Is there a good way to include subscript(s) to a letter within a 'text' command?  Currently I do this by specifying the coordinates, letter, and font for the letter, then specify the coordinates, number and font for the subscript.  However, with this method the letter and subscript can be compressed if the viewing interval is compressed or expanded.  

Is there another way to include letters with a subscript in a text command?

I want to plot a cone in 3-d for any given axis vecttor, center and eccentricity.

Given a  vector v (parallel to the principle axis) and a center point c,

and generating vectors u(beta) orthogonal to v for 0 < beta < 2pi,

and real positive parameters a and b 

I want to plot the hyperboloid  c + a*v*sec(alpha) + b*u(beta)*tan(alpha)

for -pi/2 < alpha < pi/2.

I am able to generate something of a plot, but can't control the size and appearance.