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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).
Trial of a simple servo spring to reduce clutch pedal pressure, which was subsequently fitted to car 33-EX.

Identifier  ExFiles\Box 93\3\  scan0320
Date  24th June 1937
  
Sg.{Arthur F. Sidgreaves - MD} from Rm.{William Robotham - Chief Engineer}
Hs.{Lord Ernest Hives - Chair}
O.{Mr Oldham} E.{Mr Elliott - Chief Engineer}
O.{Mr Oldham} By.{R.W. Bailey - Chief Engineer}
O.{Mr Oldham} Da.{Bernard Day - Chassis Design}

312

Rm{William Robotham - Chief Engineer}12/R.24.6.37.

Lightened Clutch Pedal Pressure.

We have now had an opportunity of trying the simple servo spring to reduce clutch pedal pressure mentioned in American Report of March 31st, 1937, page 5.

We have demonstrated the clutch fitted with this spring to E.{Mr Elliott - Chief Engineer} The general impression is that the effort required to operate the clutch is halved.

The scheme is fitted to a car - 33-EX - which has increased pedal travel.

Rm.{William Robotham - Chief Engineer}
  
  


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