４つの転がる物が付いた物体を、いかに速く移動させられるかって
数学の分野？

http://www.kyosho.com/jpn/fun/movie/wmv/2006kwc.wmv

http://www.kyosho.com/jpn/support/setting/data/voenrrr_20041016_david.pdf

http://www.kyosho.com/jpn/fun/movie/wmv/2004shizuoka_inferno.wmv

http://www.kyosho.com/jpn/fun/movie/wmv/teamkyosho.wmv

http://210.253.122.57/jpn/fun/movie/wmv/2004shizuoka_toring.wmv

http://www.kyosho.com/jpn/products/rc/detail.html?product_id=100241