By means of analyzing the traction drive character of the tethered aerostat capstan

the design factors

such as the principles about friction transmission

the security of anti-slip

the power of traction drive

the brake force of capstan

the centrifugal force and the bending rigidity of the tether are preliminarily discussed.It can be concluded that to avoid whole tether slip and to reduce local tether abrasion are the principles of designing friction transmission for tethered aerostat capstan

increase in tension difference between each ends of tether makes local tether slip more possible

increase in tension difference between each ends of tether makes local tether slip more possible

pseudo warp angle of the tether increases as the tension decreases.