Eagle River review. [volume] (Eagle River, Wis.) 1890-1927, 1914-09-04

knowing the angle of that ascent may be equally
perilous. small wind disk is associated with
the mechanismNof the stabilizer This little plate
is SO swung that it always feels" the full force
of the arriving air current as the aeroplane
sweeps on. 1t is associated with pressure meas
urfng mechanism, and this pressure corresponds
to speed in miles per hour. This velocity is indi
Gated by little dial in front of the aviator, so
that he 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 adoat.
When, ascending, the pilot turns the of
his machine upward he offers 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 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
afr current has not force enough to sustain the
craft. Should an aeronaut, seeking to climb too
fast halt the speed forward in order to increase
the rapidity of rise, he is to start plung1ng
backward If that velocity drop ever 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
unaware Of his peril when within q 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 volplane 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 tenn. until the required safety
speed has been thus obtained. This same pro-
vision provides against that much feared con-
tingency, the stopping of the propulsive motors
during flight. 1t was accident Of this sort that
almost cost the lives Of an aviator and his wife
here a little over week ago. BY desperate eff
forts that pilot managed to keep the zigzag vol
planning of his craft within some bounds and by
great good luck the machine landed in the water
In sweeping around upon circular flight es
pecially II 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 ticklish work and
has caused many accidents and cost number of
lives With the sperry stabilizer this hazard is
removed 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
tests in France when the shifting Of the pilot and
his mechanic set up disturbing forces that would
have meant certain destruction In an unstabiIized
aeroplane
Now you know just what Mr.. Sperry has done
for aviation. He has mastered very hard prob
lem, and he has made his mastery complete.