Radio system: Futaba 14SG; Futaba
Flybarless Futaba CGY750 three-axis
Motor: KDE Direct KDE700XF-535-G3
ESC: Castle Creations Phoenix
Edge HV 160 controller
Batteries: Two FlightPower 6S 5,000
mAh LiPo batteries
The RJX Vector 700 3D Speed heli is a fun
All of the
The final assembly is
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RJX Vector 700 3D Speed
Imust admit, this month’s column kind of crept up on me. As I’m writing this, the weather outside is
still unpredictable, cold, and windy. It’s
given me the chance to go through my
fleet and make sure everything is in
good shape for the spring (which will
be here shortly). It’s also a great time
of year to do a little building, and I’d
like to share a build with you that I
completed this winter.
RJX Hobby helicopters have been
around for quite some time. When
people started experimenting with
flybarless rotor heads, it was RJX that
had the conversion kits.
Fast-forward a number of years and
one of the company’s latest creations
is the 700-size Vector 3D Speed. This helicopter is a
unique-looking machine because it doesn’t have any
landing gear. Instead, it balances on its nose, similar to a
tricycle, and it has two short fins that jut out from the
rear of the fuselage.
The full-body fuselage promises plenty of speed, and
the beefy mechanics are designed with speed setups in
mind. This heli can be set up for speed or 3-D flying. I
Its construction is typical of most helicopter builds.
The quality of the parts appears to be good, and it has all
bearings in all the right places. The drivetrain uses a belt-and-pulley system, which first reminded me of the SAB
Goblin helicopters—the motor drives a main pulley via a
heavy-duty belt that in turn drives the tail and main gear.
The motor tension is taken up using a bolt that pulls the
motor tray away from the belt pulley.
A unique feature on this helicopter that I haven’t seen
before is an antirotation bracket. It is a pivoted arm that
travels straight up and down, and is physically bolted
directly to the swashplate and upper main bearing plate.
It seems to work great and the only drawback is slightly
109 Model Aviation JUNE 2015 www.ModelAviation.com