Airfoil twist
- Forum Veteran
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I'm not sure whether this thing have been already touched or not but this is the question. I've noticed that Raptor's wing is somehow convoluted somewhere starting from midsection to the wingtip, leading edge is flexed clearly down and trailing edge is flexed up. I guess F-35 has more or less the same feature. I havnt seen it on F-18s, F-16s, not quite sure about F-15.
What tahat actually is and what it's for? I'm guessing it has to be benefitial from an aerodynamic standpoint.. I dont know, less induced drag, supercruise? Im wondering.
It's quite well visible on a frontal plane
What tahat actually is and what it's for? I'm guessing it has to be benefitial from an aerodynamic standpoint.. I dont know, less induced drag, supercruise? Im wondering.
It's quite well visible on a frontal plane
- Senior member
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Though this won't fully address your question (especially as to whether or not this is the reason why the F-22 has it), but this is known as washout.
https://en.wikipedia.org/wiki/Washout_(aviation)
https://en.wikipedia.org/wiki/Washout_(aviation)
My guess would be that the twist has to do with the angle of attack various parts of the wing stall at.
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- Elite 2K
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Another benefit of twist in the wing is reduced structural weight, both in the wing and the fuselage. There are two kinds of wing twist, static and elastic. Static is the twist with zero load on the wing. Elastic is the twist due to load on the wing. For F-16, static is 3 degrees from wing root to tip. Elastic can be as much as 4 degrees, so total twist can be up to 7 degrees.
So how does that save structural weight? As mentioned earlier the tip area has a lower angle of attack and lift due to the twist. That moves the center of lift inboard and reduces wing bending moment and fuselage bulkhead moment for the required total wing lift.
So how does that save structural weight? As mentioned earlier the tip area has a lower angle of attack and lift due to the twist. That moves the center of lift inboard and reduces wing bending moment and fuselage bulkhead moment for the required total wing lift.
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This feature is more prominent from the back IMO, and I've often wondered why it's there too.
Gives it an edgier look IMO. From the front or back, she looks real mean...
Gives it an edgier look IMO. From the front or back, she looks real mean...
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