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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).
Page discussing the significance of oil pressure and its variation with speed, including a data table.

Identifier  ExFiles\Box 65\1\  scan0129
Date  17th February 1926 guessed
  
contd :-

-8-

oil pressure, this factor becomes of signifinance where previously it could be neglected. Amongst other things the initial ignition advance is delayed as the load does not start to lift until gap G; has attained measureable dimensions.

(b) Variation with speed.

This can almost be accounted for by the increase in oil pressure with speed. Thus in a certain case

[Table Begin]
R.P.M. | Load lifted. max. | Oil Pressure. | % difference. Oil pressure. | Lift.
1000 | 50 | 13.5 | 12% | 20%
1500 | 60 | 15
[Table End]

The reason for the remaining small discrepancy is somewhat obscure.

Hs{Lord Ernest Hives - Chair}/W.A. Robotham.

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