Graphs showing the effect of restricting air vent ball lift on a Phantom II rear shock damper.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan008 | |
| Date | 3rd December 1930 guessed | |
| P. II. REAR SHOCK DAMPER. 450 R.P.M. 1" STROKE. AIR VENTS .025 DIA. OIL TEMP. 25°C. LOADS 80/85. Top-left graph: AIR VENT BALLS. H.P. & L.P. LIFT .010 H.P. STROKE. 154 LBS/D" FIG. I. Top-right graph: AIR VENT BALLS. H.P. & L.P. LIFT .008 H.P. STROKE. 154 LBS/D" FIG. 3. Bottom-left graph: AIR VENT BALLS. H.P. & L.P. LIFT .010 L.P. STROKE. 154 LBS/D" FIG. II. Bottom-right graph: AIR VENT BALLS. H.P. & L.P. LIFT .004 H.P. & L.P. STROKE. EFFICIENCY REDUCED 50% FROM FIG. I 154 LBS/D" H.P. L.P. FIG. IV. EFFECT OF RESTRICTING LIFT OF AIR VENT BALL ON PH. II REAR DAMPER 12.75" LEVER. — OVAL LEVER | ||
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).