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).
Particulars of a spring for a Spectre independent front wheel suspension system.
| Identifier | ExFiles\Box 95\3\ scan0083 | |
| Date | 30th April 1935 guessed | |
| Particulars of Spring 5" Initial Deflection at Wheel Simple Lever System, SpectreCodename for Phantom III Independent Front Wheel Suspension. Diameter of Wire. 0.810". Mean diameter of coils. 3.965". Number of effective coils. 5 1/2 Normal Load. 3290 lbs. Normal deflection. 1.825". Free Length (approx). 8.825". Maximum load. 5370 lbs. Maximum deflection. 2.975". Maximum stress (uncorrected). 102,100 lbs/in². " " (corrected). 134,300 lbs/in². Rate, lbs/in. 1807. Rate, lbs/in.at wheel. 240. Normal load at wheel. 1200 lbs. Maximum load at wheel. 2113 lbs. | ||