INTRODUCTION
Congratulations on your purchase of the SIG SBACH XA-41
EP ARF.
We hope you will enjoy this unique fun scale R/C model.
Assembly of your Sbach XA-41 EP ARF is fast and simple
when following the detailed instructions in this manual. We
urge you to read this assembly manual completely before
assembly. Familiarize yourself with the parts and the
assembly sequences. The successful assembly and flying of
this airplane is your responsibility. If you deviate from these
instructions, you may wind-up with problems later on.
Good luck with the Sbach XA-41. Let’s get started!
ADDITIONAL ITEMS YOU WILL NEED TO PURCHASE
In addition to this kit, you will need the following items to
complete your Sbach XA-41 and make it flyable.
❑
RADIO SYSTEM
The Sbach XA-41 requires a standard 4-channel radio system
and four mini size servos. In addition, you'll need two 6" long
Servo Extension Chords (actual length needed will depend on
how long the wires are coming off your servos - be sure to
double check your servos and plan accordingly), and
optionally one standard Y-Harness Chord for connection of the
two aileron servos to the receiver.
ELECTRIC POWER SYSTEM
❑
500-800 watt BRUSHLESS OUTRUNNER MOTOR
The Sbach XA-41is designed to be powered with a 500-800
watt brushless outrunner motor. This size motor is sometimes
referred to as a "32" class motor to those who like to make a
comparison to a glow motor. Also, the motor you choose
should be rated at 800-1000 kv, in order to turn an appropriate
propeller.
Here is a sampling of motor sizes that work well in the Sbach
XA-41:
4 2 5 0 - 8 0 0
4 2 5 0 - 7 7 0
4 2 4 8 - 8 0 0
3 5 5 4 - 8 0 0
❑
MOTOR MOUNT
A laser-cut plywood adjustable motor mount is included in
this kit. It should work perfectly for any suitable brushless
outrunner motor which has an "X" or "cross" motor mount plate
on the back.
❑
60-75 amp ESC (Electronic Speed Control)
We used the Castle Creations EDGE LITE 75 ESC in all our
Sbach XA-41 prototypes. This is an excellent "switching type"
ESC that has a built-in 5 amp BEC that is safe to use with a 4
cell lipo battery pack.
Important Note:
BEC (Battery Eliminator Circuit) allows you
to use the same battery pack to power both your motor and
your radio system, eliminating the normal radio battery pack.
When the single battery pack runs down in flight to a
prescribed point, the BEC circuit in the ESC will shut down the
motor and leave enough power to operate the radio, while you
land the model. Note that the BEC feature in some cheaper
ESCs does not work with 4 cell and larger lipo battery packs -
only 3 cell packs. Check the manual of your particular ESC to
learn if this is true in your case. If your ESC is only rated for 3
cell operation, you have three options: 1) fly only 3 cell lipo
packs (lower power flight performance); or 2) disable the BEC
and install a normal receiver battery pack to run the radio full
time; or 3) install an aftermarket BEC that is rated for 3 or 4
cells.
❑
4 cell 2750-4000 mah LIPO BATTERY PACK
You should fly your Sbach XA-41 with a 4 cell (4S1P) Lipo
pack. Pack capacity should be 2750-4000 mah. The smaller
batteries will give you a lighter airframe that will perform better
in 3D aerobatics while the larger batteries will give longer flight
times. You will have to adjust the position of the battery to
maintain a correct CG balance.
❑
PROPELLER
With electric powered models there are many factors that have
a bearing on what propeller to use. The best place to start
answering that question is in the instructions that come with
What do these numbers mean?
Note:
This numbering system is very common,
however there are exceptions. For instance, some
motor manufacturers will list the actual diameter of the
stator (armature) inside the motor instead of the case
diameter. Some may list the length of the stator inside
the motor instead of the case length. Some will give
you both if you dig far enough into their specs. Make
sure you understand the motor manufacturer’s
numbering system when shopping for a motor.
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