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 chart for a 3-tube type oil cooler, showing heat dissipation and pressure drop against flow rates.
| Identifier | ExFiles\Box 149a\2\ scan0309 | |
| Date | 23th August 1935 | |
| OIL COOLING CHART Nº CX.{Major Len W. Cox - Advertising Manager}107/3. DISSIPATION OF 3 TUBE TYPE COOLER EXTERNAL FORMULA 22/34/19/1814/23·1/43 3/8/Nº 30 TUBE PITCH ABOUT 4" OIL MEAN TEMP 175 AIR INLET 75 AIR VELOCITY 1,200 FT/MIN OIL FLOW 20 LBS./MIN/TUBE OIL PRESSURE DROP LBS./SQ IN / FT RUN AIR VELOCITY FT./MIN OIL FLOW LBS./MIN./TUBE B.T.U's PER HR. PER FT. RUN. AT 100° T.D. AIR IN TO OIL MEAN. B.T.U's v OIL FLOW B.T.U's v AIR FLOW OIL PRESSURE DISSIPATION AT 20LBS/MIN/TUBE EWS 23/8/35 | ||