53.the location of discharge valve operating handle for ballast system is incorrect. Valve shaft to be of upwards for convenience.

压载系统排放阀操纵杆位置不对，阀杆应向上以便操作。

The airship has a rigid structure made of carbon fiber and aluminum, rotating propellers for takeoff and landing, and a ballast system that compresses helium to control the lift.

飞艇具有的坚硬结构由碳纤维和铝组成，旋转螺旋桨用于起飞和着陆, 而一个压载系统则压缩氦来控制升降。