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Calculating Ship's Astern Power

Normally a ship fitted with steam turbines has an astern power, one third of ahead power. If a ship is 7,000-ton deadweight with speed of 15 knots, what is the astern power?

Given:

Deadweight = 7,000 tons
        Speed = 15 knots

What is asked:

Astern power

Solution:

Step 1. Solving for ahead power

            Ahead Power = Weight × Speed
                                  = 7,000 tons × 15 knots
                                  = 105,000 knot-tons is the ahead power



Step 2. Solving for astern power. We are going to get one third of 105,000.

            Astern power = 105,000 knot-tons ×  1  = 35,000 knot-tons
                                                                      3




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