Heinonen HK-1 Keltiäinen
Juhani Heinonen · Finland · first flew 1954 · light aircraft
The Heinonen HK-1 Keltiäinen is a Finnish single-seat, single-engined sport aircraft of the 1950s.
Recognition (WEFT)
| W — Wings | Low-mounted, straight |
|---|---|
| E — Engines | 1 × piston, nose-mounted |
| F — Fuselage | 5.35 m fuselage |
| T — Tail | Conventional |
WEFT is AircraftIQ's four-point recognition method — how it works.
Spot it by:
- Single-seat low-wing all-wooden monoplane
- Pilot under a sliding perspex canopy
- Fixed tailwheel undercarriage with a steerable tailwheel but no brakes
An aerobatic sport monoplane of wooden construction with an aspect ratio of 6.8.
Specifications
- The Heinonen HK-1 Keltiäinen has a length of 5.35 m (18 ft).
- It has a wingspan of 6.86 m (23 ft).
- Its maximum speed is 215 km/h (134 mph).
- Typical crew: 1.
Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.
History
Juhani Heinonen, an aeronautical engineer who had worked for Valmet and Finnair, designed it. The prototype was built at the glider school at Jämi and first flew in August 1954.
Variants
Three examples were built. It was powered by a 65 hp Walter Mikron inline engine driving a two-bladed propeller, and had split flaps.
Where you'll see it
On 10 July 1957 Heinonen flew the HK-1 non-stop from Madrid to Turku, 2,844 km in 17 hours 1 minute, setting a class distance record that stood until 1984. The aircraft is now in the Finnish Aviation Museum near Helsinki Airport.
Related aircraft
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