The Indianapolis times. [volume] (Indianapolis [Ind.]) 1922-1965, 1935-03-30

THE Scripps-H Howard Baby Push
Il er is the next model for be-
ginners to construct in the Junior
Aviator series.
It derives its name from the pro-
peller attached to the rear which
pushes it through the air instead
Of pulling it. as in other models.
Actually the -pusher model flies
backward. for the elevator is in the
lead and the main wing surface is
in the rear.
IN indoor contests. the pusher
model has always proved a popular
type Of plane and many records
have been established by them.
The simple model which we will
describe set a record of three min
utes and five seconds in recent test
flights by Scripps-Howard model en-
gineers.
Lightness is the main thought
which model engineers had in mind
when designing this model For that
reason. q hollow motor stick was
employed.
If you have been building the
models as illustrated and described
in this series. you will have the nee
essary tools. Namely, a razor blade,
ruler. compass and a piece of No. 90
sandpaper.
Tools and Materials
The materials required are:
Five pieces Of 1-16x1 -32x18 inches
balsa wood for the wing spars and
ribs.
One piece Of 1-64x2x18 inches
balSa wood for the hollow motor
stick.
one piece of ssx15-16x7 inches
balSa wood for the propeller block.
one sheet of japanese tissue for
the covering.
one two-dram bottle of cement.
On etwO-dram bottle of tissue ce-
ment or banana oil.
One Pinch piece of ole music
wire for hooks and propeller shaft.
One and one-half feet of .O45
square rubber strand for the motor.
Start Construction
Begin construction of the model
by first forming the hollow motor
stick. The length of the motor stick
is eight inches. Cut the blank as
shown in the C-Sgram and sand
paper a little thinner. Place it in
warm water for a minute or long
enough for it to become soaking
wet. Now bend it around a lie
inch square balSa strip as shown in
diagram and wrap it tightly with
either strips of cloth. gauze or It's
sue paper and place 1t in a medium
warm oven TO dry.
After It has dried. remove the
cloth and forming rod and cement
the top edges together. Cut small
plugs for each end of the stick and
cement them in place. The front
rubber hook. which is the same as
the rear on the Endurance r. o. G..
is bent from No. ole gauge music
wire and cemented in place. Bend
the thrust bearing from the same
gauge music wire and cement it in
place. as shown in diagram.
The wing. which is the next con-
struction step is built from two
Spars. two wing tips and Is wing
ribs. The leading and trailing
edge sparS are duplicates. being made
from 1-16-inch by l-32-inch by ILL., =
inch balSa strips Cut the Is wing
ribs and. using the same process as
described in the construction article
last week. bend then TO the proper
Gambler. You will recall this method
required the use Of a heated to-
baCco can.
Arrange the leading and trailing
edge Spars parallel 10 each other
and the width of a rib apart and
cement each Of the IS ribs in place.
commencing with the two end ribs
and placing alternately a center rio
then an end rib. The center ribs
are placed according TO the dimen-
SionS in the diagram and the others
are set at equal distances apart.
Split the Lilo by l-32-inch balsa
stripping in half for material for the
wing tips.
Give Wing Dihedral
The dihedral angle of this wing is
greater than any model We have
constructed so far, allowing greater
stability in flight Obtain this now
by cutting the leading and trailing
edge SparS half way through with
razor blade at q point opposite the
center. or at the location of he CEN
ter rib. and cracking between the
thumb and forefnger. Place one
side OF the wing fiat on a table and
lift the tip Of the other up until it
is four inches above the table. A
drop Of cement at the Sihedral
crack will hold the wing firmly in