trust in our proven experience. be innovative.

The idea of electric motor gliding

The elfin is a brand new, highly innovative e-powered motor glider with hybrid propulsion option. 

It continues the success story of the legendary high-performance motor glider STEMME S10. The breakthrough inventions for the success of the STEMME S10 came from Dr. Reiner Stemme. He was the founder of STEMME AG and developed and built this wonderful glider with his team in Strausberg/Berlin during his time as managing director there. It was certified in 1990 by the LBA (German Luftfahrtbundesamt).

A highlight in its history was the successful mission »On Top of the World« in the Himalaya region using an underwing 3D camera system from DLR. We have the ambitious objective to continue this story in a new generation of planes; therein we rely on radical innovations. We cooperate with German research institutes and the industry - so we can best incorporate today’s knowledge in this project.

The elfin design ist a completely new development using state-of-the-art technology and does not base on the existing S10. GmbH is the current company of Dr. Reiner Stemme and not affiliated with STEMME AG.

Fly the new Reiner Stemme Class – side-by-side with e-power independent and safely

  • side-by-side cockpit in front of the wings with panoramic view and low sill for easy entry

  • retractable propeller system

  • directly coupled electric motor in fuselage nose

  • main battery in rear compartment for best mass balance

  • auxiliary battery behind cockpit at the center of gravity

  • specific wing airfoil 20e-143 without premature lift plateau, seamlessly optimized over the entire wing span

  • ambitious wing-to-fuselage-intersection design with fillets for drag reduction

  • turbulent root section airfoil and root twist

  • outer wings foldable to 10 m (33 ft) wingspan for taxiing and hangaring

  • inner wing lengthwise pivoting over fuselage for 11.5 m x 1.5 m (38 x 5.0 ft) overall footprint

  • enhanced safety through full ballistic parachute recovery system

  • certification EASA CS-22 and FAA equivalent. 

Maiden flight is planned for summer 2021. More than 10 aircraft are already sold.

elfin specification sheet





Wing span

65.6 ft

20 m

Wing area

266 sqft

16.2 m²

Wing aspect ratio



Length overall

28.5 f

8.7 m

Height over tail plane

5.6 ft

1.7 m

Wheel track

3.9 ft

1.2 m

Wheel base

18 ft

5.5 m

Cockpit width

4.1 ft

1.25 m

Cockpit height

3.2 ft

0.98 m

Cockpit entry sill height

2.82 ft

0.96 m


Operating empty weight

1,190 lbs

540 kg


1,984 lbs

900 kg

MTOW without water ballast

1,808 lbs

820 kg

Wing loading (min–max)

7.8–11.3 lbs/sqft

38–55.5 kg/m²

Max. cockpit loading

441 lbs

200 kg


Glide ratio

1 : 50 class

1 : 50 class


Never-exceed speed VNE

151 kts

280 km/h

Manoeuvring speed VA

108 kts

200 km/h

Stalling speed

42 kts

78 km/h

Range (elfin 20.e)

T-O to 1.600 ft
+ > 1h powered flight

T-O to 500 m
+ > 1h powered flight


Range (elfin 20.ex)

540 nm

1.000 km

Cruise (elfin 20.ex) @ FL100

116 kTAS

215 km/h