(from the article `jet engine`) The helicopter is designed to operate for substantial periods of time hovering at zero flight speed. Even in forward flight, helicopters rarely ...
Found on http://www.britannica.com/eb/a-z/t/93
A turboshaft engine is a form of gas turbine which is optimized to produce free turbine (see graphic at right) shaft power, rather than jet thrust. In concept, turboshaft engines are very similar to turbojets, with additional turbine expansion to extract heat energy from the exhaust and convert it into output shaft power. Turboshaft engines are co
Found on http://en.wikipedia.org/wiki/Turboshaft
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