Every evening, Wilmington daily commercial. (Wilmington, Del.) 1878-1928, 1922-06-30
AIRCRAFT THAT HOVERS.
BY Frederic J. Haakin.

Washington. June 30s--The heavier
than air machine that will ascend and
descend vertically. and move forward
when called upon 10 do 30, may not
have arrived. but II IN In the offing
] Henry A. Berliner, n Washington IN
venior has been making demOnstra-
tions with n machine Of this kind that
have attracted widespread attention.
Il IIeiicopter IL tho name given THE
type of flyer. Experts say IL 10 10 be
the next big development in the ny
, ing game and experimenting has been
stimulated BY big money prize that
hss been offered in England for the
, first machine that VIII meet certain
fundamental requirements. Mr., Ber-
liner IN modest about what he has &C
. compilehed and has not gone after the
, prize money as yet but 81 is possible
that he has solved at least ono II the
, big problems presented by the theory
+ Of the helicOpter.
There are three Of these problems--
g.. fret getting The na chine INTO the air;
second flying Il horizontally. and
| third bringing it dowu again. The
= frat has not been ~ difficult II solu-
4, ton and many machines have been
conetructed that will rise from tne
ground vertically. although H. cannot
he said tbst in any one II them thls
phase Of helicopter fight has been
), perfected. Mr.. Berlner's efforts have
been directed largely toward horizon
10 tai flight
p Of course any helicopter that goes
up I'm tho air Will come down The
n great difficulty les in bringing i'
\ down. rather than letting a. fall down.
" and e - said that this e the greatest
k 81 tho three problems mentioned
10 Theoretically the helic0pter caU 9c
stI-a i2ht ~ IN tho ar. fy IN any d.
. rccNon. hover In tho air. and 'her
in come down safely power lfts them
S and uoYes then1 and holds 'hem bu'
IL power is difficult of application In max
in Ing - descer+. The machines have m
wings and when The motor ia CO.. OF
- there ~ marked tendency toward Z
p rock-like fall that spells disaster 7
N there were an engine u ex'rero'
~, nicoty ~ adjustment and ahsolut'
a certaIntv ~ action descent nigh -
40 accomplished by slmplv throttlini
-. down me propeller speed gradually
80 But there ~ m engine ~ s1ch Do
y portability ar yet
H. PropeTers At Cross Purposes.
OF The Rerliner machine which Ia
been constructed primarily :oc *
pc rorlrentation m horizontal figh-. re
X ee7nb'"s an airplane. except tina, 3. IA
re 20 ,v.rgs The fIselage and rudde
ge are the same and ne moor IL n1ounte
M f.~ward as in ne airplane. on eac
ed side - tho <Vsr' 20 3 N upright ca
Of carrying a It-foot propeller, and thes
~ pr pellers whirl in opposite direction
a. forcing me air downv-a rds and g1vir
II the If required % bring ne 80
t. pound machine and pilot straight =
INTO ne air.
80 Avietors point out .ha- getting
= hcucoDter ~ 'ha ground 81 oom0ars
g.. lively an easy matter. Cor ne air n,
-, ~ forced downward fo~rns 2 clsnio
- that helps sustain ne machine. How
- ever. when he machine gets some d.
49,. lance above ne ground there -s :
- such air cushion and, there =
gyroscopic action caused by he bt
l. rotating propellers which frequent
- cause he hei!copter % urn turtl
= Lieut.. Stefan Won Petroczy. % n
Z
RAJ nave assembled 10 feet IN a machine
mis- type. and j. IS claimed hat 2!
Englshman. Louis Brennan, has bee
. UP 20 feet inside a hangar. but II
Ber.!ner mas never taken his heiico'
ter more than 20 or = Feet aOo'
ground. That IS ample for experiment
purposes, he says.
: The Washington inventor n a
. dressing himself 20 the problem q 40
!z5r-a. motion hit upon the plan
IN. fitting the hel.copter. This IS done
means ot d small propeller near q
rid tail Of the machine which IS Eeared
the motor. By lifting the tail slight
his his clts the whole machine whl
results N a forward motion at the e.
.ng peUse ~ The lifting power.
Nj Berlner claims that with a III
oI 1000 pounds only per cent u Z;
per iitt IS lost n \ lit 0f 70 degrees. r.
that his .oss : transferred Into
lily horizontal pull q about IS peg &c
Of the lHting power. The inventor (
lge Geves that IS degree tilt may PC
the s.oy be attained with safety. 5ut
has never gone that TAR N any IF I
experiments. n me course If Va!
70 ne has made short flights over you
ground.
aim Such success as he has met with n
encouraged aim greatly. but he IS
no no means ready 70 20 after the Brit.
prize money. Barely a beginning q
he as Vet been made in this DEPARTING
Of aviation, he says.
War stopped Experiments.
be. From the day Of the first heavi,
than-alr machine the he.icopter b
ais been one OF the visions Of both
men who fly and those who design a
ing bund The ships" They have want
a Kind q aircraft that would not
Quire an immense field 10 take or
: OF fer landing--one that could be Us
from a battleship or passenger YES.
'uld or from me roof Of an Office buildi
Accordingly q deal Of experiment.
uh- IN this direction was going on
nest from the beginning OF await
cIS However. when the European v
opened and the value OF the airpls
As a weapon Of offense and defe,
ZEN was apparent. all experiments "
abandoned save those that had 20
with planes. Inventive genius a
energy We're concentrated on perfe
ing that type of aircraft, with the
suit that moro progress vNas mazda