Schempp-Hirth Mini-Nimbus
| Mini-Nimbus | |
|---|---|
 |
|
| Mini Nimbus HS-7 | |
| Role | 15 Metre class sailplane |
| National origin | Germany |
| Manufacturer | Schempp-Hirth |
| Designer | Klaus Holighaus |
| First flight | 18 September 1976 |
| Number built | 159 |
The Schempp-Hirth Mini Nimbus is a 15 Metre-class glider designed and built by Schempp-Hirth GmbH in the late 1970s.
In designing the Mini-Nimbus, Klaus Holighaus incorporated the flapped wings from the Glasflügel 303 Mosquito, with the fuselage of the Standard Cirrus. The wings feature trailing edge terminal speed dive brakes-variable camber flaps that limit the vertical dive speed to a maximum of 70 knots when the dive brakes are fully deployed.
The name "Mini Nimbus" was adopted to distinguish it from longer-wingspan Nimbus models. It first flew on 18 September 1976.
The Mini Nimbus range all feature self-connecting controls, of Glasflügel design, for added safety and ease of rigging, and have been incorporated in all newer Schempp-Hirth models. The trim lever is connected to the flap operating rod and needs to be set only once per flight; thereafter changes in flap setting (-7 to +10 degrees) automatically provides trim compensation.
Based on the Standard Cirrus, the original Mini-Nimbus HS-7 design had an all-moving tailplane and fibre glass wing spars. A tailplane anti-balance tab was a required modification for certification in the United Kingdom after flight testing by Derek Piggott on behalf of the British Gliding Association revealed very low stick forces and marginal pitch stability of the HS-7 version. A conventional tail was added for the Mini-Nimbus B version. The conventional horizontal stabiliser/elevator configuration was less sensitive to inputs by the pilot making it easier to fly without constantly making small adjustments to the pitch attitude. This was due to the much larger control surface of the former compared to the later configuration.
The Mini-Nimbus C version had an increased maximum takeoff weight. Additionally, lighter weight wings with spars and shells of carbon-fibre was available as an option for the C version (meaning that only some Mini Nimbus C has carbon fibre wings, the "C" is often thought to represent "Carbon" which is not correct).
The Nimbus 2C and the Mini Nimbus C were the first two carbon-fibre aircraft to be built by Schempp-Hirth. The use of carbon-fibre significantly lightened the Mini Nimbus improving its climbing performance and increasing water ballast capacity while making assembly and disassembly much easier.
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