Grob G 103 Twin Astir

__NOTOC__ Infobox Aircraft
name=G 103 Twin Astir


caption=
type=Sailplane
national origin=Germany
manufacturer=Grob
designer=
first flight=31 December avyear|1976
introduced=
retired=
status=
primary user=
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produced=
number built=ca. 225
variants with their own articles=

The Grob G 103 Twin Astir was a two-seat sailplane developed in Germany in the 1970s as a counterpart to the single-seat G 102 Astir then in production. Construction throughout was similar, although to preserve the balance of the design, the wings were given a slight forward sweep. While many two-seat derivatives of single-seat sailplanes have fixed undercarriage, due to the added space restrictions created by the second seat, Grob devised a novel retraction system for the Twin Astir. The single wheel was designed to rotate 90° sideways before retracting "flat" under the rear seat. This was only incorporated in early examples, later on, the wheel was fixed. Options offered to customers included whether the front seat should be equipped with flight instruments, and whether water ballast capacity should be installed.

Production continued until around 1980, when it was replaced in production by the Twin II, a new and not directly related design originally designated G 118 but later redesignated the G 103a.

pecifications

aerospecs
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met or eng?= met

crew=One pilot
capacity=1 passenger
length m=8.1
length ft=26
length in=7
span m=17.5
span ft=57
span in=5
swept m=
swept ft=
swept in=
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rot dia m=
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dia m=
dia ft=
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width m=
width ft=
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height m=1.60
height ft=5
height in=3
wing area sqm=17.9
wing area sqft=193
swept area sqm=
swept area sqft=
rot area sqm=
rot area sqft=
volume m3=
volume ft3=
aspect ratio= 17.1
empty weight kg=390
empty weight lb=860
gross weight kg=620
gross weight lb=1,370
lift kg=
lift lb=

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max speed kmh=250
max speed mph=160
max speed mach=
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ceiling m=
ceiling ft=
glide ratio= 38
climb rate ms=
climb rate ftmin=
sink rate ms= 0.6
sink rate ftmin= 120

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armament6= aircontent
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References

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