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<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
#REDIRECT [[Grob G102 Astir]]
{|{{Infobox Aircraft Begin
| name=G102 Astir
| image=Image:astir.jpg
| caption=Astir CS in flight
}}{{Infobox Aircraft Type
| type=[[FAI Standard Class|Standard-class]] sailplane
| national origin=Germany
| manufacturer=[[Grob Aircraft]]
| designer=[[Burkhart Grob]]
| first flight=December {{avyear|1974}}
| introduced=
| retired=
| status=
| primary user=
| number built=1241+
| developed from=
| variants with their own articles=
}}
|}

The '''G102 Astir''' is a single seat [[glassfibre]] [[FAI Standard Class|Standard Class]] [[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 rather poor high speed performance compared to other Standard class gliders. In early versions some of the fuselage frame was wood, but this was replaced with a light alloy casting which sometimes cracks after heavy landings. The tail dolly is unusual by being plugged into a vertical hole.

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 main-wheel ahead of its center of gravity, 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 long line of Astirs is the '''G102 Standard Astir III''', designed by [[Burkhart Grob]] and built by [[Grob Aircraft]] as a follow on design to the original [[Grob G-102 Astir]].

One Astir (now residing at the Steven F. Udvar-Hazy Center), flown by Robert Harris, broke the world absolute altitude record at 49,009 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]</ref>.


<!-- ==Development== -->
<!-- ==Operational history== -->
[[Image:Grob 102 Standard Astir III.jpg|thumb|200px|right|G102 Standard Astir III]]
==Variants==
;Astir CS
:The original production version of the Astir, produced up to 1976. CS representing Club/Standard.
;Astir CS77
:Production aircraft from 1977, with revised fuselage profile and other improvements.
;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 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.

<!-- ==Units using this aircraft/Operators (choose)== -->
==Specifications==
{{aerospecs
|ref=
|met or eng?=<!-- eng for US/UK aircraft, met for all others. You MUST include one or the other here, or no specifications will show -->met

|crew=One pilot
|capacity=50 kg (110 lb) water ballast
|length m=
|length ft=
|length in=
|span m=15.00
|span ft=49
|span in=3
|swept m=<!-- swing-wings -->
|swept ft=<!-- swing-wings -->
|swept in=<!-- swing-wings -->
|rot number=<!-- helicopters -->
|rot dia m=<!-- helicopters -->
|rot dia ft=<!-- helicopters -->
|rot dia in=<!-- helicopters -->
|dia m=<!-- airships etc -->
|dia ft=<!-- airships etc -->
|dia in=<!-- airships etc -->
|width m=<!-- if applicable -->
|width ft=<!-- if applicable -->
|width in=<!-- if applicable -->
|height m=
|height ft=
|height in=
|wing area sqm=12.4
|wing area sqft=133
|swept area sqm=<!-- swing-wings -->
|swept area sqft=<!-- swing-wings -->
|rot area sqm=<!-- helicopters -->
|rot area sqft=<!-- helicopters -->
|volume m3=<!-- lighter-than-air -->
|volume ft3=<!-- lighter-than-air -->
|aspect ratio=<!-- sailplanes -->18.2
|empty weight kg=255
|empty weight lb=561
|gross weight kg=450
|gross weight lb=990
|lift kg=<!-- lighter-than-air -->
|lift lb=<!-- lighter-than-air -->

|eng1 number=
|eng1 type=
|eng1 kw=<!-- prop engines -->
|eng1 hp=<!-- prop engines -->
|eng1 kn=<!-- jet/rocket engines -->
|eng1 lbf=<!-- jet/rocket engines -->
|eng1 kn-ab=<!-- afterburners -->
|eng1 lbf-ab=<!-- afterburners -->
|eng2 number=
|eng2 type=
|eng2 kw=<!-- prop engines -->
|eng2 hp=<!-- prop engines -->
|eng2 kn=<!-- jet/rocket engines -->
|eng2 lbf=<!-- jet/rocket engines -->
|eng2 kn-ab=<!-- afterburners -->
|eng2 lbf-ab=<!-- afterburners -->

|max speed kmh=
|max speed mph=
|max speed mach=<!-- supersonic aircraft -->
|cruise speed kmh=<!-- if max speed unknown -->
|cruise speed mph=<!-- if max speed unknown -->
|range km=
|range miles=
|endurance h=<!-- if range unknown -->
|endurance min=<!-- if range unknown -->
|ceiling m=
|ceiling ft=
|glide ratio=<!-- sailplanes -->38
|climb rate ms=
|climb rate ftmin=
|sink rate ms=<!-- sailplanes -->0.62
|sink rate ftmin=<!-- sailplanes -->122

|armament1=
|armament2=
|armament3=
|armament4=
|armament5=
|armament6=
}}
<!-- ==See also== -->
{{aircontent
<!-- include as many lines are appropriate. additional lines/entries with carriage return. -->
|see also=
|related=<!-- related developments -->
|similar aircraft=<!-- similar or comparable aircraft -->
|lists=<!-- related lists -->
}}

==Performance without water ballast==

===Best Glide===

Glide Ratio of 37 at 50 knots (92 km/h) which gives a sink rate of 141 ft/min (0.71 m/s)<br />
(Can fly 5.9 nm (10.97 km) per 1000 ft)

===Minimum Sink===

Glide Ratio of 34 at 41 knots (76 km/h) which gives a sink rate of 122 ft/min (0.62 m/s)<br />
(Can fly 5.6 nm (10.36 km) per 1000 ft)

===At 90 knots (166 km/h)===

Glide Ratio of 23 at 90 knots (166 km/h) which gives a sink rate of 393 ft/min (2.00 m/s)<br />
(Can fly 3.8 nm (7.01 km) per 1000 ft)

===Stalling===

Stalling: (without airbrakes) 32 knots (60 km/h) (with airbrakes) 35 knots (65 km/h)<br />

===Velocities===

Never Exceed: 135 knots (250 km/h)<br />
In Rough Air: 135 knots (250 km/h)<br />
Manoeuvering: 92 knots (170 km/h)<br />
On Aerotow: 92 knots (170 km/h)<br />
On Winch: 64 knots (120 km/h)<br />
Airbrakes: 135 knots (250 km/h)<br />
Gear Down: 135 knots (250 km/h)<br />

===Payloads===

Minimum: 70 kg<br />
Maximum: 110 kg

==References==
*[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}}
{{aviation lists}}

[[Category:German sailplanes 1970-1979]]
[[Category:Glider aircraft]]
[[Category:Grob aircraft]]

[[ar:جروب جي 102 أستر]]
[[de:Grob G 102]]

Revision as of 09:56, 25 October 2010

G102 Astir
Astir CS in flight
Role Standard-class sailplane
National origin Germany
Manufacturer Grob Aircraft
Designer Burkhart Grob
First flight December Template:Avyear
Number built 1241+

The G102 Astir is a single seat glassfibre Standard Class 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 rather poor high speed performance compared to other Standard class gliders. In early versions some of the fuselage frame was wood, but this was replaced with a light alloy casting which sometimes cracks after heavy landings. The tail dolly is unusual by being plugged into a vertical hole.

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 main-wheel ahead of its center of gravity, 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 G104 Speed Astir was also produced.

The latest in the long line of Astirs is the G102 Standard Astir III, designed by Burkhart Grob and built by Grob Aircraft as a follow on design to the original Grob G-102 Astir.

One Astir (now residing at the Steven F. Udvar-Hazy Center), flown by Robert Harris, broke the world absolute altitude record at 49,009 ft (14,938 m) on 17 February 1986. This record lasted until 2006 [1].


G102 Standard Astir III

Variants

Astir CS
The original production version of the Astir, produced up to 1976. CS representing Club/Standard.
Astir CS77
Production aircraft from 1977, with revised fuselage profile and other improvements.
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 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

General characteristics

  • Crew: One pilot
  • Capacity: 50 kg (110 lb) water ballast
  • Aspect ratio: 18.2

Performance

  • Maximum glide ratio: 38

Performance without water ballast

Best Glide

Glide Ratio of 37 at 50 knots (92 km/h) which gives a sink rate of 141 ft/min (0.71 m/s)
(Can fly 5.9 nm (10.97 km) per 1000 ft)

Minimum Sink

Glide Ratio of 34 at 41 knots (76 km/h) which gives a sink rate of 122 ft/min (0.62 m/s)
(Can fly 5.6 nm (10.36 km) per 1000 ft)

At 90 knots (166 km/h)

Glide Ratio of 23 at 90 knots (166 km/h) which gives a sink rate of 393 ft/min (2.00 m/s)
(Can fly 3.8 nm (7.01 km) per 1000 ft)

Stalling

Stalling: (without airbrakes) 32 knots (60 km/h) (with airbrakes) 35 knots (65 km/h)

Velocities

Never Exceed: 135 knots (250 km/h)
In Rough Air: 135 knots (250 km/h)
Manoeuvering: 92 knots (170 km/h)
On Aerotow: 92 knots (170 km/h)
On Winch: 64 knots (120 km/h)
Airbrakes: 135 knots (250 km/h)
Gear Down: 135 knots (250 km/h)

Payloads

Minimum: 70 kg
Maximum: 110 kg

References

  1. ^ List of official records on the Fédération Aéronautique Internationale web site
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