Omar, Just came across your request for "V" tail information and hope this helps. I've used this several time and it's worked for me...

Good luck..

Regards,
Ron

V-TAIL DESIGN - AREAS & ANGLES

The design of a V-tail equivalent of an orthodox stabilise r and fin.

It is assumed that the vertical (fin) and horizontal (stab.) areas for the conventional empennage are already known, perhaps from previous experience, or from using some design criteria. The requirement is to determine, for the V-tail configur ation:

1.the equivalent V-tail area,
2.the angle between the V-tail and the horizontal.

The diagram represents a view looking along the centre line of the aircraft, the length of each line is proportional to a surface area.


F = the desired fin area,
S = the desired stab. area,
V is the area of each of the V-tails,

x = the angle between the V-tail and the horizontal.

The basic equations for each side are:

1.Vcos^2(x) = S/2
2.Vsin^2(x) = F/2, therefore,
3.(x) = arctan . square root(F/S), for both sides together (from 1 & 2):

i.(F + S) = 2V(cos^2(x) + sin^2(x))
ii.since cos^2(x) + sin^2(x) = 1, then 2V = F + S, ie., the total wetted areas are equal

Example:

Suppose that F = 50 and S = 100 sq. ins.

thus, c alculating the area:

V = 150 / 2 = 75 sq. ins, (ie., the area of each half of the V-tail).

and, calculating the angle:

F/S = 0.5,

tan(x) = square root(0.5), = 0.707,

x = 35.26deg (or, in terms of the included angle of the "V", (180 - 2 x 35.26) = 109.5deg),