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).
Test results and calculations for spring load, camber, and stiffness under various mounting conditions.
| Identifier | ExFiles\Box 43\2\ Scan123 | |
| Date | 5th April 1926 | |
| Oy3-E-4526 -3- April 5, 1926 (5) Spring not clipped. Supported on shackle one end. Shackle inclined approximately 20° outwards, i.e. as on Phantom (but greater angle). Camber Load Stiffness 2" 463 288 1" 751 334 0 1085 366 -1" 1451 402 -2" 1955 (6) Spring clipped as in 2 above but mounted on shackle inclined outwards 21.1° as on Phantom. Calculated effect of drop in shackle pin. Camber Load Stiffness 2" 403 304 1" 707 328 0 1035 346 -1" 1381 398 -2" 1779 (7) As above. Calculated additional effect due to horizontal tension. Camber Load Stiffness 2" 388 305 1" 693 342 0" 1035 375 -1" 1410 440 -2" 1950 | ||