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).
Specification table for static deflection springs for the B.50 and 'Silver' Wraith models.
| Identifier | ExFiles\Box 154a\4\ scan0074 | |
| Date | 22th June 1938 guessed | |
| 8" Static Deflection Springs, B.50 and "Silver" Wraith. Normal sprung weight. 900 lbs. 950 lbs. 1000 lbs. Wire diameter. 0.645" 0.653" 0.660" Mean diameter of coils. 4.855" 4.847" 4.840" Number of effective coils. 6+ 6+ 6+ Normal load. 1552 lbs. 1639 lbs. 1724 lbs. Normal deflection. 4.650" 4.640" 4.650" Maximum load. 2216 lb. 2340 lb. 2464 lb. Maximum deflection. 6.638" 6.628" 6.638" Maximum stress uncorrected. 102,200 lb/in^2 103,900 lb/in^2 105,700 lb/in^2 Maximum stress corrected. 122,000 lb/in^2 124,000 lb/in^2 126,200 lb/in^2 Rate. 334 lb/in. 353 lb/in. 372 lb/in Rate at wheel. 112.5 lb/in. 118.7 lb/in. 125 lb/in Room available for packing. 0.13" 0.06" 0 Leverage ratio is 1.724 Deflection normal to maximum is 1.988". | ||