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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).
Data table showing torque and pull forces applied to springs at various degrees of twist.

Identifier  ExFiles\Box 54\3\  Scan131
Date  19th August 1924 guessed
  
-3-

Spring No.
Twist of spg. in degrees. | Pull 'P' lbs. | Torque applied. lbs.ins. | Pull 'P' lbs. | Torque applied. lbs.ins. | Pull 'P' lbs. | Torque applied. lbs.ins.
.33 | 137 | 2192 | 144 | 2304 | 129 | 2064
.67 | 212 | 3392 | 228 | 3650 | 187 | 2992
1.00 | 270 | 4320 | 336 | 5375 | 216 | 4175
1.33 | 322 | 5156 | 427 | 6832 | 310 | 4970
1.67 | 379 | 6064 | 512 | 8200 | 412 | 6592
2.00 | 442 | 7072 | 601 | 9616 | 474 | 7580
2.33 | 483 | 7728 | 673 | 10768 | 534 | 8550
2.67 | 514 | 8224 | 765 | 12240 | 602 | 9640
3.00 | 584 | 9344 | 831 | 13296 | 670 | 10720
3.33 | 645 | 10320 | 924 | 14784 | 703 | 11250
3.57 | 678 | 10848 | 1004 | 16064 | 774 | 12370
4.00 | 749 | 11984 | 1088 | 17408 | 847 | 13550
4.33 | 788 | 12608 | 1164 | 18624 | 898 | 14388
4.67 | 843 | 13488 | 1220 | 19520 | 967 | 15475
5.00 | 885 | 14160 | | | 1029 | 16464
5.33 | 944 | 15104 | | | 1092 | 17470
5.67 | 989 | 15824 | | | 1136 | 18176
6.00 | 1048 | 16768

There will be a compression equal to the pull 'P' in the rear half of the spring.

Hs{Lord Ernest Hives - Chair}/ACL.
  
  


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