Sailplane: Duo Discus 

Registration: D-KSFW

Manufactured by:  Schempp-Hirth Flugzeugbau GmbH

Home Club/Hangar: Fliegerschule Wasserkuppe

Known Modifications: N/A

Notes: The Duo Discus was conceived as an advanced trainer with good cross country ability. It has a four piece unflapped wing with a modified Discus planform. The fuselage is derived from that of the two-place Janus. Approach control is by top surface airbrakes.

More information:

http://en.wikipedia.org/wiki/Schempp-Hirth_Duo_Discus
http://www.schempp-hirth.com/index.php?id=33&L=1
http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=93

Reference images: