In order to achieve the highest efficiency using compressed air, many manufacturers of compressed air knives utilize the Coandă effect to improve compressed air knife design over other types of knives and nozzles.
The Coandă effect, a phenomenon that causes a fluid to be attracted to another object, named after Henri Coandă.
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Other designs have followed, such as the American Vought V-173 / XF5U "Flying Flapjack", the British GFS Projects flying saucer, or the British "S.A.U.C.E.R." ("Saucer Aircraft Utilising Coanda Effect Reactions") flying saucer, by inventor Alf Beharie.