The Arizona copper camp., 1919-07-05
TESLA TELLS HOW 1000 MILES
CAN Be MADE BY FLYING MACHINE
Continued from page y


What the object of high yng Daily experience
that high speed and density incompatible that
furnish aircraft with four times the power to go
and the engineer knows that furnish eight
fast In other words height
of the air to the earth Thrtythre
feet below the surface the pressure every
feet the dnishe roughly pound per square
inch The two miles high 9s per inch
at mile 1888; onequarter mile 142 level 47
pounds, round numbers Is pounds per square inch
The unknown factor in the high altitude problem
altpan onefth density eght miles high equal push
five times faster oneh faster The of
pie equipment and good construction either gain
stanta If the former voyage between
London be made about three hours by going eight miles high
If the latter the made in about twelve
hours time surface speed of 200 miles hour
which is practically question of power
$40 my mind plain that the high altes will be dermn
factors long distance flying Greater speed distance
comfort and less danger the quiet environment less danger
because when double the time do risky thing double the
risk incurred less gasoene less weight and expense for if
ment permits 100 miles with twice the fuel formerly
used twenty-five miles economic gain obviously 100 per
cent because then 100 miles with the amount Of fuel
formerly consumed to fifty miles"
That aerial navigation at higher attitudes will undoubtedly
result great increase Of speed also the Of Nko Tesla
to whom took Mr. Motifs conclusions order get the opinion
this who has made lifetime study of the air medium for
the transmission electrical energy
n the propulsion of aerial vessels problems
different those in the
said Tesla The atmosphere may be kened ocean
magnes submarine vessel constructed like aeropan
Immediately realizes inefficient it would be- The energy used
three different first by skin friction; second making
third production of eddes principles, however the
resistance be divided into two parts which due to the
friction OF the medium and the other to It's sickness vcos
it termed The first proportonate the density the second
to this peculiar property Of the fluid.
Everybody will readily
the harder it push body through it. but might clear
to every what this other resstance vscotymeas
This will be understood if compare instance OIL
The lighter, sticky that greater
obstacle propulsion than water Air very vcuous substance
and that part Of resistance which due this quality consider
able We must take this latter resistance into account calculating
how aeroplan could fly in the upper
Now the idea is to fly at height where the air
fed therefore much less power required prope
chine through it. take the sealeve at 4 pounds
and the temperature Is degrees cengrad then without intro
ducng several corrections that would make for
pressrres different heights about follows
feet above level 18 pounds at mile 1245 pounds
two miles 105 pounds at eight miles 31926 pounds at fifteen
miles 0.8392 pounds and at twenty miles 0323 pounds
Condition Eight Miles Up
According these figures that height
eight miles the density of the air 0272 221OOh Of
that level fifteen miles OO57 and twenty only
OO219 or nearly 22-1000th of that a level
Let then that aeroplane height Of
eight miles where the of the will be only 3926 pounds
other words the density 02172 Of that level Since
the purely conal resistance proporionae the
density of the air it obvious that there other resistance
only about % cent of roughly oneh
would propel the vessel that height that
remely high speed Mr. Mott points would obtanab
And though the other resistance which the sickness
the medium will not be diminished at the ratio and there
fore the will be strictly proportion to the decrease Of
density of the nevertheless the total resistance will be reduced
% cent perhaps 80 per cent that there will be
great excess of power available for rapid flight
Even allowing for the decreased thrust of the propeller due
the the which be by
faster there still will be the very considerable gain the
aircraft will be propelled at higher speed.
of ncertudes still exist the theoretical treat
like this there number of factors which
affect the which complete
information
At an Altitude of Twenty Miles
~ that will be possible high fifteen or
twenty miles which the Mr. Mott At the
height of twenty miles there only about cent of
the instead Of Il which close the ground
there would be trouble the oxygen supply for
loft not TO aknfo