Lewiston evening teller. [volume] (Lewiston, Idaho) 1903-1911, 1904-08-24

AODEL SHOWING ELINDT PROPELLERS.
ing her speed, will be carried OF from
the stern by the two keels; secondly.
the propellers are rendered more DOW
erful because their diameter, and there.
fore grasp on the water, is greater.
In every propeller now being used
on steamships there is a certain
amount of lost power in the center of
the whirling blades. An electric fan
is form of propeller. It forces air
out instead Of water. II you place
your hand in the center of an electric
fan you will find that there is no air.
The breeze comes from the outside
edges Of the blades. Mr.. Flindt, no.
ticing this, set to work to obviate the
difficulty. Clearly a propeller with
nothing but blades on the outside edge
gripping the water would be more pow
erful than the present kind Accord
ingly he placed solid metal wheel on
his propeller shaft and set his blades
on it. That form of propeller answer
ed the purpose, but brought on another
difficulty. The wheel on the propeller,
being large. caught the water and tend
ed to retard the progress Of the boat
taking away the advantage gained by
the more perfectly adjusted blades.
Something must be done to cover up
the hub wheel. With this problem con-
fronting him Mr.. Flindt evolved the
new style Of ships bottom. BY arch
ing his vessels bottom the whole
length he secured flow Of water un-
der the center Of the boat equal to that
along the sides and established bear
ing for his propeller equal in diameter
to the hub wheel upon which his pro-
peller blades were fastened.
The Deutschland's propeller blades
are fourteen feet long from the center
Of the shaft to the tip Of the blade.
The whole circle which the propeller
cuts is more than eighty-four feet. Mr..
Flindt's new form of propeller is If
teen feet long from the center Of the
shaft to the tip Of the blade. The
whole circle is more than ninety feet.
II the Deutschland's propeller were in
creased q foot the powerful engines
driving it would not be able to accom-
plish ninety revolutions q minute,
which they now do. 1t IL estimated
that they would be able to make about
sixty revolutions, and, although the
power would be increased on account
of the larger area Of blades. the revo-
buttons would be diminished, and the
speed would be no greater. II as great.
With the new propeller foot larger
attached to the Deutschland under the
new construction the $4,000 horsepower
engines, says Mr.. Flindt. would drive
the thirty foot blade at ninety revolu-
tions to the minute. The clutch on the
water would be greater. and therefore
the speed would be increased with the
same machinery.
Another factor toward greater speed
which the inventor also claims for his
construction is the saving in friction
caused by the shortening Of the shaft.
The propellers on ocean liners are all
out at the end of the boat. The en-
gines are located in the center. and
the shaft Is necessarily long connecting
these two points. The propellers on
Mr.. Flindt's boat are midway up from
the stern, and the shaft Is therefore
but half as long. The advantage gain
ed in less weight and friction Is OBJ
vious to any one conversant with ma
chinery