PIK-11

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

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] [a]} with the objective being building an aircraft for club use that was cheap to build and easy to fly. ^[2]

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

• "Aircraft". The Finnish Aviation Museum website. Retrieved 2009-01-12.
• Green, William; Pollinger, Gerald (1965). The Aircraft of the World (3rd ed.). London: Macdonald & Co. (Publishers) Ltd.
• "Lentokoneen rakennusprojekti PIK-11 'Tumppu'". Vaasan Lentokerho website. Retrieved 2009-01-12.
• "PIK-sarjan lentokoneet". Polyteknikkojen Ilmailukerho website. Retrieved 2009-01-12.
• "Summary of the Finnish Aircraft Register" (PDF). Finnish Civil Aviation Authority website. Archived from the original (PDF) on 2011-07-20. Retrieved 2009-01-12.
• Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions.