1/11/2024 0 Comments Hang glider forumImagine the problems that would arise in a flying machine that did not tend to point in the same general direction as it was actually moving through the airflow! This dynamic-this tendency to yaw or "weathervane" to meet the airflow head-on rather than sidewise- is known as "yaw stability", "directional stability", or "weathervane stability". This same function is provided by the vertical tail on more "conventional" aircraft. A built-up rigid wing like this would need a trailer, or a car-top box as big as as parking space, for safe transportation.įirst and foremost, hang gliders have a swept-wing or delta-wing shape so that they point into the "relative wind", like a weathervane. This is not stability as such, but if the inherent stability of the glider is not enough sometimes (such as in heavy turbulence), the dive recovery system kicks in to help restore normal flight.Ī conventional wing with no sweep (the Quicksilver HG) would need a tail assembly, to be stable. The sweep also gives us the option of improving the dive recovery system, using washout struts to support the trailing edge at the tips (behind the CG). Any aircraft that is balanced outside of the "normal" CG range is uncontrollable, and even un-flyable. I had a rigid wing (the Fledgling), and even with the sweep, the CG range was very small. The resulting sweep in the wings makes the Center of Gravity range fairly broad (that is, user-friendly). We use ribs (and the cut of the trailing edge) to make the triangle more wing-like. Nah! It just folds up into a long skinny bag, better than more complex designs. Qwert圓20 wrote:Whats the physics behind it? Does it provide more lift? Or stability?
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