Stemme S12

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
Role Motor glider
National origin Germany
Manufacturer Stemme
First flight April 2015
Introduction April 2015
Status Under development (2015)
In production (2017)[1]
Number built >30[2]
Unit cost
€300,000 (2015)
Developed from Stemme S10

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]

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
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See also

References
  1. Photos: U.S. Sport Aviation Expo 2017 (27 January 2017) Flying
  2. https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=11SK. Missing or empty |title= (help)
  3. Grady, Mary (15 April 2015). "Stemme Debuts S12 Motorglider At Aero". AVweb. Retrieved 20 April 2015.
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