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Aviation History
1917
1917 - 1333.PDF
DECEMBER 20, 1917. MAIN PfcTKOL TANK. ~ Fig. 25.—Diagram of petrol systems used inconjunction with petrol pump. ponding falling of the castor oil, the petrol is drawn into the annular chamber through the inlet or lower check valve._Upon the downward stroke of the no 210 *0 00 50 / / —— / / 7Ajtot. Tn 1 . H ** / OA, a* ( .—• »— c i a rQ. rUJ a a T"i gu 0f CL no I00 •9. •QL RP.M. Fig. 28.—Power, throttle, and consumption curves. Mo ( IN o i.U c_ PIN T O OE S.REE3 It \ S3* k '•• o* **^ > ,—- 4 i ,"\ \ \ \s < ; . 77 7 Z 7 c i 2< kS \ \ \ V Fig. X6.—Test of petrol pump at 700 r.p.m. i5o* ISO? . 2iO? 2Ao? 270* 3oC DtGRCL5 Bp CHAMK»HAfT Fig. 29.—Valve lift diagram. \ \ i 3Jo" 5*0 Za- 700 »o * Fig. 27.—Test of petrol pump. aw RPM piston, the petrol charge, above the castor oil seal, closes the inlet check valve and forces the charge out of the upper valve. The volume of petrol discharged at every stroke corresponds, of course, to the dis- placement of the oil by the stroke of the piston. From the delivery of the pump, petrol is forced through a pipe into the top of the pressure reservoir inside the main petrol tank, and rising in the reservoir creates a cushion of compressed air above the petrol in the reservoir, thus serving to damp out the pulsa- tions conveyed to the petrol by the action of the pump. From the bottom of the pressure reservoir the petrol is forced upwards through the shorter of the two pipes inside the reservoir, and is delivered under an even pressure to the carburettors. A relief pressure valve is fitted to allow excess petrol to return to the main petrol tank through twelves holes",drilled in the head casting of the pressure |£-reservoir. - '•- - •• : "' .; M ' ."#' -• :•
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