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 detailing possible combinations of inner and outer springs for the Spectre independent front wheel suspension.
| Identifier | ExFiles\Box 95\3\ scan0026 | |
| Date | 7th September 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.1 | 1000 lbs. | 101.8 lbs/in | 105,000 lbs/in.2 both. 2 | | A.O. | B.1 | 1008 lbs. | 100.8 lbs/in | 107,500 lbs/in2 inner. 3 | | A.O. | C.1 | 1078 lbs. | 110.9 lbs/in | 110,400 lbs/in2 inner. 4 | | A.O. | D.1 | 1108 lbs. | 114.6 lbs/in | 112,700 lbs/in2 inner. 5 | | B.O. | A.1 | 1092 lbs. | 111.2 lbs/in | 107,500 lbs/in2 outer. 6 | X | B.O | B.1 | 1100 lbs. | 110.2 lbs/in | 107,500 lbs/in2 both. 7 | | B.O. | C.1 | 1171 lbs. | 120.3 lbs/in | 110,400 lbs/in2 inner. 8 | | B.O | D.1 | 1203 lbs. | 124.0 lbs/in | 112,700 lbs/in2 inner. 9 | | C.O | A.1 | 1120 lbs. | 111.2 lbs/in | 110,400 lbs/in2 outer. 10 | | C.O | B.1 | 1128 lbs. | 110.2 lbs/in | 110,400 lbs/in2 outer. 11 | X | C.O X | C.1 | 1200 lbs. | 120.3 lbs/in | 110,400 lbs/in2 both. 12 | | C.O | D.1 | 1228 lbs. | 124.0 lbs/in. | 112,700 lbs/in2 inner. | ||