Reduced efficiency in hovering due to the missing thrust augmenters Unprotected rotors which increase the risk of contact with the environment or with the people around Increased risks to damage the vehicle when take-off and landing due to the oscillation of the fuselage Difficult to achieve multi-passenger vehicles with this configuration It offer an uncomfortable position of the passenger and reduced visual field in take-off and landing Immediately after take-off/landing the fuselage attitude is almost vertical and in the case of side wings this position can create a dangerous instability, which cannot be corrected by the propulsion system For landing must be used a soft surface to avoid the deterioration of the body During take-off it appears friction between the vehicle and the ground It cannot perform simple missions that, for example, can be easily performed by small helicopters due to the vertically inclined body while hovering
Because of the propulsion configuration the take-off and landing are not vertical but inclined Unfortunately, even this technology has some disadvantages: Several years ago, Opener proposed a very simple and attractive solution with BlackFly, shown in Figure 2. Opener already demonstrated the viability of this idea with different prototypes having thousands of hours of flying tests. Unfortunately, in the case of Custer design, the channel area is reduced and the positive high lift effect is limited. He was awarded 27 patents for his discoveries between 19 he built three different twin-engine aircraft in the 1940s and 1950s with his trademark curved ducts to channel air around the rotating propellers.
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Interested in aviation but not a pilot, Custer began a series of experimental aircraft designs incorporating large channels in the wings, which has been likened to a half-barrel shape. He was stunned and fascinated to see the storm suck the roof off the barn and carry it away. Willard Custer came up with the idea of reversing the normal method of powered flight: instead of using the engines to push the aircraft through the air, he used the engine to suck the air across and through the wing, creating lift immediately when engine power was added.Ĭuster got the idea for his creation in the 1920s when he took refuge in a barn during a severe storm. A design that led to rapid development for the present concept is the Custer Channel Wing, a largely forgotten attempt to create extremely short takeoff and landing (STOL) airplanes nearly a century ago, as is shown in Figure 1.
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