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Old 7th January 2018 | 23:30
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megan
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Joined: Mar 2005
: Military
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Page 116 may answer your question, at least in part.

http://www.dtic.mil/dtic/tr/fulltext/u2/776998.pdf

A better question to have asked is why the CP-140 are rounded and the L-188 Electra, ostensibly the same airframe, had square.
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