.I. | 1203 lbs. | 124.0 lbs/in | 112,700 lbs/in² inner. | | 9 | | C.O. | A.I. | 1120 lbs. | 111.2 lbs/in | 110,400 lbs/in² outer. | | 10 | | C.O. | B.I. | 1128 lbs. | 110.2 lbs/in | 110,400 lbs/in² outer. | | 11 | X | C.O. | C.I. | 1200 lbs. | 120.3 lbs.in. | 120,400 lbs/in² both. | | 12 | | C.O. | D.I. | 1228 lbs. | 124.0 lbs/in. | 112,700 lbs/in² inner. | | ||