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THE STATIC PERFORMANCE OF GROUND EFFECT MACHINES WITH ASPECT RATIOS OF 1/3, 2/3, 1-1/2, AND 3.
Final technical rept.,
HYDRONAUTICS INC LAUREL MD
Pagination or Media Count:
The results of an experimental investigation of the static pitch performance of aspect ratios 13, 23, 1-12, and 3 ground effect machine models with interior nozzles are presented. The investigations consisted of the measurement of the lift, moment, plenum chamber pressure, and rate of air flow to the models at three heights and for various pitch angles. These studies show that the four configurations are statically stable and have restoring moments at all of the heights for which tests were conducted. Observations of the flow beneath the model were made in an effort to gain an understanding of the role of the interior jets on the stability of the models. Comparisons of these experimental results and those for an aspect ratio 23 model without an interior nozzle are made with those predicted using the thin jet theory in an effort to determine the validity of the theory. It is shown that the thin jet theory satisfactorily predicts the lift and moment of a ground effect machine at high heights only. Author
APPROVED FOR PUBLIC RELEASE