The high by-pass ratio tip-turbine driven lift and lift cruise fan offers the unique arrangement of a single type propulsion system fulfilling the many requirements for a VTOL application. This simple, compact, lightweight system offers high efficiency (low SFC) with the high static thrust at take-off required for VTOL and STOL operation. The lift cruise fan is a logical outgrowth of the tip-turbine lift fan technology backed by over 600 hr of testing since 1959. The significant test problem accomplishments for the cruise fan are presented as well as a representative VTOL transport-type application.
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