Neil's uniflow 100 cc twin. 2 crankshafts, 4 pistons, brushcutter conrods($2 ea?). Did all the castings himself. The motor was good for 20,000rpm or somethng silly like that, could be wrong though but it certainly revved lots. Very clever dude.
He made a 500cc version for an autogyro. I've got a video of when he fired it up for the first time floating round here somewhere.
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