Glider • Stemme • S12, S12-B, S12-E
| Manufacturer | Stemme |
| Model | S12 |
| Category | Glider |
| Variants | S12, S12-B, S12-E |
| Production Years | 1981 – 2012 |
| Seating | 2 seats |
| Typical TTAF | 2,800 hours |
| Markets | Germany, France, United Kingdom, United States, Switzerland |
| Price Range | $85K – $280K |
The Stemme S12 is a high-performance motorized glider designed for cross-country soaring and personal transport. Manufactured by Stemme AG, a German aircraft company renowned for innovative glider designs, the S12 combines the efficiency of modern sailplane aerodynamics with a retractable auxiliary engine system. This aircraft is particularly suited for pilots seeking extended endurance, the ability to climb to altitude independently, and the versatility to operate from small airfields. The S12 features excellent glide characteristics, allowing extended flights even with the engine retracted. The retractable Rotax engine provides auxiliary power for sustained climb and extended range capabilities. Primary users include recreational pilots, cross-country soaring enthusiasts, and flying clubs. The aircraft is valued for its efficiency, elegant design, and the freedom it provides to undertake ambitious soaring missions without complete dependence on thermal activity. The S12 represents a significant advancement in motorglider technology, offering performance approaching pure sailplanes while maintaining practical self-launching capability.
Maximum Speed: 220 km/h (119 knots)
Cruise Speed: 140 km/h (76 knots)
Maximum Range: 1,200 km (estimated with engine)
Service Ceiling: 5,500 m (18,040 ft)
Engine: Rotax 503 (2-cylinder, 2-stroke, 27 kW)
Maximum Takeoff Weight: 550 kg (1,213 lbs)
Empty Weight: 360 kg (794 lbs)
Glide Ratio: 30:1 (approximately)
Wing Area: 10.8 m²
Wingspan: 15.6 m