The Robin S has plenty of room for batteries, including the AGA Power 6S 5,200 mAh
LiPo, and ample space in which to move the battery around to achieve the proper CG
without adding additional weight.
Construction: Robin S 50E
The Robin S arrived nicely packed with bagged parts
secured to prevent shipping damage. The hardware appears to
be of excellent quality and comprises several bags, each labeled
according to the assembly area it’s destined for.
The instructions are mostly photo illustrations with a few
pages of printed specifications and control throws. The 190
photographic steps appear more daunting than they really are.
This airplane isn’t a trainer and anyone with a few ARF builds
under his or her belt shouldn’t have a problem.
Other than the hatch, cowl, and wheel pants, the model
is completely built-up using laser-cut balsa and plywood.
The Oracover base and trim were expertly applied and there
were no wrinkles, sags, or loose edges, earning an A+ for the
The fiberglass cowl and wheel pants are painted to match
and appear to be lightweight, but sturdy. A molded cabin tray
that attaches to the hatch includes the windows. The cockpit
detail is good, but no pilot figures are included.
The Robin S was assembled using Zap brand thin and
medium CA glue, Z-Poxy 15- and 30-minute epoxy, RC- 56
canopy glue, and Z- 42 blue threadlocker. These products are
available from Frank Tiano Enterprises.
Taildragger RC provided the heavy-duty 20-gauge twisted
servo extensions. The front end will be getting a new Hacker
A50-16S V3 motor. The V3 is lighter and more powerful than
previous editions, and the product is once again available in
the US from Hacker Motor USA.
Turning the V3 will be a Hacker X- 70 SB 70-amp speed
controller spinning a Xoar 16 x 8 wood propeller. Former
Model Aviation Soaring columnist and electric expert, Lee
Estingoy, is handling the Hacker distribution in the US, so
the Hacker line should be in good hands. AGA Power USA
provided a 6S 5,200 mAh 35C LiPo battery for the review.
The elevator, rudder, and ailerons are hinged using CA
hinges and thin Zap. The instructions show using kicker on
the hinges, but I prefer to allow the CA adhesive to wick
completely and cure by itself. The flaps are hinged using point-style hinges that were installed using 30-minute Z-Poxy.
The manual recommends JR servos, so using Hitec servos
required some minor trimming. I used RTL Fasteners hex-head
servo screws to mount the servos. In each case, the screw was
fitted and removed and the threads hardened with thin CA
before installing the servos.
Aside from the rudder, all of the controls use a direct servo
connection. All of the hardware is ball-link style for a slop-free
control system installation. The rudder uses a pull-pull cable
and the hardware is of excellent quality.
Building a lot of models means I have a few custom-fabricated tools. One was made by grinding the sharp edges
away from an old pair of dinged-up wire cutters. This makes
crimping a snap. If you botch any brass crimps or ever need
spares, they can be purchased in bulk from any well-stocked
The G- 10 fiberglass control horns round out the control
installation. After trimming them to the required shape and
scuffing the gluing surfaces, I installed them with
The landing gear installation is straightforward.
SebArt RC supplied what appears to be black
neoprene tubing that is split on one side with a
hobby knife to create a combing. The result is a
flexible gasket between the wheel pant and the wing
that looks very realistic.
The Robin S includes a lighting system with
impressively bright landing lights. Much of the
wiring is in place, but some final connections have
to be made. The landing lights were secured in place
and the covers were installed using canopy glue.
The LED lights need to be trimmed to fit and the
final connections made. Test the lights before heat
shrinking the wires and gluing in the lights because
they only work when connected one way! The navigation
lights are always on and the landing lights were switched using
the flaps because the Robin S has fixed gear. Extending the
flaps turns on the lights and fully retracting them turns them
off. Use care when working with these because the landing
lights will illuminate a dark room and they had me seeing
spots for a while.
Installing the motor was easy because everything lined up
perfectly. The motor box was attached using the supplied
hardware and Z- 42 threadlocker. The Hacker motor likewise
fit without any modification.
The optional tow hitch installs by removing the covering
and mounting it as shown. A servo-operated release is
important on the tow airplane in case of an emergency or
if the glider fails to release. SebArt RC even supplies a nice
fairing to cover the tow point, which was scuffed and glued in
place with canopy glue.
The cabin consists of a vacuum-formed floor, instrument
panel, and the plastic cabin top and windows. Decals are
provided for the instrument panel and seat backs. With those
in place, the hatch is assembled using canopy glue and left to
dry. When that was done, I installed the cowl, which aligned
nicely with the covering trim. When the assembly was done,
the peel-and-stick decals were applied to dress up the Robin S.
A Spektrum AR9020 receiver was installed and the radio
programmed with the throws recommended in the manual.
68 Model Aviation SEP TEMBER 2015 www.ModelAviation.com