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Wing Span:57in/1148mm;
Wing area:45.3sq.dm;
Length:57in/1148mm;
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.
Prop:14*7 or 15*7
Radio:4channels 4sevors;
Flying Weight:2080-2100g;
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Summary of Contents for GREAT PLANES Extra-300 50 EP
- Page 1 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.
- Page 2 Install the wheels onto the axles and secure with the wheel collars, as shown.
- Page 3 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.
- Page 4 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.
- Page 5 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.
- Page 6 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.
- Page 7 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.
- Page 8 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.
- Page 9 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.
- Page 10 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.
- Page 11 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.
- Page 12 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.
- Page 13 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!).
- Page 14 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.
- Page 15 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.
- Page 16 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"...