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8/11/2019 Bulldog. Hlg. Article&Plan. Model Builder September 1980 (1)
1/3
/,,-
1116"
t16"
HARDWOOD
TRtp
WING
=
SOFT
BALSA 114'x
4-117'
x 2O"
STABfLfzER= SOFTBALSA 1116'l l 'x9"
/
RUDDER=
/\
/
soFr
BALSA
\
-/
,l''",'-')'-
/ l ' t I t l
. / t l
=r--.=
*----
SUB-RUDDER=
.
SOFT
/16"BALSA
POLYHEDRAL ETAIL
FUSELAGE
HARD
BA SA
/4'x2-114'x22"
l-o*oWt* nott
THE
BULLDOG"
8/11/2019 Bulldog. Hlg. Article&Plan. Model Builder September 1980 (1)
2/3
:BULLDOG:
Bv
WILLIAM
LANGENBERG
. . An
all-out
competition
HLG, alcit
larger
han
m.ost,
or experienced
6,iir.i;r*r"J'rt-il;;r. tt's he 23rd(andbest) n a series f HLG'sdesignedv theauthor.
.
In
recent
years
he
Popular
model
masazines
ave featured
a
substant ia l
nui.rber
of so-called
beginners"
pro-
iects.
efore
roceedingu ther
w th h s
;r t icle,
feel t should
e
made
lear hat
BULLDOC
does
not
fit into
this
cate-
eorv.
On the
conlrdrY
BULLDOC
s a
Eand-launched
l ider
designed
or the
exoerienced modeler with a better-
than-average
hrowing
arm.
Ihis model is the
lwenlv-third
n a
series
f
or ig inal
and-launched
l iders
which
have
bui l tover
he
past
ecade.
It waschristened
BULLDOC
because
ts
abilities
o
stay
ogether
on the
most
powerful
launih
and
to soar
on
the
i l iehtesthermal
ef lecled
he enacious
qualities
of
its
namesake.
BULLDOC's
predecessorsan he
Samul
n respecl o
5i7e,
proport ions,
weiShl ' and
lorce
arrangemenls.
hrough he
experience
eaine-d rom
these
models,
he
basic
design
n
these
pages
radually volved.
BtiLLDoc
is somewhat
arger
than
the average
outdoor
hand-launched
slider,
yel"
t
is not
so bully
that
th e
"modeler
with a
good
throwing
arm
cannotdchieve
mpressive
eight n
the
launch.
n addi t ion,
he
relat ively
arge
sizeand
low wing
loading
enable
his
model o
floaton
uocu
rents
o
which
ts
smal ler
competi tors
do
not
normal ly
resoond.And orobablymost mportant'
the
arge
ize
bnds
o keep
he
model
n
sieht
6nger
after
t catches
lhermal.
- the
fuselag"
prot i le of
BULLDoc
orovides
a
relatively
arge,
ow
trontal
area.This
ends
to
lower
the
center
of
gravitv
and
makes
he
rudder
area
es s
:ri t ic;1.
A
oolvhedral,
undercambered
wine
with
fair lv
shal low
polyhedraI
aneEs
s used
n
coniunct ion
wi lh th is
fusilaee design. Such a combination
orovid-es
excillent
lateral
and
longi-
iudinal
stabi l i tv.
BULLDOC
s a
stable
flier
n both
caim
and
windy
conditions,
with
nei ther
the
lateral
rocking
nor
susceptibility
o spins
prevalent
n many
hand-launched
l iders.
So
much
for ihe
history
and
design
theorv behind
this
model
l believe
t is
suff icient
o
say
hatwhen
properly
ui l t
and
f lown,
EULLDOC
wil l
Present
a
threat at
anY
contest.
CONSTRUCTION
These
nstructions
will be
brief
since
the
reader sassumedo be amiliarwith
hand-launched
l iders.n
general , . t ry
o
use
lhe desiSnaled
Erades.ol
balsa
n
order
o keep
down
the
wergnt
bear
n
mind that
hi
oerformance
f
the
glider
will be
in direct
proportion o
the care
used
n
its construction.
RUDDER
AND
STABILIZER
Select
some
5-6
lb. semi-quarter
srained 1/16 sheet balsa or the tail
iurfaces. Cut
them
to
their
required
out l ines.
The rudder
is sanded
to a
streamline
shape.
Sand
the stabilizer
into the
airfoii
section
shown
on
th e
Continued
on
Page
96
8/11/2019 Bulldog. Hlg. Article&Plan. Model Builder September 1980 (1)
3/3
ftaa ${nTs
ME AND
MY RC
't
coLoR
rxclusrvE
rGHrs
FnoM
noYAL
CFOWN O A|
Your
choice
PLAIE
BOA' caF on poly
ester/ cotlon T-shin
Af A VINGS
AtrAwlnet
,"."r.4""c,o9f
1
^,^,
6.
SO
Si:. S, M, L, XL + soa
Pollror
Wa do cuslom wotk for
cluba.
lFitl .vant , businclroa
Intonndion
3anl
on
raquagl.
fta
a sHnTs
1132 fl,
RtY
.
t^t
vtcAs,
NtvAoA
(,02187 1624
8'|OI
blockaresimulatedwith black nk,asare
the
control surface
outlines.
The ail skid
smadeout
of two
pieces
ol basswood.
Fil l in the bottom
of the
fuselaqeat the aft end
between
the
lower' iongerons
ith a small
r iangleof
balsa
o support he
tail skid,
The nsignia
oes
n thelopofthetop
wings, n
the bottomof
the ower
wings,
and-onboth sides
of the
rudder,
n
the
locations hown.As ar as can ell here
were
no
other
markings on the
real
airDlane.
Thermals orever Even
ndoors.
.
Butfdog
. , , ,
Continued
from
page
59
pran.
WING
The wing is the
main elementof
the
CUSIO,,
TUNEO
ENC//[ES
CON'fTfircN
ACCESSOA'ES
Cor, OS l.t,
noatt a
Sttr..
fte..
EDttna.
soacLlrt,.
ln
clt,om
f.o- oat/oal
at.t
...at .nola...
fh.o,,t.cl f.o.'t ara{.D|..
Comctaaa
6ianao.,
ol
t,oca a cu.,otr
D.taa.
tl.td-,o.gaa Lama asct .. clt o6 na..tt
r.lrat,
,aclnt .h..1.,
QU|t
lt
a,
ttt.,
.ttsl.olat,
a
6.., o,t...,
Er..tattlre lo. e/C t co.a.ot
,lrt.
..ctre
,teo.Ar
AAA , t t .e.cl.r:
ooo.tr... .Ora X aO' ..,t.t
ltn.. t2 aC
Pttt.
Fo. .t.a.tl.d b.ocrt
r., ..n.t 25
c.aa, ,c:
t.a,on X.at,.at...lrlD aot
2cat L.?tra
tl a
c. t l . t2a5t
' ] t :
(7|a)
a'o-sraz
model and reouires he most etfort to
build. Start
work by choosinga
sheetof
5-6 lb. semi-quarter
grain
balsa
1/4 x
4-1/2
x 20 nches ong. Cut the
wint to
the
proper
outl ine
and then
glue
the
1/16 x 3/16 spruce
strip to the
leading
edge.
When this
is
dry,
taper he
wing
blank from a 1/4-inch hickness i
the
center to 1,/16
nch at each tip.
Nexl,
sand
he
proper
undercamber
nto the
lower surface. hen carveand sand he
wing into the linal desired
irloilshape.
Finally,cement
in the required
poly-
hedral angles sshown
on the
plan.
fUSELAGE
Usea oiece
oI 15 b.6alsa'l/4
x2-1/4\
22 inches
ong for the
fuselage.
Carve
and sand
it to shape using the cross-
sections
hown on
the
Dlan.
f desired,
the
Iuselagemaybe built up using
3/16
x 3/4 inch piece of spruce or the tail
boom splicedor
laminated
nto
a
for-
ward section
of balsa.
ASSEMBTY
Clue the stabil izer
n
place,
olloweo
by
the rudder and
sub-rudder.When
thesearedry atiach
he wing,ensurinta
good
fit
between
uselage nd under-
cambered
section.
nstall he throwing
patch
and
checkalignment
hrouthout.
Double coat all glue joints for added
strength.
BUlLDoc should balance
t the C.C
point
on the
plan.
I have ong
favored
permanent
ballastover
modeling clay,
sincebalancing laycan
produce
up to
three
imes he coefficient f drag
as he
norma fuselage cross-5ection.
Per-
manentballast
; the orm of
lead
canoe
inserted n the
noseand smoothed ver
with
glue
or
plastic
wood, thus
per-
mitting
a smooth
uselage ontour o be
maintained.
fINISHING
Two coats of thin nitrate dope should
be
sulficient for the empennage
and
fuselage. recommend the following
procedure
for the wing. Rub talcum
powder
into the
pores
of
the wood and
wipe off any excess. Seal the powder
with
one
coatofthin
nitratedope.Then
sand the
wing smooth. Complete
the
linishing
process
y applying
wo
more
coatsof
nitratedope and hen
polishing
the winr
with
automobile
wax. Be
sure
to
add v-our
AMA license umber o tne
upper
ight
wing
as
shown n the
photo-
traPns.
TlYING
BULLDOC should
weigh about
1. 2
oz. complete.
Before attemptint test
fl ights, remove any
warps which may
have appeared
n the flying surfaces.
Then adiust model for lelt circles of
about
ifiy feet in diameter.
Because f
its size and
polyhedral
arrangement,
BULLDOC ansa{elv
andlea consider-
able
amount of rudder.
or best esults,
the slider should be launchedat a 45o
angle to the
r i tht. When
pro pe
y
adiusted and thrown. it should
make
about
three-ouarters f a turn
to the
right before
eveling
ff
into
a
eft
glide.
Alter directionof launchuntilthe
model
pul ls
out on top,
headingnto he
wind.
Practice aunchins he BULLDOG ntil
you
are
confideni the
model wil l
pull
out
into
the
wind under
varyingweather
conditions.
Under
present
ontest onditions,
he
hand-launched
lider
event
inevitably
involvesan
element of luck.
I firmly
believe,however, hat
you
can become
more consistently
ucky
by developing
vour abi l i tv
to f ind and
launch into
ihermals. n this
regard,do not hesitate
to
piggyback
otf a competitor circling
overhead in a thermal. You can be
certainyour competitorswill piggyback
off
you
if they can
Workbench.
,
Continued
from
page
6
traded that two-wheeler
n
for
a
four-
wheeler.
INDUSTRY
NEWS
Just
eceived
word from
Joe
Bridithat
Bridi Hobby Enterprises
as
purchased
Pro Line
Electronics,nc., lock, stock,