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ARCUS - the new "Flapped" 20m Class

For several years now we have been working on the idea of a completely new   concept for a two-seat glider for the 20m-class.
Therefore, our goal was to develop a glider that would add significant new elements to the worldwide increasingly popular two-seat 20m-racing class and at the same time, give all those who enjoy flying a two-seater a high performance yet easy to handle alternative with all options of engines. Most important in all this always remaines the pure joy of soaring.
To achieve this, the ARCUS will have a completely new flapped wing. In choosing the profile, both the wing’s geometrical design and method of construction were approached in a completely new way. New calculation and simulation programs were combined with tested data and trusted empirical knowledge. Thus, we were able to use a vast body of state of the art optimization knowledge that was before unavailable.
The result was a beautifully shaped, rather thin and, above all, prominently arched wing surface – first angled forward, then arched back. This shape called for the appropriate name ARCUS (lat. = the Arc)

Design and profildesign
Besides flight performance we gave special attention to the flight characteristics of the design. With the use of well proportioned control surfaces and harmonized aerodynamics, we tried to achieve the best possible handling and climb results even under high wingloading. The flaps play an important role in this. Especially in the configuration of self-launcher, the flaps will provide the additional lift necessary for a smooth take-off performance. In addition, the integrated full span flaperons will provide impressive maneuverability.

In close co-operation with Dr. Werner Würz we made fundament revisions to the original profile-design which then incorporated our various requirements.

At the same time we worked on optimizing the original wing planform in co-operation with Jan Himisch and Professor Dr. Karl-Heinz Horstman from DLR Braunschweig. To fulfill the specific aerodynamic requirements across the entire span of the wing, we used 6 different wing profiles. As a result of this fruitful co-operation between Werner Würz - the DLR Departments in Braunschweig and Goettingen - Professor Mark Maughmer (winglets) and Schempp-Hirth the Arcus wing meets the challenges and requirements in a very effective and outstanding way.

Fuselage
For the fuselage we are using the new ‘L’-cockpit already used in the new NIMBUS-4DLM and DUO DISCUS-XL. The feedback from our customers regarding its ergonomics, safety and roominess is overwhelmingly positive so we see little need for alteration here.
To complete a comfortable ride, we will install the sprung gear used on the DUO DISCUS-xl with its light and effective braking Beringer wheel.

Performance
It is too early to make claims regarding glide performance. The design parameters and the first rough calculations however are very promising.

The variants
The ARCUS will be available of course as a pure glider as well as with various engine configurations.

Turbo
The reliable Oehler-Turbo system with the Solo 2350-engine and its automatic ILEC engine control unit.

Selflaunch/combustion engin
Using the new Binder engine with a electronic injection system (Solo 2625-02i)  we expect an above average take-off performance and climb rate.

Selflaunch/electrical engin
As a unique alternative, we also plan on offering an electrical version. This will be made possible through our co-operation with Lange Aviation in Zweibrücken. The electrical engine will be installed and serviced there.

 
 

Wing span

65.62 ft

Wing area

167.92 ft²

Aspect ratio

25,7

Max. all-up mass S

1764 lb

Max. all-up mass T/M

1764 lb

Empty mass approx.

948 lb

Best L/D

approx. 50

 

 

...more Detail

 

 
 
 
 

Copyright © 2006 Schempp-Hirth Flugzeugbau GmbH, Kirchheim unter Teck, Germany.