Rolls-Royce Archives
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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).
Photographic study of crankshaft vibration patterns under different balancing conditions and speeds.

Identifier  ExFiles\Box 137\4\  scan0405
Date  1st December 1931 guessed
  
Top row, left to right:
Image 1: 2400, No Balance Weights
Image 2: 2400, 95% Balance

Middle row, left to right:
Image 3: 3300, 95% Balance 41 fms at Periphery
Image 4: 2400, No Weights 41 fms at Periphery
Image 5: 2400, 95% Balance, 41 fms at Periphery
Image 6: 3300, 95% Balance

Bottom row, left to right:
Image 7: 2400, 1 lb in Couple opposing No 6 Crank
Image 8: 2400, No Couple
Image 9: 2400, 1 lb in Couple in same direction as No 6 Crank
  
  


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