PIK-5

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The PIK-5 was a training glider produced in Finland in the 1940s and 50s,[1] equipping the country's gliding clubs with an aircraft greater in performance than primary gliders but less than competition sailplanes.[2] The aircraft had a pod-and-boom configuration, with a high, strut-braced monoplane wing and a cruciform tail carried at the end of a tailboom that extended from a position high on the aft end of the pod.[3]

The prototype first flew in September 1946[4] and testing continued until it was badly damaged in a crash in summer 1948[5] Over the subsequent months, the wings were repaired, and a new fuselage constructed to a revised design. This was completed the following winter, and flights recommenced.[5] However, this aircraft, now known as the PIK-5B, was destroyed in a crash in summer 1951.[5] Again, it was rebuilt with modifications, particularly to the wing structure, resulting in the PIK-5C version.[5] This version first flew on 5 July 1952[5] and went on to become the pattern for around 30 similar machines that would be built over the ensuing years.[4]

Variants

  • PIK-5
  • PIK 5A
  • PIK-5B
  • PIK-5C

Specifications (PIK-5C)

Data from [6]The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II[7]

General characteristics

  • Crew: 1
  • Length: 6.4 m (21 ft 0 in)
  • Wingspan: 12.4 m (40 ft 8 in)
  • Wing area: 14.7 m2 (158 sq ft)
  • Aspect ratio: 10.4
  • Airfoil: Göttingen 533
  • Empty weight: 120 kg (265 lb)
  • Max takeoff weight: 210 kg (463 lb)

Performance

  • Stall speed: 45 km/h (28 mph; 24 kn)
  • Never exceed speed: 190 km/h (118 mph; 103 kn)
  • Rough air speed max: 120 km/h (74.6 mph; 64.8 kn)
  • Aerotow speed: 20 km/h (12.4 mph; 10.8 kn)
  • Winch launch speed: 90 km/h (55.9 mph; 48.6 kn)
  • Terminal velocity: with full air-brakes at max all-up weight 180 km/h (112 mph; 97 kn)
  • g limits: +4 -2
  • Maximum glide ratio: 18 at 60 km/h (37.3 mph; 32.4 kn)
  • Rate of sink: 0.85 m/s (167 ft/min) at 52 km/h (32.3 mph; 28.1 kn)
  • Wing loading: 14.3 kg/m2 (2.9 lb/sq ft)



Notes

  1. ↑ Taylor 1989, p.726
  2. ↑ Hardy 1982, p.74
  3. ↑ "PIK-sarjan lentokoneet"
  4. ↑ 4.0 4.1 "PIK-5c Cumulus (OH-151)"
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Tiusanen 1952, P.12
  6. ↑ "PIK-5c Cumulus (OH-151)". Karhulan Ilmailukerho website. Retrieved 2009-01-09. 
  7. ↑ Shenstone, B.S.; K.G. Wilkinson (1963). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (in Primarily English with French and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 180–191. 

References

  • Shenstone, B.S.; K.G. Wilkinson (1963). The World's Sailplanes:Die Segelflugzeuge der Welt:Les Planeurs du Monde Volume II (in Primarily English with French and German) (1st ed.). Zurich: Organisation Scientifique et Technique Internationale du Vol a Voile (OSTIV) and Schweizer Aero-Revue. pp. 180–191. 
  • Hardy, Michael (1982). Gliders and Sailplanes of the World. Shepperton: Ian Allan. 
  • "PIK-5c Cumulus (OH-151)". Karhulan Ilmailukerho website. Retrieved 2009-01-09. 
  • "PIK-sarjan lentokoneet". Polyteknikkojen Ilmailukerho website. Retrieved 2009-01-08. 
  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. 
  • Tiusanen, Keijo (1952). "PIK-5c". Ilmailu (9): 12. 
Aircraft produced by Polyteknikkojen Ilmailukerho and the Helsinki University of Technology
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