The St. Louis Republic. [volume] (St. Louis, Mo.) 1888-1919, 1903-08-30
FRoNT VIEW OF
EZRSHP WITH
WINGS EZETzTED.

vi6ed into two strands and one carried for
ward to q horizontal position, a pull Of one
pound on this line would support the kite
and added load Sufficient to make up four
pounds dropped vertically from The other
half Of the divided kite line
When the kite line Is released to a dis
tance Of forty feet or more II begins to
assume the form Of catenarv under the
Influence Of the force OF gravity and the
pressure Of the air currents.
The curve deepens with increasing length
Of line till the angle OF the line no longer
bears much relation to the efficiency OF the
kite itself.
Deductions from these data are OF con-
siderable importance. because they demon
strate that pressure or pull OF one
pound properly applied will hold six pounds
or more in the air.
The principle involved In analogous to that
in lever OF the second class.
When weights are added and the kite 10
made to do work phenomena appear some
what different from those when 1t flies free,
mainly because Of the formation of a ne.
center OF gravity at an increased distance
from the center Of pressure, which greatly
increases the Stability Of the apparatus.
For Developing the greatest lifting power
in the kite the load should be arranged at
q point directly in line with the flying
string
Apparently the most stable point in con-
Junction With high efficiency Ii where the
kite string is fastened to the hanger.
Surprising the hanger to be properly ar
ranged and adjusted. the movement OF the
load toward the rear tends to lower that
end and throw the forward end upward,
thus increasing the area Of the sustaining
surface exposed to the action Of the afr,
resulting. however. in a loss Of lifting en-
cheney. unless the wind speed is increased
to restore the original angle Of Incidence.
1noo nj fha
rent the body Of the kite drops backward,
as shown In figure Z, until sufficient cross
section of the wind stream Ii covered to
re-establish equilibrium.
This kite Is therefore automatic in q large
! degree.
The pressure against the kite surface
varies directly with the area OF the cross
section Of the stream of air detected and
with the square Of the velocity of the wind
| or speed OF the kite through the air.
IL Is evident that IL the kite Is ADVANCING
through the air Its speed should be added
to the wind speed and deducted II losing
| ground.
center OF air pressure the lift tits the kite
forward. splitting some OF the wind, and
| with the lessened support the apparatus.
| properly balanced, will start of down an
| inclined plane of air on journey back to
earth and against the wind.
MANEUvER MAY BE
REPEATED AT WILL
This maneuver may be repeated at will
by simple rigging. which consists OF a
pulley attached to the hanger at the point
! where the string is usually fastened and
/ then running the kite string from the for
| ward tip Of the kite down through the
| pulley to the operator.
The weight. OF about twenty ounces for
a six-foot kite. varying somewhat with the
, strength OF the wind, should be fastened TO
the new or second hanger a distance OF
six or eight inches from the pulley and
sufficiently far from the kite tip to leave
| a little slack when the weight II drawn
up to the pulley
1t will be readily understood that ~ Ions
as the tension necessary to hold the kite in
| the air ID maintained on the kite string
the weight win be held closely to the pui.
ley. when. all the forces being In equilib.
RUM. the apparatus seeks and holds q DO.
sition at the greatest altitude permissible
by the length Of line and the general en-.
cheney.
| With the kite well up in the air auicl
release OF the tension ON the line lets the
weight fall forward and away from thu
pulley by force Of gravity . distanc,
gauged by q knot in the string.
the shlft1ng OF the load thus forWaft
turns the kite into an airship, sailing for
ward with the flying line slack and undo,
ifs own steam. the kinetic energy sturet
when the kite and weight were raised aloft
In this instapce the weight Of the Nit,
was seventeen Sunces and tbs load was o
iron and LEAD weighing nineteen ounces q
! total Of two and . quarter pounds
H now. third hanger = fastened 70 ON
Up y The ~ Of Ii. kits. tbs oshsr snd .
the string tied to the weight IN such
manner - - divide tie load when Tie ton
sion = reloaesd on the main nne, u
W9igh4 WIN swing to the side, ~ wen q