The clip shows the new high speed single cylinder research engine running - with a 50p coin balanced on the top of the block to demonstrate that the engine is highly balanced.
The demonstration begins with the engine being motored at 600 rpm and the speed is increased to 1200 rpm and then to 1800 rpm. The coin (a genuine 50 pence piece) begins to rotate, clearly showing that it has not been adhered to the engine in any way.
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