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((Short description|German single-seat glider, 1974))
((More citations needed|date=December 2012))
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->

{|((Infobox Aircraft Begin
|name=G102 Astir
|image=astir.jpg
|caption=Astir CS in flight
))((Infobox Aircraft Type
|type=[[FAI Club Class|Club Class]] sailplane
|national origin=Germany
|manufacturer=[[Grob Aircraft]]
|designer=[[Burkhart Grob]]
|first flight=December 1974
|introduced=1975
|number built=1241+))
|}

[[File:Grob G 102 Standard Astir III N17999 20040514.jpg|right|thumb|Grob G 102 Standard Astir III N17999, National Air and Space Museum]]
The '''G102 Astir''' is a single-seat [[glassfibre]] [[FAI Club Class|Club Class]] [[Glider (sailplane)|sailplane]], designed by [[Burkhart Grob]] and built by [[Grob Aircraft]]. It was the first Grob-designed sailplane, with the first flight in December 1974. Grob had previously built the [[Schempp-Hirth Standard Cirrus]] under licence.

==Design and development==
The Astir CS [Club Standard] is of composite (fiberglass/resin) construction, has a large wing area, a T-tail and water ballast tanks in its wings. The large wing area gives good low-speed handling characteristics but its high-speed performance is inferior to other [[Glider competition classes#Standard Class|Standard Class]] gliders. In early versions, some of the fuselage frame was wood but this was replaced with a light alloy casting which sometimes cracked after heavy landings. The tail dolly is unusual by being a loose fit into a vertical hole and able to fall free if take-off is attempted with the dolly in place.

A slightly improved Standard Class version, the CS 77, was introduced in 1977. It has a different rudder profile and a slimmer fuselage similar to that of the Speed Astir. The Standard II and Standard III versions followed in the early 1980s, reverting to the higher-profile fuselage and with a reduced empty weight and an increased payload.

The Astir CS Jeans was similar to the CS 77, but had a fixed mainwheel and a tailskid. Its cockpit was fitted in blue denim. Later versions were the Club II and the Club III which also had fixed gear, but the Club III had a tailwheel.

The numbers built of each type were: 536 CS, 244 CS77, 248 CS Jeans, 61 Club/Standard Astir II and 152 Club/Standard Astir III. A flapped version called the [[Grob G 104 Speed Astir|G104 Speed Astir]] was also produced.

The latest in the Astir line is the '''G102 Standard Astir III''', designed by [[Burkhart Grob]] and built by [[Grob Aircraft]] as a development of the original G-102.

One Astir (now residing at the Steven F. Udvar-Hazy Center), flown by Robert Harris, broke the world absolute altitude record at 49,009&nbsp;ft (14,938 m) on 17 February 1986. This record lasted until 2006.<ref>[http://records.fai.org/gliding/current.asp?id1=275&id2=1 List of official records] on the [[Fédération Aéronautique Internationale]] web site((dead link|date=October 2017 |bot=InternetArchiveBot |fix-attempted=yes ))</ref>

[[File:Grob 102 Standard Astir III.jpg|thumb|200px|right|G102 Standard Astir III]]
[[File:Astir-JPM.jpg|thumb|right|Astir CS Jeans launching]]

==Variants==
;Astir CS
:The original production version of the Astir, produced up to 1977 (CS = Club Standard)
;Astir CS77
:Production aircraft from 1977, with revised fuselage profile and other modifications
;Speed Astir
:The Astir with a flapped wing to comply with the FAI 15m Flapped Class, for gliding competitions
;Astir CS Jeans
:Astir aircraft with faired fixed undercarriage, to comply with the Club Class for gliding competitions and to provide "glass-ship" experience at lower cost.
;G102 Astir
:Designation introduced by Grob for the Astir series in the 1980s, with each successive improvement given the suffix I, II or III etc.
;G104 Speed Astir
:The Speed Astir re-designated

==Specifications (Standard Astir III)==
((Aircraft specs
|ref=[http://www.solidcad.hu/ass/GLIDING/LETOLTESEK_GLIDING/astir/grob102_flight_manual.pdf Grob G102 manual]
|prime units?=met<!-- imp or kts first for US aircraft, and UK aircraft pre-metrification, 
met(ric) first for all others. You MUST choose a format, or no specifications will show -->
<!--
        General characteristics
-->
|genhide=
|crew=1
|capacity=
|length m=6.75
|length ft=
|length in=
|length note=
|span m=15.0
|span ft=
|span in=
|span note=
|height m=1.26
|height ft=
|height in=
|height note=
|wing area sqm=12.4
|wing area sqft=
|wing area note=
|aspect ratio=18.2
|airfoil=
|empty weight kg=250
|empty weight lb=
|empty weight note=approximately
|gross weight kg=450
|gross weight lb=
|gross weight note=with water ballast; without ballast 350 kg (770 lb)
|max takeoff weight kg=
|max takeoff weight lb=
|max takeoff weight note=
|more general=

<!--
        Performance
-->
|perfhide=
|max speed kmh=170
|max speed mph=
|max speed kts=
|max speed note=manoeuvring and airtow
|max speed mach=<!-- supersonic aircraft -->
|cruise speed kmh=
|cruise speed mph=
|cruise speed kts=
|cruise speed note=
|stall speed kmh=59
|stall speed mph=
|stall speed kts=
|stall speed note=without airbrakes
|never exceed speed kmh=250
|never exceed speed mph=
|never exceed speed kts=
|never exceed speed note=
|minimum control speed kmh=
|minimum control speed mph=
|minimum control speed kts=
|minimum control speed note=
|range km=
|range miles=
|range nmi=
|range note=
|combat range km=
|combat range miles=
|combat range nmi=
|combat range note=
|ferry range km=
|ferry range miles=
|ferry range nmi=
|ferry range note=
|endurance=<!-- if range unknown -->
|ceiling m=
|ceiling ft=
|ceiling note=
|g limits=<!-- aerobatic -->
|roll rate=<!-- aerobatic -->
|glide ratio=Best 38, at 105 km/h (64 mph, 56 kn) and 0.77 m/s (152 ft/m) 
|climb rate ms=
|climb rate ftmin=
|climb rate note=
|time to altitude=
|sink rate ms=0.62<!-- sailplanes -->
|sink rate ftmin=<!-- sailplanes -->
|sink rate note=minimum, at 76 km/h (47 mph, 42 kn) and glide ratio 34
|lift to drag=
|wing loading kg/m2=
|wing loading lb/sqft=
|wing loading note=
|disk loading kg/m2=
|disk loading lb/sqft=
|disk loading note=
|fuel consumption kg/km=
|fuel consumption lb/mi=
|power/mass=
|thrust/weight=
|more performance=
|avionics=
))

==See also==
((aircontent
<!-- include as many lines are appropriate. additional lines/entries with carriage return. -->
|see also=
|related=<!-- related developments -->
*[[Grob G104 Speed Astir]]
|similar aircraft=<!-- similar or comparable aircraft -->
*[[Glasflügel 205 Club Libelle]]
*[[Schleicher ASK 23]]
*[[SZD-51 Junior]]
|lists=<!-- related lists -->
*[[List of gliders]]
))

==References==
((Commons category|Grob G 102 Astir))
*[https://web.archive.org/web/20060926221015/http://www.sailplanedirectory.com/PlaneDetails.cfm?planeID=22 Sailplane Directory]
*Hardy, M. ''Gliders & Sailplanes of the World''. Ian Allan, 1982
*[http://www.grob-aircraft.com Homepage of Grob Aircraft AG]
((reflist))

((Grob aircraft))

[[Category:1970s German sailplanes]]
[[Category:Grob aircraft]]
[[Category:Aircraft first flown in 1974]]
[[Category:T-tail aircraft]]

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