45
4)
I will oper
ate m
y
model using only r
adio control
frequencies currently allo
w
e
d b
y
the F
eder
al
Comm
unications Commission.
5)
I will not kno
wingl
y operate m
y
model within
three miles of an
y pre-e
x
isting fl
ying
site
e
x
cept in accor
dance with the frequenc
y
sharing a
g
reement listed
[in the complete AMA
Saf
ety Code].
9)
Under no circumstances ma
y a pilot or other
person touch a po
w
e
red model in fl
ight;
nor should
an
y par
t of the model other than the landing
g
e
ar
, intentionall
y
touc
h the gr
ound,
e
x
cept
while landing.
CHECK LIST
Dur
ing the last f
e
w moments of prepar
ation
y
o
ur mind ma
y be else
where anticipating the
e
x
citement of the fi
rst fl
ight.
Because of this
, y
ou
ma
y be more lik
ely to o
v
er
look cer
tain chec
ks and
procedures that should be perf
o
rmed bef
ore the
model is fl
o
w
n.
T
o
help a
v
oid this
, a chec
k list is
pro
v
ided to mak
e sure these impor
tant areas are
not o
v
er
look
ed.
Man
y
are co
v
e
red in the instr
uction
man
ual, so where appropr
iate
, ref
e
r to the man
ual
fo
r complete instr
uctions
. Be sure to chec
k the
items off as the
y
are completed.
❏
1.
Mak
e sure y
ou ha
v
e
chec
k
e
d the C
.G.
according
to the measurements and procedures pro
v
ided.
❏
2.
Balance y
our model
later
a
lly
as e
xplained.
❏
3.
Be cer
tain the batter
y
and receiv
e
r are securely
mounted.
Simply stuffi
ng them into place with
fo
am r
u
b
ber is not suffi
cient.
❏
4.
Extend the receiv
e
r antenna all the w
a
y do
wn
the antenna tube in the fuselage
.
❏
5.
Use threadloc
king compound to secure cr
itical
fa
steners such as the set scre
ws on the retr
actab
le
landing gear str
u
ts and axles or wheel collars
,
scre
w
-loc
k
pushrod connectors
, etc.
❏
6.
Be cer
tain the scre
ws holding the hor
iz
ontal
stabiliz
er and the v
e
rtical stabiliz
ers ha
v
e
been securely tightened with threadloc
k
e
r on
the threads
.
❏
7.
Add a drop of oil to the axles so the wheels will
tur
n
freely
.
❏
8.
Mak
e sure all hinges are
securel
y
glued in place
.
❏
9.
Reinf
orce holes f
o
r w
ood scre
ws with thin CA
where appropr
iate (ser
v
o
mounting scre
w
s
,
canop
y mounting scre
w
s
, etc.).
❏
10.
Confi
r
m
that all controls oper
ate in the correct
direction and the thro
ws are set up according
to the man
ual.
❏
11.
Mak
e sure there are silicone retainers on all
the cle
v
ises
.
❏
12.
Mak
e sure all ser
v
o
ar
ms are secured to the
ser
v
os with the scre
ws that came with them.
❏
13.
Where appropr
iate
, secure connections betw
een
ser
vo
wires and
Y
-connectors or ser
vo
e
x
tensions
,
and the connection betw
een y
our batter
y
pac
k
and the on/off s
w
itch with vin
y
l tape
, heat shr
ink
tubing or special clips suitab
le f
o
r that pur
pose
.
❏
14.
Mak
e sure an
y ser
v
o
e
x
tension wires y
ou ma
y
ha
v
e
used do not interf
ere with other systems
(ser
v
o
ar
ms
, pushrods
, cab
les
, etc.).
❏
15.
Mak
e sure the fuel lines are connected and are
not kink
ed.
❏
16.
Balance the propellers (and spare propellers).
❏
17.
Securely tighten the propeller hubs
. Be cer
tain
to use threadloc
k
e
r on the threads
.
❏
18.
Place y
our name
, address
, AMA n
umber and
telephone n
umber on or inside y
our model.
❏
19.
Cycle y
our receiv
e
r batter
y
pac
k (if necessar
y)
and mak
e sure it is fully charged.
❏
20.
If y
ou wish to photog
ra
ph y
our model, do so
bef
ore y
our fi
rst fl
ight.
❏
21.
Range chec
k y
our r
adio when y
ou get to the
fl ying
fi eld.
FL
YING
The
T
op Flite B-25J Mitchell ARF is a g
reat-fl
ying
model
that fl
ies smoothly and predictab
ly
. The B-25 does not,
ho
w
e
v
e
r,
possess the self-reco
v
e
ry
char
acter
istics
of a pr
imar
y R/C tr
ainer and should be fl
o
w
n only b
y
e
x
per
ienced R/C pilots
.
MOUNT THE
WINGS
Assuming the outer panels and tail ha
v
e
been
mounted to the model at the w
o
rk
shop and y
ou’v
e
tr
anspor
ted it in this confi
gur
ation, connect the aileron
and fl
ap ser
v
o wires and mount the outboard panels
to the inboard panels
.
FUEL MIXTURE ADJUSTMENTS
A fully co
wled engine ma
y r
un at a higher temper
ature
than an un-co
wled engine
. F
o
r this reason, the fuel
mixture should be r
ichened slightly so the engine
ru
ns at about 200 r
pm belo
w
peak speed.
By r
u
nning
the engine slightly r
ich, y
ou will help pre
v
ent dead-
stic
k landings caused b
y
o
v
erheating.
CA
UTION
(THIS APPLIES
T
O
ALL R/C
AIRPLANES):
If
, while fl
ying, y
ou notice an
alar
ming or un
usual sound such as a lo
w-pitched
“b
uzz,
” this ma
y indicate control surf
ace
fl utter
.
Flutter occurs when a control surf
ace (such as an
aileron or ele
v
ator) or a fl
ying surf
ace (such as a
wing or stab) r
a
pidly vibr
ates up and do
wn (thus
causing the noise).
In e
x
treme cases
, if not detected
immediately
, fl
utter can actually cause the control
surf
ace to detach or the fl
ying surf
ace to f
a
il, thus
causing loss of control f
o
llo
w
e
d b
y
an impending
cr
ash.
The best thing to do when fl
utter is detected
is to slo
w
the model
immediatel
y
b
y
reducing
po
w
e
r,
then land as soon as saf
ely possib
le
. Identify
which surf
ace fl
uttered (so the prob
lem ma
y be
resolv
ed) b
y
chec
king all the ser
v
o
g
rommets f
o
r
deter
ior
a
tion or signs of vibr
ation.
Mak
e cer
tain all
pushrod linkages are secure and free of pla
y.
If it
fl
uttered once
, under similar circumstances it will
probab
ly fl
utter again unless the prob
lem is fi
xe
d
.
Some things which can cause fl
utter
are;
Excessiv
e
hinge gap;
Not mounting control hor
ns solidly;
P
o
or
fi
t of cle
v
is pin in hor
n;
Side-pla
y
of wire pushrods
caused b
y
large bends;
Excessiv
e
free pla
y
in
ser
v
o
gears;
Insecure ser
v
o
mounting;
and one of
the most pre
v
alent causes of fl
utter
;
fl
ying an o
v
er-
po
w
e
red model at e
xcessiv
e
speeds
.
