Grob G 104 Speed Astir

__NOTOC__ Infobox Aircraft
name=G 104 Speed Astir and Speed Astir II


caption=
type=15 metre class sailplane
national origin=Germany
manufacturer=Grob
designer=Burkhart Grob
first flight=April avyear|1978
introduced=
retired=
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primary user=
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produced=
number built=98
variants with their own articles=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. 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". 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.

pecifications (Speed Astir II)

aerospecs
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met or eng?= met

crew=One pilot
capacity=
length m=6.69
length ft=21
length in=11
span m=15.00
span ft=49
span in=3
swept m=
swept ft=
swept in=
rot number=
rot dia m=
rot dia ft=
rot dia in=
dia m=
dia ft=
dia in=
width m=
width ft=
width in=
height m=1.27
height ft=4
height in=2
wing area sqm=11.5
wing area sqft=124
swept area sqm=
swept area sqft=
rot area sqm=
rot area sqft=
volume m3=
volume ft3=
aspect ratio= 19.6
empty weight kg=265
empty weight lb=584
gross weight kg=515
gross weight lb=1,135
lift kg=
lift lb=

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max speed kmh=270
max speed mph=168
max speed mach=
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range km=
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endurance h=
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ceiling m=
ceiling ft=
glide ratio= 41.5
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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