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Pi local static pressure A series of tests has been completed in which Pjet suckdown and fountain forces and pressures were measured on circular plates and twin-tandem-jet AM generic STOVL (short takeoff and vertical landing) configurations. The tests were conducted using a Ap small-scale hover rig, for jet pressure ratios up to 6 and jet temperatures up to 700°F. The measured suckdown force on a circular plate with a central jet S was greater than that found with a commonly used empidcal prediction method. The present data T showed better agreement with other sets of data. The tests of the generic STOVL configurations were conducted to provide tome and pressure data with a parametric variation of parameters so that an empirical prediction method could be developed. The effects of jet pressure ratio and temperature T were found to be small. Lift improvement devices were shown to substantially reduce the net suckdown forces.

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