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G104 Speed Astir and Speed Astir II
Grob Speed Astir IIb.jpg
Speed Astir IIb in flight
Role 15 metre class sailplane
National origin Germany
Manufacturer Grob Aircraft
Designer Burkhart Grob
First flight April 1978
Number built 108

The Grob G104 Speed Astir was a competition sailplane produced in Germany in the late 1970s as Grob's first design in the 15 metre class. Taking the G102 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". 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)[edit]

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)


  • Maximum speed: 270 km/h (168 mph)
  • Maximum glide ratio: 41.5
  • Rate of sink: 0.6 m/s (120 ft/min)


  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 441. 
  • Hardy, Michael (1982). Gliders and Sailplanes of the World. Shepperton: Ian Allan. pp. 49–50. 
  • Homepage of Grob Aircraft

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Grob_G104_Speed_Astir — Please support Wikipedia.
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5 videos found

Grob 104 Speed Astir IIB First Flight

Checking out the instruments on DY.

GoPro Hero Speed Astir II

Here is my second filming with the GoPro Hero in may Grob Speed Astir II. I shot in the wide angle format 1080i Air Sailing Nevada. Almost made it to Susanville ...

Speed Astir in Wave and A full moon

Here is my Grob Speed Astir II and I in wave. I got up to 16000ft and flew over the clouds. Then I was surprised by a beautiful full moon.... ? Video was taken at ...

Überflug Speed Astir

Grob Twin III on winch

5 videos found

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