Harakka

Harakka
Harakka
	Harakka II glider at Suomen Ilmailumuseo (Finnish Aviation Museum), 2001
General information
Type	Primary glider
National origin	Finland
History
First flight	February 1945

The Harakka ("European magpie") was a primary glider produced for pilot training in Finland in the 1940s.

Development

Its design was typical of this class of aircraft, a "keel" with a pilot's seat suspended beneath a high, strut-braced monoplane wing, and carrying a conventional empennage at the end of an open framework. First flown in February 1945, the type was built from plans by Finnish gliding clubs and soon replaced earlier primary gliders such as the Grunau 9, becoming a standard piece of equipment in the clubs.

In 1946, Raimo Häkkinen and Juhani Heinonen from Polyteknikkojen Ilmailukerho redesigned the Harakka to strengthen it. This improved version became known as the Harakka II or PIK-7. In 1948, a single example of a more radically redesigned version designated Harakka III flew. This had the framework that supported the tail replaced by a single boom.

Examples of the Harakka I and Harakka II are preserved at the Suomen ilmailumuseo and the Karhulan ilmailukerho Aviation Museum, with the sole Harakka III also preserved at the latter museum.

Variants

Harakka I - initial version (based on Oleg Antonov's Us-4 a.k.a. Antonov A-1)
Harakka II - strengthened version (several dozen built)
Harakka III - version with redesigned tail (1 built)

Specifications (Harakka II)

Data from "Harakka II (H-57)"

General characteristics

Crew: One pilot
Length: 5.72 m (18 ft 9 in)
Wingspan: 10.60 m (34 ft 9 in)
Height: 1.30 m (4 ft 3 in)
Wing area: 15 m² (161 sq ft)
Empty weight: 92 kg (200 lb)
Gross weight: 200 kg (440 lb)

Performance

Maximum speed: 117 km/h (73 mph, 63 kn)
Maximum glide ratio: 10.5:1
Rate of sink: 1.2 m/s (236 ft/min)

Notes

1 2 3 "Harakka I (H-12)"
↑ "Grunau 9 ja PIK-7 Harakka, kerhon 1940-50-lukujen alkeiskoulukoneet"
↑ Hardy 1982, p.74
1 2 3 "PIK-sarjan lentokoneet"
↑ Taylor 1989, p.726
1 2 "Harakka II (H-57)"
1 2 3 4 "Harakka III/PIK-7 (H-34)"
↑ "Aircraft on display" [sic]

References

"Aircraft on display". The Finnish Aviation Museum website. Archived from the original on 2008-12-19. Retrieved 2009-01-10.
"Grunau 9 ja PIK-7 Harakka, kerhon 1940-50-lukujen alkeiskoulukoneet". Vaasan Lentokerho website. Retrieved 2009-01-10.
Hardy, Michael (1982). Gliders and Sailplanes of the World. Shepperton: Ian Allan.
"Harakka I (H-12)". Karhulan Ilmailukerho website. Archived from the original on 2008-05-09. Retrieved 2009-01-10.
"Harakka II (H-57)". Karhulan Ilmailukerho website. Archived from the original on 2008-05-09. Retrieved 2009-01-10.
"Harakka III/PIK-7 (H-34)". Karhulan Ilmailukerho website. Archived from the original on 2012-02-24. Retrieved 2009-01-10.
"PIK-sarjan lentokoneet". Polyteknikkojen Ilmailukerho website. Retrieved 2009-01-08.
Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.

[H-12-1] 1 2 3 "Harakka I (H-12)"

[Vaasan-2] "Grunau 9 ja PIK-7 Harakka, kerhon 1940-50-lukujen alkeiskoulukoneet"

[Hardy-3] Hardy 1982, p.74

[PIK-4] 1 2 3 "PIK-sarjan lentokoneet"

[JAE-5] Taylor 1989, p.726

[H-57-6] 1 2 "Harakka II (H-57)"

[H-34-7] 1 2 3 4 "Harakka III/PIK-7 (H-34)"

[SI-8] "Aircraft on display" [sic]