Use all servo tie-down locations. The author used
some double-sided tape to secure them further.
Beefy tail gear and a solid control mechanism
ensure a worry-free tail assembly.
important for a correct main shaft fit, so
follow the manual closely to avoid having
to take things back apart.
The head comes preassembled, but
should be taken apart and checked
for proper assembly. My heli’s head
was assembled correctly. The thrust
bearings were in the correct position and
lubricated, and all other components
were placed properly. It was simply a
matter of cleaning all of the screws with
Use a cotton swab to clean the threads
inside of the feathering spindle to ensure
proper threadlocker adhesion. The new
Align head is no longer direct flight
control (DFC), and this is a fantastic
change. I expect the Align T-Rex 700X
Dominator to have a better feel than the
previous DFC-equipped helicopters that
I have flown.
Align has continued with its tradition
of using a torque tube for the tail-drive
system. You will find many opinions for
using a torque tube instead of a belt,
but this is a smooth torque-tube-drive
system. Align has provided two torque-tube bearings to ensure a smooth and
vibration-free tail system.
The bearing carriers fit well. After
placing them on the drive shaft, a small
amount of thin CA glue locked them in
place. To insert the drive shaft into the
boom, I used a little dish detergent to
lubricate the bearing carriers. I put the
detergent on a cotton swab and applied a
thin film along the first inch or two inside
of the boom. As I began to insert the
drive shaft, I used an Align insertion tool
to finish placing the drive shaft inside of
After assembling the drive shaft, it
is time to move on to the full tail box
assembly. The 700X tail control assembly
is well designed and provides smooth
and worry-free operation. I checked
the tail grip assembly and found that all
items were correctly placed, and proper
lubrication had already been applied to
the tail thrust bearing assembly. I simply
had to check and apply threadlocker and
The tail gear assembly was also correct,
and no additional work was necessary.
The tail gears were smooth and I found
no physical imperfections during
operation. After I had attached the tail
control assembly onto the boom, it was
time to insert the boom into the frames.
When inserting the tail into the frames,
push until you feel the boom fully seat
itself in the frames. When in place,
equally tighten all frame screws. Make
sure to place the “safety” screw that is
meant to keep the boom from sliding out
of the frames.
The 700X’s main gear is thick and
beefy. The gear was well made and
smooth. My gear was preassembled and
all screws had threadlocker on them.
When inserting the main shaft into the
gear assembly, don’t overtighten the
screw that holds the shaft in place—
doing so might create warp. The screws
need to be snug, but don’t use gorillalike
force to torque them down. After you
have inserted the gear and tightened the
screws, run the head by hand and check
The included Align motor is massive.
The 850MX is a 490 Kv motor, and Align
claims that it will handle anything you
throw at it. One nice addition to this
kit is a motor-mounting plate. Align has
manufactured a motor plate that also
acts as a nice heat-sink mount. It should
improve motor cooling and longevity.
After attaching the motor to the
mounting plate, connect the pinion. The
pinion is perfectly mated to the motor’s
Kv and the expected performance of
the helicopter. There are other pinions
available for tuning, but I think this
pinion will work perfectly for most
The next item of assembly is to mount
the motor to the frames. There are four
screws—you want to evenly tighten them
to ensure smooth operation. My pinion/
gear mesh was spot on, and the drive
system needed no additional work.
Electronics and Setup
Align has included an impressive set of
electronics with the 700X Super Combo.
The cyclic and tail servos have impressive
statistics and are sure to perform anything
you ask. Align has also included a very
capable BeastX MicroBeast Plus flybarless
control unit in the kit. Many people like
them because they require no external
device to complete programming.
Setting up the MicroBeast Plus
is straightforward if you follow the
programming guide. Individual tuning
can be accomplished by changing some
parameters in your transmitter and/or
additional tuning of the MicroBeast Plus.
Finally, let’s discuss the Align 130-amp
ESC. Align partners with companies
that can manufacture high-quality
products that meet its specifications.
This new 130-amp ESC is impressive.
It offers a nice programmable slow
start, active freewheeling circuitry, an
available external programming box,
long connection cables, an rpm sensor,
etc. If you want it, this new ESC has it.
On top of the performances that this
ESC offers, it is a spectacular piece of eye
79 Model Aviation DECEMBER 2016 www.ModelAviation.com