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).
Graph showing the effect of different bonnet and shutter configurations on engine water temperature.
| Identifier | WestWitteringFiles\U\May1930-July1930\ Scan105 | |
| Date | 26th June 1930 guessed | |
| GRAPH III. STANDARD REAR BONNET SHUTTERS OPEN. FRONT UNDERSHIELD OFF FRONT BONNET SHUTTERS OPEN ALL SHUTTERS OPEN. LOUVRED BONNET LOUVRED BONNET FRONT PAN OFF. TOP WATER TEMP. BOTTOM WATER TEMP. SPEED 62 M.P.H. ATS. TEMP. 20°C. 19 E.X. 14x52 AXLE. WT. 48 CWT. EMPTY. STANDARD 6 m/m 7 1/2 m/m TUBES. MATRIX AREA CAR RUN UNTIL TEMPS BECOME STABILISED. | ||