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Sweet potato harvesting requires the destruction of a massive amount of above ground vine material before digging can begin. The efficiency of harvesting is greatly increased if the potatoes are detached from their root stems before they are dug. The development of a machine in a university mechanization research program which successfully accomplished these two tasks is reported, including field testing on commercial farms and laboratory test results. Further, the development of drawings and bills of material resulting in a “know-how” contract between the university and the manufacturer, and the subsequent cooperation between these two, are described.

The major deterrent to long term, service free life, of the conventional induction magneto used on small engines is the breaker point system. A multiple spark cycle, capacitor discharge magneto system, controlled by solid state switching, provides extreme long life operation without system deterioration. A simple electronic spark advance system can be included where necessary Modular construction affords ease of fabrication and provides design flexibility Consistent engine spark timing is assured throughout the life of engine and ignition system.