Harakka

Harakka
Harakka II glider at Suomen Ilmailumuseo (Finnish Aviation Museum), 2001
Role	Primary glider
National origin	Finland
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.[1] 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,[2] becoming a standard piece of equipment in the clubs.[1][3]

In 1946, Raimo Häkkinen and Juhani Heinonen from Polyteknikkojen Ilmailukerho redesigned the Harakka to strengthen it.[4] This improved version became known as the Harakka II or PIK-7.[4][5][6] In 1948, a single example of a more radically redesigned version designated Harakka III flew.[7] This had the framework that supported the tail replaced by a single boom.[7]

Examples of the Harakka I and Harakka II are preserved at the Suomen ilmailumuseo[8] and the Karhulan ilmailukerho Aviation Museum,[1][6] with the sole Harakka III also preserved at the latter museum.[7]

Variants

• Harakka I - initial version (based on Oleg Antonov's Us-4 aka Antonov A-1)
• Harakka II - strengthened version (several dozen built)[4]
• Harakka III - version with redesigned tail (1 built)[7]

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 m^2 (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)

See also

• Antonov A-1

Notes

1. "Harakka I (H-12)"
2. "Grunau 9 ja PIK-7 Harakka, kerhon 1940-50-lukujen alkeiskoulukoneet"
3. Hardy 1982, p.74
4. "PIK-sarjan lentokoneet"
5. Taylor 1989, p.726
6. "Harakka II (H-57)"
7. "Harakka III/PIK-7 (H-34)"
8. "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.