Stem S12

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Stemme S12 Twin Voyager
Stemme S12 glider, exhibited at AERO Friedrichshafen 2016
Type: Motor sailer
Design country:

GermanyGermany Germany

Manufacturer:

Stemme

First flight:

Spring 2015

The Stemme S12 is a variant of the S10. It is a two-seat motorized glider made by the German manufacturer Stemme AG . The first flight took place in the spring of 2015 at Strausberg airfield , the EASA CS-22 certification in March 2016 and the FAA on August 17, 2017.

construction

Cockpit S12-G

The two-seater cantilevered wing monoplane in FRP construction with conventional T-tail has a 25 meters or 21.7 m exciting five-wing with wing flaps , Schempp-Hirth airbrakes on the top and winglets . The outer wings can be folded onto the fuselage for hangar .

The modified Rotax 914 motor, located in the fuselage behind the cockpit, drives a 2-bladed folding propeller (propeller circle diameter: 1.63 m) via a CFRP remote shaft, which can be retracted under the longitudinally adjustable aerodynamic front fairing when not in use.

Compared to the S10 , the outer wing has been re- profiled , enlarged and provided with 60 l fuel tanks each. There are clip-on wings with a span of 25 m and 21.7 m, both with winglets. The rudder unit has been enlarged and holds a 15 liter water ballast tank. The electrically retractable landing gear has been reinforced for the increased maximum take-off weight and the track width has been increased. There is also an electric elevator trim and an externally accessible luggage compartment for 20 kg on the back of the fuselage. In addition, a Dynon autopilot was implemented, which makes the S12 the first approved glider with an autopilot .

The S12-G equipment variant with a Garmin G3X glass cockpit with two 7-inch screens, integrated autopilot and LX9000 has been available since 2019.

Technical specifications

Opened gap for the two-bladed folding propeller
Parameter Data
crew 1-2
span 25.07 m 21.7 m
Wingspan (folded) 11.40 m
Hull length 8.42 m
height 1.75 m
Trunk width 1.18 m
Wing area 19.95 m² 18.6 m²
medium chord 0.74 m
Wing extension 31.5 25.3
Wing profile HQ 41 (inner wing)
Glide ratio 53 50
Slightest sinking
Empty mass ~ 690 kg ~ 680 kg
Max. Water ballast 15 l in the fin
Max. Fuel quantity 120 l in the middle wing
Max. Takeoff mass 900 kg
Max. Wing loading 45 kg / m² 49 kg / m²
Engine Rotax 914 F2 / S1 , 115  PS (85  kW )
Top speed 270 km / h
Service ceiling 9100 m
Range 1600 km

Comparable types

Related developments

See also

Web links

Commons : Stemme S12  - collection of images, videos and audio files

Individual evidence

  1. ^ Mary Grady: Stemme Debuts S12 Motorglider At Aero. In: avweb.com. April 17, 2015, accessed April 24, 2016 .
  2. ↑ a b c d Type approval Stemme S10 - EASA-TCDS-A.054 (edition 4). (PDF; 500 kB) (No longer available online.) EASA, October 20, 2017, archived from the original on April 24, 2016 ; accessed on May 3, 2018 .
  3. ↑ FAA certificate for Stemme S12. In: stemme.com. Retrieved on October 10, 2017 (English): "... has successfully passed the FAA validation process of the EASA type approval, and received the official type certificate G06CE."
  4. ↑ a b c d e S12. In: stemme.com. Retrieved October 10, 2017 .
  5. ↑ a b c Gerhard Marzinzik: With the S12 in the open class. In: aerokurier . April 15, 2015, accessed October 10, 2017 .
  6. ↑ a b c d e f g h Markus Lewandowski: Stemme S12 . In: Patrick Gabler (Ed.): Gliding . No. 6 . Gabler Media, Bilten (Switzerland) October 2016, p. 9 .
  7. ↑ S12-G. In: www.stemme.com. Retrieved May 5, 2020 .