Of course the other alternatives if using fins would be to use fins off of Saturn I or Saturn IB. The problem with that is the fact that the Saturn I-F uses only two engine fairings, but then again, maybe a combination of fins would have been used-- say 2 Saturn I Block II fins in between the fairings, and Saturn V fins on the fairings themselves... That would work. Saturn IB fins would be more difficult to integrate, being swept, and less effective due to their smaller size. Putting a pair of them between each fairing also would create some weird aero-effects as the air being diverted by the fairing would impinge on the fin and be "trapped" between the fin and fairing, so I don't think that would work at all...

Here's another view of the Saturn V fins with dimensions...


And some more information on the Saturn I Block II fins which would work well centered between the fairings with Saturn V fins ON the fairings...


And this graphic has the relevant measurements for Saturn IB, including the fin dimensions at the bottom...


Later! OL JR

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