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).
Investigation into a failed shock damper casing and a comparison of cylinder wall thicknesses with production samples.
| Identifier | ExFiles\Box 16\5\ Scan154 | |
| Date | 10th November 1933 | |
| FILES. x7520. 10.11.33. SHOCK DAMPER CASINGS. After 5 1/2 hours running on the P.II bumper chassis, the off-side front damper casing cracked from excessive internal oil pressure. The ball pin load was 400 lbs. This casing together with 4 other production casings was section at the point of failure. The casing which failed had been cast with the core cantilevered from the far end. The cores for the production dampers are located from both ends, so should be more concentric with the mould. Thickness of the Cylinder Walls. | | Damper which failed. | Production Dampers. | | | | |---|---|---|---|---|---| | | | 1 | 2 | 3 | 4 | | Minimum thickness | .150" | .193" | .175" | .191" | .166" | | Maximum thickness | .200" | .239" | .234" | .232" | .202" | We have now run 2 P.II front dampers on the bumper chassis for 66 hrs. without any failure. The ball pin load being 400 lbs. Hs{Lord Ernest Hives - Chair}/L es. | ||