ületõusu

"Uletõusu" is a term used in the context of aviation and aerospace engineering to describe the process of a rocket or spacecraft ascending through the Earth's atmosphere to reach orbit. This phase begins after the rocket has cleared the dense lower atmosphere and is characterized by the vehicle's engines operating in the vacuum of space. The term is derived from the Hungarian language, where "uletõusu" translates to "overcoming ascent."

During uletõusu, the rocket or spacecraft must overcome the effects of gravity and atmospheric drag, which decrease as altitude increases. This phase typically involves multiple stages of the rocket, with each stage jettisoning as its fuel is depleted. The final stage, or upper stage, carries the payload into orbit.

The uletõusu phase is critical for the success of a space mission, as it determines whether the payload can achieve the necessary velocity to enter orbit. Factors such as engine performance, fuel efficiency, and structural integrity of the vehicle are crucial during this phase. Once the uletõusu is complete, the spacecraft is said to have achieved orbital velocity and can begin its mission in space.