Northern Wisconsin advertiser. [volume] (Wabeno, Wis.) 1898-1925, 1912-11-08

moving horizontally upward in opposltion "
the surface of the planes should be fahlng 'h1
the support Of the flying machine Is suooenis
diminished to that extent, and the aeropan
drops Again. II the aviator Ia travelling aga.hs
a stratum of wind of a definite speed anu
purposely descends, reaching an air pelt Vi wv
speed or altered direction, these changes may -
duce the force of the air striking the surfaces
of his nIares and this drop in pressure may
s cause his machine to fall speedily earthwaiu
This is another proof Of course, of the lmasih"i'
vacant places in the air. III
We must bear in mind that the proplen y.
the flying machine is quite distinct from tha' VI
the balloon The balloon floats because :.
either lighter than the air It d1splaces-"hen "
rises-or remains at fixed altitude because 'nel
is a perfect balance between its weight anu ',A'
of the air which it thrusts aside IL relnaihS
aloft whether drifting with the wind or pelhs
driven nv a motor The heavier than-air flying
machine on the other hand, is sustained IN hign'
only so long its movement Forward arousos
sufficient opposition the part or the ar 10 ll'
or to sustain it. When the propellers cease "
revolve the aeroplane starts earthWaro anu uio
aster can be avoided only by volplan1ng or per
forming sweeping spiral descent. maneuVer
of this sort is nothing more nor less than
modified drop. The safety OF the aeroplane
therefore when in midar, depends upon the nice
balancing of the machine and the proper equallz
ing of pressure upon the planes. Edd1es In the
air or any other disturbance which Will pr1ng
the aeroplane into conflicting atmospheric oelUS
or zones will imperil the stability OF the ma
chine and the life of the aviator unless ne Do
ever watchful and there are some or these con
dtions against Whlcn he cahiot suANi'n'1'
guard. -. -,
The fying machine in going ahead. hits the
air a succession Of rapid blows, and by TINS
causes an area Of compression which IS equal IN
the force of it's reaction to the weight or the
fying machine. The fact Of it is, this compress
sion actually affects volume of air equal In
weight to the air craft it sustans, and as CUBIC
foot of atmospheric air weighs only oS or
mound at the freezing point, little figuring VIII
show how wide is the area upon which the ava
tor must draw for his support
What happens then when the flying machine
has moved onward and the atmosphere tries TO
resume it's normal state? The reaction IS ike
the release of spring and the air acquires
vibratory motion-greatest In vertical olrecClon
akin to the prolonged holdings OF parity
water-soaked log after being hit blow But thls
is not ALL
We are living at the bottom OF ocean OF
air. and we are living in that region of the at
mosphere where it is densest Ihe natural ten
dency for the atmosphere is to fall when not
made lighter by heat and caused to rise. An
aeroplane shooting through this lower belt IS
substantially knocking out the foundations from
beneath the atmospheric columns reaching many
thousands of feet heavenward, and we have In
the air virtual duplication Of our bobong log
many many times repeated at every stage of
the onward movement of the flying machine and
the successive reactions of the compressed air
which has momentarily sustained that mechan-
tcal flight Isn't it clear, then that an aviator
when passing above or below another aviator
is either stumbling into air holes thus created
or producing a similar condition to menace his
nearb7 fellow? The airman advancing at the
greater speed will produce the wider area of dis
turbance and within any prescribed limit, the
more dangerous reaction
The flying machine when aloft is in a state OF
decidedly delicate equilibrium, otherwise the
mere hexing of wing tips would be incapable of
correcting its horizontal position. Any change
of pressure the extremity of its wings is equfva-
lent to adding or reducing the weight at the one
or the other tip, and upsetting movement Is
started 1t is quite probable that even though
one aeroplane may be a full hundred feet above
or below another still the greater speed of the
overtaking machine may sufficient down
ward movement on the part of the air TO over
weight suddenly wing of the other machine.
This is certainly what happened in the case OF
Lieutenant Brez Mile Dutrieu and number OF
others.
The task set the investigators is that of find
ing how wide is the region OF agitation created
by a flying machine in flight and, with this
knowledge to prescribe the proper distances
which avators must observe when approaching
one another
Fortunately, the flying machine is now studied
in the laboratory. and recent progress in expert
mental aerodynamics is doing much toward
clearing the way for safe advance in the near
future but the public must be patient and n
must realize that flying is full of hazards at
best and we are really scarcely much more than
upon the Threshold of this wonderful ecieEoe.