• Source: Heinonen HK-1

The Heinonen HK-1 Keltiäinen is a Finnish single-seat, single-engined sport aircraft of the 1950s. Three examples were built. The first was used by its designer to set a class distance record in 1957 that stood for 18 years before being beaten.




Design and development


Juhani Heinonen, an aeronautical engineer who had previously worked for the Valmet aircraft factory at Tampere, and then for Finnair, designed a single-seat, single engined aerobatic sport aircraft, the Heinonen HK-1. It was a low winged monoplane of all-wooden construction, powered by a Walter Mikron air-cooled inline engine rated at 48 kilowatts (65 hp) driving a two-bladed propeller. Split flaps were fitted to the wings, while the aircraft had a fixed tailwheel undercarriage, with a steerable tailwheel but no brakes. The pilot sat under a sliding perspex canopy. A prototype was built at the glider school at Jämi, first flying in August 1954.




Operational history


The HK-1 was displayed at the 1955 and 1957 Ypenburg airshows. On 10 July 1957, Heinonen flew the HK-1, fitted with an additional ventral fuel tank, non-stop between Madrid, Spain and Turku in Finland, covering a distance of 2,844 kilometres (1,767 mi) in 17 hours 1 minute, setting a class world distance record for aircraft of less than 500 kilograms (1,100 lb) take-off weight. For this flight, Heinonen was awarded a Louis Blériot medal by the Fédération Aéronautique Internationale. This record was not broken until 2 July 1975.
The aircraft is now preserved at the Finnish Aviation Museum near Helsinki Airport.




Specifications


Data from Jane's All The World's Aircraft 1956–57General characteristics
Crew: 1
Length: 5.35 m (17 ft 7 in)
Wingspan: 6.86 m (22 ft 6 in)
Height: 2.08 m (6 ft 10 in)
Wing area: 7.0 m2 (75 sq ft)
Aspect ratio: 6.8:1
Empty weight: 250 kg (551 lb)
Gross weight: 400 kg (882 lb)
Fuel capacity: 58 L (13 imp gal; 15 US gal)
Powerplant: 1 × Walter Mikron III air-cooled inverted four-cylinder inline engine, 48 kW (65 hp)
Performance

Maximum speed: 215 km/h (134 mph, 116 kn) at sea level
Cruise speed: 185 km/h (115 mph, 100 kn)
Range: 700 km (430 mi, 380 nmi)
Rate of climb: 4.5 m/s (880 ft/min)
Take-off distance to 15.25 m (50 ft): 240 m (790 ft)
Landing distance from 15.25 m (50 ft): 350 metres (1,150 ft)




See also



Aircraft of comparable role, configuration, and era

PIK-11




Notes






References

Kata Kunci Pencarian:

• Selegilin
• Heinonen HK-1
• Heinonen (disambiguation)
• HK1 (disambiguation)
• Continental O-190
• List of aircraft (H–He)
• Finnish Aviation Museum
• 2024 Finnish Cup
• 2023 Finnish Cup
• Selegiline
• Pharmacology of selegiline