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PIK-3
Role Sailplane
National origin Finland
Manufacturer Polyteknikkojen Ilmailukerho
Designed by Lars Norrmen and Ilkka Lounama
First flight 1950
Number built 40

The PIK-3 (Polyteknikkojen Ilmailukerho - Finnish institute of technology students flying club) was a sailplane produced in Finland in the 1950s and 60s.[1] It was designed to be a cheap and easy-to-build aircraft[2] to equip the country's gliding clubs as their standard single-seat machine.[3] It was a conventional design for its day, with a high wing and conventional empennage.[2][3] Construction was of wood throughout, skinned in plywood.[2][3]

Design work commenced in 1942,[4] but the prototype did not fly until 1950.[2][3] Aush Koskinnen refined the design for production as the PIK-3A and then further modified the design by replacing the flaps with air brakes, which was designated the PIK-3B.[2] [3][4]

By the end of the 1950s, a third modification of the original design was carried out by Olavi Roinisen[4] as the PIK-3C. This had completely new wings of 15 m (49 ft 3 in) to allow it to compete in the Standard Class.[2] The prototype flew on 20 May 1958,[2] [3] and the design was then modified for production by Suomen Ilmailuliito.[3]

Variants

  • PIK-3 - first prototype with wingspan of 13 m (47 ft 8 in)
  • PIK-3A Kanttikolmonen - initial production version of PIK-3
  • PIK-3B - PIK-3A with air brakes in place of flaps
  • PIK-3C Kajava - PIK-3B with new wings of 15 m (49 ft 3 in) span

Specifications (PIK-3C)

Data from ,[2]

General characteristics

  • Crew: One pilot
  • Length: 6.60 m (21 ft 8 in)
  • Wingspan: 15.00 m (49 ft 3 in)
  • Height: 1.0 m (3 ft 3 in)
  • Wing area: 13.1 m² (141 ft²)
  • Aspect ratio: 17:1
  • Wing profile: Göttingen 549/693
  • Empty weight: 215 kg (474 lb)
  • Gross weight: 316 kg (697 lb)

Performance

  • Maximum speed: 250 km/h (160 mph)
  • Maximum glide ratio: 30:1 @ 78km/h (42kts)
  • Rate of sink: 0.61 m/s (120 ft/min)

Comparable aircraft Schleicher Ka-6

Notes

  1. ^ Taylor 1989, p.726
  2. ^ a b c d e f g h Coates 1978, p.24
  3. ^ a b c d e f g Hardy 1982, p.74
  4. ^ a b c "PIK-sarjan lentokoneet"

References








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