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).
Top gear acceleration times tested with different needle settings.
| Identifier | ExFiles\Box 11\4\ 04-page070 | |
| Date | 2nd July 1932 | |
| X7941. 19-EX. TOP GEAR ACCELERATION 90° Needle. M.P.H. AVERAGE SECS. 10 - 20 5.4 20 - 30 4.9 30 - 40 5.1 40 - 50 5.7 50 - 60 7.1 60 - 70 9.1 70 - 80 18.9 85° Needle. 10 - 20 5.2 20 - 30 4.9 30 - 40 5.2 40 - 50 5.6 50 - 60 7.0 60 - 70 9.2 70 - 80 17.9 95° Needle. 10 - 20 5.2 20 - 30 5.1 30 - 40 5.3 40 - 50 6.1 50 - 60 6.5 60 - 70 9.8 70 - 80 21.4 (Handwritten initials, possibly WMR) Axle ratio 9% wt 6 2/0 % | ||