船模制作流程（Ship model making process）.doc

船模制作流程（Ship model making process） Ship model making tutorial I. Theoretical Knowledge First, the ships marine performance The ships navigational performance mainly consists of: 1. capable of carrying a specified amount of load and floating on the surface of water; 2. when the storm, and the passenger, cargo moving in ships, ships only have a certain tilt without overturning force; when the ship has disappeared, restore to the original state of the floating ability. 3., when a ship is hit by a rock, a collision or an enemy attack and damage, it can remain unsinkable 4. should have higher speed and less power consumption of the machine 5., good course stability and sensitivity 6. when navigating on rough seas, there is no violent swing to avoid seasickness and obstruction to the normal operation of the ships machinery and equipment, as well as the accurate launching of weapons (I) floating The ship is subjected to water pressure in the water. The pressure between the two sides of the ship is balanced with each other, and the pressure at the bottom of the ship is balanced with the weight of the ship itself The balance condition of ship is: 1. gravity P and buoyancy D act on the same vertical line; 2. displacement equals the total weight of the ship, P=D (two) stability If the ship is tilted by the external force, the gravity and the buoyancy force form a moment that causes the ship to return to its original floating position, and the ship is stable and balanced How to make the ship have good stability? 1., the center of gravity of the ship should be reduced as much as possible; 2. increase the breadth; 3. maintain a certain freeboard. But the word is too large, low center of gravity of the ship, between gravity and buoyancy line distance greatly, thus forming the restoring torque is large, so the swing frequency is higher in the sea around the roaring waves, unfavorable to the staff and equipment operation. (three) rapidity; The water resistance of a ship is usually di