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Aviation History
1921
1921 - 0094.PDF
FEBRUARY IO, 1921 THREE-QUARTER FORWARD VIEW OF THE NAPIER SIXTEEN-CYLINDERED 1,000 h.p. "CUB" AERO-ENGINE : Designed for the combination of high power and light weight, rendered possible by the balance (in practical opposition, due to the arrangement of the cylinder-banks at their special relative angles) of inertias and combustion effort. For greater clearness of detail, the exhaust manifolds have been stripped. But the mass-construction will be seen to be even simpler than that of the " Lion," the four units in each bank being bonded together by the valve-gear casing instead of the detachable head, and the water leads likewise arranged in a single distribution and outlet line respectively through clamped rubber unions. The induction will also be seen to be symmetrically arranged to the port and starboard banks. fashion than is found on most cars, although automobile conditions permit the arrangement equally well. The other control lever likewise runs to the two carburet- tors, but it is connected to the pressure-equalising device in each, the purpose of which—in a Claudel as in at least one other make within our knowledge—is to equalise the pressures existing in the top of the float-chamber and in the main induction stream ; an operation which becomes necessary at any altitude above 6,000 ft. It has been found that owing to the high tension of the m H a H a a a a a a a a a a a m a si m HH HH SHSE1 THREE-QUARTER REAR VIEW OF THE NAPIER SIXTEEN- CYLINDERED 1,000 h.p. "CUB " AERO-ENGINE : In this view it will be seen that although the valve- gear operation differs from that of the " Lion,'' the same method of easing the starting by sliding the single camshaft by causing it to turn within a helically-grooved key-sleeve is embodied for the two upper banks, the two lower re- taining their compression. The mounting of the eight spark magnetos above and below the hollow . transverse bracket-exten- sion of the crank-chamber will be noted. Note also that the angle of the cylinder banks enables the bearer stubs and engine bearers to clear the lower bank, and that the upward effort of this bank pre- vents disruptive strain between the upper and lower sections of the crank- chamber.
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