Schempp-Hirth Standard Cirrus
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| Type designation | Standard Cirrus |
| Competition class | Standard |
| Number built | |
| Crew | 1 |
| Length | 6.35 m |
| Height | 1.32 m |
| Cockpit width | 0.55 m |
| Cockpit height | 0.74 m |
| Wingspan | 15 m |
| Wing area | 10.00 m² |
| Aspect ratio | 22.5 |
| Wing profile | FX S-02-196 modified |
| Empty mass | ca. 215 kg |
| Water ballast | 80 kg |
| Maximum mass | 390 kg |
| Wing loading | ca. 31 - 39 kg/m² |
| Maximum speed | 220 km/h (119 kts) |
| Rough air speed | 220 km/h (119 kts) |
| Stall speed | 62 km/h (33.5 kts) |
| Minimum sink rate | ca. 0.6 m/s |
| Best glide ratio | 38.5 at 90 km/h (48.5 kts) |
The Standard Cirrus is a glider built by Schempp-Hirth.
The Standard Cirrus was designed by Dipl. Ing. Klaus Holighaus and flew for the first time in March 1969. It is a Standard Class glider with a 15 metre span and no camber changing flaps. The all-moving tailplane that was a feature of many designs of that period due to its theoretically higher efficiency, caused less than desirable high speed stability characteristics, and so modifications were made to the early design. Even so, the glider is still very sensitive in pitch.
By April 1977, when production by Schempp-Hirth ended, a total of 700 Standard Cirruses had been built, including 200 built under licence by Grob between 1972 and July 1975. A French firm, Lanaverre Industrie, had also built 30 Standard Cirruses under licence by 1979. VTC of Yugoslavia also licence-built Standard Cirruses, reaching 14 by 1979.
Improvements were made with the Standard Cirrus 75. These included better air-brakes with an increased area and a modified nose.
The last Cirrus model was the G/81 built by VTC until 1985. This incorporated a longer fuselage and canopy and a conventional tailplane and elevator with the wings of the Cirrus 75. All models of Cirrus have proved very popular in recent years in 'Club Class' Competitions worldwide.
The Cirrus was superseded by the Discus.
[edit] Sources
- Schempp-Hirth Website
- Standard Cirrus Web Page
- Simons M, Segelflugzeuge 1965-2000, Eqip, 2004
- Sailplane Directory
- American narrative of World Championships (see 1968).
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