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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).
To Mr. Barrington explaining the calculated efficiency of the Lentz Hydraulic System.

Identifier  ExFiles\Box 136\4\  scan0009
Date  15th January 1912
  
R.R. 300 6.11. (W. 524 25.5.11) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1693.

ROLLS-ROYCE LIMITED.

INSTRUCTIONS.

K/ 15-1-1912

To: Mr Barrington
Order No.:
Customer's No.: Z 524
Re: Lentz Hydraulic System

My estimated efficiency of 75% was based upon the fact that for a single pump a general efficiency is about 80%.
But in order to allow for good work use of all everywhere reducing friction generally, I allowed 87% as the efficiency of the Lentz pumps, but the motor also will have same losses, so that total efficiency will be 87% of 87% or 75.7%.
The more well known hydraulic gears are admittedly inefficient when the pumps are in action & there is nothing novel in Lentz system likely to give an increased efficiency when compared with general practice.

Signed: RWHB

This Sheet must be filed on completion of the work.
  
  


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