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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).
Spring specification for an 1100 lb. Front Spring (1701 Series), No. A-8546.

Identifier  ExFiles\Box 43\2\  Scan208
Date  12th January 1927
  
7139 A
SPRING SPECIFICATION
A8546

Particulars for 1100 lb. Front Spring - (1701 Series).

Front Spring No. A-8546

Approx. Free Camber (unclipped) 3.250"
Flat Load (unclipped) - 945 lbs.
Stiffness (unclipped) - 295±5 lbs./in.
Stiffness (clipped to wide axle pad) - 330±10 lbs./in.
Load at 1/2" neg. (unclipped) - 1100±20 lbs.
Centers - Eye to Eye (flat) - 43.5"
Thickness (approx.) - 2.940"
Plates - 14

Detail of Plates:
No. Thick-ness Lengths Initial Final Radius desired after bumping
Front Rear Total Radius
Main .285 See A-8371 155" 228"
2 .218 20.000 21.500 41.500 50" 60"
3 .218 18.500 19.750 38.250 50" 60"
4* .218 16.875 17.875 34.750 50" 60"
*Drill for clips 15.887 18.887
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 9.562 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 5.875 5.625 11.000 45" 49"
13 .187 4.250 4.875 8.625 45" 49"
14 .187 3.000 3.000 6.000 45" 49"

JAN 12 1927
  
  


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