Igor Sikorsky
He stuied the design of da Vinci
Igor Sikorsky invented the helicopter.
helicopter
Igor Sikorsky
Igor Sikorsky Paul Cornu
Igor Sikorsky
He stuied the design of da Vinci
Igor Sikorsky invented the helicopter.
helicopter
where did
Igor Sikorsky did.
Igor Sikorsky
Igor Sikorsky
igor sikorsky
HELICOPTER
Igor Sikorski built the first practical helicopter