Correct spelling for the English word "VTOHL" is [vˈiːtˈə͡ʊl], [vˈiːtˈəʊl], [v_ˈiː_t_ˈəʊ_l] (IPA phonetic alphabet).
VTOHL stands for Vertical Takeoff and Horizontal Landing. It refers to a mode of aircraft operation where an aircraft is designed and capable of taking off and landing in a vertical orientation, while still being able to transition and operate in a horizontal position during normal flight. This mode of operation is commonly associated with certain types of aircraft such as helicopters, tiltrotors, and vertical and short takeoff and landing (V/STOL) aircraft.
During vertical takeoff, the aircraft's engines or propellers generate enough lift to allow the aircraft to rise vertically from the ground or a platform. This eliminates the need for long runways, making it possible to operate in confined spaces or areas with limited infrastructure. By using vertical takeoff, aircraft can be deployed in a wider range of environments, including urban areas or rugged terrain.
Once airborne, the aircraft can transition into a horizontal flight mode, where it operates like a conventional airplane. This allows the aircraft to achieve greater fuel efficiency and higher speeds compared to vertical takeoff alone. During horizontal landing, the aircraft gradually reduces speed and altitude, transitioning from a horizontal to a vertical orientation in order to safely land.
VTOHL capability provides increased flexibility and versatility in aircraft operations, enabling access to areas with limited infrastructure, increased maneuverability, and the ability to perform missions that require vertical or short takeoff and landing capabilities.