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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).
Tests of standard and special rear springs, giving load per inch of deflection.

Identifier  ExFiles\Box 79\3\  scan0168
Date  10th November 1913
  
From Exp. Dept.
Copies for:
J.{Mr Johnson W.M.}
R.{Sir Henry Royce}
Ha.
Da.{Bernard Day - Chassis Design}

Wor{Arthur Wormald - General Works Manager}/Hyll/L101113.
November 10th. 1913.

Tests of Standard and special Rear
Springs giving load per inch of
deflection. X.910.

Two springs were tested, one being a standard rear spring and the other a rear spring with plates of equal thickness, equal curvature, and clipped ends.

Standard. Special.

No. of Plates. 9 8
Thickness of spring. 3.14" 2.9"
Weight of spring. 75.5 lbs. 69 lbs.
Thickness of top Plate. .42" .36"
Initial Camber. 1.9" 2"
Load at 1" camber. 316 lbs. 333 lbs.
" " 0 " 650 " 665 "
" " 1" neg. camber. 977 " 989 "
" " 2" " 1348 " 1344 "
" " 3" " 1761 " 1722 "
" " 4" " 2256 " 2139 "
" " 5" " 2816 " 2545 "

Both springs were greased between the plates before testing.
  
  


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