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).
Performance graph for a 44 spring with a 5-inch compression shackle, showing load and rate characteristics.
| Identifier | ExFiles\Box 110\3\ scan0016 | |
| Date | 6th October 1940 | |
| 44 SPRING 5" COMPRESSION SHACKLE 6-10-40 3 1/8 WHEN SPRING IS MECH. FLAT. LOAD - LBS 1400 1200 1000 800 600 VIRTUAL DEFLECTION - INCHES 7 6 5 4 VIRTUAL DEFLECTION LOAD RATE RATE - LBS/INCH 180 140 100 4 PASSENGERS FIG.4. RIDE POSITION - INCHES REBOUND 3 2 1 0 1 2 3 BUMP BUMP | ||