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).
Graph showing the load, deflection, and rate characteristics of an A4 spring with a 4.5 inch shackle.
| Identifier | ExFiles\Box 110\3\ scan0014 | |
| Date | 12th September 1940 | |
| A4 SPRING 4.5" SHACKLE. 12/9/40 4.5" TENSION SHACKLE. 2" WHEN SPRING IS MECH. FLAT. LOAD - LB. 1400 1200 1000 800 600 400 200 VIRTUAL DEFLECTION — INCHES 6 5 4 3 2 RATE RATE LB/INCH 340 300 260 220 180 140 100 BUMP FIG. 2 2 PASSENGERS NO OPENING MECH. FLAT. 4 PASSENGERS RIDE POSITION - INCHES 4 3 2 1 0 1 2 3 4 REBOUND BUMP | ||