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TAF VIII-2, four-seater Tandem Airfoil Flairboat Typ Jörg II, built in 1983. Following the F&E and test period, Dipl. Ing. Günther Jörg was awarded with the "Phillip Morris Scientific Award" for the Transportation System for the future. Another TAF VIII-2, built in 1994 was given to a Japanese private citizen.
Ekranoplan A-90 Orlyonok. A ground-effect vehicle (GEV), also called a wing-in-ground-effect (WIGE or WIG), ground-effect craft/machine (GEM), wingship, flarecraft, surface effect vehicle or ekranoplan (Russian: экранопла́н – "screenglider"), is a vehicle that is able to move over the surface by gaining support from the reactions of the air against the surface of the earth or water.
Vincent Burnelli received US Patent no: 1,774,474 for his "Airfoil Control Means" on August 26, 1930. [5] Simple flat end-plates did not cause a reduction in drag, because the increase in profile drag was greater than the decrease in induced drag. [6]
The airfoil is a unique design, which the XL2 shares with its predecessor the Europa. This is a Don Dykins airfoil, designated as a "Dykins 12%", because the wing's maximum thickness is 12% of the chord. The airfoil is a semi-symmetrical, laminar-flow design. The stall warning system is a voice annunciator that says "stall, stall". [4]
The shape of the trailing edge is of prime importance in the aerodynamic function of any aerodynamic surface. A sharp trailing edge is always employed in an airfoil. [3] George Batchelor has written about: “ ... the remarkable controlling influence exerted by the sharp trailing edge of an aerofoil on the circulation.” [4]
The wing has a rounded trailing edge to tangentially eject the air through the Coandă effect thus causing lift. [2] The increase in velocity of the airflow over the wing also adds to the lift force through conventional airfoil lift production. [3] The trailing edge of a CCW showing the blowing slot and tangential coanda airflow.
[1] [2] [dubious – discuss] [citation needed] The tubercle effect works by channeling flow over the airfoil into more narrow streams, creating higher velocities. Another side effect of these channels is the reduction of flow moving over the wingtip and resulting in less parasitic drag due to wingtip vortices .
Production variant with 15 metre wingspan and wider cockpit. 0.62 m (2.03 ft) in width, 0.81 m (2.66 ft) in height. [4] Discus-2T "Turbo" variant with 15 metre wingspan and a 15.3 kW (20.5 hp) SOLO 2350 2-stroke, 2 cylinder sustainer engine. Discus-2c Production variant with 15 metre or 18 metre wingspan. Discus-2cT