RS.aero elfin 20.e

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REINER STEMME elfin 20.e
RS10e elfin model AERO Friedrichshafen 2017-04-05.jpg
elfin 20.e model at AERO 2017
Type: Electric hybrid - glider
Design country:

Germany Federal RepublicFederal Republic of Germany BR Germany

Manufacturer:

RS.aero GmbH

First flight:

planned March 2019

The RS.aero elfin 20.e is a two-seat self-launching electric hybrid - glider German ReinerStemme.aero GmbH, whose development began in 2016 when Reiner Stemme Utility Air Systems GmbH (RS-UAS).

history

On the AERO in Friedrichshafen in April 2016, the project of a within the aviation research program LuFo V of was BMWi developed by RS-UAS electric motor glider presented that in the self-launch is expected to reach a height of 500 meters and hour electric motor-driven flight.

The aircraft at Schönhagen airfield is mainly designed by Akaflieg members. The development and construction of two prototypes should be completed in the fourth quarter of 2018. The first flight was planned for March 2019, the start of delivery for 2019 at a price of € 250,000. [outdated]

construction

The cell of the construction and authorization procedure according to EASA CS-22 developed aircraft is in CFK - half shell construction using prepregs made. The cantilevered two-seater shoulder wing has a conventional T-tail unit and a 20 meter three-part wing with flaperons . The slightly negative swept 9.90 m wide center wing has at the top two-storey Schempp-Hirth airbrakes . The double trapezoidal outer wings with winglets , each measuring 5.10 m and weighing less than 30 kg, can be folded onto the tail girder similar to the Stemme S10 / S12 so that the span can be reduced to 11.05 m for easier rolling and hangaring . Alternatively, the inner wing can be rotated 90 ° with the outer wing removed and stored on the fuselage so that the hangar area is 9 × 2 m.

The outer wing, as well as the middle wing with one of the five variants of the self-developed profile 20e-143, were developed in cooperation with Windward Performance . The flap position is automatically adjusted depending on the flight speed.

The fuselage consists of a CFRP sandwich shell with four stringers . The main landing gear, which can be retracted electrically backwards into the fuselage and has a 1.20 m track width, has sprung, brakable single wheels 5.00-5; the tail wheel with an outer diameter of 210 mm is controllable and electrically retractable into the fin. The crew sits next to each other in a semi- monocoque with double steering . The forward-opening cockpit hood has integrated gas pressure springs and can be thrown off in an emergency using a central handle in the instrument panel, a Röger hook is available.

In addition to self launch, winch and aircraft tow launch are also possible. Fasteners for two oxygen bottles are available in the cockpit rear wall. A total rescue system or an ELT are optionally available.

drive

The drive concept was developed in cooperation with the Aviation Technology Department of the TH Wildau and the “Corporate Technology” department of Siemens AG; the geometry of the three-bladed folding propeller at Steinbeis Flugzeug- und Leichtbau GmbH Stuttgart was optimized. An 80 kW Siemens SP70D electric motor in the bow of the fuselage directly drives the propeller with a propeller diameter of 1.65 m. For the glider configuration , the propeller is folded according to the system developed and patented by Reiner Stemme and stowed under the aerodynamic front fairing that can be moved in the longitudinal direction. The width of the gap that can be closed by an electric motor is 50 mm (S10: 115 mm).

Two 400 V battery packs, each weighing 60 kg and consisting of three modules of cylindrical Li-ion cells from Samsung , with a total nominal capacity of 21 kWh, are located in the rear part of the fuselage at the beginning of the tail unit. A battery pack can be removed through a flap in the back of the fuselage so that the 180 kg water load can optionally be used for competitive gliding. The battery management system and a 12 V rectifier are located behind the wing connector.

The 30 kg heavy motor is mounted with vibration damping. The engine control unit and a cooler with about 5 kW cooling capacity are located under the rudder pedals. Cooling air flaps and propeller dome are moved automatically. Thanks to a combination of an internal combustion engine and a 50 kW three-phase generator , which can be used to charge the batteries during the flight, the aircraft can be used as a touring motor glider. This 65 kg “ range extender ” can be mounted on a pylon under the right wing; a 90 kg fuel tank is located in the center wing.

Versions

  • elfin 20.e - competition glider FAI - seater class , self-bootable by 80- kW -Elektromotor, 1 h electric powered flight
  • elfin 20.ex - touring motor glider with " range extender " under hydrofoil pylon

Technical specifications

Full-scale mock-up of the front fuselage at AERO 2017
Parameter Data elfin 20.e
crew 1 + 1 (side by side)
overall length 8.7 m
span 20 m (external areas for hangar when folded: 11.05 m)
Tail height 1.70 m
Gauge 1.20 m
wheelbase 5.50 m
Cockpit width 1.25 m
Cockpit height 0.98 m
Entry height 0.96 m
Wing area 16.2 m²
Wing extension 24.7
Wing profile 20e-143
Glide ratio 48
Slightest sinking
Empty mass 540 kg (570 kg with total rescue system)
Max. Water ballast 150 kg
Payload Max. 200 kg in the cockpit + 20 kg in the luggage compartment
Max. Takeoff mass 900 kg (820 kg without water ballast)
Wing loading 38–55.5 kg / m²
elfin 20.ex : 42–50.6 kg / m²
Cruising speed elfin 20.ex : 215  km / h (116  kn ) in FL 100 (≈3000 m)
Maneuver speed 210 km / h (approx. 110 kn)
Top speed 288 km / h (approx. 160 kn)
Minimum speed 78 km / h (approx. 40 kn)
Climb performance 3 m / s
Range Start / climb at 500 m and 1 hour electric motor
flight elfin 20.ex : 1,000  km (540  NM ) at 185 km / h (100 kn)
Engines 1 × electric motor Siemens SP70D
(80 kW starting power, 70 kW continuous power )
Auxiliary power unit (optional) 1 × Wankel 35 kW generator from Geiger on the wing pylon,
90 kg fuel tank in the center wing

Comparable types

See also

Web links

Individual evidence

  1. ↑ a b c d e f g Reiner Stemme: Company News . In: ReinerStemme.aero GmbH (Ed.): Elfin news . No. 01/2018 , April 2018 (English).
  2. ^ A b Elfin Project: Company. ReinerStemme.aero GmbH, 2018, accessed on June 1, 2018 .
  3. ↑ a b c d e f g elfin RS10.e. (PDF; 12.4 MB) In: dev.elfinproject.com. ReinerStemme.aero GmbH, April 2018, accessed on April 16, 2018 .
  4. ↑ a b Gerhard Marzinzik: Reiner Stemme presents electric motor gliders . New Stemme family of gliders. aerokurier , April 20, 2016, accessed June 19, 2018 .
  5. ↑ a b Frequently Asked Questions (FAQ). In: zedia-aviation.com. Zedia-Aviation GmbH - Europavertrieb der elfin 20.e, April 2018, accessed on October 31, 2018 .
  6. ↑ a b c newsletter for elfin customers and friends. (PDF; 2.9 MB) 3/2018. In: reinerstemme.aero. October 2018, accessed October 31, 2018 .
  7. ↑ a b First flight at the end of the year. In: aerokurier.de. April 19, 2018. Retrieved April 19, 2018 .
  8. ↑ a b c d elfin RS10.e - Specifications. (PDF; 620 kB) In: dev.elfinproject.com. ReinerStemme.aero GmbH, April 2018, accessed on April 16, 2018 (English).
  9. ↑ a b Reiner Stemme: ELFIN NEWS for customers and enthusiasts . Ed .: RS-UAS GmbH. March 2017 (English).
  10. ↑ development. In: zedia-aviation.com. Zedia-Aviation GmbH - European sales of elfin 20.e, April 2018, accessed on June 19, 2018 .
  11. ↑ Option list. (PDF; 65 kB) In: reinerstemme.aero. ReinerStemme.aero GmbH, July 2018, accessed on July 31, 2018 .
  12. ↑ a b Gerhard Marzinzik: Aircraft Report: Stemme RS10.e elfin - masterpiece . In: aerokurier . No. 6 , 2017 ( aerokurier.de [accessed June 19, 2018]).
  13. ↑ a b A big step forward with our new propeller design. (PDF; 74 kB) In: reinerstemme.aero. June 2019, accessed June 25, 2019 .
  14. ↑ a b Specifications Annex 1 - Battery System. (PDF; 260 kB) In: reinerstemme.aero. RS.aero, August 2018, accessed on November 18, 2018 .