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).
Test results for wheelbase and steering lock turning circles on a 1907 long car and a 1908 type frame.
| Identifier | ExFiles\Box 20\5\ Scan001 | |
| Date | 16th March 1911 guessed | |
| X.426. WHEEL BASE . LOCKS ETC. Test on 60591 long 1907 car wheelsbase 143 3/4" to left full lock 44' diam. circle outside front wheel. to right 47'9 ditto. (caught steering tube) EP.{G. Eric Platford - Chief Quality Engineer}10.10.07. Test on 60589 1908 type frame. 142 1/4" wheelbase. Full. (to left lock. 44' diameter circle. Lock. (to right lock 45'8" " " EP.{G. Eric Platford - Chief Quality Engineer} 28.10.07. | ||