| G 104 Speed Astir and Speed Astir II | |
|---|---|
| Type | 15 metre class sailplane |
| National origin | Germany |
| Manufacturer | Grob |
| Designed by | Burkhart Grob |
| Maiden flight | April 1978 |
| Number built | 98 |
The Grob G 104 Speed Astir was a competition sailplane produced in Germany in the late 1970s as Grob's first design in the 15 metre class. An aerospace manufacturer is a company or individual involved in the various aspects of designing building testing selling and maintaining Aircraft, Aircraft parts The maiden flight of an Aircraft is the first occasion on which an aircraft leaves the ground of its own accord This is a list of Aviation -related events from 1978: Events January January 1 - British Aircraft Corporation Taking the G 102 Astir design as a starting point, the Speed Astir featured a new wing of narrower chord and different section, a fin and rudder of reduced height, capacity for 150 kg (330 lb) of water ballast, and "elastic flaps". WikipediaWikiProject Aircraft. Please see WikipediaWikiProject Aircraft/page content for recommended layout This latter feature eliminated the drag normally created by the gap between the wing trailing edge and a deployed flap by attaching the highly-elastic skin of the wing to the flap itself, so that when the flap was deployed, this skin would stretch over the gap that would normally be created.
The original Speed Astir flew in early 1978, but was replaced in production by the end of the year by a refined design named the Speed Astir II. This had a slimmer, laminar-flow fuselage and made use of carbon fibre in its construction. A version with a lengthened fuselage for taller pilots and incorporating carbon fibre wing spars was made available in 1979 as the IIB, along with an increased-span version of the IIB as the II 17. 5. Production of all variants was discontinued shortly thereafter.
Specifications (Speed Astir II)
General characteristics
- Crew: One pilot
- Length: 6. 69 m (21 ft 11 in)
- Wingspan: 15. 00 m (49 ft 3 in)
- Height: 1. 27 m (4 ft 2 in)
- Wing area: 11. 5 m² (124 ft²)
- Aspect ratio: 19. 6
- Empty weight: 265 kg (584 lb)
- Gross weight: 515 kg (1,135 lb)
Performance
- Maximum speed: 270 km/h (168 mph)
- Maximum glide ratio: 41. 5
- Rate of sink: 0. 6 m/s (120 ft/min)
References
- Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions, 441.
- Hardy, Michael (1982). Gliders and Sailplanes of the World. Shepperton: Ian Allen, 49-50.
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