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3 D H O B B Y S H O P . C O M
48” EPP Extra 330SC
Thank you for purchasing this 3DHobbyShop ARF RC aircraft. If you have any issues, questions,
concerns or problems during assembly, please contact our tech department at:
or 717-814-5316 10am-4pm Eastern M-Thur.
We highly recommend
as a good source for RC tips, tricks, and information.
SAFETY in Assembly
During assembly of this aircraft, you will be asked to use sharp knives and hobby adhesives. Please
follow all safety procedures recommended by the manufacturers of the products you use, and always
follow these important guidelines:
ALWAYS protect your eyes when working with adhesives, knives, or tools, especially power tools. Safety
glasses are the best way to protect your eyes.
ALWAYS protect your body, especially your hands and fingers when using adhesives, knives, or tools,
especially power tools. Do not cut toward exposed skin with hobby knives. Do not place hobby knives on
tables or benches where they can roll off or be knocked off.
ALWAYS have a first-aid kit handy when working with adhesives, knives, or tools, especially power tools.
ALWAYS keep hobby equipment and supplies out of the reach of children.
IMPORTANT NOTE – We strive to provide the absolute best-quality ARF aircraft on the planet. However,
the ultimate success or failure of this aircraft is dependent upon proper assembly by you. If you have
questions about an assembly step, please contact us, or read the assembly thread for your airplane on
RCGroups.com before proceeding. It is always better to slow down and be sure of your assembly than to
rush through it and make a mistake which can cause a crash.
SAFETY in Flying
SAFETY NOTICE: This is NOT a toy! It is a very high-performance RC airplane capable of high speeds
and extreme maneuvers. It should only be operated by a competent pilot in a safe area with proper
ONLY fly your aircraft in a safe, open area, away from spectators and vehicles–and where it is legal to fly.
NEVER fly over an unsafe area, such as a road or street.
NEVER fly near overhead power or utility lines. If your airplane ever becomes stuck in a line or a tree DO
NOT attempt to retrieve it yourself. Contact the authorities for assistance in retrieving your aircraft.
Power lines are DANGEROUS and falls from ladders and trees CAN KILL!
Never fly too close to yourself or spectators. Spinning propellers are DANGEROUS!
Never run your motor inside a house or building with the propeller attached – Remove the prop for safety.
Always fly within your control.
Always follow manufacturer’s instructions for your radio system.
Always obtain proper insurance before flying – contact the AMA at
CA Glue – Thin and Medium
Welders Contact Adhesive
Small Phillips Screwdriver
Set Metric Allen Wrenches
Assembly Instructions – Read completely before starting assembly!
Unpack your airplane and examine the components. Check for damage of any kind. If you have
damage, please contact 3DHobbyShop to discuss.
Attach the trailing edge pieces to the wing at the wing root with either Welders adhesive or CA.
Install aileron control horns with either medium CA or Welders adhesive. Opening of the slot in the plywood stiffener may
be required to insert the control horn.
Assemble the ailerons onto the wings, flex them up and down to check for free motion, and drip thin CA
glue onto each hinge. Be sure to allow ample time to dry.
Install servo as shown. Due to the variety of servos suitable for the Extra, a small amount of trimming may be required to
fit your choice of servos.
Servo connectors are installed onto servo arms as shown. Drill the holes in your servo arms to the right
size to allow the connectors to easily spin on the servo arm. Attach with the nut, but do not tighten all the
way, the connector must remain able to twist on the servo arm. Lock the nut with a drop of medium CA so
that it cannot vibrate loose in the air. The pushrod can be cut to length. The elevator and rudder will use the same system.
Next, install the hooks into the root of the wings with either Welders or medium CA. Be sure the open end of the hook
points up, as this provides the wing attachment system.
On to the fuselage, remove the elevator from the horizontal stabilizer. Insert the elevator in the slot for the horizontal
stabilizer. You will find it is easier if the elevator is upside down and backwards as shown.
The elevator can then be turned over once installed in the slot.
Locate the carbon wing spar tube and insert it into the fuselage. The carbon tube is NOT to be glued in, it
is to remain removable. Insert the horizontal stabilizer into the fuselage as shown. Measure from the
tube to the stabilizer on both sides of the fuselage as shown to make sure the stabilizer is straight.
Measure the stabilizer side-to-side to make sure it is centered. Also, look from the rear to be sure the horizontal stabilizer is
parallel with the wing tube.
Apply thin CA glue to the joint of the horizontal stabilizer and fuselage. Allow the thin CA to wick into the
Install the elevator control horn the same as the aileron control horns.
Insert elevator back into the horizontal stabilizer and glue the hinges using the same technique as the aileron hinges. Tape
the elevator as show to keep the the elevator from moving will the CA dries. You will find the CA takes longer to setup in
the EPP then when used on balsa.
Next, position the rudder as shown to locate the hinges in the vertical stabilizer. Mark their location.
With a sharp knife, open up a slot for the rudder hinges in the vertical stabilizer.
Dry fit the rudder hinges in to the vertical stabilizer. Glue the rudder control horn in place.
Slide the rudder hinges into slots you previously opened with a hobby knife in the
vertical stabilizer. The rudder hinges may be glued with the same technique as the
elevator. Next glue the plywood tailwheel bracket to the rear of the fuselage with
medium CA or Welders glue. Be sure to install bracket with out creating binding of
Locate the tailwheel assembly
and the plywood bracket. Glue the tailwheel wire
into the tube imbedded in the front of the rudder.
Next, install the rudder and elevator servos. Using string and a weight will help fish the servo extensions through the
Connect the push rods using the same system as the ailerons.
Next, mount the motor and ESC. If using the recommended Omega 130g motor, the firewall is pre-drilled for the motor's
X-mount. It is a bit of a challenge getting the provided metal wood screws past the magnetic motor. Tacking the screw to
the screwdriver with glue is one suggestion.
Mount the ESC in the open bay on the bottom of the fuselage, behind the firewall. The ESC may be glued directly to the
EPP foam or attached with velcro. When attaching velcro to the EPP surface, we suggest a small amount of Welders glue
smeared over the area and allowed to dry. This helps “prime” the area and allows the velcro to adhere better.
Also, install a length of Velcro for the battery.
Mount the receiver and route all servo wires.
Onto the landing gear assembly.
Mount the wheels and wheel pants as shown. While the wheels are held on with wheel collars, the wheel pants are glued to
the wire with either Welders adhesive or medium CA. The small rectangles of thin EPP are to reinforce the inside of the
wheel pant where the axle exits.
The wheel pants can also be made stronger with a small bead of Welders on the bottom.
Attach the gear legs with either Welders or medium CA.
Once the glue has dried on the landing gear assembly, insert the landing gear into the fuselage. Apply either Welders or
medium CA to the plywood insert and press into the landing gear block.
The wings are held on with the provided rubber bands wrapped 2-3 times around the wing hooks.
Plug your servos and ESC into your receiver, attach your battery and test your radio system. Check for
correct motor running direction now, before your prop is installed. Never run your motor inside a
building with the prop installed. Check for correct servo direction, reverse as necessary. Center all
control surfaces and tighten pushrod adjusters securely.
Control Throws and Exponential
Low/Precision Rates (in degrees and inches) and Corresponding Exponential
Aileron 15 degrees .75” 30% Expo
Elevator 13 degrees 1.25” 30% Expo
Rudder 45 degrees 3.5” 75% Expo
High/3D Rates (in degrees and inches) and Corresponding Exponential
Aileron 35 degrees 2” 75% Expo
Elevator 45 degrees 3” 75% Expo
Rudder 45 degrees 3.5” 75% Expo
The above throw measurements were taken at the aft edge of the ailerons and
elevator, and from the bottom aft edge of the rudder. Keep in mind that even the low throws
mentioned here are relatively aggressive, so be sure to also program the matching
exponential listed to help soften the model’s feel around center stick.
Balance your Extra at a point 4.5” behind the leading edge of the wing where the wing meets the fuselage.
This is a good starting point. As you become accustom to the aircraft, you can adjust the CG to suit your preference.
Install your propeller
NOTE: Small brushless motors typically have aluminum prop adaptors with aluminum screws threads.
These threads are easily stripped or broken. DO NOT apply too much torque when tightening your
prop. A wrench is not necessary, it applies too much torque. We prefer a nut-driver.
Be sure to check the motor manufacturer’s recommendations for help in selecting a prop. Test your
power system in a safe manner on the ground before ever attempting to fly your aircraft. Range check
your radio system according to manufacturer’s instructions.
Make your first flight with the controls set on low rates. During the trimming phase, we recommend
landing with some throttle, not attempting to “dead stick” the airplane. This may mean you need to time
your flights and keep them a bit shorter than usual. After your first flights, check all control connections
and motor and prop mounts for tightness.