Top Flite TOPA0910 - Manual (Page 32)

Section 5.0:
EMERGENCY ENGINE SHUT OFF
(Kill Switc
h)
5.1
Magneto spar
k ignition engines m
ust ha
ve
a coil-
g
rounding s
witch on the aircr
aft to stop the engine
.
This will also pre
vent accidental star
ting of the
engine
.This s
witch shall be readily a
vailab
le to both
pilot and spotter/helper
.This s
witch is to be oper
ated
man
ually and without the use of the Radio System.
5.2
Engines with batter
y po
w
ered ignition systems
m
ust ha
ve
a s
witch to tur
n off the po
w
er from the
batter
y pac
k to disab
le the engine from fir
ing.
This
will also pre
vent accidental star
ting of the engine
.
This s
w
itch shall be readily a
vailab
le to both pilot
and spotter/helper
.
This s
witch shall be oper
ated
man
ually and without the use of the Radio System.
5.3
There m
ust also be a means to stop the engine from
the tr
ansmitter
.
The most common method is to
completely close the carb
uretor throat using throttle
tr
im.
H
o
w
e
ver
, other methods are acceptab
le
.
This
requirement applies to all glo
w/gas ignition engines
regardless of siz
e
.
Section 6.0:
RADIO REQ
UIREMENTS
6.1
All tr
ansmitters m
ust be FCC type cer
tified.
6.2
FCC
T
echnician or higher-class license required
fo
r 6 meter band oper
ation only
.
ADDITIONAL IMAA GENERAL RECOMMEND
A
TIONS
The f
ollo
wing recommendations are included in the
Saf
ety Code not to police such items
, b
ut r
ather to
off
er basic suggestions f
or enhanced saf
ety
.
It is
e
xpected that IMAA members will a
vail themselv
es of
technological adv
ances as such become a
vailab
le
, to
promote the saf
ety of all aircr
aft and par
ticipants
.
•
Ser
v
os need to be of a r
ating capab
le to handle the
loads that the control surf
aces impose upon the
ser
v
os
.
Standard ser
v
os are not recommended f
o
r
control surf
aces
.
S
er
v
os should be r
ated hea
vy-duty
ounces of torque
.
F
or flight cr
itical control functions
a minim
u
m of 45 inch/ounces of torque should be
considered.
This should be considered a minim
um
for smaller aircr
aft and higher torque ser
v
os are
strongly encour
aged f
or larger aircr
aft.
The use of
one ser
v
o
f
or each aileron and one f
or each
stabiliz
er half is strongly recommended.
Use of dual
ser
v
os is also recommended on larger aircr
aft.
•
On board batter
ies should be
, at a minim
u
m, 1000
mAh up to 20 lbs
., 1200 mAh to 30 lbs
., 1800 mAh
to 40 lbs
., and 2000 mAh o
v
er 40 lbs
.
flying w
e
ight.
The n
umber and siz
e
of ser
v
o
s
, siz
e and loads on
control surf
aces
, and added f
eatures should be
considered as an increase to these minim
ums
.
Batter
ies should be ab
le to sustain po
w
e
r to the
onboard r
adio components f
or a minim
um of one
hour total flying time bef
ore recharging.
•
Dependab
le
, redundant and f
ail saf
e batter
y systems
are recommended.
•
The use of anti-glitch de
vices f
or long leads
is recommended.
•
There is no maxim
um engine displacement limit, as it
is the position of this body that an under po
w
ered
aircr
aft presents a g
reater danger than an o
ver
po
w
ered aircr
aft.
Ho
w
e
ve
r, the selections of engine
siz
e
relativ
e to airfr
ame strength and po
w
er loading
mandates good discretionar
y judgment b
y
the
designer and b
uilder
.
Current AMA maxim
u
ms f
o
r
engine displacement are 6.0 cu.
in.
for tw
o strok
e and
9.6 cu.
in.
for f
our strok
e engines
.
These maxim
ums
apply only to AMA Sanction competition e
vents such
as 511, 512, 515 and 520.
All non competition e
vents
should be sanctioned as Class C e
vents
, in which
these engine siz
e maxim
ums do not apply
.
•
Gener
ally
, it is recommended that no attempt should
be made to fly a r
adio controlled model aircr
aft with
a gasoline engine in which the model aircr
aft w
eight
w
ould e
xceed 12 pounds per cubic inch of engine
displacement (under po
w
ered), or be less than 5
pounds per cubic inch of engine displacement (o
v
e
rp
o
w
ered).
Example:
Using a 3 cu.
in.
engine
, a
model w
ould lik
ely be under po
w
ered at an aircr
aft
w
eight g
reater than 36 pounds
.
W
ith the same
engine
, an aircr
aft w
e
ighing less than 15 pounds
w
ould lik
ely be o
v
er
po
w
e
red.
•
Ser
vo
ar
ms and control hor
ns should be r
ated hea
vy-
duty
.
G
lass filled ser
vo
ar
ms and control hor
ns are
highly recommended.
•
Control surf
ace linkages are listed in order
of pref
erence:
1.
Cab
le system (pull pull).
A tiller bar is highly
recommended along with necessar
y br
acing.
2.
Arro
w-shaft, fiberglass or alumin
um, 1/4" or 5/16"
OD
.
B
racing e
ver
y six (6) to ten (10) inches is
highly recommended.
3.
T
ube in tube (Nyrod).
B
racing e
v
er
y f
e
w inches
is highly recommended.
Inner tube should be
totally enclosed in outer tube
.
4.
Hardw
ood do
w
e
l, 3/8" OD
.
B
racing e
v
er
y six
(6) to ten (10) inches is highly recommended.
•
Hinges should be r
ated hea
vy-duty and man
uf
actured
pr
imar
ily f
o
r use in giant-siz
ed aircr
aft.
Homemade
and or
iginal design hinges are acceptab
le if
deter
mined to be adequate f
o
r the intended use
.
•
Cle
vis (steel, e
xcluding hea
vy-duty ball links) and
attachment hardw
are should be hea
vy-duty 4-40
thread-and-rod type
.2-56 thread siz
e rod is acceptab
le
for some applications (e
.g.
throttle).
Cle
vises m
ust ha
ve
loc
k n
uts and slee
ve
(fuel tubing) or spr
ing k
eepers
.
•
Propeller tips should be painted or colored in a visib
le
and contr
asting manner to increase the visibility of the
propeller tip arc.
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