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In this video at the 2:40 minute mark there is a relatively clear image of the rear of a Blackbird. This is a new view - at least for me. Are those "ports" and, if so, what are they venting? IF not, what are they?

Here is a snapshot at roughly that time: enter image description here

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  • $\begingroup$ please update the link. $\endgroup$
    – William Martens
    Commented Jan 17, 2023 at 21:12

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According to the SR-71 handbook section 6-11, these are fuel dump vents (outer) and fuel tank pressure relief vent (center).

Since this is copyrighted material, I will not include a screenshot of the page, please follow the link above to view the page.

In some models these vents were relocated, because a camera system air conditioning appendage was added to the tail of the plane

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    $\begingroup$ In action $\endgroup$
    – mins
    Commented Dec 13, 2021 at 14:41

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