Here is my GEV video
some details:
Made with coroplast ( 32cm wide x 41 cm long ) ,
brushless motor 50 g , kv =1100
8" x 4.5" GWS propeller ,
2200 mAh 3S battery.
The vertical stabilizer and rudder are from a Radian Glider.
CG at 24% of the actual wing, (disregard the front side bumpers , they do not count ) , CG is at 13.5 cm from the front bumpers
The wing plank has a 4 degree angle of attack . The thrust line is at 0 degree , i.e. parallel to the ground.
The exhaust section of the duct ( 120 cm^2 ) , is smaller than the intake ( 210 cm^2 ) .
Also, made certain that a large fraction of the prop wash went directly into the lower duct., by lowering the motor as much as possible.
eventually made it into a four wheeler, as shown in the CG picture.