The document summarizes developments from Arcus and Quintus, two-seater and open class sailplanes respectively. For Arcus, preliminary considerations focused on comparable performance to reference sailplanes. Its design involved optimizing the airfoil, wing geometry, winglets, and aeroelastic properties. The first mold was begun in January 2009. Flight tests found it agile with good maneuverability. The Arcus M and E models are also introduced. For Quintus, the goal was an innovative open class self-launch sailplane with a high wingloading range for competition but also easy handling for other flights. Its wing was resized for lower weight but higher loading with water ballast. Both sailplanes went through prototy

1. RENO CONVENTION 2012
Innovation in the
two-seater class
Arcus Developement

2. Preliminiary considerations :
Swen Lehner
Christoph
Wannenmacher
Joachim Krauter

3. Preliminiary considerations
:
Dr. Werner Würz
Director of the laminar wind
tunnel of the University Stuttgart

4. Preliminiary considerations
Reference was Ventus 2cxM/Nimbus 4DM:
Comparable stall speed
Comparable take of speed
First start-airfoil: WW99k137
Wing area: 15,6 m2

5. Arcus - Design:
Aerodynamic
Aeroelastic Flight characteristics
Project: Arcus
Structure Airworthiness
requirements
Operation limits

6. Arcus – Design:
Airfoil optimizing: Werner Würz, LWK Stuttgart
Wing geometry - optimizing: Jan Himisch
Karl Heinz Horstmann
DLR Braunschweig

7. Arcus - Design:
Winglet optimizing: Prof. Mark Maughmer, PSU

8. Arcus - Design:
Aeroelastic optimizing: Andreas Lutz
(Aka München, now Schempp-Hirth)
Jan Schwochow
DLR Göttingen

9. Arcus – Molding:

10. First mold
Beginning January 2009

11. Resumee
(subjektive CG)
• Agil, good manoevrability
• Arcus with high wingloading climbs as good as the Duo´s
•Advantage by straight flights with high speeds
• Starting, landing: Flaps, 3-panel airbreaks, high and spring
loaded undercarriage, roomy cockpit, comfortable
• Performance – for example Reinhard Schramme in
Bitterwasser/Namibia
• makes fun

12. Resumee
(subjektive CG)
• Performance – for example Reinhard Schramme in
Bitterwasser/Namibia

13. Arcus M

14. Arcus M

15. Arcus E

16. Arcus E
Arcus E above the factory

17. Quintus
Innovation in the
Open Class
Developement

18. Preliminiary considerations :
-Pilot desire for a fast Open Class selfaunch
sailplane
-With a high wingload range for competition
pilots
-AND easy ground handling and agil in the
air for record flights, for recreation and
expedition and above all: for fun flights
New concept necessary!

19. Preliminiary considerations :
Span + wingarea downsizing,
high aspect ratio
Low weight for wingloads below
39kg/qm (6,9 lb/ft2),
With water ballast extrem high
wingloading 58kg/qm (almost 12 lb/ft2) !
Solution: new wing design with 23m
(75,5 ft) as a result of fruity cooperation
with Lange Aviation

20. Preliminiary considerations :
Fuselage
- Comfort
- Safety (new strict CS 22)
- Elegance
Wing
- Modern airfoil
- High performance with high wingloads
. and in high speeds

21. Preliminiary considerations :
Propulsion System
-New Solo 2625-2i with electronic
controlled fuel injection for max. power
also at high density altitude
-70 HP
-New, fully automatic ILEC control for
easy operation („ON-OFF switch“)
-Integrated steering tailwheel
/(System Lange)

22. First Design Study :

23. „Sister Ship Antares 23E :
Modern airfoils from Loek Boermans
for Antares and Quintus

24. Preliminiary considerations :
Winglet optimizing: Prof. Mark Maughmer, PSU

25. Quintus Prototyping
Root rib connection
Proofed center steel frame for maximum
Pilot Protection

26. Quintus Prototyping

27. Quintus Prototyping

28. Quintus M
70 horsepower with electronic injection system

29. Quintus M

30. Quintus

31. Quintus M

32. Quintus M
Do you like it...?

33. Quintus M
Do you like it...?

34. Quintus M
Do you like it...?

35. Top Trainer, Duo Discus XL

36. Top performance, Duo Discus XL
Gordon Boettger
Hugh Benett
Almost 1300 miles in 13 hours

37. Certified total rescue system

38. Certified Emergency Exit Assist System
NOAH

39. Certified manual operated rudder control
Jet sustainer

40. The „heilige Discus“ - new reference
sailplane for the IDAFLIEG measurements

41. Other Activities

42. Other Activities

43. And what we like most... :-)

44. Thank you for your attention