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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).
Road tests investigating a 'booming' sound in existing cars by stiffening the roof.

Identifier  ExFiles\Box 3\1\  01-page101
Date  25th November 1913
  
COPY.

Lord Herbert Scott.
25-11-13.

"Booming" in existing Cars.

I have to-day carried out some road tests on a Limousine at Barkers.

(1) The roof was first stiffened by steel fish-plates screwed to the ribs (hood sticks) and the booming noted by the amplitude of vibrations of elastic bands tuned to same note as roof.

(2) The fish-plates were then removed and the booming similarly noted by elastic bands tuned to the lower note.

The roof in 1st. stiffened condition boomed less than in the 2nd unstiffened condition and one could feel the difference in ones ears.

The new insulated roof idea cannot well be applied to existing cars but, I think, when a customer complains of a booming roof we can, as the next best thing, improve matters by stiffening the roof by means of fish-plates at a moderate cost.

The fish-plates increase the weight of roof from 10 to 15 lbs.

(sgd) R.D.Spinney.
  
  


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