'This developer of the first practical helicopter built & flew the first 4-engine aircraft in 1913'
Sikorsky
POTPOURRI: This developer of the first practical helicopter built & flew the first 4-engine aircraft in 1913
This developer of the first practical helicopter built & flew the first 4-engine aircraft in 1913
This developer of the first practical helicopter built & flew the first 4-engine aircraft in 1913
POTPOURRI
Sikorsky
POTPOURRI