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Schempp-Hirth Janus
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| 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) |
| 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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