Used by the Soviet Red Army during the Winter War and World War II, the aerosan is a type of propeller-powered snowmobile that runs on skis. First developed early in the 20th century, aerosans were valued for their high mobility in deep snow and on frozen water bodies and came to be used for a number of functions, including communications, mail deliveries, medical aid, and border patrolling in northern Russia. Some of the first aerosans may have been built by what famous aircraft designer? Discuss
Source: The Free Dictionary