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PZL SM-4 Łątka

The PZL SM-4 Łątka 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.

Design and development
In 1960, a design team led by Jerzy Kotliński at the Polish WSK PZL-Świdnik factory began work on a new short-range light helicopter, which was given the designation SM-4 Łątka. WSK PZL-Świdnik had previously license-built Soviet Mil Mi-1 helicopters, designated SM-1, starting in 1955. They had also designed and built the PZL SM-2 derivative of the Mi-1; the SM-4 was the first completely original aircraft design to be developed by them. ==Specifications (performance estimated)==
Source: Wikipedia ↗
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