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][a] 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)