Coarse G 104

G 104 "Speed ​​Astir"
Type:	Glider
Design country:	BR Germany
Manufacturer:	Gross aerospace
First flight:	April 3, 1978
Number of pieces:	108

The Grob G 104 ( Speed ​​Astir ) is a single-seater performance aircraft in the 15 m racing class produced by the Swabian aircraft manufacturer Grob in Mindelheim .

history

The Speed ​​Astir had its maiden flight on April 3, 1978 and was built in the versions Speed ​​Astir II and Speed ​​Astir IIb (from serial number 4029) a total of 108 times. The main change between the two versions is the longer front part of the fuselage of the IIb version, which means that the cockpit offers more space. Most of the models were built in the late 1970s and early 1980s.

Construction and flight performance

The Grob G 104 is a mid-decker made entirely of glass fiber reinforced plastic with a T-tail unit , the wings of which are equipped with continuously adjustable flaps ; the flaps are overlaid with the ailerons in version IIb (the flaps move the ailerons with them). The position of the flaps is displayed in the airspeed indicator. The gap covers on the upper sides of the wing for sealing the rudder are flexibly resin-coated.

In terms of performance, the Grob G 104 (Speed ​​Astir) was comparable to the other aircraft in the racing class (15 m FAI ) at the time. The glide ratio is about 41. Compared to the LS4 , the Grob G 104 shows similar flight performance. The gliding index is 105.

Technical specifications

Parameter	Data
crew	1
length	6.6 m (IIb: 6.8 m)
span	15.0 m
height	1.3 m
Wing area	11.5 m²
Wing extension	19.6
Wing loading	28-44 kg / m²
Glide ratio	40–41 (depending on wing loading)
Slightest sinking	0.57 m / s at 75 km / h (with maximum wing loading: 0.67 m / s at 90 km / h)
Load factor	+ 5.3 / −2.65 g (at maneuver speed = 190 km / h)
Empty mass	approx. 260 kg
Payload	110 kg (including parachute) + 10 kg in the overhead locker
Max. Takeoff mass	400 kg, with water ballast 515 kg
Max. Mass d. non-structural parts	260 kg
Top speed	270 km / h
Minimum speed	approx. 70 km / h (with water ballast 75 km / h, each with + 5 ° curvature and retracted air brakes)
index	105

See also

• List of aircraft types

Web links

• Type certificate Grob Sailplanes - EASA-TCDS-A.250 (PDF; 452 kB)

Individual evidence

1. ^ ^{A b} R. W. Simpson: Airlife's General Aviation . A guide to Postwar General Aviation Manufacturers and their aircraft. 2nd Edition. Airlife Publishing, 1995, ISBN 1-85310-577-5 , pp. 202 .