35 Many attempts have been made this
end, mostly based the, use independ
ent devices,for the express purpose facili
tating and insuring the start -and finish of
the aerial journey, but the operativeness of
40 the arrangements proposed not conclu
sively demonstrated and, besides, they are
objectionable, constructively otherwise, to
such extent that builders commercial
apparatus have far not considered them
45 sufficient value depxrt from present
practice.
The utility the aeroplane means of
transport materially lessened and its com
mercial introduction greatly hampered ow
ing the inherent inability the mecha-
5 nism readily rise and alight, which an
unavoidable consequence the fact that the
required lifting force can only produced
by more less rapid transistory move
ment the planes foils.
- Application filed September 1921, Serial No.
lo ith tiv itu f
. Taking a
Special case for illustration, the thrust
under given conditions ten pounds per
horse-power, then hundredfold increase 90
the mass air, accompanied, reduction
of its effective velocity one-tenth, would
produce force one hundred pounds per
horsepower.
A lity ttr tc
th lic ility ein ,
a tly fro m
th tio ity 105
p ill
t ilin device,
w ile ire tio p
o dow ilib riu sily
tu reo er,. actual ex-
10 perience the minimum speed for ascension
and landing considerable fraction that
in full flight, and the principles design
do not admit very great advance in
this respect without sacrifice some de-
15 sirable feature. 1,655,113
UNITED STATES PATENT OFFICE. 1928. imperative has be
come devise _some, plan doing away
with these limitations the aeroplane that
the consensus expert opinion charac-
80 terizes the problem one the most press-
' ing and important and its practical solution
is feagerly awaited those engaged the
development the art, well the gen
eral public..
METHOD AERIAL TRANSPORTATION. For this reason planes of
very large area, high lift wing-sections, de
flectors the slip-stream the propeller,
or analogous means, which might helpful
in these operations}do not afford the remedy
■
2
0 sought. lth is
id ite few rts e
55 eav red rio s,
n success een ach iev i
d tly e
en also r
ta ristic s
o evice lla accep ted so
th its tio tio . This indispensable high velocity,
imperilling life and property, makes neces
sary equip the machine with special
appliances and provide suitable facilities at
the terminals the route, all which en-
25 tail numerous drawbacks and difficulties of
a serious nature.Patented Jan. 499,519, and Great Britain April 1921.u ject.. llo ire tly e
fu flu id
d fifty 70
y ity ith e
th e
p asses elo itie e
p rtic lic lly
p ressed 75
T
O tic e
a tio is
From these equations evident that a
great thrust can obtained with compara
tively small amount power simply in- 85
creasing the aggregate mass the particles
and reducing their velocities.
.
NIKOLA TESLA, NEW YORK, Y.
T fly is
k firs attra tiv ily be- 05
cau ssib rry . ;
M tly ssio tte tio s
b een lic id
o tin ,
50 les rtic i
z lsio tis rily accom
p lish tru lity e
p lle alone.
w eem ssa . But the seemingly great gain
thus secured little significance avia- 95
tipn, for the reason that high speed of
travel generally essential requirement
which can not fulfilled except by
propelling the air high velocity, and
that obviously implies relatively small 100
thrust
