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I'm trying to figure out typical AR values for a T-tail configuration (at the conseptual design phase). Working with Raymer I found this table:

enter image description here

I can see the typical AR values for the vertical tail but I cant find anything about the horizontal one. The only info that I got is that it should be lower than wing's AR. The aircraft that I'm interested about is a twin turboprop.

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  • $\begingroup$ I'm not sure if JAWA has tail-aspect ratios. You could also find planform images of the aircraft you have in mind and calculate the aspect ratios. Here's a list of T-tail aircraft $\endgroup$
    – pho
    Commented Jul 2, 2020 at 18:11

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Hmmmm.

enter image description here [Source] enter image description here

ATR42=6:1

enter image description here [Source] enter image description here

Dash8Q400=4:1

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I'm not aware of any reason why the aspect ratio of the horizontal stabilizer of a T-tail needs to be any different than that of a conventional tail. I always interpreted the dash in Raymer to mean that the h-stab should be sized similarly in T-Tail as in a conventional. Apparently this source shares my interpretation.

Due to the end-plating effect, the vertical tail in a T-tail is more aerodynamically effective, resulting in generally shorter v-stab. However, for the same surface area, T-tail would have a heavier structure to cater for uneven load cases on the h-stab and the need for a bullet fairing.

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