PIK-11

The PIK-11 Tumppu ("Mitten") was a single-seat, single-engine sport aircraft developed in Finland in the 1950s.[1] It was a low-wing, cantilever monoplane of conventional design with an enclosed cockpit and fixed, tailwheel undercarriage.[2] It was to be the first powered aircraft produced by Polyteknikkojen Ilmailukerho,[1][lower-alpha 1] with the objective being building an aircraft for club use that was cheap to build and easy to fly.[2]

PIK-11 Tumppu
PIK-11 Tumppu in Finnish Aviation Museum
Role Sport aircraft
National origin Finland
Manufacturer Polyteknikkojen Ilmailukerho
First flight 15 March 1953
Number built 4

Design work was started in 1948 by Kai Mellen and Ilkka Lounanmaa under the direction of Professor Arvo Ylinen.[2] The first of four machines made its first flight on 15 March 1953.[2] The prototype is preserved at the Finnish Aviation Museum,[4] and another example was still listed on the Finnish Civil Aviation Authority registry in 2008.[5]

In the early 21st century, a flying replica was under construction, to be powered by a Rotax 912 engine.[6]


Specifications

Data from Jane's all the World's Aircraft 1955-56[7] & [8]

General characteristics

  • Crew: 1
  • Length: 5.5 m (18 ft 1 in)
  • Wingspan: 8 m (26 ft 3 in)
  • Height: 1.65 m (5 ft 5 in) tail down
  • Empty weight: 238 kg (525 lb)
  • Gross weight: 373 kg (822 lb)
  • Powerplant: 1 × Continental A65-8 4-cyl. horizontally-opposed air-cooled piston engine, 48 kW (65 hp)

Performance

  • Maximum speed: 220 km/h (140 mph, 120 kn) at sea level
  • Cruise speed: 170 km/h (110 mph, 92 kn) at sea level
  • Landing speed: 80 km/h (50 mph; 43 kn)
  • Never exceed speed: 280 km/h (170 mph, 150 kn)
  • Range: 700 km (430 mi, 380 nmi)
  • g limits: +5.5 -1.5
  • Rate of climb: 5.5 m/s (1,080 ft/min) initial
  • Time to altitude: 1,000 m (3,300 ft) in 3 minutes 10 seconds, 5,000 m (16,000 ft) in 31 minutes
  • Wing loading: 41 kg/m2 (8.4 lb/sq ft)
  • Power/mass: 0.13 kW/kg (0.0787 hp/lb)
    Take-off run: 300 m (980 ft) to clear 15 m (50 ft)

Notes
  1. A Grunau Baby sailplane had been converted into a motorglider in 1949 as the PIK-10 Moottoribaby.[3]
  1. Taylor 1989, p.726
  2. "PIK-sarjan lentokoneet"
  3. Green & Pollinger 1965, p. 33
  4. "Item Collection: Aircraft"
  5. Summary of the Finnish Aircraft Register 2008, Part I page 44
  6. <"Lentokoneen rakennusprojekti PIK-11 'Tumppu'"
  7. Bridgman, Leonard (1955). Jane's all the World's Aircraft 1955-56. London: Jane's all the World's Aircraft Publishing Co. Ltd.
  8. "Lentokoneen rakennusprojekti PIK-11 "Tumppu"" (in Finnish). Retrieved 20 April 2014.

References
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