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).
Table outlining potential speed increases from various car alterations.
| Identifier | ExFiles\Box 29\3\ Scan163 | |
| Date | 27th October 1927 guessed | |
| POSSIBILITIES OF TRUE FOR A LARGE CAR WITH 100 HP ENGINE AND NORMAL SPEED TOURING CAR 75 M.P.H. ALTERATION TO CAR INCREASE IN SPEED M.P.H. REMOVING FRONT WINGS COMPLETELY | 6 M.P.H. INCREASING B.H.P. OF CAR BY 25 HP. ON SPORTS BODY | 3.5 M.P.H. CAREFULLY DESIGNED FLARED WINGS | 3 M.P.H. FITTING STREAMLINE TAIL | 2.5 M.P.H. GENERAL BODY DESIGN NO RUNNING BOARDS, VSCREEN, WHEELS IN TAIL ETC. | 2.5 M.P.H. INCREASING AXLE RATIO 7% | 2 M.P.H. COMPLETE UNDERSHIELD | M.P.H. BONNET VENTILATION | M.P.H. | ||