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This is taken from Aerospace web
http://www.aerospaceweb.org/aircraft/fighter/s37/ "The advantages of forward sweep have long been known as such wings offer lower wave drag, reduced bending moments, and delayed stall when compared to more traditional wing shapes. Unfortunately, forward sweep also induces twisting strong enough to rip the wings off an aircraft built of conventional materials. To solve this problem, the Su-47 makes use of composite materials carefully tailored to resist twisting while still allowing the wing to bend for improved aerodynamic behavior. " "However, Sukhoi has apparently decided to abandon the forward-swept wings of the S-37, and the future production model will return to a more conventional wing layout. If true, Sukhoi may have reached the same conclusion as NASA did following testing of the X-29--the benefits of forward-swept wings are just not worth the extra cost and complexity associated with their design and manufacture." Curt "James Dandy" wrote in message m... Pardon my ignorance on all matters concerning modern aviation but just why the hell would you want to sweep a wing forward? Doesn't that make any aircraft unstable? If so, why would any pilot feel safe in it? Has anyone ever made one work? James Dandy |
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