Knowledge of the space shuttle and underwater aircraft

In terms of flight principle, underwater vehicles are very similar to ordinary aircraft. Ordinary planes fly up and down in the air by aerodynamic forces generated by wings. The "underwater plane" uses the hydrodynamic force generated by the relative movement of the short wings on both sides with the sea water to push forward while sinking or floating. At present, the "underwater plane" has been unmanned. As for whether it can carry people, scientists have conducted research and demonstration. Finally, they think that if a "life support system" similar to that used by astronauts or divers is added to the "underwater plane", it can completely carry people, but the corresponding cost will increase greatly.

The space shuttle is a reusable aircraft that transports people and goods between the earth's surface and near-earth orbit. When it is in orbit, it can complete a variety of tasks with the cooperation of airborne payload and crew. The space shuttle is usually designed as a rocket-propelled plane. When it returns to the ground, it can glide and land like a glider or an airplane.