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This answer to Saturn V Small Rectangles On S-II Stage includes images and links related to the Saturn IB rocket. It shows what I think is an unwrapped representation of part of a circumference which proceeds from Fin 4, 5, 6, 7, 8, and then Fin 1.

Question: Did the Saturn IB have eight equally spaced fins around its circumference? If not what is it that this drawing is showing?

enter image description here

Indiscriminately cropped from here; [Source][2] APOLLO/SATURN CONSOLIDATED INSTRUMENTATION PLAN FOR AS-204/LM-1 pp 3-5 & 3-6

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Indeed it did as shown in this drawing.

enter image description here

Source (annotation mine)

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    $\begingroup$ I'd thought that I was misunderstanding the drawing, and the first images I pulled up all had smoke and fire obscuring the base of the rocket, so I was surprised to see that there really are eight giant fins here! I'll poke around the site to see if there is already an explanation for why this particular rocket has such a huge fin area. or not. $\endgroup$
    – uhoh
    Commented Feb 18, 2020 at 22:06
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    $\begingroup$ space.stackexchange.com/q/38188/6944 :) $\endgroup$
    – Organic Marble
    Commented Feb 18, 2020 at 22:18
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    $\begingroup$ @uhoh probably design heritage of the contractor :) justamericanautomobiles.com/images/1961-Chrysler.jpg $\endgroup$
    – Organic Marble
    Commented Feb 18, 2020 at 22:25
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    $\begingroup$ now that's what I'm talkin' about! $\endgroup$
    – uhoh
    Commented Feb 18, 2020 at 22:26
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    $\begingroup$ They were deservedly proud of it assets.hemmings.com/blog/wp-content/uploads//2018/06/… $\endgroup$
    – Organic Marble
    Commented Feb 18, 2020 at 22:30

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