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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).
Noise issues in Wraith shock dampers and comparing complaint statistics with the Phantom III model.

Identifier  ExFiles\Box 9\8\  08-page12
Date  22th April 1937
  
642

Hs.{Lord Ernest Hives - Chair} from Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie}

Rm{William Robotham - Chief Engineer}/Les3/R.22.4.37.

WRAITH SHOCK DAMPER KNOCKS.

There is very little reason why Wraith dampers should be less noisy than P.III dampers.

The load of the P.III front dampers has been reduced to a minimum to prevent knocking. After extensive rig tests it appears to be impossible to produce a quiet and more powerful damper which is not a separate unit.

Wraith rear dampers will not knock if they are produced accurately. If the dampers are built in a new section of the Works, as contemplated, care will be needed to retain the degree of accuracy.

The figures below are taken from the latest Quarterly complaints - Hd{Mr Hayward/Mr Huddy}10/AR.10.2.37:-

30 H.P. P.III.

Hydraulic Knocks.
December Quarter C.C. 1 -
C.P. 1 -
Previous Quarter C.C. 1 -
C.P. - -
Six Months ............ 3 -

Failure of Governor Control.
December Quarter C.C. 2 1
C.P. - -
Previous Quarter C.C. 3 -
C.P. 2 -
Six Months ............ 7 1

This shows that there are only a few complaints of knocking from the present production type of chassis. At the moment, work is being done to obtain a satisfactory damper which will require less accurate manufacture, and will give the full requirements without a hydraulic control system.

Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie}
  
  


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