A hydrocopter is an amphibious propeller-driven
catamaran with a boat-like hull, small wheels and pontoon skis (as in a
seaplane). An aircraft engine with a propeller and air rudder powers this
lightweight vehicle over water, ice, snow and land.
Used in arctic coastal regions during "rasputitsa" or great spring thaw, when ice hinders boats and cannot support ground vehicles, it is a low cost alternative to hovercrafts and helicopters and capable of rescue operations in weather conditions well beyond the safety limits of other vehicles. – Wikipedia
1961 cover from Sweden depicting the First
service of Hydrocopter from Söderöra to Blidö. The cover was
carried on 2.2.1961. The cachet depicts a Hydrocopter used of the purpose of
the mail carriage, which was fitted with a Volkswagen motor engine,
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