Schempp-Hirth Discus-2

The Schempp-Hirth Discus-2 is a Standard Class sailplane produced by Schempp-Hirth since 1998. It replaced the highly successful Schempp-Hirth Discus.

Discus-2
Discus-2a 15m
Role Standard-class sailplane
National origin Germany
Manufacturer Schempp-Hirth
First flight ca. 1998
External image
Schempp-Hirth Discus 2c in flight

Design and development

In plan view the almost crescent shape of the leading edge is similar to the Discus but is tapered in three stages. An entirely new wing section is used. The dihedral towards the tips was greatly increased compared with the Discus. Winglets are an optional extra. A version with a narrow fuselage is called the Discus-2a and the wider fuselage version is called the 2b. The fuselage was specifically designed to be highly crash resistant. In U.S. Air Force service the Discus-2b is known as the TG-15B.

The Discus-2 has also been successful though the competition from the Rolladen-Schneider LS8 and the Alexander Schleicher ASW 28 has meant that the Discus-2 has not sold in such great numbers as its predecessor, which went unchallenged for many years.

18 metre version

A version with an 18-metre span, with the option of smaller wing tips to fly as a Standard Class glider, was launched in 2004 and designated Discus-2c.[1] When fitted with a small sustaining engine (turbo) it is designated Discus-2cT.[2]

Variants
Discus-2a
Production variant with 15 metre wingspan and narrow cockpit. 0.54 m (1.77 ft) in width, 0.75 m (2.46 ft) in height.[3]
Discus-2b
Production variant with 15 metre wingspan and wider cockpit. 0.62 m (2.03 ft) in width, 0.81 m (2.66 ft) in height.[4]
Discus-2T
"Turbo" variant with 15 metre wingspan and a 15.3 kW (20.5 hp) SOLO 2350 2-stroke, 2 cylinder sustainer engine.
Discus-2c
Production variant with 15 metre or 18 metre wingspan.
Discus-2cT
"Turbo" variant with 15 metre or 18 metre wingspan and a 15.3 kW (20.5 hp) SOLO 2350 2-stroke, 2 cylinder sustainer engine.
Discus-2c FES
Production variant with 15 metre or 18 metre wingspan equipped with a front electric sustainer.

Specifications (Discus-2a)

Data from [5], [6]

General characteristics

  • Crew: 1
  • Capacity: 200 kg (441 lb) water ballast, plus 7.8 kg (17 lb) in tail-unit tank
  • Length: 6.41 m (21 ft 0 in)
2b & 2c 6.81 m (22 ft)
  • Wingspan: 15 m (49 ft 3 in)
2c 18 m (59.1 ft) with extended wing-tips
  • Height: 1.3 m (4 ft 3 in)
  • Wing area: 10.16 m2 (109.4 sq ft)
2c 11.36 m2 (122 sq ft) with extended wing-tips
  • Aspect ratio: 22.2
2c 28.5 with extended wing-tips
  • Airfoil: DFVLR HQ[7]
  • Empty weight: 242 kg (534 lb)
2b 252 kg (555.6 lb)
2c 266 kg (586.4 lb), or 278 kg (612.9 lb) with extended wing-tips
  • Max takeoff weight: 525 kg (1,157 lb)
2c 565 kg (1,245.6 lb) with extended wing-tips

Performance

2c 280 km/h (170 mph; 150 kn)
  • Max manoeuvring speed: 200 km/h (120 mph; 110 kn)
2c 190 km/h (120 mph; 100 kn)
  • Maximum glide ratio: 42
  • Rate of sink: 0.59 m/s (116 ft/min)
  • Wing loading: 30.7–51.7 kg/m2 (6.3–10.6 lb/sq ft)
2c 33–52 kg/m2 (6.8–10.7 lb/sq ft) with extended wing-tips

See also

Aircraft of comparable role, configuration and era

Related lists

References
  1. Schempp-Hirth web-site Accessed 15 February 2011 Archived 16 October 2006 at the Wayback Machine
  2. Schempp-Hirth web-site Accessed 15 February 2011 Archived 16 October 2006 at the Wayback Machine
  3. "Archived copy" (PDF). Archived from the original (PDF) on 2015-09-24. Retrieved 2014-01-25.CS1 maint: archived copy as title (link)
  4. "Archived copy" (PDF). Archived from the original (PDF) on 2015-09-24. Retrieved 2014-01-25.CS1 maint: archived copy as title (link)
  5. "Discus 2" (PDF). Schempp-Hirth.com. Schempp-Hirth. Archived from the original (PDF) on 24 September 2015. Retrieved 23 June 2019.
  6. "Discus-2c" (in German and English). Schempp-Hirth. Archived from the original on 16 October 2006. Retrieved 23 June 2019.
  7. Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.
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