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 comparing the performance of different types of radiator cores for slow-speed cooling.
| Identifier | ExFiles\Box 15\1\ Scan384 | |
| Date | 24th September 1930 guessed | |
| TITLE: TYPES OF RADIATOR CORE FOR SLOW SPEED COOLING Y-AXIS: H.P. DIS. PER SQ. FT. FRONTAL AREA. PER 100° DIFF. IN TEMP. X-AXIS: AIR SPEED THROUGH MATRIX M.P.H. HANDWRITTEN NOTE: Present Test DIAGRAMS & DESCRIPTIONS: 'C': ZIG ZAG RIBBON WITH INDIRECT COOLING (Dimensions: .078, .250) 'A' & 'B': TUBES .250 DIA EXPANDED TO HEXAGON ENDS (Dimension for B: .405) LEGEND: DALBY 7 M.M. TUBES 4.0" LONG, 1MM GAP TABLE DATA: HEADER: WT EMPTY, WT FULL, SQ. FT SURFACE, FREE AIR AREA %, % DIRECT, DEPTH A: 11.0, 15.6, 33.8, 61.6%, 93%, 4.0 B: 12.3, 14.4, 37.2, 72.7%, 28.0%, 3.250 C: 14.5, 18.9, 51.5, 64.2%, 54%, 4.0 | ||