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Grob G-104 Speed Astir II
 
grob104speed
 
This single-seater Unrestricted 15m Class version of the Astir is generally similar to the Astir CS 77 except for wings of reduced area and different section, which have carbon-fibre spars and are fitted with so called 'elastic flaps' in which the gaps between the flap and the wing trailing edge are elastically sealed; these flaps can be deflected upwards to act as air brakes as well as downwards, and the ailerons can be drooped with the flaps.
The Speed Astir has the same cantilever mid-wing and T-tail as the Astir, but with a shorter fin and rudder and constructionally it is the same as its predecessor. The water ballast capacity has been increased to 330 lb.
After 25 of the original Speed Astirs had been built, production switched to the Speed Astir II which first flew on 11 November 1978. This had a new and slimmer laminar flow fuselage, with carbon-fibre reinforcements in high stress areas, and a two-piece canopy, the rear section of which hinges to open aft.
 
Grob-104-SA2
Grob G-104 Speed Astir II
 
In October 1979 the cockpit was lengthened by nearly 8in to accommodate taller pilots, and the Speed Astir IIB has carbon-fibre spars. From the same date the Speed Astir II 17.5, a version with a longer span of 17.5m, was due to become available. Altogether 98 Speed Astir IIs had been built by December 1979 and the type is out of production.
 
G 104 Speed Astir II & IIb
Wing span: 15m / 49 ft 2.5 in
Wing area: 11.46 sq.m / 123.4 sq.ft
Length: 21 ft 11.25 in
Height: 4 ft 2 in
Empty Weight: 265 kg / 584 lb
Payload: 250 kg / 551 lb
Gross Weight: 515 kg / 1135 lb
Wing Load: 44.94 kg/sq.m / 9.19 lb/sq.ft
Water Ballast: 140 kg / 308 lb
Max speed:168 mph (smooth air)
MinSink: 0.70 m/s / 2.3 fps / 1.36 kt at 47mph
L/DMax: 40 95 kph / 52 kt / 60 mph
Best glide ratio: 41.5:1 at 74.5 mph
Aspect ratio: 19.6
Airfoil: Eppler E 662
Seats: 1
No. Built: 107
 
 
 
 
 
 


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