Great Planes CG Machine - GPMR2400 - Manual

Undoubtedly
, y
ou ha
v
e
an air
plane on which y
ou are anxious to test
y
our C
.G.
Machine
, so let’
s get star
ted!
T
OOLS AND SUPPLIES REQ
UIRED FOR ASSEMBL
Y
:
Thic
k or medium CA
Hob
b
y
knif
e
Phillips scre
wdr
iv
er
Small metal file Thread loc
king compound
600 & 220-g
rit sandpaper
Small 90° tr
iangle
Tissue or paper to
w
e
l
Rub
bing alcohol or glass cleaner
C.G.
MA
CHINE P
A
R
T
S
❏
1.
Examine all molded plastic par
ts
, and tr
im off an
y mold flashing
with a shar
p hob
b
y
knif
e
.
Examine the ends of the metal rods f
o
r
b
urrs
, and carefully remo
v
e
them with a metal file or emer
y cloth.
ASSEMBL
Y SEQ
UENCE
❏
2.
Inser
t the tw
o 3/16" x 12" steel
base joiner r
ods
into the holes
in one of the molded plastic
bases
.
Both of the bases are the same
so there is not a
right
or a
left
.
The joiner rods should fit sn
ug, b
ut if
the
y are too tight, lightly lubr
icate them with bar soap
.
If the rods are
still too tight, carefully enlarge the holes in the base with a 3/16" dr
ill
bit or a round file
.
❏
3.
Join the other base to the joiner rods the same w
a
y.
❏
4.
Thread the tw
o 2-56 threaded steel
piv
ot balls
into the ends of
the 1/4" steel
upright r
ods
with a drop of thread loc
king compound.
Carefully remo
v
e
an
y b
urrs on the piv
ot balls with a small file
.
Clean
the piv
ot balls with a tissue
.
❏
5.
Push the 1/4" steel upr
ight rods
all the wa
y
into the bases
.
If
there is m
uch resistance
, carefully enlarge the holes with a 1/4" dr
ill
bit or a round file
.
❏
6.
The plastic r
uler set consists of tw
o
ruler
s
, connected
b
y
three
tabs
.
Use a hob
b
y
knif
e to cut par
t-w
a
y
through each tab on
both
sides
of the r
ulers
, then carefully fle
x and snap the r
ulers apar
t.
T
rim
the remaining tabs flush with the edge of the r
ulers
,
then finish with a
flat sanding b
loc
k and 220-g
rit or finer sandpaper
.
❏
7.
Inser
t the .074" x 2-1/2" wire
pointer
s
into the plastic
ruler end
caps
.
This should be a secure fr
iction fit.
❏
8.
Slide the r
uler end caps onto the r
ulers
.W
hen the r
uler end caps
are fully seated, the pointers should be per
pendicular to the r
u
ler – y
o
u
can use a small 90° tr
iangle to chec
k.
If it is necessar
y to adjust the
fit, sand the end of the r
uler slightly or tr
im the slot in the r
u
ler end cap
.
❏
9.
Apply a drop of thic
k or medium CA to both sides of the r
uler
at
the “z
er
o”
end,
inser
t the r
uler fully into the slot in the end cap
, then
immediately confir
m that the pointer wire is v
e
rtical.
Attach a r
uler end
cap to each of the r
ulers
.
❏
10.
Chec
k the fit of the r
ulers in the molded plastic
ruler holder
s
.
The r
ulers should slide freely in the r
uler holders
.
If the
y do not,
carefully sand the edges of the r
ulers with a sanding b
loc
k and fine
sandpaper until the r
ulers slide freely
.
❏
11.
Loosely attach the r
uler holder to the molded plastic
soc
ket cap
with a #4 x 3/8" scre
w
.
❏
12.
Inser
t the r
uler through the r
uler holder
, then tighten the scre
w
only enough to pro
vide fr
iction.
Do not o
v
er
tighten the scre
w
, as this
ma
y def
or
m the plastic.
❏
13.
Clean the top of the soc
k
et caps with a tissue or paper to
w
e
l
dampened with r
u
b
bing alcohol or glass cleaner
.
P
eel off the bac
king
from the f
oam r
u
b
ber
pads
, then apply the pads to the tops of the
soc
k
et caps
.
❏
14.
Snap the soc
k
et caps onto the steel balls on the upr
ight rods
.
There is not a front or a rear to the C
.G.
Machine so at this time it does
not matter onto which upr
ight rod y
ou install the soc
k
et caps
.
❏
15.
Piv
ot the soc
k
et caps throughout their r
ange of motion to chec
k
for free mo
v
ement.
If there is a significant amount of fr
iction betw
een
the cap and the ball, remo
v
e
the cap and snap it on again, mo
ving
and spinning it around.
If there is still too m
uch fr
iction, polish the steel
ball with 600-g
rit sandpaper and coat it with a thin film of bar soap
.
❏
16.
Apply the peel-and-stic
k decal to the top edge of one of
the bases
.
C.G.
MA
CHINE
™
ASSEMBL
Y INSTR
UCTIONS
Thank y
ou f
or purchasing the Great Planes
®
C.G.
Mac
hine
.
W
e are
glad y
ou realiz
e the impor
tance of proper
ly balancing y
our model
and the eff
ects the C
.G.
location has on the w
a
y it flies
.
Although
chec
king the C
.G.
is often one of those last min
ute
“oh, I’
d better do
that bef
ore I get to the flying field”
procedures
, the C
.G.
location can
ha
v
e
a prof
ound eff
ect on the w
a
y all models handle and respond to
control inputs
.Theref
ore
, deter
mining and shifting y
our model’
s
C
.G.
is an oper
ation that y
ou should perf
or
m with care and accur
acy
.
That’
s
where the Great Planes C
.G.
Machine comes into pla
y.
With
the Great Planes C
.G.
Machine
, y
ou can accur
ately and easily
balance y
our model according to the man
uf
acturer’
s
recommendations
,
and then mak
e incremental changes to the C
.G.
location to alter y
our
model’
s flight char
acter
istics according to y
our flight skills
and pref
erences
.
Great Planes Model Man
ufacturing
P
.O
.
Bo
x 788
Urbana, Illinois 61801
(217) 398-8970
Entire Contents © Cop
yr
ight 2004
BALP01 v1.1
Not designed f
o
r
use with planes
under 2 lbs
fl
ying weight.