The structure of the towline 
 Towline shape like a tank chain, composed of many unit chain to rotate freely between the chain. High and outside the towline of the same series of the same pitch, towline high bending radius R may have a different choice. Unit chain around the chain plate and the upper and lower lid, the towline each section can open, easy assembly and disassembly, threading do not have to open the cover can be cable, tubing, and trachea into the towline. Towline basic parameters of material: reinforced nylon, with high pressure and tensile load, good toughness, high elasticity, abrasion resistance, flame resistance. High and low temperature performance, you can use outdoors. Anti-patience: oil, salt and acid, alkali. 
 Speed ??and acceleration: the maximum speed of up to 5 m / s, maximum acceleration of up to 5m / s 2 (specific speed, acceleration, depending on the operation.) Operational lifetime: the use of the normal overhead, up to 5 million the number of reciprocating motion ( specific life depending on the operation).