Test data table for propeller shaft periods against buffer-axle clearances at various throttle settings.
| Identifier | ExFiles\Box 15\4\ Scan048 | |
| Date | 16th May 1929 guessed | |
| PROP' SHAFT PERIODS 40 to 50 M.P.H. TABLE COLUMNS: Column 1: BUFFER-AXLE CLEARANCES Column 2: 1/4 THROTTLE Column 3: 1/2 THROTTLE Column 4: FULL THROTTLE TABLE DATA: Row 1: 6 INCHS | OK | OK | OK Row 2: 5 3/4 | OK | OK | OK Row 3: 5 1/2 | OK | SLIGHT 42-45 MPH | SLIGHT 42-45 MPH Row 4: 5 1/4 | OK | " | " Row 5: 5 | OK | " | " Row 6: 4 3/4 | Very slight period between 4.75" & 5" inches. OK above & below this measurement at 42-45 M.P.H. Row 7: 4 1/2 | " | " | " Row 8: 4 1/4 | " | " | " Row 9: 4 | | [50 MPH: 1/16", 45 MPH: OK, 40 MPH: OK] | [50 MPH: 1/16", 45 MPH: SLIGHT, 40 MPH: OK] Row 10: 3 3/4 | OK | | [50 MPH: 1/16", 45 MPH: SLIGHT, 40 MPH: OK] Row 11: 3 1/2 | OK | [50 MPH: 1/16", 45 MPH: OK, 40 MPH: OK] | [50 MPH: 1/8", 45 MPH: SLIGHT, 40 MPH: OK] Row 12: 3 1/4 | OK | | [50 MPH: 1/8", 45 MPH: SLIGHT, 40 MPH: OK] Row 13: 3 | OK | [50 MPH: 1/8", 45 MPH: SLIGHT, 40 MPH: OK] | [50 MPH: 1/8" INCREASING SLIGHTLY, 45 MPH: SLIGHT, 40 MPH: OK] Row 14: 2 3/4 | OK | [50 MPH: 1/8", 45 MPH: SLIGHT, 40 MPH: OK] | [50 MPH: VIBRATION FELT THROUGH CHASSIS, 45 MPH: SLIGHT, 40 MPH: OK] Row 15: 2 1/2 | OK | [50 MPH: 1/8", 45 MPH: SLIGHT, 40 MPH: OK] | [50 MPH: 3/16" DITTO, 45 MPH: SLIGHT, 40 MPH: OK] Row 16: 2 1/4 | OK | | Row 17: 2 | OK | | SIGNATURE (Bottom right): OJA | ||
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).