9, four 250 horse-power Rolls Royce engines being
installed in the following order. Single engines are fitted in
both the forward and after cars, each driving two swivelling
four-bladed propellers. In the centre car two similar engines
are placed transversely, which drive single fixed propellers
mounted on steel tube outriggers through suitable gearing.
The engines are the standard 12 cylinder V-type Rolls Royce which
will develop over 300 brake horse-power at full throttle opening.
The engine is water cooled, and in the case of those in the
forward and after cars the original system consisted of an
internal radiator supplied by an auxiliary water tank carried in
the keel. It was found on the flight trials that the cooling was
insufficient, and external radiators were fitted, the internal
radiator and fan being removed. In the case of the centre car no
alteration was necessary, as external radiators were fitted in
the first instance.
The engines are supported by two steel tubes held by four
brackets bolted to the crank case, these being carried by twelve
duralumin tubes bolted to the bearers and transverse frames of
the car respectively. The drive from the engine is transmitted
through a universal joint to a short longitudinal shaft, running
on ball bearings.
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