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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).
Report discussing methods for silencing 20 HP rear dampers, with graphs illustrating load characteristics.

Identifier  ExFiles\Box 16\4\  Scan077
Date  19th April 1929 guessed
  
contd :- -2-

permanently silencing these 20 HP. rear dampers as yet.
We do feel that either the drilled valve (to the minimum extent) or dynamic restrictions help us with silence because both enable a high maximum load to be obtained without the sharp peak when the direction of the load is being changed.
It is the sudden reversal of load which causes the knock.

STANDARD DAMPER
HIGH LOADS AT THE
POINT OF LOAD
REVERSAL.

SLOTTED VALVE
PEAK LOAD DELAYED.

DYNAMIC RESTRICTIONS - PEAK LOAD
CENTRE OF STROKE.

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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