What are the advantages and disadvantages of the backward bow of the American DDG 1000 destroyer?

That's called wave-piercing bow, which cooperates with the inward inclined hull to form an inclined ship form in the wave-piercing monomer.

Advantages:

1. Powerful stealth performance

In most warships, the bow and side of the ship usually float outward or vertically to increase the deck area and hull volume, so that the hull can be more immersed in the water when shaking, and gain greater buoyancy to reduce shaking.

However, the outer floating type will form an acute angle with the water surface, and the concave acute angle has the strongest reflection on radar waves and has a great influence on stealth performance. Therefore, modern warships, especially those considering stealth performance, usually carry out certain treatment to minimize this situation.

Wave-piercing bow combined with inner floating dry string can effectively reduce radar wave reflection along the original path and enhance stealth performance.

2. Good longitudinal stability

The common bow is to guide the waves aroused during sailing to both sides of the ship to avoid flooding the deck or hitting the swollen freeboard, so the bow will move up and down with the waves, and the longitudinal movement of the hull will be fierce. ?

Wave bow can penetrate waves without being affected by wave fluctuation. On the one hand, it reduces the longitudinal sway amplitude of the ship in high sea conditions, on the other hand, it also ensures the speed in high sea conditions, thus providing a reliable platform for the main weapon AGS gun DDG- 1000.

Disadvantages:

1. Internal space reduction

Compared with other types of ships, the internal space of the bow-piercing and inward-tilting hull is obviously reduced, which has a great influence on the livability. Although it can be solved by reducing the crew by a high degree of automation, it is more important to reduce the deck area where weapons can be arranged at the same time, so that such a huge ship does not carry as many missiles as the Alibek class, and the AGS gun is also questioned. No wonder the US military turned its attention to Ali Baker III.

2. The overall stability and seaworthiness are questionable.

Although DDG 1000 advertises stability and seaworthiness, from the results of model test, there seems to be a problem with high sea conditions.

The problem of waves passing through the bow is more serious, because there is no floating freeboard like the flying shear bow to stop the waves, and the waves split by the bow can completely rush to the hull, which will impact the bridge in serious cases.

The pool test shows that the wave and wake generated by DDG- 1000 at the speed of 30 knots are smaller than those of the traditional flying shear bow, which is beneficial to reducing navigation resistance, and the smaller wake can also reduce the risk of being discovered by the enemy and attacked by wake homing torpedoes.

However, under high sea conditions (wave height is 6.7-9. 1m, and sea conditions are 6-7), the propeller and rudder jump out of the water, which reduces the effectiveness of the propulsion system and the maneuverability of the ship, indicating that the wave-crossing bow can not effectively contain the influence of waves.

Moreover, crossing the bow and tilting the hull will cause the center of buoyancy to be lower than the center of gravity (in order to ensure the normal work of some electronic equipment, such as low-altitude detection radar, a superstructure must be high enough), and the lateral stability will be poor, just because the center of gravity of ordinary warships is lower than the center of buoyancy.

Moreover, the upper structure of high-rise buildings leads to large wind load, which is more likely to tumble and overturn under the action of wind and waves, so more ballast is needed to maintain stability.