Aerocraft which is lighter than air is applied to hovering flight and vertical taking off and landing by thrust vector steering mechanism.According to the analysis of principle of thrust vector steering mechanism

a new structural project is deseribed

which is from the transmission of worm-wheel steering

and exact adjustment of redirector.After the target parameters are ensured

selection basis of servo motor is given by the calculation of moment

and then design of the worm-wheel steering is carried out.Lastly

the isochronous steering of two airscrews is realized.Apparently

the study has reference value for the design of power control in airship platform.