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).
Set of graphs showing air pressure under the bonnet at various road speeds for Chassis 20 EX.
| Identifier | ExFiles\Box 131\1\ scan0027 | |
| Date | 18th September 1931 | |
| CHASSIS 20 EX AIR PRESSURE UNDER BONNET (RECORDED BY U TUBES) STANDARD UNDERSHIELDS. RESULTS GIVEN ARE AVERAGE OF FOUR READINGS, TWO ON EACH SIDE OF ENGINE, HALF WAY BETWEEN BONNET SIDE HINGE & BOTTOM OF SIDE PANEL, ONE AT FRONT END & ONE AT REAR END OF ENGINE. TOP GEAR PRESSURE UNDER BONNET (INCHES OF WATER) ROAD SPEED (M.P.H.) LBS / SQ IN FLIP FLAP SHUTTERS (3 EACH SIDE) SHUTTERS OPEN ----------x SHUTTERS CLOSED: -------o RADIATOR FITTED WITH 6 x 7.5 MM MATRIX TUBES. | ||