As the name stands for a plane that converts, but exactly in what? First of all, the plane needs to take off vertically and landing as well, so it is VTOL (Vertical take-off and landing), specifically using a rotor, and in a normal regime fly like a fixed-wing aircraft. This is a definition from the Fédération Aéronautique Internationale (FAI).
![](https://i0.wp.com/topwar.ru/uploads/posts/2020-02/1581498079_2189517e22b7567760f4ea58f3cf6bb1.jpg?w=640&ssl=1)
The most common aircraft configuration in this category is the proprotor, its rotor blades for vertical take-off become propellers for horizontal flight. There are two main types of proprotor, tilt-rotor and tilt-wing. Therefore, the difference lies in the mechanism to divert the propulsion along the wing.
![](https://upload.wikimedia.org/wikipedia/commons/6/6d/Vertol_VZ-2_%28Model_76%29_NASA_GPN-2000-001732.jpg)
An example of a Tilt rotor is The Bell Boeing V-22 Osprey Military, with two engines, the rotors work as a helicopter rotor for taking off vertically and then in flight they lean forward similar to an airplane. Within this type, the AgustaWestland AW609, a civilian aircraft with outstanding flight performance.
On the other hand, in the Tilt wing aircraft, the system works in such a way that the whole system rotates (the engine and the wing) simultaneously. An example of this aircraft, the Vertol VZ-2 or Hiller X-18.
![](https://upload.wikimedia.org/wikipedia/commons/b/bb/Hiller_X-18_testplatformLarge.jpg)
The convertiplane seems to be a versatile aircraft for many environments since it can be operated in a heliport and airport, has a high top speed due to the horizontal tilt configuration, and the maneuverability needed in different places.
References:
https://www.popularmechanics.com/
Cover photo:
Peter Gronemann/commons.wikimedia.org
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