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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 for Front Spring No. A-9809.

Identifier  ExFiles\Box 43\2\  Scan207
Date  9th October 1925
  
SPRING SPECIFICATION
A9809
New Particulars for 1150 lb. Front Spring (1701 Series).

Front Spring No. A-9809 - Revised Oct. 9/25.

Approx. Free Camber (unclipped) - 3.250
Flat load (unclipped) - 920 lbs.
Stiffness (unclipped) - 315.3 lbs./inch.
Stiffness (clipped to wide axle pad) - 350±10 lbs./inch.
Load at 1/2" neg. (unclipped) - 1150 lbs.±20 (Stamp this load on spring.)
Centers - Eye to Eye - Flat - 43.5"
Thickness approx. - 2.972"
Plates 14.

Detail of Plates:

No. Thick-ness Lengths Initial Radius Final Radius desired after bumping
Front Rear Total
Main .265 See A-8871 165" 225"
2 .250 20.000 21.500 41.500 70" 80"
3 .218 18.500 19.750 38.250 50" 60"
4* .218 16.875 17.875 34.750 50" 60"
*Drill for clips 15.687 16.687
5 .218 15.125 16.125 31.250 50" 60"
6 .218 13.500 14.500 28.000 50" 60"
7 .218 12.125 12.875 25.000 50" 60"
8* .218 10.750 11.250 22.000 50" 60"
*Drill for clips 9.862 10.062
9 .187 9.000 9.500 18.500 45" 49"
10 .187 7.750 8.250 16.000 45" 49"
11 .187 6.500 7.000 13.500 45" 49"
12 .187 5.375 5.625 11.000 45" 49"
13 .187 4.250 4.375 8.625 45" 49"
14 .187 3.000 3.000 6.000

[STAMP] FEBY 1927
  
  


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