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 graph for an oil cooler showing heat dissipation and pressure drop against varying oil and air flows.
| Identifier | ExFiles\Box 149a\2\ scan0317 | |
| Date | 23th August 1935 guessed | |
| OIL COOLER FOR R.R. ENGINE LIGHT TANK ONE TUBE 2'0" OVERWIRE BENT U SHAPE 7" RADIUS OUTSIDE FORMULA 22 | 3/4 | 9 | 1.814 | 23 | 43.3 | 125 | 30 INTERNAL WIRE 22G CU. OIL MAX. TEMP TO COOLER 180°F AIR INLET TEMP 105°F CONSTANT OIL FLOW = 20.5 LBS | MIN. CONSTANT AIR VELOCITY 1200FT | MIN. HEAT DISSIPATED VARYING OIL FLOW VARYING AIR FLOW OIL USED MOBILOIL "A" PRESS. DROP TO OIL FLOW PRESS. DROP TO AIR VELOCITY PRESS. DROP IN LBS. | "" B.T.U'S | HR | 75°F TEMP. DIFF. OIL MAX. TO AIR IN AIR VELOCITY FT MIN OIL FLOW LBS MIN CX{Major Len W. Cox - Advertising Manager} 93. | ||