INTRODUCTION
Congratulations on your purchase of the SIG RASCAL 72 EG
ARF kit. The legend of the RASCAL began with a small rubber-
powered free-flight model in the 1950s. Adapted for modern radio
control, the RASCAL's classic good looks and dream-come-true
flying characteristics have made it the favorite everyday airplane
of thousands of R/C pilots.
SIG offers the RASCAL design in several sizes. This 72 inch
wingspan version gives you the option of using either glow or
electric power. Whichever power system you choose, you’ll find
that this RASCAL flies as good as it looks. Streamlining and a
high performance airfoil allow the RASCAL to do aerobatic ma-
neuvers better than most typical high wing designs. This will very
likely become your favorite everyday R/C airplane!
Assembly of the RASCAL 72 EG ARF is fast and simple when
following the detailed instructions in this manual. A low parts
count and professional engineering ensure quick and easy as-
sembly. All parts are CAD-drawn, laser-cut, and jig assembled,
which means that everything fits the way it should!
We urge you to read this assembly manual completely before as-
sembly. Familiarize yourself with the parts and the assembly se-
quences. 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 RASCAL. 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 RASCAL 72 EG ARF and make it flyable.
❑
RADIO SYSTEM
The RASCAL 72 EG requires a standard 4-channel radio system
and five standard size servos. In addition, you'll need two 12"-
24” long Servo Extension Chords (actual length needed will de-
pend on how long the wires are coming off your servos - plan
accordingly), and one Y-Harness Chord for connection of the two
aileron servos to the receiver.
POWER SYSTEM - GLOW OR ELECTRIC?
The biggest decision you will have to make is whether to power
your RASCAL 72 with a glow engine (2-stroke or 4-stroke) or an
electric motor. We have flown the RASCAL 72 on a variety of both
types of power systems, and we make the following recommen-
dations based on our successful on-field experience.
GLOW POWER RECOMMENDATIONS
❑
ENGINE
We recommend the following size for the RASCAL 72.
2-STROKE - .40 to .46 cu. in.
4-STROKE - .40 to .54 cu. in.
Whatever brand engine you choose, take the time to carefully
break it in according to the manufacturer's instructions. A good
running, reliable engine is a minimum requirement for the enjoy-
ment of this or any R/C model aircraft.
❑
PROPELLER FOR GLOW
Refer to the engine manufacturer’s instructions for recommenda-
tions on proper propeller size for their engine. In our experience,
most 2-stroke .40-.46 glow engines will fly the RASCAL 72 very
nicely with a 10x6 or 11-6 prop.
ELECTRIC POWER RECOMMENDATIONS
❑
500 - 800 watt BRUSHLESS OUTRUNNER MOTOR
There are many fine 500 to 800 watt electric outrunner motors on
the market that will fly the RASCAL 72. We use the Maxx Prod-
ucts Himaxx HC3528-1000 Brushless Outrunner Motor.
Specs: case diameter: 35mm
case length: 54mm
stator diameter: 28mm
magnet length: 28mm
weight: 197g (6.9 oz.)
Kv = 1000
Rm = .020
Lo = 2.6
❑
MOTOR MOUNT
We use the Maxx Products #ACC3958 Large Motor Mount. This
plastic cone-shaped mount provides the exact firewall-to-propeller
distance needed to fit inside the RASCAL 72 cowling, without
modifications. If you go shopping for another brand mount, you
will need a mount that can provide 4-1/2" from the front of the fire-
wall to the back of the propeller (or spinner if being used).
❑
50-60 amp ESC (Electronic Speed Control)
We use the Castle Creations ICE 50 ESC or the Castle Creations
Phoenix 60 ESC. We typically see amp draw of 30 to 48 amps,
depending on whether a 3 cell or 4 cell lipo is being used, and the
propeller size.
NOTE: The Castle Creations ESCs that we used, as well as the
many of the other ESCs on the market, have a BEC (Battery Elim-
inator Circuit) built in. BEC allows you to use the same battery
pack to power both your motor and your radio system, eliminating
the normal radio battery pack. As the dual purpose battery runs
down in flight, the BEC circuit in the ESC will shut down the motor
and leave enough power to operate the radio while you land the
model. However, the BEC feature in many ESCs does not work
with 4 cell 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 op-
tions: 1) fly only 3 cell lipo packs; 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. We wanted to be
able to fly both 3 cell and 4 cell packs interchangeably, so we
chose option #2; using a normal receiver battery pack. The little
bit of extra weight is no problem for the RASCAL 72. We then dis-
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