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 plotting BTHUs per minute against RPM for an oil system under different test conditions.
| Identifier | ExFiles\Box 131\1\ scan0109 | |
| Date | 16th June 1933 guessed | |
| CURVE I STANDARD PER OIL SYSTEM EXTERNAL TANK FOR MEASUREMENT RELEASE OIL RETURNED DIRECT TO LOWER HALF FLOW TO TAPPET COVER BEING BLANKED. SP{Mr Spinney} HEAT MOTORINE C100 = .470 1 GALL. OIL AT 85°C = 8.75 lbs. OIL LEVEL NORMAL (1 GAL) IN SUMP OTHERWISE AS PREVIOUS TEST. RELEASE OIL RETURNED VIA TAPPETS (NORMAL) OTHERWISE AS LAST TEST. BTHUS/MIN LESS RADIATION. R.P.M. INLET 80.5°C INLET 80.5°C INLET TEMP 80.5°C 500 400 300 200 100 3500 4000 4500 | ||