The Coanda Effect
The Coanda Effect has been discoveredin1930 by the Romanian aerodynamicist Henri-Marie Coanda(1885-1972). He has observed that a steam of air (or a otherfuild) emerging from a nozzle tends to follow a nearby curvedsurface, if the curvature of the surface or angle the surfacemakes with the stream is not too sharp.
If a stream of water is flowing along asolid surface which is curved slightly from the stream, the waterwill tend to follow the surface.
Now, a very simple demonstration :
If you approach gently a curved shaped surface (like the shape of the primary hull of the Repulsin) under a stream of water (see below ) :
The water follows the surface of the curved shape, this is the Coanda Effect (see below) :
The Coanda Effect works with any of ourusual fluids, such as air at usual temperature, pressures andspeeds.
