title: Stemme S12
text: # 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.
  
  ## 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.
  
  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.
  
  ## Specifications (S12)
  
  Data from Grady
  
  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 $m^2$ (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 $kg/m^2$ (9.24 lb/sq ft) at MTOW
  