That number is a calculation based on an average. Its unfortunately not an official number. If you can find one I'd gladly use it. The average is based on Hucho's findings that you can take length X width and multiply by .81 and come up with a good approximation. Actual measurement is likely much more accurate. I'll actually be updating that list real soon with some additional Saturn info.
I had also changed my formula back (I was using a different one) that was comming up with a greater frontal area. The new calculation shows your xA as 22.6 ft^2.
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