Hand & foot tilting semi-recumbent trike

Based on the automatic steering system that is controlled by changing center of body weight. As it is much stable than two-wheel drive bicycle, it can be easily used by the old and weak persons, women and girls who couldn't learn to ride bicycle because of fear.
Moreover, as it can be powered by hand and/or feet, the partially disabled person on hand or foot can enjoy it.
http://www.skywheel.kr/board/read.php?np=1&pid=69952&uid=988080