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The arguably wildest creation of Kelsey Martin was a motorcycle powered by a  six-cylinder horizontally opposed air cooled engine out of  a Corvair automobile. The engine was supercharged by a Latham roots type blower  fed by four carburetors. The output of the engine was put through a special right angle drive gear box custom made by a tool and die maker who worked at Pratt& Whitney, so that a conventional but (very heavy duty) rear chain drive could be used.

A special Martin-fabricated frame incorporated a rigid rear and telescopic front forks.

Very few photos of the Unholy Six exist.