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In the photo of the 787 at the EAA, what is what looks like a pendulum hanging of the tail?

From the dreamliner latest article from Les Abend.
One can't quite see the whole picture, but it is a conic object hanging by a cable from the tip of the tail. What is that?

answers (1)
aerofede's picture
Editor

It is a small parachute-like device, I believe it is used to evaluate the air flow movements during flight test. But I'm not sure.

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