Stemme_S12 Knowpia

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)
Number built	>30
Developed from	Stemme S10

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]

Design and development edit

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]

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

^ Photos: U.S. Sport Aviation Expo 2017 (27 January 2017) Flying
^ "Aircraft Inquiry".
^ ^a ^b ^c ^d Grady, Mary (15 April 2015). "Stemme Debuts S12 Motorglider At Aero". AVweb. Retrieved 20 April 2015.