The fan angle of lower leg of lead leg at last run-up stride greatly influences the falling of CG and the horizontal velocity before coming to board and the vertical veloxity of take-of.

• 助跑最后一步摆动腿着地时 ,其小腿支撑扇角对踏板前的身体重心下降、水平速度以及离板瞬间的重心垂直速度有重要影响。