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( ) uma barcaça possui uma relação entre a boca e o calado superior a 6,0 e, uma relação entre a boca e o pontal superior a 3,0.
( ) a borda-livre mínima (valor mínimo) de embarcação “Não Solas” não poderá ser inferior a 100 mm, exceto em função da correção para a Posição da Linha de Convés.
( ) Na determinação do efeito de superfície livre, os tanques considerados no cálculo devem ser aqueles que possuam qualquer Momento de Superfície Livre a 30° de inclinação, quando com 70% de sua capacidade total.
( ) Embarcações de passageiros ou de carga, devem atender o seguinte critério de estabilidade: “A área sob a Curva de Estabilidade Estática compreendida entre os ângulos de inclinação de 0° a 30° não deverá ser inferior a 0.055 m.rad”.
( ) Embarcações de passageiros ou de carga, devem atender o seguinte critério de estabilidade: “A altura metacêntrica inicial não deve ser menor do que 0,15m”.
I) Time to reach the second execute yaw angle.
II) Overshoot yaw angle.
III) Overshoot width of path.
IV) Reach.
Which of the alternatives above are numerical measures of countermaneuvering ability and are indicative of the amount of anticipation required of a helmsman while operating in restricted waters?
Robert, following the “Principles of Naval Architecture”, was introduced to the results and theoretical studies of Professor Tuck. From his studies, Robert, achieved a value to describe the hydraulic force (squat´s force) acting on the ship proceeding in relatively narrow canal.
What is the alternative that is not important in a Tuck’s squat calculation, used by Robert?
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: