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first drive
By Joel Navarro
Back in the March 2016 issue, we reviewed Helion’s
first entry in its premium Select line: the Four 10SC 4WD shortcourse truck. The shaft-driven rig proved fast and capable, and left
us wondering what type of model might be next for the Select series.
And here’s the answer: the Four 10TR truggy. The 10TR cribs freely
from the Traxxas E-Revo in its body, wheel, and tire design but is all
original where it counts in the chassis, suspension, and drivetrain.
The Four 10TR uses the same platform and shaft system as the
10SC, but that’s where the similarities end. The 10TR’s suspension
is beefed up for abuse, with features that include bigger shocks,
thicker and wider suspension arms, and taller aluminum shock
towers. The power system is fortified too, and ready to top 55mph
on a 4S LiPo—which is not included—along with AAs for the radio.
But everything else you need to shred with the 10TR is in the box,
so let’s grab a pack and see how well Select’s short-course strokes
translate to monster-style off-roading.
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OCTOBER 2016 3
first drive
VEHICLE S PEC S
Composite Tub Chassis
Like many other shaft-driven vehicles, the 10TR’s modular chassis puts the electronic gear on the
right side of the truck, leaving plenty of room for the battery on the left where a pair of Velcro straps
hold it firmly in place. The straps are extra long, so you’ll have no trouble strapping a big 4-cell brick in
there if you want to go for max power. The front and rear suspensions can be removed
intact, and like the 10SC, the 10TR gets a fabric chassis cover to keep dirt and debris
out. The cover has an elastic hem that slips over tabs in the chassis, so it’s easy
to remove when you need to get to the electronics or make a battery swap.
Nice feature.
Tough-Truck Suspension
The 10TR’s suspension is beefed up considerably compared to the
10SC. The first thing that catches the eye are the threaded-aluminum,
13mm-bore shocks. Rubber boots protect the shafts, which are
3.5mm for extra strength, and each shock wears two springs to help
split the difference between the firmness needed for big hits and a
softer spring for cornering and small-bump compliance. The goldanodized aluminum shock towers are longer than those of the 10SC
to accommodate the TR’s longer shocks. The suspension arms are
also unique to the 10TR and considerably thicker with more reinforcing.
The plastic front-steering knuckle assembly and the rear hubs have a
generous amount of meat around the screw holes and hingepin locations,
which should make them resistant to breakage.
The chassis’ center section is
raised to help prevent highcentering on obstacles.
Radient 120-4T Speed Control and
Reaktor 4T 2850Kv Brushless Motor
Powering the 10TR is a water-resistant, fan-cooled
Radient Reaktor 120-4T speed control, which is
compatible with 2S–4S LiPo packs. A Deans-style plug
is standard, and the “Total System Protection” feature
protects the speed control and motor against overheating
as well as overcurrent damage. Programmable features
include drag brake, low-voltage cutoff, max brake force,
and punch mode. The speed control powers a sensorless
Reaktor 4T 2850Kv brushless motor, which delivers a
mountain of torque thanks to its long can and 4-pole rotor.
The chassis will be familiar
to 10SC owners, but the
suspension is all new.
The heavy-duty shocks are built
1/8-scale style and have 13mm
bores. Note the dual springs.
The 10TR’s chunky plastics are
built for abuse. Steel turnbuckles
set camber and toe. 12mm hexes
are standard, and rubber-sealed
bearings are used throughout.
Metal-Gear Drivetrain
Big tires and a 4S-rated power system put a lot of strain on the drivetrain, so Helion
loaded up the 10TR with plenty of metal between the motor and the wheels. The
main driveshaft is steel, as are the CV-type driveshafts that spin the wheels.
Metal ring and pinion gears equip the front, center, and rear differentials, and their
housings are sealed, so you can tune with oils if you really want to dig into it. The
front and rear gearbox halves key into thick gold-anodized aluminum bulkheads,
which tie into the suspension and help the gearboxes resist spreading under load.
With the exception
of the spur gear,
metal gears are
used throughout.
Removing the rear-suspension module reveals the center diff and spur gear, which is
32-pitch for extra strength and keyed to a large aluminum hub.
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Four bumper-mounted LEDs
are included—white up front,
red in the rear.
The cam-style
motor mount allows
a very fine gear-mesh setting and
holds the motor securely. The fan-cooled
Radient 120-4T speed control is ruggedly
built and fully programmable.
Item no.: HLNS1200
Price: $499
Scale: 1/10
Length: 21 in. (533mm)
Width: 15.2 in. (387mm)
Wheelbase: 12.8 in. (326mm)
Height: 8.6 in. (219mm)
Weight, as tested: 6 lb. 8 oz.
(2940g)
Chassis
Material: Composite plastic
Type: Tub
Suspension
Type: H-arm with steel
turnbuckle camber link
Inboard camber link
positions (F/R): 2/2
Outboard camber link
positions (F/R): 2/2
Shock positions, towers
(F/R): 2/3
Shock positions, arms
(F/R): 4/3
Shocks
Bodies: Threaded-aluminum
body, 13mm bore
Shafts: Plated steel, 3.5mm
Volume compensation:
Emulsion
Drivetrain
Type: Shaft-driven 4WD
Spur gear/pinion: 52T/13T
(32-pitch)
Differential F/C/R: Sealed
bevel metal-gear
Driveshafts F/R: Steel
CV-style
Bearings: Rubber-sealed ball
Wheels & Tires
Wheels: One-piece 3.8-inch
5-spoke, 12mm hex
Tires: All-terrain softcompound
Included Electronics
Transmitter: Ikonnik Xenon
ET4 2.4GHz
Receiver: Ikonnik 4-channel
water-resistant
Speed control: Radient
120-4T (2S–4S LiPo)
Motor: Radient Reaktor 4T
2850Kv brushless
Servo: Ikonnik High Torque
Test Gear
(not included)
Battery: MaxAmps 2S
5450mAh LiPo
OCTOBER 2016 5
first drive
Performance
It was extremely easy to get the Select 10TR out of the box and running. I
decided to go with a MaxAmps 2S 5450mAh LiPo for all-around testing, and
reserved a 3S LiPo for speed runs. The action began with street running
to make sure that everything was working properly and to log the truck’s
speed. With the stock gearing running a 2-cell LiPo, the 10TR clicked off a
GPS-confirmed 38.1mph, and the truck had no trouble wheelieing off the
line. I suspect the truck is geared conservatively so that you can run a
3- or 4-cell LiPo. If you’re only going to run a 2-cell LiPo, you can probably
gear up a couple of teeth on the pinion and get the 10TR to 40mph, if
you like a nice even number. I just left the gearing as is—38mph is fast
enough, and I’d rather have a little extra run time. High-traction-pavement
running should be a recipe for traction rolling, but the 10TR proved hard to
flip. Its wide stance kept the tires firmly planted on the ground, and the
soft suspension allowed for a lot of chassis roll but no flipping. With the
shakedown run out of the way, I headed for dirt at a nearby construction
site. I didn’t waste any time and threw the 10TR into action like a bowling
ball as I pinned the trigger.
The shocks’ relatively light
damping and dual-stage
springs let the suspension
compress and rebound
quickly, making short work of
rutted-out terrain and small
rocks that the 10TR encountered. Bigger hits and jumps
put the full suspension travel
range to work, with the tires
helping out too. There’s ample
cushion for the big stuff, and
the 10TR is a stable flier with
all the midflight control you’d
expect of a big brushless
truck spinning all four wheels.
A high-capacity 2S LiPo is
the sweet spot for all-around
Keep the front end low or let it ride high; the
fun, but I went ahead and
10TR’s adjustable wheelie bar lets you choose.
ran a 3S pack as well. The
10TR clicked off 57.3mph on
pavement and was on the ragged edge in the dirt—a gentle trigger finger
is essential if you want to keep the truck shiny-side up. Alternatively, you
can use the throttle endpoint setting to dial back max throttle a few clicks
so that you can clamp the trigger to the grip without pumping more power
through the truck than is appropriate for the conditions at hand. When you
really need to slow things down, use Beginner mode to clip throttle to 50%.
My 12-year-old niece had a blast driving 10TR on a 2S pack in Beginner
mode, with a top speed about 20mph. That’s fast for a new driver, and it
sure is a lot easier on the truck than whacking curbs at 38mph.
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Ikonnik ET4 2.4GHz
4-Channel Radio
The ET4 2.4GHz radio offers a lot
of adjustment, both electronic and
ergonomic. Three rubber grips are
supplied to suit a wide variety of hand
sizes and feel preferences, and the
transmitter is left-hand convertible.
The drop-down steering wheel can
swing fore and aft, or be mounted
directly to the radio body if you’re not
a drop-down fan. Wheel tension is also
adjustable, and digital trim switches
dial in endpoint and rate settings. Tenmodel memory with auto recognition
for Xenon receivers is built in, and the
steering channel includes endpoint and
dual-rate adjustments. Most unique
is the mode-selection system, which
uses a three-position switch
to select Standard mode or
Beginner mode, which reduces
max throttle by 50%. Or you
can center the switch to lock
the radio.
The Verdict
The Select Four 10TR is a tough and fun truck that’s suitable for any skill level.
On a 2S pack in Beginner mode, first-time drivers can learn the ropes without
shredding parts. Uncorked on the same 2S pack, the 10TR’s torquey power
system and near-40mph top speed make it fun on any surface. Go 3S and the
action really heats up—that’s skilled-driver territory, unless you’ve got a wideopen space to run. If you’re in the market for an easy-to-run, do-it-all truck, the
Select Four 10TR deserves a spot on your trucks-to-check-out list. ✇
Sources
Helion helion-rc.com
MaxAmps maxamps.com
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