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).
Series of graphs showing the effect of restricting air vent ball lift on a Phantom II rear shock damper.
| Identifier | ExFiles\Box 55\4\ Scan419 | |
| Date | 21th November 1930 guessed | |
| FIG III P. II REAR SHOCK DAMPER. 450 R.P.M. 1" STROKE. AIR VENTS .025 DIA. OIL TEMP. 25°C LOADS 80/85. GRAPH BOX 1 (TOP LEFT): AIR VENT BALLS. H.P. & L.P. LIFT .010 H.P. STROKE. FIG. I. GRAPH BOX 2 (TOP RIGHT): AIR VENT BALLS. H.P. & L.P. LIFT .008 H.P. STROKE. FIG 3. GRAPH BOX 3 (BOTTOM LEFT): AIR VENT BALLS. H.P. & L.P. LIFT .010 L.P. STROKE. FIG. II. GRAPH BOX 4 (BOTTOM RIGHT): AIR VENT BALLS. H.P. & L.P. LIFT .004 H.P. & L.P. STROKE. H.P L.P EFFICIENCY REDUCED 50% FROM FIG. I FIG. IV. AXIS LABEL: 154 LBS/☐" BOTTOM TEXT: EFFECT OF RESTRICTING LIFT OF AIR VENT BALL ON PH. II REAR DAMPER 12.75" LEVER. — OVAL LEVER | ||