Modern large ships are built using the segmented modular construction method. That is, the construction of a large ship is divided into many segments and modules. These segments and modules are built in different workshops or places at the same time. Finally, they are assembled in a dry dock. It maximizes efficiency and compresses the total construction time.
The data of the dry dock determines the data of the ship to be built. Its maximum size determines the maximum size of the buildable ship; its dock depth and load capacity determines the maximum tonnage of the buildable ship.
And the maximum lifting capacity of gantry crane determines its construction efficiency and maximum tonnage. It directly affects the total number of segments and modules of a large ship and the weight of each segment and module. When the weight of the module that can not be split exceeds the maximum lifting capacity of the gantry crane, it will not be able to continue to build.
Large military ships, usually use multiple main engines of smaller size. For safety consideration, they are usually arranged separately in different engine compartments. For example, the Queen Elizabeth class carriers use two MT30 gas turbines as main engines. The weight of a single engine is only 22T.
The islands of the Queen Elizabeth class carriers are built as a whole and then lifted and installed on the deck of the carrier. Of course, we can split it into smaller modules to reduce the weight, but the construction time will be longer.
Large cargo ships are much larger in tonnage, and they also usually use a more economical power scheme. They usually use a combination of one main engine and several generators. And these main engines have huge weight (e.g. RT-flex96C engine weighs 2300T). Even if you take these engines apart, its main shaft is hundreds of tons.
We know that no matter what government or business, they exaggerate their capabilities many times. This has nothing to do with China or India, in fact, it happens to all governments or businesses around the globe. If we analyze deeply based on some basic logic, we can more accurately make some predictions and judgments in advance.
