<a href="https://en.wikipedia.org/wiki/Igor_Sikorsky" id="mwwg" rel="mw:WikiLink" title="Igor Sikorsky">Igor Sikorsky</a> performs the first successful single-rotor <a href="https://en.wikipedia.org/wiki/Helicopter" id="mwww" rel="mw:WikiLink" title="Helicopter">helicopter</a> flight.