What are these crevices below the wing of B-52 bomber?
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I think that this crevice which you have noticed is the hinge line for its aileron. This might not actually be an aileron hinge line, as later model B-52s don't actually have ailerons - if this is a later model B-52, then this may just be the remnants of what the ailerons once were.
My answer is based upon this diagram of a B-52D.
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2$\begingroup$ And what would be the purpose of a "flipper aileron"? Perhaps just to provide control "feel" (tactile aerodynamic feedback) that was lacking with the spoilerons alone? And why were the "flipper ailerons" deleted from later models? Maybe there's another ASE question somewhere in there, if it's not yet already answered somewhere. Feel free to grab it anyone, I've got to run- $\endgroup$ – quiet flyer Nov 27 '20 at 16:59