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 | | | | ||