[Oil moving ship model] Oil moving ship model introduction shopping guide oil moving ship model hot product recommendation

October 04, 2023

[Oil moving ship model] Introduction to oil moving ship model

The maritime performance of a ship mainly includes: being able to load a specified amount of load and floating on the water; when subjected to wind and waves, and passengers, when the cargo moves on the ship, the ship has a certain inclination without tipping; when external force acts When it disappears, the ship has the ability to return to its original floating state.

Ships can still remain unsinkable when they are hit by rocks, collisions, or attacks from enemies to damage. Should have higher speed and consume less machine power. Have good heading stability and sensitivity. When sailing on rough seas, there is no violent sway to avoid the crew, the passengers getting seasick and obstructing the normal operation of the ship's machinery and equipment and the accurate launch of the weapon.

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■ Water resistance when the oil boat is sailing

The water resistance of the ship model is usually divided into the following categories:

Frictional resistance: Water is a viscous liquid. When a ship sails, it must overcome the resistance caused by the viscosity of water. This resistance is called frictional resistance. The magnitude of the frictional resistance is related to the wet surface area of the hull soaked, the relative speed of the ship and the water, and the surface roughness of the hull.

(1) Wave resistance: When the ship is driving, the bow of the ship exerts pressure on the water, and the water is opened and moved forward, thus igniting a group of waves moving along with the ship. This is the first wave. As the stern progresses, a low-pressure zone is created in the water, becoming a trough, forming a set of waves caused by the stern, called the wake. The waves also consume energy, called the wave resistance. Because it is caused by the pressure change of water, it is also called pressure resistance.

(2) The wave resistance is related to the speed of the ship's length. The higher the speed of the ship, the greater the resistance to the wave. In order to reduce this resistance, the streamline below the ship's waterline is made into a bulbous streamline type, and the low pressure formed by the spherical portion is used to reduce the height of the first wave, thereby reducing the wave resistance. This is an economical and effective way to increase the speed of the ship.

(3) Vortex resistance: When a ship sails, the vortex formed by the water passing through the tail of the ship absorbs the energy of the ship and hinders the advancement of the ship. This is the vortex resistance. Try to design the hull into a streamline type, paying special attention to the rationality of the rear and tail body types, which can reduce the vortex resistance.

Ships sailing on the sea will also be subject to other resistances, such as air resistance and resistance to the waves. The total resistance of the ship is the sum of the above three resistances, namely: total resistance = friction resistance + wave resistance + vortex resistance.

The product of the total ship's resistance obtained by the model test and the speed required by the ship is the power to overcome the water resistance. If you know the efficiency of the ship's powerplants and propellers, you can determine how large the ship should be installed.