Also, a wound-mainspring arrangement would be much more effective as a low-cost, practical third-world product. It would be lighter, less costly to produce, and would require much less space. This gravity angle looks like a gimmick, possibly to avoid infringing someone's patent.
False, and the authors should be ashamed of themselves for posting this lie in a page meant to attract investors:
http://naldc.nal.usda.gov/download/38761/PDF
Also, a wound-mainspring arrangement would be much more effective as a low-cost, practical third-world product. It would be lighter, less costly to produce, and would require much less space. This gravity angle looks like a gimmick, possibly to avoid infringing someone's patent.