Stemme S12
# 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
