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The above question is usually presented as an advantage for H-tail configurations. How does it help?

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  • $\begingroup$ This is two questions @Zaber, please split them up. $\endgroup$ – GdD Aug 4 '18 at 10:47
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A propeller accelerates the air flowing through it in order to create thrust. This acceleration is highest at low speed.

The acceleration will increase the dynamic pressure at the tail if it is in the slipstream. A higher dynamic pressure will cause a proportionally higher aerodynamic force. A H-tail will, therefore, only be in the slipstream if two engines are mounted ahead of it, like in two- or four-engined designs with wing-mounted propellers. Also, by placing the area of the vertical low, a H-tail offers better dynamic flying characteristics.

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