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).
Graphs of tests recording under-bonnet pressure versus road speed for different ventilation configurations.
| Identifier | ExFiles\Box 119\3\ scan0198 | |
| Date | 1st February 1932 | |
| P1 243 COLT BONNET VENTILATORS. TESTS RECORDING PRESSURE UNDER BONNET. STANDARD UNDERSHIELDS. RECORDED BY U TUBES. CHASSIS No. 20 EX. RESULTS GIVEN ARE AVERAGE OF 4 READINGS. TWO ON EACH SIDE OF ENGINE, HALF WAY BETWEEN SIDE HINGE & BOTTOM OF SIDE PANEL, ONE AT FRONT END & ONE AT REAR END OF ENGINE. Graph 1: Title: TOP GEAR X-Axis: ROAD SPEED (M.P.H.) Y-Axis (Left): PRESSURE UNDER BONNET (INCHES OF WATER) Y-Axis (Right): LBS/SQ IN., .018, .036, .072, .09 Graph 2: Title: 3RD GEAR X-Axis: ROAD SPEED (M.P.H.) Y-Axis (Left): PRESSURE UNDER BONNET (INCHES OF WATER) Y-Axis (Right): LBS/SQ IN., .018, .036, .054 Graph 3: Title: 2ND GEAR X-Axis: M.P.H. Y-Axis (Right): LBS/SQ IN., .018, .036 Legend: (long-dash line) COLT VENTILATION. (solid line) NO VENTILATION (short-dash line) R.R. BONNET SHUTTERS OPEN. | ||