A Problem Definition for the Ejector Flap STOL Concept.
AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO
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The report addresses the application of cold thrust augmentation - i.e., the ejector flap - to the STOL requirement. The approach is to examine the results of a preliminary analysis in light of new information which was not originally considered. The original preliminary analysis, examined the potential of this concept by modifying an existing aircraft design to accept an ejector flap mechanism. It was found that in addition to an increase in STOL performance, the device could also yield performance gains by leaving the ejector flap on during other flight modes, i.e., climb, loiter and cruise. The optimum ejector geometry was in the low area ratio, low thrust augmentation ratio region. This latter finding was in direct contrast to other ejector efforts of current interest. The conclusion drawn is that this concept will probably yield most benefit for STOL missions requiring extended loitering of climbing time. Ejector on operation does not look promising for high speed cruise. Author Modified Abstract