The common practice to change from the pushing operation to towing, or vice versa, is both time - consuming and power - wasting, and it is hard to operate as well.

Though the cost of the venture would be immense, both in Labour and power, many believe that iceberg towing would prove less costly in the long run than the alternative of desalination of sea water.

This paper analyzes dynamical performances of a full power hydraulic brake system of aircraft towing tractor, and sets up a mathematical model of the hydraulic brake system.