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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).
Springing specifications for vehicle 18-EX as it left Derby, detailing front and rear springs and damper loads.

Identifier  ExFiles\Box 17\1\  Scan016
Date  7th March 1931 guessed
  
18-EX. Springing. (As it left Derby before proceeding to Le CanadelHenry Royce's French residence).

Front Springs. Piece No. F.78795.
N.S. O.S.
Loaded lbs. 1045 1065
Loaded camber. Flat. Flat.
Initial camber. 4.50" 4.50"

Rear Springs. Piece No. F.79446.
N.S. O.S.
Loaded lbs. 1200 1200
Loaded camber. Flat. Flat.
Initial camber. 10.3125" 10.250"

Damper Loads.
Front. - 80/70 lbs. No leak.
Rear. - 85/80 lbs. No leak.

No further particulars are available.

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