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Aviation History
1932
1932 - 0224.PDF
FLIGHT, MARCH 11, 193z dampers. These buffers surround the bolts securing the mounting plate to the aircraft frame, and further reduce the vibrations transmitted by the engine to the aircraft. The lubrication system used in the new series of engines represents an improvement as compared with that of the " Jupiters," and as a result of extensive experimentation, a device incorporated in the oil pump system enables the engines to be safely started and very quickly run up on cold oil and in very low air temperatures. This is re garded as a very valuable and important advance, espe cially when the engines are used in large flying boats 01 seaplanes, or, of course, when they are fitted in aircraft operating in cold climates. The problem of starting has been carefully studied, and provision is made for the use of several alternative systems, or even for several systems to be fitted together. The usual claw can be fitted on the airscrew hub for use with the Hucks starter. A distributor and non-return valves in each cylinder can be fitted for use with the Bristol gas starter, and on the rear cover, co-axial with the crank- LEADING PARTICULARS, BRISTOL "MERCURY" AND "PEGASUS" 1932 ENGINES High Altitude Types General Purpose Commercial Engine, type Mercury IV-S2 Pegasus Pegasus Pegasus S3 M2 M3 Pegasus Pegasus Pegasus Pegasus;Pegasus L2 L3 U2 U3 F2 Pegasus F3 Compression ratio Airscrew Airscrew, r.p.m. ^^ Engine, r.p.m. Normal r.p.m. J^rew "' Maximum r.p.m. ^fcrew ' Rated 1 Altitude alti- ^B.h.p. at normal r.p.m. tude J B.h.p. at max. r.p.m. Sea level take-off b.h.p. max. for 3 min. at normal r.p.m. Automatic boost control Oil pressure lb./sq. in. Oil return, gals./hr. * Standard weight, bare, lb. .. Average cruising fuel, gals./hr. Average cruising oil, pts./hr. 5-3 L.H. 0-655 1 2,250 1,475 2,600 1,700 13,000 ft. 505 540 530 Yes 80 160 920 22 8 5-3 L.H. 0-655 1 2,000 1,312 2,300 1,510 0-5 1 2,000 1,000 2,300 1,150 11,000 ft. 525 570 550 Yes 80 160 960 23 8 5-3 L.H. 0-655 1 2,000 1,312 2,300 1,510 0-5 1 2,000 1,000 2,300 1,150 4,500 ft. 555 615 580 Yes 80 160 955 23 8 5-3 L.H. 0-655 1 2,000 1,312 2,300 1,510 0-5 1 2,000 1,000 2,300 1,150 1,500 ft. 590 635 620 Yes 80 160 945 22 8 5-3 L.H. 0-655 1 1,900 1,240 2,185 1,430 0-5 1 1,900 950 2,185 1,095 Sea level 550 630 550 No 80 160 940 22 8 5-3 L.H. 0-655 1 2,000 1,312 2,300 1,510 0-5 1 2,000 1,000 2,300 1,150 Sea level 535 590 535 No 80 160 930 22 8 The above ratings are based upon fuel at least equal to D.T.D.134 of 73-77 octane value. * This weight does not include the optional or variable items of equipment. ASSEMBLY : " Pegasus " engines on their special stands. Note the accessibility of all components during assembly. The clean and unlittered state of the shop is typical of all the Bristol engine shops. (FLIGHT Photo.) 208
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