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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).
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
  
  


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