The PZL SM-4 Łątka (Polish: Dragonfly) was a prototype three-seat helicopter of the 1960s, developed by WSK PZL-Świdnik in Poland. Of largely conventional design and construction, a single prototype was built, but was not flown as a result of engine problems.
The PZL SM-4 Łątka (Polish: Dragonfly) was a prototype three-seat helicopter of the 1960s, developed by WSK PZL-Świdnik in Poland. Of largely conventional design and construction, a single prototype was built, but was not flown as a result of engine problems.
Source: Wikipedia "PZL SM-4 Łątka" · CC BY-SA 4.0
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