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).
Performance comparison graph of different radiator core types, plotting HP dissipated and air pressure drop against air flow.
| Identifier | ExFiles\Box 149a\2\ scan0297 | |
| Date | 1st April 1914 | |
| TOP LEFT SECTION: NORRIS STRIP FRONTAL AREA = 1 SQ FT COOLING SURFACE = 26.4 SQ FT FEET RUN TUBING = 66.5 WEIGHT OF TUBING = 4 LBS WATER VELOCITY - 1.66 FT PER SEC = 4.4 GALLONS PER MIN PER SQ FT AIR INLET 100° F WATER MEAN 200° F DIAGRAM SECTION: TUBE TYPE TINNED COPPER GILL SEAMED OVAL TUBES DIMENSIONS: 6 3/4" WIDTH 9 1/16" PITCH 1 3/4" 2 1/2" 1/8" AXES LABELS: LEFT Y-AXIS: AIR PRESSURE (INCHES OF WATER) DROP IN STATIC RIGHT Y-AXIS: HP DISSIPATED PER FRONTAL AREA X-AXIS: AIR FLOW - CUBIC FT PER MIN. PER SQ FT FRONTAL AREA GRAPH LINES: HP DISSIPATED COPPER GILLS IRON GILLS 3/8 OLD TYPE FILM HOT PRESSURE STRIP FILM AIR PRESSURE STRIP CORD ELEMENT TRUNK FORE AND AFT | ||