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).
Two graphs illustrating spring rating tests, comparing shackle angle and pad width.
| Identifier | ExFiles\Box 43\2\ Scan162 | |
| Date | 27th May 1926 guessed | |
| TOP GRAPH: (2) SPRING RATING TESTS (δ) AND (€) EFFECT OF SHACKLE ANGLE NARROW PADS Y-AXIS: RATING LBS/IN X-AXIS: TOTAL SPRING LOAD. LBS. LEGEND: δ = 21° FORWARD SHACKLE € = VERTICAL SHACKLE ANNOTATIONS: WORKING, RANGE, δ, € BOTTOM GRAPH: (3) SPRING RATING TESTS (B) AND (€) EFFECT OF PAD WIDTH. VERTICAL SHACKLE Y-AXIS: RATING LBS/IN X-AXIS: TOTAL SPRING LOAD. LBS. LEGEND: B = WIDE PAD € = NARROW PAD ANNOTATIONS: WORKING, RANGE, 1100 LBS, B, €, (B), (€) | ||