The Coanda Effect has been discovered in1930 by the Romanian aerodynamicist Henri-Marie Coanda (1885-1972). He has observed that a steam of air (or a other fluid) emerging from a nozzle tends to follow a nearby curved surface, if the curvature of the surface or angle the surface makes with the stream is not too sharp.
The Coanda UAV, propelled by an electric engine, uses the Coanda effect to take off vertically, fly, hover and land vertically ( VTOL ). There is no big rotor like on an helicopter and the flight is very stable and safe for the surrounding.
More info at: jlnlabs.online.fr/​gfsuav/​index.htm

Comment by Knuckles904 on November 14, 2010 at 5:18pm
how is yaw counter balanced I wonder? counter rotating props?
Comment by Mathew krawczun on November 14, 2010 at 7:52pm
no this design only has one prop.

yaw is controled by the little white fins you see on the curve surface in the video. they'r contorled by a servo inside the bell sheped bottom and trun to deflect air.

Moderator
Comment by Sgt Ric on November 14, 2010 at 8:33pm
I have been following Jean-Louis's work with this type of Coanda design for years.

He has been a true leader in this field.

Developer
Comment by Jean-Louis Naudin on November 15, 2010 at 12:09am
Hello, there is no counter rotating prop, the yaw counter balanced is by a rim of small rudders placed around the circumference of the saucer.

The rim of rudders are fully controlled by a gyro connected in serie with the receiver.
Regards, Jean-Louis

Developer
Comment by Jean-Louis Naudin on November 15, 2010 at 12:17am
Here, some photos taken during outdoor flights.

Regards, Jean-Louis
Comment by Richard Hirst on November 15, 2010 at 1:28am
This is a commercial one...they are planning a manned version too...

.http://www.entecho.com.au/main_category.php?id=27

Developer
Comment by Jean-Louis Naudin on November 15, 2010 at 2:31am
This Entecho device seems similar in appearance to the Coanda effect saucer, same hull shape BUT this device doesn't use the true Coanda effect...
"a steam of air (or a other fluid) emerging from a nozzle tends to follow a nearby curved surface, if the curvature of the surface or angle the surface makes with the stream is not too sharp."
Below a CFD simulation of a true Coanda effect saucer:

Regards,
Jean-Louis
Comment by Michael Lingg on November 15, 2010 at 5:39am
I just read about a government(? sorry, going from memory) design of a Coanda effect saucer in Popular Science being developed in Great Britan I believe. If memory serves it was something like 20 pounds and propelled by a gasoline engine.

Developer
Comment by Jean-Louis Naudin on November 15, 2010 at 8:45am
The first Coanda saucer effect used as drone has been built and tested in flight in 1940 by Viktor Schauberger (1938-1957). The name of this device was "the Repulsin", see an original photo below:


The Repulsin device is an Electro-Aero-Dynamic device (E.A.D.) and uses two effects :

- The Coanda Effect, a pure Aerodynamic effect based on the Bernouilly's principle,
- The ElectroDynamic effect : The high speed vortex in the vortex chamber produces an electric charges separation effect, called "the diamagnetic effect " by Schauberger.

These two effects combined create the so-called "implosion effect".

When the main electric engine is started, the Coanda effect begins to create a differential aerodynamic pressure between the outer and the inner surface of the primary hull. At a higher speed, the vortex chamber becomes a kind of high electrostatic generator due to the air particles in high speed motion acting as an electrical charges transporter. The "Repulsin" will begin to glow due to the strong ionization effect of the air. Now, we have all the ingredients for a continuous and strong Aether Flow along the main axis from the top to the bottom of the craft.....

Regards,
Jean-Louis
Comment by Jakob Kaye on December 2, 2010 at 2:48pm
I really think your coanda effect saucer is the future, do you work with GFS Projects? I observed a flight test quite a few years ago at their workshop but the company seem to have now disappeared. I was told there would be DIY plans of his design published at some point but I never saw any..

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