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).
Specifications for front and rear springs, drawings F.61003 and F.61009.
| Identifier | ExFiles\Box 106\1\ scan0362 | |
| Date | 14th September 1935 | |
| To accompany letter to Messrs.Rolls-Royce Ltd., dated 14.9.35. Our ref. HWP/28/35. Spring Dept.Tinsley. Front Spring.Drawing F.61003 - 850.lbs. - 2 off. Plate Nos. | Th/nesses. Inches, H & T. | Lengths. Inches. | Remarks. 1.MP. | .22 Standard .22 | 38 - 2 eyes. | Clip centres { Front end 6.5/8" and 14.3/8". Ex centre bolt { Rear end 7.3/8 and 15.7/8". 2. | .20 .21 | 36.0. | Range of stress to the loaded position - 43.5 tons per sq.inch. 3.x. | .19 .21 | 31.7/8. | 4. | .18 .20 | 27.3/4. | Clip centres Marked thus x. 5. | .18 .20 | 23.3/4. | Note. Thicknesses shewn are calculated only, but are near enough for all practical purposes. 6. | .17 .20 | 19.7/8. | 7.x. | .16 .20 | 16.0. | 8. | .16 .20 | 13.1/4. | 9. | .16 .19 | 8.1/2. | Total. | 1.62. | | F59619/20 Clip F 58166 Centre Bolt Rear Spring. Drawing F.61009. - 1125.lbs. - 2 off. Plate Nos. | Th/nesses. Inches. H & T. | Lengths. Inches. | Remarks. 1.MP. | .26. | 56. - 2 eyes. | Clip centres { Front end 9.1/4" and 17.3/4". Ex centre bolt { Rear end 9.1/4" and 17.3/4". 2. | .25. | 54.1/2. | Note. These are the Standard clip centres we always send to you, and NOT as shown on your blue-print No.F.61009 - 9.1/2" & 18.1/4". 3. | .24. | 47.1/2. | Please Amend. 4.x. | .23. | 40.1/2. | Clip plates Marked x. Range of Stress to the loaded position - 34.4 tons per sq.inch. Note. Thicknesses shewn are calculated only, but are near enough for all practical purposes. 5. | .23. | 33.3/4. | 6. | .23. | 28.2. | 7.x. | .22. | 22.575. | 8. | .22. | 16.95. | 9. | .22. | 12.075. | 10. | .22. | 7.95. | Total. | 2.320. | | F 55131. U Bolt F 70905 Centre Bolt | ||