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Schempp-Hirth Janus

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Schempp-Hirth Janus C
Schempp-Hirth Janus C 850309 JTomas.jpeg
A Janus C landing at Igualada, Spain.
Type designation Janus
Competition class Two Seater
Number built 300
Crew 2
Length 8.62 m
Height ca. 1.5 m
Cockpit width 0.71 m
Cockpit height 1.02 m
Wingspan 18.2 m (Janus A, B)
20.0 m (Janus C)
Wing area 16.6 m² (Janus A, B)
17.3 m² (Janus C)
Aspect ratio 20.0 (Janus A, B)
23.1 (Janus C)
Wing profile FX 67-K-170 / 150
Empty mass ca. 370 kg (Janus A, B)
ca. 365 kg (Janus C)
Water ballast 120 kg (Janus B)
240 kg (Janus C)
Maximum mass 620 kg (Janus A, B)
700 kg (Janus C)
Wing loading ca. 27 – 37.3 kg/m² (Janus A, B)
ca. 31 – 39 kg/m² (Janus C)
Maximum speed 220 km/h (Janus B)
Maneuver speed 170 km/h (Janus B)
Minimum sink ca. 0.7 m/s (Janus B)
ca. 0.6 m/s (Janus C)
Best glide ratio 39.5 (Janus A, B)
43 at 110 km/h (Janus C)
Janus CM, Janus CT
Empty mass ca. 417 kg (Janus CM)
Engine type Rotax 535 C (Janus CM)
Solo 2350 (Janus CT)
Engine power 45 kW (Janus CM)
15 kW (Janus CT)

The Schempp-Hirth Janus C is a high performance two-seat glider that was built by Schempp-Hirth GmbH.

The design was by Dipl-Ing Klaus Holighaus and the prototype first flew in May 1974. The production examples incorporated several improvements in January 1975. The Janus has a glass-fibre monocoque fuselage similar to that of the Nimbus-2 but the cockpit section is lengthened to accommodate the two pilots in tandem with dual controls under a hinged one-piece canopy. Landing gear consists of a non-retractable main wheel with a drum-brake, and a nose-wheel. The two-piece wings have 2° forward sweep on the leading edge, and have camber-changing flaps which are operated between +12° and -7°.

The Janus B was produced from March 1978. It has a fixed-incidence tailplane instead of the all-moving type previously fitted. The Janus C has carbon-fibre wings of 20 m span and a carbon-fibre tailplane.

The Janus M is a motorised version with a Rotax engine mounted on a pylon aft of the cockpit and retracting into the fuselage. The prototype first flew in 1978.

100 Januses were built by early 1980 plus three motorised Janus CMs. It is particularly suitable for cross-country instruction and training to fly flapped gliders.

The French developed the Janus as the SCAP–Lanaverre SL-2. (SCAP is the Société de Commercialisation Aéronautique du Plessis SàRL with Lanaverre Industries) It first flew in 1977. The main differences from the Janus A are the provision for water ballast in the wings, a fixed tailplane with elevators, and a more comfortable cockpit with provision for parachutes.

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