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).
Chart showing gain or loss in lap speed (MPH) for the 10 E.X. model under various configurations.
| Identifier | ExFiles\Box 71\1\ scan0314 | |
| Date | 7th September 1927 | |
| STANDARD CONDITION HOOD DOWN. C.O. OPEN TAIL UNDERSHIELD AND WINGS ON H.P. TYRES AND LOUVRED BONNET. GAIN OR LOSS IN LAP SPEED M.P.H. OVER STANDARD CONDITION GAIN LOSS C.O. CLOSED: Loss 3.25 HOOD UP: Loss 1.50 PLAIN BONNET: Loss 1.00 UNDERSHIELD OFF: Loss .50 TAIL OFF: Loss .94 BALLOON TYRES: Loss .82 FRONT WINGS OFF: Gain 1.00 EFFECT OF VARIOUS CONDITIONS ON THE SPEED OF 10 E.X. ROLLS-ROYCE, LIMITED PRINT ROOM, 7 SEP 1927 | ||