PIK-5

PIK-5
PIK-5b in Finnish Aviation Museum
General information
Type	Training glider
National origin	Finland
Manufacturer	Polyteknikkojen Ilmailukerho
Designer	Kaarlo J. Temmes
Number built	34
History
First flight	September 1946

The PIK-5 was a training glider produced in Finland in the 1940s, and 1950s, ^[1] equipping the country's gliding clubs with an aircraft greater in performance than primary gliders but less than competition sailplanes. ^[2]

The PIK-5 had a pod-and-boom configuration, with a high, strut-braced monoplane wing and a cruciform tail carried at the end of a tail boom that extended from a position high on the aft end of the pod. ^[3]

History

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 Karhulan Ilmailukerho website : PIK-5c Cumulus (OH-151), ^[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 (120 mph, 100 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. "PIK-5c Cumulus (OH-151)"
5. 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 English, 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 English, 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.