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Glasflugel 604

 

glasf604

 

The 604 high performance single-seater by Hanle and Prosser is a 22m span version of the Kestrel 17, and in fact originated as a design study for a similar two-seater sailplane.
 
Originally intended as a development vehicle for a two-seat high performance sailplane, the 604 has a three-piece wing weighting more than 272 kg/ 600 lb.; just the center section weights 160 kg/ 353 lb. The wing has six flaps, the outer pair of which move at a 2:1 differential with the ailerons. Large spoilers deploy from the upper wing surface only, and there is a tail chute for added approach control.
 
The 604's wing consists of a centre section incorporating the fuselage top, and two outer panels joined to the centre section by the Hutter-Hanle method. The fuselage is 5ft 5in longer than the Kestrel 17's to give improved directional control with the longer span wing; the cockpit canopy, which is slightly shorter than the Kestrel's, is hinged to open upward and aft. There is a manuallly retractable monowheel with a brake, and a fixed tailwheel. Structurally the 604 is very similar to the Kestrel 17, and can carry up to 220lb of water ballast.
 

 Glasf-604-3

 

The prototype made its first flight in April 1970, only four months after construction began, and took part in the 1970 World Gliding Championships at Marfa, Texas, taking sixth place; it later took second place in the 1974 World Championships at Waikerie, Australia.
 
Only 10 604s were built but the type gained a number of competition successes and has set several world and national records, including one for speed over a 300km triangle, set by W. Neubert of West Germany in Kenya in March 1972 with a speed of 95.3mph, and the ladies' 100km triangular speed record of 79.1mph set by Adele Orsi of Italy in August 1975.
 
Glasf-604-2
 
Wing span: 22m / 72 ft 2 in
Wing area: 16.26 sq.m / 174.7 sq.ft
Length: 7.6 m / 24 ft 11.25 in
Height: 1.67 m / 5 ft 5.75 in
Empty Weight: 420 kg / 926lb
Payload: 180 kg / 397 lb
Gross Weight: 600 kg / 1230 lb
Wing Load: 36.9 kg/sq.m / 7.57 lb/sq.ft
Water Ballast: 0 kg / 0 lb
Max speed: 135 kt / 250 km/h / 155mph (smooth air)
Stalling speed: 34.5 kt / 64 km/h
L/DMax: 49 at 98 kph / 53 kt / 61 mph
MinSink: 0.50 m/s / 1.64 fps / 0.97 kt at 45mph / 39 kt / 72 km/h
Aspect ratio: 29.8
Airfoil: Wortmann FX-67-K-170/150
Seats 1
No. Built 10
 

 Glasf-604-ld

 

 

 

 

 

 


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