This shows the front standard reduction drive, coupling two crankshafts together to the central propeller drive. On the left is a small gear as one of two drives to the sleeve drive shafts and internally there is a flexible through shaft to one of either the high speed or low speed drives to the blower/supercharger at the rear of the engine. The engine is a Mk VII to be seen in the World of Wearable Arts and Cars Museum by Nelson Airport, South Island, NZ.
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