GREAT PLANES Extra-300 50 EP User manual

Wing Span:57in/1148mm; Prop:14*7 or 15*7
Wing area:45.3sq.dm; Radio:4channels 4sevors;
Length:57in/1148mm; Flying Weight:2080-2100g;
CAUTION : this plane is not a toy and should be kept away
children under 16 years of age! Before use , please carefully read
this manual.
First-time builders should seek advice from people having building experience in order to
assemble the model correctly and to produce its Performance to full extent.
Assemble this kit only in places out of children’s reach!
Take enough safety precautions prior to operating this model.
You are responsible for this model’s assembly and safe operation!
Always keep this instruction manual ready at hand for quick reference, even after completing
the assembly.

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.
Attach the gear to the fuselage with short 3mm screws, use loctite. Install gear cover plate as shown. We have used clear
tape in this photo, but thick CA or epoxy glue works well.

Measure back 2.25” from the hinge line on the bottom of the rudder. This is where we will install the
tiller guide for the tailwheel. Make a hole in this location (using a 1/16” drill bit or the end of one of
the wire pushrods in your kit) and glue the tailwheel tiller guide as shown with medium or thick CA.

Install tail wheel as shown. Use two wood screws to secure bracket to fuselage. Remove the set
screws in the tailwheel assembly, apply loctite and re-tighten.
Remove a square or two of covering on the bottom of the fuselage behind the wing as shown, for
cooling.
Remove covering as shown from horizontal stabilizer opening and rudder pull-pull wire slot.
Remove covering from the elevator servo opening on the left side of the fuselage as shown.

Remove the covering over the wing spar tube hole, the wing bolt hole, and the other holes in the front
of the fuselage as shown.
Insert the horizontal stabilizer into its slot. Do not glue yet.

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.
Note – The Extra 330 uses a single HS-225MG or HS-5245MG servo to activate the elevator. If you use an
extremely powerful motor/battery combination over 1100W, you may want a second elevator servo. The
mounting location for a second elevator servo is installed into the airplane on the other side of the fuselage, and
the hardware is included.
NOTE: The elevator joiner is only used with a single elevator servo. Dual elevator servo installations do not
use the joiner.

Remove the covering from the inner hinge area of each elevator as shown. There is a loose balsa filler
piece under the covering. Remove it as shown, opening up the elevator joiner slot in both of the
elevators. Locate one control horn and modify it as shown to fit in the left elevator. We used a small
file, a Dremel tool also works well.
Use a generous amount of medium or thick CA glue to install both the joiner and the elevator control
horn into the left elevator as shown.

Apply a generous amount of medium or thick CA glue into the joiner slot on the right elevator and
install onto the horizontal stab, gluing the hinges with thin CA.
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.

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.
Note: We recommend the use of Dubro high strength long servo arms.
Mount elevator servo as shown, attach the pushrod to the elevator horn with a 2mm screws, washer,
and nut. Use medium CA glue to lock the nut onto the 2mm bolt to keep the screw from coming loose
due to vibration. Tighten the pushrod connector with a 1.5mm hex wrench.

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.

Mount the rudder servo and assemble the connectors onto the rudder servo horn as shown. Assemble the front
ends of the pull-pull cables as shown, double looping the wire through the crimp sleeve. 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. The firewall of
the Extra 330 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 you motor is compact (like the Torque 4014 or
Reaper GR-45 or 60) you will need to supply spacers to extend the motor forward as shown. Mount your ESC
to the side of the motor-mounting box.
Note: Do not use motors that is over 300g as it will likely to make the plane head heavy.

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. The following procedure is helpful to be sure
the wood screws hit the plywood squares. 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!).
Tape small pieces of paper over the plywood cowl-mounting tabs as shown. Install the cowl and align.
Use the small pieces of paper as guides to make holes in the cowl and install the wood screws.
Remove the cowl and screws and soak the plywood mounting tabs in thin CA glue. This will
strengthen the mounting tabs. Re-install the screws.

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 exactly as you did the elevator pushrod. Assemble the pushrod
connectors onto the servo arm and install the pushrod as shown. Be sure to use medium CA glue to
lock the 2mm nut that holes the ball link onto the control horn. Repeat for other wing. Mount the
wings to the fuselage using the black nylon thumbscrews.
You can mount your receiver 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.
Balancing – Balance your Extra 330 108mm behind the leading edge of the wing where the wing
meets the fuselage. During your maiden flight, this is approximately on the forward edge of the carbon
wing spar tube. Move the flight battery to balance as necessary.
Remember – It is much more important to have a properly balanced airplane than to save one ounce of
total weight. The Extra 330 carries additional weight very well because of its superior aerodynamic
design, and nose weight 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 affect on flight characteristics.

Control Throws (in degrees and inches) and Corresponding Exponential
Control Throws
Elevator
Low rate - 15 degrees - 1.25" deflection - 30% expo
High rate - 55 degrees - 4" deflection - 80% expo
Rudder
max throw - just short of touching elevator - 80% expo
Ailerons
Low rate - 17 degrees - 1.75" deflection - 30% expo
High rate - 30 degrees - 2.25" defection - 60% expo
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