Schempp-Hirth Duo Discus
This article includes a list of general references, but it remains largely unverified because it lacks sufficient corresponding inline citations. (December 2012) (Learn how and when to remove this template message)
|Duo Discus T flying over the ridges of Pennsylvania, US|
|Role||Two Seater-class sailplane|
|Number built||Over 500|
|Duo Discus XLT about to land with water ballast still discharging from the underside of the wings|
Design and development
The Duo Discus replaced the Janus as Schempp Hirth's high-performance two-seater trainer. It has a four-piece wing with a span of 20 metres. As with most tandem two-seat gliders its wing is slightly swept forward so the wing root can be slightly aft to allow the rear pilot an improved view. Although it shares its name with the highly successful Standard Class Discus, any resemblance is only superficial. It first flew in 1993 and is still in production at the factory in Orlican in the Czech Republic. Its best glide ratio was measured as 44:1. An optional 'turbo' retractable two-stroke engine can be specified for extended gliding sessions. Over 500 Duo Discuses had been built by August 2007. In U.S. Air Force service it is known as the TG-15A. The chief rival of the Duo Discus is now the DG Flugzeugbau DG-1001.
Duo Discus X
A revised model, the Duo Discus X, was announced in 2005. This has landing flaps incorporated into the movement of the airbrake lever to improve its approach control, giving steeper and slower approaches. It also has winglets to improve thermal flying and a sprung and lower retractable undercarriage.
Duo Discus XL
The Duo Discus XL is the latest version. It shares the same fuselage as the Schempp-Hirth Arcus and the Schempp-Hirth Nimbus 4D. The cockpit is now 10 cm longer to improve seat comfort, security, space and ergonomics. The airbrake system has been moved 4 cm towards the leading edge and now extends 18mm higher. The XL is certified for simple aerobatics, including spinning. It can also be flown entirely from the back seat.
Duo Discus XL
The Duo Discus XLT is a motorized version of the Duo Discus XL.
- Crew: Two
- Capacity: 200 kg (440 lb) water ballast
- Length: 8.73 m (28 ft 3 in)
- Wingspan: 20.00 m (65 ft 7 in)
- Height: 1.60 m (5 ft 3 in)
- Wing area: 16.4 m2 (176 sq ft)
- Aspect ratio: 24.4
- Airfoil: DFVLR HX 83
- Empty weight: 410 kg (900 lb)
- Gross weight: 700 kg (1,540 lb)
- Maximum speed: 263 km/h (164 mph, 143 kn)
- Maximum glide ratio: 46-47
- Rate of sink: 0.58 m/s (114 ft/min)
Aircraft of comparable role, configuration, and era
|Wikimedia Commons has media related to Schempp-Hirth Duo Discus.|