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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).
Specification sheet for springing, detailing front and rear springs, damper loads, car weight, and buffer clearances.

Identifier  ExFiles\Box 17\1\  Scan012
Date  7th March 1931 guessed
  
16.G.IV. Springing.

Front Springs. Piece No. F.57498.
N.S. O.S.
Loaded lbs. 632 - 809 635 - 763
Loaded camber. 1" Pos. - 1/2" pos. 1" Pos. - 1/2" Pos.
Initial camber. 4.937" 4.937"

Rear Springs.
Loaded lbs. 812. 822.
Loaded camber. Flat. Flat.
Initial camber. 6.250" 6.250"

Damper Loads.
Front. - 90/90 lbs. - one .055" dia. leak. HP. valve.
Rear. - 90/90 lbs. - one .055" dia. & one .032" dia leak. HP. valve.

Car Weight. (Unladen). One Spare wheel at rear.
Front. 14 cwt. 2 qrs. 14 lbs.
Rear. 17 cwt. 1 qr. 0 lbs.
Total. 31 cwt. 3 qrs. 21 lbs.

Buffer Clearances. N.S. O.S.
No Passengers. Front 2.2" 2.15"
Rear 4.85" 4.9"
4 Passengers. Front 1.85" 1.7"
Rear 3.6" 3.55"

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