motorglider

Motorglider is an aircraft designed to combine the soaring capabilities of a glider with the propulsion of a powered aircraft. It is optimized for efficient unpowered flight with a high aspect ratio wing and light structure, allowing extended gliding and cross-country flight once the engine is shut down. The propulsion system can be used to launch and climb, or to sustain powered flight for additional range or during poor soaring conditions.

Two main configurations exist: self-launching motorgliders, which carry an engine and retractable propeller to enable takeoff and initial climb before the propeller is retracted for gliding; and non-self-launching motorgliders, where the engine is used only to extend flight after release from tow or winch but is not intended for launch. Many use piston engines or electric motors, with multiple gear arrangements and nose- or behind-cockpit propulsion; retractable propellers are common to reduce drag in gliding mode.

During soaring, motorgliders behave like conventional sailplanes and achieve glide ratios similar to other high-performance gliders. In powered flight they may cruise at modest speeds; overall performance depends on wing design, weight, and engine installation. They are used for recreational cross-country flying, flight training, and research; some models serve as light sport or demonstration aircraft. Regulations usually require engine usage to be minimized or shut down during soaring and limit engine operations during certain airspace.

Commercial manufacturers such as Grob Aircraft, DG Flugzeugbau, Schleicher, and Schempp-Hirth produce motorgliders and self-launching gliders, along with electric and hybrid variants from other firms. The category continues to evolve with advances in lightweight propulsion, aerodynamics, and materials.