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Vertical tail sweep optimization

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addaon

Well-Known Member
Supporting Member
Joined
Feb 24, 2008
Messages
3,976
Location
Kanab, UT
Roskam describes an approach for optimizing the sweep angle of a vertical tail with fixed aspect ratio and mounting point. Basically, increasing the sweep decreased dCLa, and increases moment arm; increase sweep until these factors are balanced.

His accompanying image, though, shows this at a reasonable cruise angle of attack. Shouldn't this be performed at the most critical flight condition for tail authority, and isn't this usually Vs0 for for a single engine? If so, this leads to a pretty substantially different result, as much as 10° different.
 
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