Stemme S12
German touring motor glider, 2015
From Wikipedia, the free encyclopedia
The Stemme S12 is a German high-wing, two-seat motor glider produced by Stemme of Strausberg. It was introduced at AERO Friedrichshafen in April 2015, shortly after its first flight.[3]
| S12 Twin Voyager | |
|---|---|
| Stemme S12 at AERO 2016 | |
| General information | |
| Type | Motor glider |
| National origin | Germany |
| Manufacturer | Stemme |
| Status | Under development (2015) In production (2017)[1] |
| Number built | >30[2] |
| History | |
| Introduction date | April 2015 |
| First flight | April 2015 |
| Developed from | Stemme S10 |
| Variant | Dzyne ULTRA |
Design and development
Based in the Stemme S10, the Stemme S12 features a cantilever wing, a T-tail, a two-seats-in-side-by-side configuration enclosed cockpit under a bubble canopy and a single engine with a retractable propeller.[3]
The aircraft is made from composite material. Its 25 m (82.0 ft) span wing employs winglets. The mid-fuselage-mounted engine is the 115 hp (86 kW) Rotax 914 F2/S1 four-stroke turbocharged powerplant driving a retractable, folding, variable-pitch propeller. Its maximum glide ratio is 53:1.[3]
The $8 million Dzyne Unmanned Long-Endurance Tactical Reconnaissance Aircraft (ULTRA) is an uncrewed derivative deployed as part of an affordable ultra-long endurance ISR demonstration, capable of flights up to 80 hours.[4]
Specifications (S12)
Data from Grady[3]
General characteristics
- Crew: one
- Capacity: one passenger
- Length: 8.42 m (27 ft 7 in) (propeller retracted)
- Wingspan: 25.0 m (82 ft 0 in) - 11.4 m (37.4 ft) span when folded
- Height: 1.75 m (5 ft 9 in)
- Wing area: 19.95 m2 (214.7 sq ft)
- Aspect ratio: 31.33
- Gross weight: 900 kg (1,984 lb) MTOW
- Fuel capacity: 120 litres (26 imp gal; 32 US gal)
- Powerplant: 1 × Rotax 914 F2/S1 four cylinder, liquid and air-cooled, turbocharged, four stroke aircraft engine, 86 kW (115 hp)
- Propellers: two-bladed retractable, folding, variable-pitch propeller
Performance
- Maximum speed: 259 km/h (161 mph, 140 kn) at 10,000 feet MSL
- Cruise speed: 230 km/h (140 mph, 120 kn)
- Range: 1,759 km (1,093 mi, 950 nmi)
- Endurance: 9.2 hr @ 55% power
- Maximum glide ratio: 53:1
- Rate of climb: 4.21 m/s (829 ft/min)
- Wing loading: 45.11 kg/m2 (9.24 lb/sq ft) at MTOW
