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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).
Vehicle specifications for steering, suspension, turning circle, and performance data from a hill climb test.

Identifier  ExFiles\Box 21\4\  Scan090
Date  31th December 1921 guessed
  
-3-

Steering box - reversible - self-centering. no road shocks felt.
Side steering rod ball ends solid with levers.
4 springs - working load 392 lbs. compressed 9/32".
4 start - worm and segment (Bronze)
Dia. of circle to turn car -
Right hand turn 49 ft. 10 ins.
Left hand turn 50 ft.
Length from centre of front universal joint to centre of axle - 65 3/8".

Slack in transmission.
Top gear measured on road wheel 1 3/16".
Dia. of steering wheel 17.75". 1 1/4 turns from full lock to full lock.
Vacuum Tank - capacity 2.9 qrts. 13 charges delivered 1 qrt.
Height from bottom of petrol tank to inlet of above 3' 5" 52 charges delivered 1 gall.
Distance covered by one revolution of road wheel 8 ft. 11 ins.

Ticknall Hill Test.-

| Time. | M.P.H. | Time. | M.P.H. | Time. | M.P.H. |
|-----------|--------|-----------|--------|-----------|--------|
| 0 | 10 | 0 | 10 | 0 | 10 |
| 1/4 min. | 21.7 | 1/4 min. | 22.3 | 1/4 min. | 25.4 |
| 1 " | 28.5 | 1 " | 28.5 | 1 " | 32.3 |
| 1 1/2 " | 34.1 | 1 1/2 " | 37.2 | 1 1/2 " | 38.5 |
| 1 m.41 s. | 37.2 | 1 m.34 s. | 37.2 | | |
  
  


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