RESEARCH ON ANNULAR NOZZLE TYPE GROUND EFFECT MACHINE OPERATING OVER WATER; PRELIMINARY STUDY OF AIR FLOW PATTERNS. APPENDIX: DIMENSIONAL ANALYSIS,
CALIFORNIA UNIV BERKELEY HYDRAULIC ENGINEERING LAB
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The annular nozzle ground effect machine model was mounted rigidly on a carriage with its base plate horizontal. Air was supplied by an air compressor driven by a variable speed DC motor. The air flow rates were measured with a calibrated 2 inch orifice in the inlet pipe to the blower. The carriage was run at forward speeds varying between 0 and 3.5 knots. The height above the water level before the blower was turned on was set at 12 in., 1 in., or 1-12 in. Air flow rates between 7 and 15 lbsmin 0.115 and 0.256 lbssec were used.