Boeing Transonic Truss Braced Wing Concept

RavenOne

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These ultra-thin folding wings measure more than half the length of a football field! Our new Transonic Truss-Braced Wing concept is revealed at #aiaaSciTech today. #TheFutureIsBuiltHere Read more: http://bit.ly/2VAnHks
 

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sublight is back

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They already fly at mach .80- so now they'll do it more efficiently at a higher altitude? I wonder if that will make the Q corner a lot more hairy.....
 

Moose

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Along with returning to the more market-friendly .80 mach, visually this is a lot less clunky looking which may help people buy-in. Interesting timing on this release too, wonder if they're closer to a real TTB product than previously indicated.
 

litzj

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structural and L/D characteristics could be advantage

but aerodynamic stability can be issue.

still it is not as radical as box wing type
 

Avimimus

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Isn't the goal a better L/D ratio, the truss as a way to increase rigidity to allow that, and the technological advance to push the braced wing concept to higher speeds than previous proposals?
 

malipa

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The aerodynamic stability isn't actually more of an issue with this concept. It is really not that more different than a more standard design, when looking at the planform, and thus the aerodynamic stability is comparable. The problem is the aerodynamic interaction between the truss and the wing, possibly creating structural instability (created by buffeting for instance when at trans-sonic speed). And they want to have very long slim wings to dramatically increase the aspect ratio, decreasing the lift dependent drag component.
 

malipa

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The difference in offset between the truss and the main wing is rather small and both act pretty near the aerodynamic center and center of mass of the aircraft. That is not the case with the box wing structure, where the surfaces lay quite a part further away from the center of mass and aerodynamic center of the aircraft.
 

litzj

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sferrin

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Avimimus said:
Isn't the goal a better L/D ratio, the truss as a way to increase rigidity to allow that, and the technological advance to push the braced wing concept to higher speeds than previous proposals?
Isn't that basically what a diamond wing does? Why a truss over a diamond wing? Is one better than the other?
 

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litzj

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sferrin said:
Avimimus said:
Isn't the goal a better L/D ratio, the truss as a way to increase rigidity to allow that, and the technological advance to push the braced wing concept to higher speeds than previous proposals?
Isn't that basically what a diamond wing does? Why a truss over a diamond wing? Is one better than the other?
compared to pure diamond wing, it has less aerodynamic center change via flight condition change

and it can prevent downstream interference by positioning brace part under the main wing

for diamond wing, dowmstream part should be at the downstream of the front wing, and cannot be at the under side because of landing gear interference
 
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