When analyzing capabilities and limitations of tugs, pilot C...
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Ano: 2006
Banca:
Marinha
Órgão:
DPC - Marinha
Prova:
Marinha - 2006 - DPC - Marinha - Praticante de Prático |
Q2196981
Engenharia Naval
When analyzing capabilities and limitations of tugs, pilot Carlos pointed out the following notes:
I) ASD (Azimuth Stern Drive) - Tugs, reverse-tractor and tractor tugs operating at a ship’s side have better performance when braking assistance than normal conventional tugs, because they have almost the same bollard pull astern as ahead.
II) A tug pulling at right angles to the bow of a ship, stopped in the water, will give the ship a lateral velocity and a rate of turn, causing the ship to pivot around a point somewhere near the bow.
III) Tractor tugs, with azimuth propellers, can achieve high pushing and pulling effectiveness when using a longer towline, because they can set their propellers thrusters, thus diverting the propellers washes. In this way they can avoid the propeller wash hit a ship’s hull.
IV) A tug keeping position at an angle with the ship’s hull may also exert rather high pushing forces caused by the waterflow, depending on the ship’s speed and the tug’s underwater hull form.
From the list of Carlos is correct to affirm, according to the book “Tug Use in Ports”, that:
I) ASD (Azimuth Stern Drive) - Tugs, reverse-tractor and tractor tugs operating at a ship’s side have better performance when braking assistance than normal conventional tugs, because they have almost the same bollard pull astern as ahead.
II) A tug pulling at right angles to the bow of a ship, stopped in the water, will give the ship a lateral velocity and a rate of turn, causing the ship to pivot around a point somewhere near the bow.
III) Tractor tugs, with azimuth propellers, can achieve high pushing and pulling effectiveness when using a longer towline, because they can set their propellers thrusters, thus diverting the propellers washes. In this way they can avoid the propeller wash hit a ship’s hull.
IV) A tug keeping position at an angle with the ship’s hull may also exert rather high pushing forces caused by the waterflow, depending on the ship’s speed and the tug’s underwater hull form.
From the list of Carlos is correct to affirm, according to the book “Tug Use in Ports”, that:
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