Polk County news-gazette. (Benton, Tenn.) 190?-191?, 1914-09-03

knowing the angle of that ascent, may be equal,
perous small wind disk is associated with
the mechanism Of the stabzer. This little plate
Is so swung that 1t always feels the full force
of the arriving air current as the aeroplane
sweeps on 1t is associated with pressure meas
uring mechanism, and this pressure corresponds
to speed in miles per hour. This velocity is ind
Gated by a little dial in front OF the aviator, so
that he can know, if watchful how fast his craft
is going and whether not there is lifting force
enough against the aeroplanes wings to keep
the machine safely afoat
When, ascending the pilot turns the nose of
his machine upward he offers a broader surface
of his wings to the oncoming air, and what he
thus loses in movement forward he gains in rise,
just like the motion of kite when you pull the
string and square its face more nearly with the
wind. Now, the aeroplane must move onward at
prescribed minimum speed; this velocity differs
with different machines and below this speed the
air current has not force enough to sustain the
craft Should aeronaut, seeking to climb too
fast. halt the speed forward in order to increase
the rapdity of rise, he is to start plunging
backward If that velocity drop so little below
the prescribed minimum required for support
Here is where the little wind gauge plays its
vital part
Automatically, should the aviator be needless
or unaware of his peril when within certain
limit of the demonstrating speed, the wind gauge.
through associate mechanisms turns the tail
planes so that that end rises. while the head of
the machine dips, and instead of soaring, starts
upon earthward yolpane. In that earthward
sweep the craft acquires increased speed gains
renewed supporting pressure, and is once more
under safe control
This control, however is taken out Of the hands
of the pilot pro TEN. until the required safety
speed has been thus obtained This same pro-
vision provides against that much feared con-
tngency, the stopping of the propulsive motors
during fight. 1t accident of this sort that
almost cost the lives OF an aviator and his wife
here little over week ago. BY desperate ef-
forts that pilot managed to keep the zigzag vol
planning Of his craft within bounds and by
great good luck the machine landed In the water.
In sweeping around upon circular fight, es-
pecially If the turn be at all short the ordinary
aviator has a multiplicity of things to do: He |
must regulate his wing tips or ailerons function
the tail plane and, at the same time, manipulate |
the rudder The trouble is that the rudder and |
the tail plane become somewhat interchangeable |
in their actions because of the heeling angle as
sumed by the craft. This is tlckish work and
has caused many accidents and cost number of
lives, With the Sperry stabilizer this hazard is
The pilot will have nothing to concern
himself about except the path he wishes to follow
the little horoscopes will look out for the rest
as has been amply proved during the exacting
tests in France when the shifting OF the pilot and
his mechanic set up disturbing forces that would
have meant certain destruction In an unstabilized
aeroplane
Now you know just what Mr.. Sperry has done
or aviation. He has mastered a very hard prob
en- and he has made his mastery complete.