Name: Rampage XT RTR Scale: 1/5 Price: $659.99 varies with dealer Length: 29.53" Width: 21.26" Wheelbase: 19.69" Weight (dry): 23.1 lbs Engine: Gas 30cc 2-Stroke Fuelie Transmission: Single speed metal gear Drive Train: 4-wheel drive (center spool, front and rear
fluid filled diffs) Fuel Tank Capacity: 500cc Fuel: Unleaded gasoline mixed with 2-stroke oil
Radio equipment: (Included) 2.4GHz Radio System
Eight AA batteries for transmitter
Air filter treatment oil
Big 1/5 Scale
Inexpensive to run
Long run times
2.4 GHz Radio
Powerful 30cc engine
Exhaust melts body
Bottoms out on large jumps
Steering servo is a little weak
Rampage XT RTR 1/5 scale monster truck
There are two things most guys like. "BIG & LOUD"!
The Redcat Rampage XT offers both of those. While the chassis
is like the Rampage XB-E, adding the large tires and huge truck
body make the Rampage XT seem much bigger.
The Rampage XT uses the same heavy duty chassis as the Rampage
XB-E. The beefy aluminum bottom plate and shock towers provide
plenty of back bone strength and the plastic roll cage protects
the components. The roll cage is constructed in sections and screwed
together allowing easy access to different parts of the vehicle
without having to remove the entire thing.
Wheels, tires, and drive train
The large monster truck tires are glued to black plastic rims.
The deep directional treads should grip the terrain with ease.
The metal drivetrain starts with a four gear single speed transmission
that transfers power to the center spool. The center spool directs
the torque toward the front and rear of the truck through heavy
duty steel dog bone drive shafts.
The power then reaches both front and rear oil filled differential
units which consist of two bevel gears and two planetary gears.
Two planetary gears are used instead of four. This allows the
two gears to be very large for added strength and durability.
Large steel dog-bones then transfer the power to each of four
wheels. Dog-bones are used in the rear and CVDs are used in the
front for minimal binding.
The Rampage XT is powered by a 30cc Fuelie 2-stroke engine with
heavy duty centrifugal clutch. The spring loaded clutch uses two
composite pads that transfer power to the vented clutch bell.
The single venturi carburetor uses a manual butterfly style choke
like the ones found in hand held grass trimmers. The choke is
easily adjusted using the large black handle.
High and low speed fuel mixture needles enable the operator to
fine tune the 30cc Fuelie. The high speed needle is easily accessible
but the low speed needle is blocked by the plastic roll cage.
A rubber fuel primer bulb is located on the top of the carburetor
to make starting the Fuelie easy.
A two stage foam air filter provides protection against dirt
and debris. A red kill switch with water resistant rubber shield
is mounted next to the pull starter providing means of starting
and stopping the engine in one central location.
A plastic roll cage protects the engine and H-CMR5 INT® spark
plug from damage. To remove the spark plug four screws must be
removed from the roll cage to allow clearance.
A 500cc gas tank is mounted behind the engine and is waiting
to be filled with a mixture of two stroke oil and unleaded gasoline.
A mixture of 20-1 is used for break-in and a mixture of 30-1 can
be used once the break-in process has been completed.
mounted fuel tank
The suspension design consists of a lower H-Arms and upper adjustable
links which are made of generous amounts of plastic. Providing
smooth suspension action are four adjustable oil filled threaded
body metal shocks. Sway bars help keep the chassis stable and
reduce side roll through cornering.
The shock towers are thick aluminum with a plastic facing. I'm
not sure why the plastic facing was used but it does look cool.
The shock towers offer a couple different mounting choices as
do the H-arms. This allows tuning of the suspension which changes
bump handling characteristics. Shock mounting position also affects
the way the vehicle feels through cornering.
The 2.4GHz radio system included with the Rampage XT runs off
eight AA batteries and includes functions such as servo reversing,
steering and throttle trims, steering dual rates, and a bind.
A receiver box in mounted to the left side of the aluminum chassis
and houses the 2.4GHz receiver, receiver battery pack, and on/off
switch. The switch lever is accessed from outside the receiver
box on the front. Padding for the receiver is not included and
I highly recommend fitting some foam around the receiver and battery
pack to avoid failure.
The Rampage XT is fitted with a fail safe device which is also
stored in the receiver box. The fail safe is easy to set and will
protect against frequency failure most likely due to run down
transmitter batteries or driving out of range. The fail safe should
be used inline with the throttle servo so when connection is lost
the brake will be applied.
A huge steering servo, measuring 2.5" across (NOT including
mounting tabs), is used to control the direction of the large
front tires and is protected by an adjustable servo saver.
A standard size servo is used to control throttle inputs as well
as braking inputs. The servo is held in place with four screws
and uses a standard two blade servo horn.
The Rampage XT needs to be broken in before the real fun can take
place but before anything, the receiver battery needs to be charged.
I plugged the receiver battery into the included charger the
night before I planned testing the Rampage XT. By morning the
battery was fully charged and ready to go.
The receiver tray offers plenty of room for the receiver and
battery pack but offer little shock resistance. I cut some black
foam I had stored for this reason and fitted it into the receiver
tray to safely secure both the receiver and battery.
I then installed the fail safe inline with the throttle servo
and set it the apply brake in case of an emergency. After testing
the fail safe and performing a radio range check I moved on to
oiling the air filter and mixing the gas.
I already had some unleaded gasoline, 2-stroke oil, and a funnel
for other gas vehicles that worked nicely for the Rampage XT.
I mixed the recommended 20 parts unleaded gas to 1 part oil for
the break-in process.
I primed the engine using the prime bulb, closed the choke, and
gave the pull chord a couple tugs. The engine fired once signaling
me to open the choke and pull again. Quickly the Fuelie started
up and idled smoothly. I let the engine idle through the half
of the first tank of gas only having to restart the engine twice.
Idling through 250cc of gas felt like forever and was close to
it. For the remainder of the tank I drove the truck around the
yard at 1/4 throttle.
The next two tanks of gas were used up at the park while fluctuating
from 1/4 to 1/2 throttle. I continued using a fuel mixture of
20 parts gas to 1 part oil for all three tanks.
On the third tank I tried giving it a little more throttle but
anything over 1/2 throttle caused the engine to bog as if it was
starving for fuel. The instructions say the engine will not need
to be tuned and the factory settings will be fine through break-in
and beyond. I disagree.
The low speed needle was set correctly but the high speed needle
was set too lean. I came to this conclusion by closing the choke
half way and giving it full throttle. As the choke restricted
the air flow, the truck ran better at full throttle but sputtered
at lower throttle inputs wanting to stall.
I then richened the high speed needle 1/4 turn allowing more
fuel to flow while in the upper throttle range. This completely
remedied the situation and the engine began winding up to the
expected RPMs at full throttle. The Rampage XT is now running
good I am ready to have some fun.
Performance & Handling
I wanted to test the Rampage XT somewhere that would accommodate
its large size and perhaps offer a challenge. I had been to a
place called "Wheelin'
in the Country" down in Summertown when I had my full
size Jeep and dune buggy. This place offers 800+ acres of trails,
hills, rocks, mud, and just about anything you would want to run
a 4x4 or ATV through. Of course all I needed to use were the few
acres of dirt and mounds near the entrance.
Well, I've got a 1/5 scale gas powered truck already broke-in,
permission to run on worthy terrain, my camera crew, and a full
tank of gas. Let's rock!
The Rampage XT started easily and calmly idled while I put the
massive body on and fastened the clips. A little blip of the throttle
and the clutch engaged sending the truck on its way. The ground
was dry and dusty from a lack of rain which sent clouds of dust
in the Rampage's wake. Although it created a slight problem for
the camera crew, it looked awesome!
The dust just billowed off the large monster truck tires as if
it were setting fire to the ground. At times the truck was hidden
from sight because of a thick dust cloud but a gentle breeze soon
It's necessary for added air filtration while running in such
dusty conditions. This can be accomplished by taping an additional
large foam element, found at an auto parts store, around the entire
air filter unit. This is cheap and easy insurance for your engine
and is recommended.
The truck is stable in all situations. From all my testing, I
didn't even roll the truck once and my testing included high speed
cornering on a multiple of surfaces as well as some jumping and
hill climbing. The Rampage XT has a low center of gravity which
makes for stable handling.
Turning the Rampage XT was a blast in the dirt. The loose surface
allows the rear to swing around half way through the turn allowing
tight turns and much fun.
Turning on pavement proved to be a different experience. The
only way the truck would turn sharply was off throttle or full
on. Low amounts of throttle coupled with a high traction surface
would cause the steering servo to center out some which created
a large turn radius. Turning at low throttle was still very possible,
but not near as sharp as I would expect from such a large servo.
A more powerful receiver battery pack may remedy this but I did
not have one in my possession so I am left unsure. I just pegged
it half way through the turns and the wheel spin would help send
the truck through the remainder of the turn.
Acceleration was great on any surface. The engine was responsive
with only slight hesitation while pegging the throttle from a
dead stop. This was later remedied with a bit of tinkering on
the low end needle. From that point on the engine wound out great
with next to no hesitation.
The single speed transmission quickly sends this truck to a respectable
top speed. The Rampage XT can be driven in a mid sized yard but
prefers to have some extra breathing room to stretch its legs.
Stopping the Rampage is a breeze. The double duty disc brake
locks the tires with ease. It is a little tricky finessing the
brakes to keep them from locking up. Once large amounts of dust
entered the braking mechanism, they wanted to lock up without
any brake input from me. This was slightly irritating and as you
can imagine this caused the clutch to heat up quickly which showed
in the body. I put full blame on the excess dust and debris. All
other testing grounds like pavement and grass did not introduce
this problem. After a good cleaning and some adjusting, the problem
The exhaust from the engine blows directly on the rear of the
body quickly warping it and over a prolonged time, greatly distorted
the tail gate. I decided to cut out the rear of the truck body
to allow the exhaust to escape hoping this would help. I believe
I will also need to install some 45 degree exhaust tips to direct
the flow of heat beneath the body.
The Rampage XT has decent mid flight jumping characteristics,
however the suspension bottoms out upon landing large jumps causing
chassis slap virtually every time. It isn't good for a truck this
heavy to be smacking the ground for obvious reasons so I am left
with two options. I can either stay away from big air or beef
up the suspension with stiffer springs and heavier shock oil.
Replacing the piston damper with one with fewer or smaller holes
will also help.
I must say the Rampage XT is a durable vehicle. I put it through
some tough situations and the Rampage XT came out on top.
A word of caution for new RC drivers. The Rampage XT is fast
and heavy. A truck of this size and weight carries much momentum.
Hitting something, or someone, while traveling at even mid speeds
will cause damage. While the Rampage may come out undamaged, whatever
you hit will not. Please be careful running any RC vehicle, especially
one of this size.
The Rampage XT delivers runs times of about 30 minutes. Depending
on your driving style and tuning capabilities, you can have run
times from 20-35 minutes.
See the Rampage XT
The Rampage XT is definitely a ton of fun. It's powerful, fast,
The Rampage XT handles well except for bottoming out on large
The engine runs great and only needed minor adjustments.
500cc gas tank offers 20-35 minute run times.
Heavy duty aluminum chassis coupled with thick plastic components
offer a durable setup.
RedCat Racing 23
West Watkins Street
Phoenix, AZ 85003
The comments, observations and conclusions made in this review are solely with respect to the particular item the editor reviewed and may not apply generally to similar products by the manufacturer. We cannot be responsible for any manufacturer defects in workmanship or other deficiencies in products like the one featured in the review.