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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).
Crankshaft balancing, comparing the effectiveness of inner and outer intermediate bearings.

Identifier  ExFiles\Box 115\2\  scan0394
Date  2nd February 1939
  
- 2 -

BY/B.20/G.2.2.39.

(2). Inner Intermediate Bearing E.{Mr Elliott - Chief Engineer}
The inner weight is too far away from this bearing, (and not in correct line), to balance Crank 4 effectively. Crank 5 is not balanced.

(3). Outer Intermediate Bearing F.{Mr Friese}
The outer weight is too far away from this bearing to balance Crank 6 effectively. Crank 5 is not balanced.

[Diagram showing crankshaft layout labeled A-G and 1-6, and a force diagram for weights labeled 'Inner wgt.', 'Outer wgt.', '1&6', '2&5', '3&4', and an angle of '15°']

Conclusions.
The 'Packard' Scheme should not be proceeded with.
Scheme (b) (of the memo referred to above) should be used as regards distribution of weights.
These weights, from the bearing standpoint, should be as large as possible.

BY/B.
J.S. Bowes
  
  


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