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 the results of 50-hour and 100-hour endurance tests on a Wraith oil pump with a Tufnol driven gear.
| Identifier | ExFiles\Box 149\2\ scan0196 | |
| Date | 14th April 1939 | |
| WRAITH OIL PUMP 'TUFNOL' DRIVEN GEAR EW973 DELIVERIES AFTER 50 HR & 100 HR ENDURANCE TESTS MOTORINE 'C' OIL TEST 1 - 50 HRS AT 2000 P.R.P.M, 75°C, 25 Lbs/o" PRESSURE TEST 2 - 100 " " 2000 " , 100°C, 25 " " DELIVERY IN PTS/HR AI P.R.P.M. INITIAL DELIVERY AFTER 50 HR & PRIOR TO 100 HR TEST AFTER 100 HR TEST | ||