Aero Innovation AG

Annular ring wing Vario Copter

BG and EN .pdf presentation download here

The asymmetric reduction in the area of the oval wing maintains zero wingtip induced drag (37% of total drag), but reduces its lift. It is over-compensated by the wing's lower self-mass and lower skin friction drag, due to its reduced wing surface area and dimples (similar to the dimples on golf balls) on its underside. We obtained such definitive results from laboratory measurements on wind and hydrokinetic turbines with similar elliptical blades





























Drones are finding more and more diverse applications for different activities. They have a significant advantage because they do not need special take-off and landing sites. But their big disadvantage is that their lift is created only by the rotating propellers and they cannot passively gliding In order to fly, their propellers must rotate continuously and expend a lot of energy for their movement. Airplanes are significantly more energy efficient than drones, because their motors serve for horizontal flight, in which their wings create the lift force. But they cannot take off and land vertically. That's why we developed a UAV that has an annular wing under the propellers. Drone propellers create vertical thrust, but at the same time they also fan the upper surface of the wing. Thus, they accelerate the air flow above it, which lowers the air pressure above the wing and creates additional lifting force (Coanda effect). It synergistically adds to the wing lift force in horizontal flight. Therefore, an annular wing is significantly more efficient than the wing of any aircraft. The innovative DRON flies like a wing plane much more energy-efficiently, because the wing has no edges and no edge energy losses. At the same time, it has all the advantages of drones.The described is a world patent novelty, according to the official patent statement, which you can download from HERE   The patented VarioCopter takes-off and lands vertically. With the same propeller motors, flies horizontally as a winged aircraft, This is the most economical aerodynamic scheme that provides the most energy-efficient flying in all flight modes. Because the wing has no periphery - there is no any peripheral vortex air drag and therefore it has zero energy losses. At the same time, it has all the advantages of conventional drones. Oval ring wing Vario Copter is the world wide first rotorcraft with fixed annular wing. With fixed shaft propellers performed vertical takeoff and landing and fuel (energy) economy cruising, as well. The oval wing has significantly increased aerodynamic quality at the same wing span. This reduces its bending loads, as well as their amplitudes, which increases its service life. An oval ring-shaped wing is integrated into the structure of the Vario Kopter. Thanks to oval wing(s) 100% avoided wingtip energy losses. It increases Vario Copter range up to 35% with the same flight mass. With the same range payload increases up to 30% with the same fuel consumption. More download HERE

Comparison of the efficiency of annular wings


Typical wing airfoil is Selig S1223. In depend on horizontal speed (HS) we have tested 5 options. See the table:

HS Mach Number  v.s. Airfoil cross-sectional shape

0.07 0.12

0.11 0.16

0.15 0.21

a , d *

a , b *

c *

* see pictures of table 3, page 167

Ellipse ring wing shape (dimensions and mass)

X is the major ellipse axis, Y is the minor ellipse axis

Usually Y = (0.14-0.18)* X,   wing chord C = (0.15-0.25)*Y   [cm]

For ellipse calculations see at:

Wing mass = P(perimeter-of-ellipse)*d (wing airfoil thickness In average) * C *1.55

Carbon fiber composites have a density of 1.55 g/cm3 (epoxy resin 30%, carbon fiber 70%),

Lift on an elliptical annular ring wing
S is the wingspan in meters. Its lifting force at a speed of 60 m/s at sea level in newtons F = S*C*1650

The innovative DRON has an additional thruster or motors turning the propeller/s. It/They are mounted behind the annular wing on a movable bracket. It can rotate "up-down" and "left-right". This is how the airflow is directed at the required angle (thrust vectoring) and controls the movement of the UAV in all directions; The four propellers of the UAV in horizontal flight (lift force) also have a traction function. But their main function is to fan the upper surface of the annular wing to create additional lift (Coanda effect) allowing heavier and bulkier loads to be carried.

The partially overlapping rotors of the VarioCopter propellers increase their thrust by up to 15% and improve the stability and stability of the VarioCopter in all flight modes. More download HERE

The innovative spatial wing structures are obviously mechanically stronger and with a smaller wingspan for the same useful wing area. Therefore, it is recommended for them to use thinner and lighter aerodynamic profiles, but without violating their aerodynamic qualities. Thinner airfoils have less drag in the air. And it is the most important for all aviation transport consequences. It is known that the required power for motorized air machines (respectively consumption of current, fuel, etc.) increases with the third fold of their frontal drag. And this means that if this drag is reduced by 3 times, the required power will be 27 times lower. Therefore, innovative developments of thin airfoils are needed to improve their aerodynamic - hydrodynamic qualities. In order to achieve qualitatively new technical solutions for their washed/wetted surfaces, new materials and their re-spective technologies should be developed. The aim is to achieve better passive control with new structured materials, in composite structures, including by ener-gizing the boundary layer of the wetted surfaces. Such innovative solutions are fully applicable, not only to air vehicles, but also to land, water and underwater vehicles. As well as for any aerodynamic and hydrodynamic applications






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2020 - 2023 Copyrights by George Tonchev,

+359 876 403 727 

Inventors and patent holders

George Tonchev, Veselin Vassilev. Alexander Lupov.