Ship hull shape with low bow stern resistance
【Hull left image】
■Comparison table of ship form
|Types of ship form||high speed||Fuel economy||Rough seas||Shaking||Price of ship||Loading capacity||Number of voyages|
|Normal ship (mono hull)||X||◯||◯||△||◎||◎||△|
|through hull ship (kurokiship)||◎||◎||◎||◎||◯||◯||◎|
KurokiShip is a hull shape with less resistance to water at the bow stern. The shape of the hull which raises the water in front of the bow to the water channel in the ship and flows to the stern, the tip of the bow stern can be made sharp and sharp. Due to the sharp shape, the resistance of water at the bow stern decreases.
The current ship has its bow portion over both sides, and as soon as boat speed is raised, the water in front of the bow will be pushed out of the sides of both bowls with great acceleration, and the resistance of water goes up rapidly .
■Floor shape (waterway floor)
【Floor shape (waterway floor) 】
KurokiShip has a waterway inside the hull that flushes the water in front of the bow to the stern. Build with a floor shape to lift and lower the water with the acceleration of 1 G at the cruising speed. At cruising speed, water resistance is low even at high speeds, and navigation can be performed efficiently (optimizing the floor shape at cruising speed, so fuel efficiency is poor at other than cruising speed). Since the current ship is not a hull shape optimized for the cruising speed (decide the cruising speed according to arrival time), increasing the speed suddenly increases the resistance of water and the fuel consumption suddenly deteriorates.
Both sides of KurokiShip are very thin and long. Both sides are structures that support the upper structure by the lower structure, and unlike the catamaran that has the role of buoyancy, the width can be narrowed to the extent that the strength can be secured. Also, unlike a mono hull vessel which has the role of a luggage compartment, the tip of the bow stern can be formed into an elongated and sharp shape, and resistance by lateral movement of water can be reduced.
■Bow stern shape
【Shape of bow and stern】
The bow stern of KurokiShip has sharp tips on both the lower and both sides, and unlike a monohull ship with a thick stern, the acceleration to move water is small, and as a result the resistance of water is low. The water channel floor on the lower surface that lifts water is constructed in a floor shape with an acceleration of 1 G at normal speed (cruising speed), so resistance of water does not increase even at high speed. The monohull ship keeps its fat shape and speeds up, so the resistance of water rapidly increases at high speed.
■Cargo room shape
【Cargo room shape】
The cargo compartment of KurokiShip is located far above the surface of the water. A space provided above and below the wave is necessary on the water surface flowing through the waterway floor in the ship, and the wave does not hit the bottom of the cargo room due to this space (it is necessary to secure the height of the space that does not collide) is there). Since the cargo compartment is rectangular parallelepiped and the bottom is not rounded and curved, cargo can be loaded in order. At high speed, resistance of air is large and it can not be ignored, and there is also a role of preventing part of the baggage from being blown off, so the cargo compartment covers all six sides.
Place the steering room (bridge) at the head of the cargo hold. Like the track on the track, placing the steering room on the bow makes it easier for the other ships to be seen nearby and to navigate easily. In the current ship, placing the steering room or the residential room on the bow leads to poor living environment by pitching and punching, so it is often arranged at the stern. Since KurokiShip without pitching and punching has no restriction, it can be placed in the bow portion.