DRAW the FORCES   of a  KITE

Draw the diagram of forces of a kite let determine the aerodynamic thrust of the windl on the kite.


The diagram also lets better understanding of the behavior of the kite.

 Here is the general arrangement of the forces of a kite. The forces as shown are the resultants of all forces. However, some may prefer to draw apart the forces of a tail or a drogue.
These forces are when the kite is at equilibrium
R is the retaining force on the line
P is the thrust of the wind
      which components are lift L and drag Q
W is the weight
a is the incidence angle of the kite
q is the line angle at the bridle.
To be successful, it must be set up:
the incidence angle a,
the pull on the line, R
the line angle q
the weight of kite, W
the position of the center of gravity.
- the bridle point


¤ Fly the kite at 20/30m
¤ Measure the line angle
¤ Let's walk leeward until being aligned with the outline of the kite and measure the incidence angle


¤ Scale the kite.
¤ Hold the kite by the bridle ring. The vertical from the ring gives the center of gravity on the spine.
The spine on cellular kites is through the center of the cells.

¤ Draw the spine and the bridle
¤ Incline at incidence angle



¤ Draw the vertical through the center of gravity
¤ Draw the line through the bridle ring inclined as the line angle.
These two lines intersects at J.
¤ Draw the vectors
on the vertical line JK = W
on the oblique line  KM = R



¤ From M draw MJ and extend until the spine

¤ Show the aerodynamic thrust P = JM.

Graphically, size P, its location on the spine, its inclination.