hello a question

My name is lina and I am new in this thing but I'm trying to learn, now I'm
trying to make the model of an helicopter that I need for my project, but
there are some things that I don't understand, this is

fuselage: This defines a tubelike structure.  It will be given an even
          mass and aerodynamic force distribution by the solver.  You
          can have as many as you like, in any orientation you please.
          ax,ay,az: One end of the tube (typically the front)
          bx,by,bz: The other ("back") end.
          width:    The width of the tube, in meters.
          taper:    The approximate radius at the "tips" of the fuselage
                    expressed as a fraction (0-1) of the width value.
          midpoint: The location of the widest part of the fuselage,
                    expressed as a fraction of the distance between A and B.
I don't know how to define my fuselage, I know that the helicopter have  full
lenght of fuselaje=1220mm(48.03'') and full width fuselage=140mm(5.51'')
(The helicopter is an aeromodel titan raptor 50) but don't know how to
relate it, the part that I have most confuse is in ax,ay,az: One end of the
tube (typically the front),  bx,by,bz: The other ("back") end. I don´t know
how to made this part. and all, haw I say I'm new in this but I hope that
you can help me.

Thanks a lot.

LINA.

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