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- Added: October 21, 2025
- Updated: October 29, 2025
The Stemme S12-G comes with the following liveries: USA, Germany, Pioneer.
The Stemme S12-G comes with the following liveries: USA, Germany, Pioneer.
The S12-G is a next-generation motorized sailplane developed and manufactured by German glider producer Stemme. The two-seat aircraft is a functional hybrid of a high-performance soaring glider and a motorized touring airplane. The S12-G is the “Grand Tourer” version of the S12.
Motorgliders provide pilots the ability to soar through the sky using natural lift and the freedom to launch without need of a tow airplane or winch. These hybrid aircraft also provide the safety of onboard power if mid-flight circumstances require it. Engineers attempted creating motorgliders as early as the 1920s with the first production models appearing in the 1940s. Developing these craft proved complex and required significant compromise. As sailplanes, motorgliders suffered due to increased weight of engines and drag of propellers; as motorized aircraft, they lacked range and sufficient power.
In 1984, German engineer Dr. Reiner Stemme founded the company Stemme to create a next-generation motorglider. He envisioned one that would perform both sailplane and motor touring roles without compromise. He set out to create an aircraft that embodied the spirit of “Wandersegelflug.” This was a concept developed in Germany in the 1920s and 1030s where glider pilots sought to roam the skies on cross-country flights kept aloft by natural air currents. Dr. Stemme’s first model was the Stemme S10, a breakthrough design combining a high-performance sailplane with a robust propulsion system that added virtually no aerodynamic drag when not in use.
The S10, which took its first flight in 1986, features a turbocharged 4-cylinder piston engine that is mounted behind the cockpit near the aircraft’s center of gravity. The engine is connected to a nose-mounted propeller that can fully retract when not in use. The S10’s retractable traditional undercarriage allows it to maneuver on the ground and self-launch. In the air, its 50:1 glide ratio allows pilots to soar for hours on cross-country flights. Stemme developed the S12 after years of study of the S10’s performance and feedback from pilots. This included test flights in South America where the S10 flew as high as 41,000 feet above sea level on mountain wave lift. The S12 took its maiden flight in early 2015 and was introduced a few months later in April.
The S12-G, introduced in 2018, is the grand tourer variant of the S12 and sets a new standard for long-distance motorglider performance. It features all-composite construction, side-by-side cockpit seating, a retractable standard undercarriage, and a T-tail empennage. Based on decades of experience with the S10, Stemme developed one of the most advanced main wings ever created for soaring aircraft for the S12 and S12-G. It is a foldable, high-aspect-ratio design with winglets that is optimized for high-performance, long-distance flight in all types of lift conditions.
The S12-G is powered by a turbocharged, 4-cylinder Rotax 914 F2/S1 piston engine that generates up to 113 horsepower for take-off and emergency situations and up to 98 horsepower for continuous operation. The engine is mounted mid-fuselage, behind the cockpit, and is connected to the aircraft’s fully retractable, variable-pitch propeller via a shaft.
In the cockpit of the Stemme S12-G, pilots are treated to Garmin G3X avionics with dual Garmin G3X Touch integrated flight display units. These provide a full spectrum of critical information, including flight information, navigation information, and engine diagnostics. The aircraft also includes an autopilot and a LX9000 soaring computer. Power for the motorglider’s avionics and external LED navigation lighting is supplied by either the engine or onboard solar panels and stored in high-capacity batteries.
The S12-G measures 27 feet, 6 inches in length and has a wingspan of 82 feet with an aspect ratio of 31.33. It has a powered cruising range of 1,093 miles, a powered cruising speed of 140 miles per hour, and a maximum powered cruising speed of 161 mph. Under power, it climbs at up to 829 feet per minute. With a glide ratio of 1:53, the S12-G allows pilots to maximize all forms of natural lift, including thermals, ridge lift, hybrid thermal-ridge lift, mountain wave soaring, and gravity wave soaring.
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