re: Sell them at full price!
It would be interesting to compare the efficiency of a helicopter and one of these Coanda-effect flying machines.
The link says that the model works with the following power requirements.
GFS N-01B specifications :
Diameter : 1 meter
Weight : 1.8 kg
Engine : Electric powered with a high efficiency brushless motor (outrunner) ( 800 Watts )
Battery : High Power Lithium Polymer ( LiPo 6S1P 4000 mA )
Speed controler : 70 A opto 3P
Gyro : GY 401 Piezo type with heading lock feature
Servos : 5 mini-servo MG
Receiver : 7 channels
The test setup is interesting also.
http://jlnlabs.online.fr/gfsuav/coanda/index.htm