In the aerospace context, heavy-lift refers to the ability of an aircraft or launch vehicle to lift and transport large, heavy payloads such as satellites, space stations, or other large structures or equipment.
This includes the ability to carry payloads that are too large or heavy to be transported by standard aircraft or launch vehicles.
One example of heavy-lift in the aerospace context is the use of heavy-lift launch vehicles such as the Ariane 5, Delta IV Heavy, and Falcon Heavy, which are capable of lifting large satellites and other payloads into orbit. These launch vehicles have powerful engines and large payload fairings that allow them to lift and transport heavy payloads into space.
Another example is the use of heavy-lift aircraft such as the Antonov An-225 Mriya and the Boeing 747-8F, which are used to transport large and heavy cargo and equipment, including entire aircrafts and machinery, across long distances. These aircrafts have large fuselages and powerful engines that allow them to lift and transport heavy payloads.
Additionally, heavy-lift vehicles are also used for ground transportation of heavy items such as tanks, wind turbines, and large structures like bridges, oil rigs, and others. They are also used for the construction of offshore platforms, and for the installation of heavy equipment and structures in remote and difficult to access locations, like deep sea or polar regions.