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3D Hobby Shop 57” Extra 330 SC Assembly Manual

Made by: 3D Hobby Shop
Type: Assembly Manual
Category: Toy
Pages: 16
Size: 1.05 MB


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3 D  H O B B Y S H O P . C O M



Assembly Manual- 57” Extra 330 SC 


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 1-830-990-6978 10am-5pm Central M-F 


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 




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CA Glue – Thin and Medium and Thick 
Hobby Knife 
Small Phillips Screwdriver 
Set Metric Allen Wrenches 
Small Pliers 
Masking tape 
Wire Cutters 
Drill and drill bits 
Optional – Heat gun and covering iron 
Threadlocker (Blue Loctite) 

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. 
Your airplane was packed in plastic at the factory without any wrinkles in the covering.  You may notice 
some wrinkles now; more likely, you will notice a few in a day or two or the first time you take the plane 
out to the flying field.  These wrinkles are the result of wood shrinkage and/or expansion.  Balsa wood 
changes size and shape slightly as it is exposed to varying humidity in the air.  This is a natural property 
of balsa wood.  As your airplane adjusts to the weather in your part of the world, wrinkles may appear and 
disappear.  Wrinkles may be removed with the gentle application of heat to the covering material on your 
airplane.  The best tools to use are a heat gun and covering iron.  Apply the heat gently: the covering 
material will shrink as you apply the heat, and this will remove the wrinkles.  BE CAREFUL!  Too much 
heat applied too quickly can damage the covering, either by causing it to pull away from the wood at 
seams and corners or even by melting it.  The covering will shrink at low temperature with patient 
application of heat.  

Wrinkles in the covering DO NOT affect flight performance. 

 If you must shrink on 

a color-seam, use the iron and go slowly and carefully to avoid any pulling or lifting at the seam. 
Remove the canopy before attempting to use heat on your covering!  The canopy is made of thermo-
activated plastic and WILL deform with the application of heat.  Do not apply heat to the canopy. 
If you need to clean your airplane, we recommend using a damp towel.  The paint used on the canopy 
and cowl is not safe for all cleaners.  In particular, DO NOT use alcohol on these parts, it will remove the 


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Install the wheels onto the axles and secure with the wheel collars, as shown. 





Slide one wheel/axle assembly into a wheel pant, and install the wheel assembly on the landing gear leg.  
Tighten the locknut as shown to secure the assembly onto the gear leg.  Repeat for other side.  Install 
wood screw through drilled hole in gear leg into pant. 


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Attach the gear to the fuselage with short 3mm screws, use loctite. 




Install gear cover plate as shown, with clear tape, thick CA or epoxy glue. 






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Remove covering over horizontal stabilizer slot on both sides of fuselage as shown.  Remove covering 
over elevator servo opening on LEFT side of the fuselage as shown. 




Remove covering over wing spar tube hole and wing pin holes in fuselage as shown. 



Install rudder onto fuselage and apply 2 large drops of thin CA to each hinge. 




Remove covering over control horn slot in rudder.  Install double-sided rudder control horn as shown with 
plenty of medium or thick CA, or epoxy glue.  Install tail wheel as shown with two small wood screws.  
Remove the set screws in the tailwheel assembly and re-install with blue loctite. 


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Remove a square or two of covering on the bottom of the fuselage behind the wing as shown, for cooling. 




Insert the horizontal stabilizer into its slot.  Do not glue yet.  Center the stabilizer side-to-side in the slot 
using a ruler.   



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Install the carbon wing spar tube into the fuselage (Note –  never glue the carbon wing spar tube to the 
airplane, it is designed to be removable).  Install the wings temporarily.  Measure as shown in the 
illustration.  Make sure this measurement is the same on both sides. 


When stabilizer is centered and aligned, drip Thin CA glue onto the stab-to-fuselage joint top and bottom.  
NOTE:  We do not remove any covering form the horizontal stabilizer.  This keeps the stabilizer strong, 
and thin CA makes an excellent joint to covering material.


If your stab joint is not tight enough for thin CA 

glue, or if you have to trim the opening to align the stab, you can use thick CA glue as well.  


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Install the elevator half with the fiberglass joiner rod onto the stabilizer.  Makes sure it flexes easily at 
least 45 degrees up and 45 degrees down.  Apply thin CA glue to the hinges, 2 large drops on each.   




Place a generous amount of medium or thick CA into the joiner slot on the remaining elevator, and slide 
the elevator into place on the stabilizer.  Make sure it is aligned and flexes easily at least 45 degrees up 
and down.  Glue the hinges with thin CA. 





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Assemble elevator pushrod as shown.  Use thin CA on the ball-link to pushrod joint after installation to 
lock the ball-link onto the pushrod permanently.  Slide carbon tube stiffener over pushrod. 




Install the pushrod connectors onto the servo arms as shown.  Tighten the nuts just to a snug fit – the 
connector must be able to rotate after installation.  Use medium CA glue on the nut to keep the connector 
from falling off due to vibration.  Remember – the pushrod connector must be able to rotate so that the 
servo arm can move. 



Remove covering over elevator horn slot and install elevator control horn into elevator as shown using a 
generous amount of medium or thick CA glue.  Install elevator pushrod onto horn as shown.  Tighten the 
ball-link to the elevator horn using a 2mm screw, washer, and nut.  Once the 2mm screw and nut are 
tight, use medium or thick CA glue to lock the nut in place so it cannot rotate.  Make sure the 2mm screw 
and nut cannot come loose in flight.  


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Install elevator servo with servo output spline toward front of plane and install arm and tighten pushrod 




The rudder pull-pull cables are assembled as shown in the above diagram.   



Assemble the pull-pull wires onto the rudder horn as shown, double-looping the wire through the brass 
crimp sleeve before crimping.  Crimp the brass crimp sleeve tightly with pliers and apply a drop of thin CA 
to the crimp.  Be SURE to use medium or thick CA to lock the 2mm nuts on the rudder control horn.  Feed 
the wires into the fuselage slots and forward to the front of the fuselage.  Cross the wires once so they 
make an X inside the fuselage.   


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Mount the rudder servo and assemble the connectors onto the rudder servo arm as shown.  Note that the 
connectors must be free to rotate on the servo arm.  We use CA to lock the nut on the bottom of the 
connector for this reason.   
Assemble the front ends of the pull-pull cables as shown, double looping the wire through the crimp 
sleeve.  NOTE:  the pull-pull cables cross over once inside the fuselage, forming an “X”.  Adjust your pull-
pull cables to be snug, with no sag, but not too tight.  “Banjo-string-tight” pull-pull cables only sap the 
power from your rudder servo and cause poor handling.  Just snug is all you need.   



Use the X-mount for your motor to mark the firewall for drilling.  Drill the 4 mounting holes. 


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The firewall of the Extra is arranged to allow the widest possible selection of motors to fit.  Extra space 
has been provided for long motors and long prop adaptors.  For this reason, if your motor is compact, you 
will need to supply spacers to extend the motor forward as shown.  Attach the motor using the included 
4mms screws and blind nuts, using loctite.  Mount your ESC to the side of the motor-mounting box.   
The cowl is mounted onto the fuselage with 4 wood screws.  These screws go into the small plywood 
squares on the front inside of the fuselage.  Soak these squares in thin CA glue to harden them before 
The following procedure is helpful to be sure the wood screws hit the plywood squares. 
First, make small holes into the plywood squares through the covering, with the cowl and canopy off.  
Tape small pieces of paper over these holes, as shown, and mark the hole locations on these pieces of 


Install the canopy hatch 

(if the canopy hatch is not installed when you fit the cowl, it may be 

impossible to fit the canopy hatch after the cowl is installed!).



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When you are satisfied with the cowl fit, tape the cowl to the fuselage with masking tape.  Use the small 
pieces of paper as guides to make holes in the cowl and install the wood screws.  Remove the screws 
and cowl, and soak the plywood mounting tabs in the fuselage with thin CA to harden them.  Re-install 
cowl and screws. 




Glue the aileron hinges with two large drops of CA per hinge. 


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On the bottom of the wings, locate the servo cutout and aileron control horn slot.  Remove the covering 
over both.  Glue the horn into the slot with a generous amount of medium or thick CA.  Use the string in 
the wing to pull the servo wire through the wing.    


Assemble the aileron pushrods.  Assemble the pushrod connectors onto the servo arm as you did for the 
elevator and rudder arms, and install the pushrod as shown.  Be sure to use medium CA glue to lock the 
2mm nut that holds the ball link onto the control horn.  Repeat for other wing.  Mount the wings to the 
fuselage using the black nylon thumbscrews. 
Locate the balsa receiver mount marked “Rx”.  You can mount your receiver to this mount with Velcro and 
use CA glue to mount the balsa to the airframe.   
Apply one side of the self-adhesive Velcro tape to the battery tray, the other to your battery.  Use the 
Velcro strap as a “seatbelt” to hold your battery in position.  Always make sure your battery is firmly 
strapped down before flight. 
Your Extra SC includes optional Side-Force-Generators (SFG’s) for the wingtips.  Install them as shown 
with the spacers in-between the SFG and the tip.  It is a good idea to use thin CA glue to harden the 
screw holes in the wingtips, this will allow you to remove and insert the SFG screws many times. 


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NOTE:  Your Extra includes a decal set.  The wing decals are large and installing 
them is a two-person job.  When you cut around the decal and remove it from its 
backing sheet, have an extra pair of hands available to prevent the decal from 
curling back on itself. 





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 – Balance your Extra 108


 behind the leading edge of the wing where the wing meets the 

fuselage for your maiden flight.  This is approximately on the forward edge of the carbon wing spar tube.  
Move the flight battery to balance as necessary.   
Our preferred CG for 3D aerobatic flight is 120-125mm.  This is approximately on the rear edge of the 
carbon wing spar tube.    


Remember – It is much more important to have a properly balanced airplane than to save one ounce of 
total weight.  The Extra carries additional weight very well because of its superior aerodynamic design, 
and noseweight can always be removed again if desired.  After you have flown several flights, you can 
tune your CG to suit your personal flying preferences. 
When you experiment with CG location, move the CG only small amounts, 1/8 inch or so, at a time.  A 
small change in CG can have a large effect on flight characteristics.   


Control Throws  (in degrees and inches) and Corresponding Exponential 
Control Throws  
Low rate - 15 degrees - 1.25" deflection - 30% expo 
High rate - 55 degrees - 4" deflection - 80% expo 
max throw - just short of touching elevator - 80% expo 
Low rate - 17 degrees - 1.75" deflection - 30% expo 
High rate - 30 degrees - 2.25" defection - 60% expo 
Remember, JR and Spektrum radios use positive (+) exponential, Futaba and Hitec use negative (-). 
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. 
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, and 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. 

We hope you enjoy your 



Be sure to look for new aircraft and products coming soon from  

3 D  H O B B Y S H O P . C OM 


Copyright 2009 3D Hobby Shop