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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).
Vibration response curves for a bumper on a Bentley 6-B-IV with centrally mounted wings and radiator.

Identifier  ExFiles\Box 118\2\  scan0246
Date  21th December 1935
  
To E.{Mr Elliott - Chief Engineer}
c. to Wor.{Arthur Wormald - General Works Manager}
c. to By.{R.W. Bailey - Chief Engineer}

Hs{Lord Ernest Hives - Chair}/AFM.{Anthony F. Martindale}4/KW.21.12.35.

Bumper for Bentley 6-B-IV with Centrally Mounted Wings and Radiator.

We attach hereto response curves taken on the Heenan & Froude vibrator.

These curves show that amplitude of vibration of frame and wings is practically unaffected by fitting a bumper either of the Harmonic or Phantom III type.

For maximum weight and money saving a bumper should therefore not be standardised at all: but for customers specially wanting a bumper the 17 1/4 lbs. Phantom III type should be standardised.

These curves also show what actual reduction of vibration there is over the standard system improved with the bumper bar, when the centrally mounted wings and radiator system is used. It will be seen that this reduction is slight, but the impression the driver receives is that the improvement is great, because wings, lamps and radiator can no longer be at their opposite extremes of travel at the same instant.

The curves also show how far we have still to go to reach the American standard.

Hs{Lord Ernest Hives - Chair}/A.F.Martindale.
  
  


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