To help shipborne aircrafts take off with the aid of the power of carrier engine the pulse stepless shafts are used as constant power stepless gearbox instead of the present used decelerator for carrier power.When shipborne aircrafts take off,the shafts transmit power to the drum set,around which the cables tow to accelerate the take off shipborne aircrafts.To improve the performance of pulse stepless shafts,point touches in overrunning clutches are converted into face touches,which can be realized by means of hydrostatic pressure lubricating technology.The take off weight can be increased greatly.Using pulse stepless shafts to replace decelerators can improve the cruise performance as well as the combat capibilit and the take off expenses can be reduced.