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Aviation History
1924
1924 - 0498.PDF
AUGUST 7, 1924 Suggested mounting for Rolls- Ro yce «« Condo r '' engine. bearings consist of divided phosphor-bronze shells, lined with white-metal. The crankcase is of special aluminium alloy, and is made in two halves joined along the centre-line of the crankshaft. The upper half is arched, and carries the cylinders, etc., while the lower half is trough-shaped. Long bolts pass through both halves, two at each main bearing. The lower half carries at the rear end the three oil pumps and one water circulating pump. These are driven from the timing gear by a shaft. It might be mentioned that there are two scavenger pumps, one drawing oil from each end of the crankcase, and one pressure pump forcing the oil from the tank to the bearings. In this connection it might be mentioned that in the " Condor " a single-pressure system has been adopted, the camshafts being lubricated under the same pressure as the main bearings. This avoidance of two systems, a high-pressure and a low- pressure, naturally results in greater simplicity, and on that score, as well as on certain others, has a not inconsiderable advantage over the hitherto usual two-pressure system. The pressure employed is fairly high, something like 93 Ibs./sq. in. we believe. The scavenger pumps each have a coarse oil filter, but the main filter for the pressure pump is supplied as a separate unit which can be mounted on the machine in an accessible position and readily taken to pieces for inspection and cleaning. A centrifugal water circulating pump is fitted below the bottom half of the crank-case. In some of the photographs the outer stator casing can be seen. The impeller, or rotor, is not cast, as is usually the case, but is built-up from brass sheet. This form of construction has resulted in a con siderable saving in weight. All water pipe connections are provided with special joints in which rubber rings work in compression, and which are, moreover, almost entirely shielded from the light, so that there should be no trouble with leaky water joints. The twin carburettor is of the Rolls-Royce Claudel-Hobson type, and is, as previously mentioned, mounted in a very low position so as to facilitate gravity feed. A special 26-000- R.R. Dimensioned sketch-diagram of the «'Condor," giving some of the more important measurements. Other details are shown in the drawing of a suggested mounting given above. 498
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