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).
Test report summary on oil suction line performance and water disturbance at different oil levels.
| Identifier | ExFiles\Box 135\3\ scan0077 | |
| Date | 25th October 1934 guessed | |
| 3 Distance oil suction line below oil level height (continued) Oil height Oil height running idle 1-9/16 --- 1-7/8 --- 1/2 --- 13/16 from bottom 1-1/8 --- 1-7/16 --- 1/4 --- 7/16 from bottom Water disturbance in terms of nominal level, Full --- O.K. no disturbance 3/4 --- O.K. no disturbance 1/2 --- -O.K. no disturbance 1/4 --- O.K. no disturbance. SUMMARY. It will be noted that with 1/4 oil level the location of the end of the suction pipe of the B.W.P. device was but 7/16 of an inch from the bottom of the sump which is 3/16 of an inch lower than normally used by the "H" series Lycoming engines or the Studebaker President "8". These two manufacturers for the above models locating their suction lines approximately 5/8 of an inch from the bottom of the sump. It will be observed that no water disturbance developed even at this low level, where the end of the suction line was but 1/32 of an inch above the surface of the water in the bottom of the sump. It is quite obvious inasmuch as dirt lies even lower than the water level that since the water was not disturbed any dirt or sediment lying in the bottom of the sump would likewise be left undisturbed. This assumption will be definitely proved on subsequent descriptions of later test procedures. | ||