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Model Tech Sukhoi SU-31 Assembly Instructions Manual

Profile 3d arf
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Check out our website for more information on this and other exciting Model tech products!
The Model Tech Sukhoi SU-31 Profile 3D ARF is distributed
exclusively in North America by Global Hobby Distributors
and in the U.K. by YT International
All Contents Copyright © 2006, Global Hobby Distributors
Version 1 September 2006
Wing Span: 46.25 Inches (117.5cm)
length: 49 Inches (124.5)
functions: Ailerons, Elevator, Rudder and Throttle
radio required: 4-Channel or More w/5 Standard Ball Bearing Servos (Computer Radio with Mixing Preferred)
This R/C airplane is not a toy! If misused or abused, it can cause serious bodily injury and/or damage to property. Fly only in open areas and preferably
at a dedicated R/C flying site. We suggest having a qualified instructor carefully inspect your airplane before its first flight. Please carefully read and
follow all instructions included with this airplane, your radio control system and any other components purchased separately.
Made in China
http://ModelteCh.GloBalhoBBY.CoM
A SSEMB LY INSTRUCTIONS
root Cord: 16.5 Inches (42cm)
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Weight rtf: ~3.75 Pounds (1.7kg)
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Sukhoi Su-31 profile 3d arf featureS
Prebuilt From High-Quality Balsa and Light Plywood
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Laser-Cut Parts for Precsion alignment and Maximum Weight Savings
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Huge Control Surfaces for Maximum Aerobatics
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Light Wing Loading Results in Great Flight Performance
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Minimal-Length Control Linkages for Solid Control Response
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Factory-Covered with Monokote
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Strong Aluminum Main Landing Gear
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Includes a Generous Hardware Package
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Fast and Easy Assembly - Over 80 High-Resolution Digital Photos to Guide You
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SpeCifiCationS
tip Cord: 12.5 Inches (31.75cm)
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Wing loading: ~13 Ounces/Square Foot (40gr/dm
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engine required: .40 - .52 Two-Stroke or .70 Four-Stroke
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SafetY WarninG
Page 
Wing area: 667 Square Inches (43dm
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2
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Kit Product Number 123741
2
)

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  • Page 1 Check out our website for more information on this and other exciting Model tech products! http://ModelteCh.GloBalhoBBY.CoM A SSEMB LY INSTRUCTIONS Sukhoi Su-31 profile 3d arf featureS The Model Tech Sukhoi SU-31 Profile 3D ARF is distributed Prebuilt From High-Quality Balsa and Light Plywood exclusively in North America by Global Hobby Distributors and in the U.K.

  • Page 2: Table Of Contents

    Check out our support website at http://globalservices.globalhobby.com. There you will find public message boards frequented by other Model Tech product owners and the Model Tech technical support staff. This is a great place to get quick answers and advice on your new product.

  • Page 3: Our Recommendations

    What enGine Should i uSe? The Sukhoi SU-31 Profile 3D ARF can be flown using either a two-stroke or a four-stroke engine. We suggest using a .40 - .52 size two-stroke engine or a .70 size four-stroke engine. The airplane will fly great using any engine within the recommended size range, although for the best aerobatic performance we suggest using an engine at the upper end of the size range.

  • Page 4: Tools And Supplies Required

    toolS and SupplieS reQuired ❑ 5 and 30 Minute Epoxy ❑ Straight Edge Ruler ❑ Thin and Thick C/A ❑ Pencil ❑ C/A Debonder ❑ Airplane Stand ❑ # 1 and # 2 Phillips Head Screwdrivers ❑ T-Pins ❑ 2.5mm Hex Wrench ❑...

  • Page 5: Kit Contents

    kit ContentS Before you begin assembly, group the parts as we list them below. This will ensure that you have all of the parts before you begin assembly and it will also help you become familiar with each part. IF YOU FINd ANY PARTS MISSING OR dAMAGEd, PLEASE CONTACT US dIRECTLY, USING ThE CUSTOMER SERVICE INFORMATION ON PAGE 2.

  • Page 6: Wing Installation

    fuel tank aSSeMBlY ❑ (1) 190cc Fuel Tank ❑ (1) Rubber Stopper ❑ (2) Aluminum Plates ❑ (1) Aluminum Support Ring ❑ (3) Aluminum Tubes ❑ (1) Silicone Tubing ❑ (1) Clunk ❑ (1) M3 x 20mm Machine Screw MiSCellaneouS partS ❑...
  • Page 7 ❑ Slide the wing into the fuselage and line up the two outer marks with the sides of the fuselage. ❑ When satisfied with the alignment, hold the front of the wing in place, using a couple of T-Pins. IMPORTANT The two outer marks that you drew should be even with the sides of the fuselage.

  • Page 8: Stabilizer Installation

    ❑ Use a heat-sealing iron to adhere the covering material down where you cut it. ☞ This will keep the covering material from wrinkling or pulling loose while you install the wing. ❑ Apply a strip of masking tape to the top and bottom of one half of the wing.
  • Page 9 Step 1: aliGninG the horiZontal StaBiliZer ❑ Remove the elevator from the stabilizer and set it aside for now. ❑ Carefully measure and draw a centerline mark on the top of the stabilizer at the trailing edge. ❑ Slide the stabilizer into the fuselage and center it at only the trailing edge by carefully centering the mark you drew on the stabilizer with the center of the stabilizer mounting slot.
  • Page 10 Step 2: inStallinG the horiZontal StaBiliZer ❑ Once you're satisfied with the alignment, draw a line on each side of the stabilizer where it meets the fuselage. Do this on both the top and the bottom. ❑ Remove the stabilizer from the fuselage, then carefully cut away the covering material from inside the lines you drew.

  • Page 11: Control Surface Hinging

    ❑ Once you're satisfied with the alignment, draw a line on each side of the stabilizer where it meets the fuselage. ❑ Remove the stabilizer from the fuselage, then carefully cut away the covering material from below the lines you drew. Remove the covering material from the bottom of the stabilizer, too.
  • Page 12 ❑ Slide one hinge into each of the four hinge slots in one aileron, making sure that you push each hinge in up to the T-Pins. IMPORTANT Don't glue the hinges into the aileron yet. ❑ Push the aileron and hinges into the corresponding four hinge slots in the trailing edge of the wing.

  • Page 13: Sealing The Control Surface Hinge Gaps

    SealinG the Control SurfaCe hinGe GapS YoU'll neeD The FolloWing ToolS AnD SUPPlieS: ❑ Modeling Knife ❑ Heat-Sealing Iron ❑ Straight Edge Ruler ❑ Monokote White Covering Material ❑ Pencil IMPORTANT It is imperative that the aileron and elevator hinge gaps be sealed. Failure to do this can lead to control surface flutter, which can cause your airplane to crash.

  • Page 14: Tail Wheel Installation

    tail Wheel inStallation YoU'll neeD The FolloWing PARTS FRoM The KiT: ❑ (1) Tail Wheel Wire ❑ (1) Wheel Spacer ❑ (1) Tail Wheel ❑ (1) Wheel Collar with Machine Screw ❑ (1) Landing Gear Strap ❑ (2) M3 x 12mm Wood Screws YoU'll neeD The FolloWing ToolS AnD SUPPlieS: ❑...

  • Page 15: Main Landing Gear Installation

    Main landinG Gear inStallation YoU'll neeD The FolloWing PARTS FRoM The KiT: ❑ (2) Aluminum Landing Gear Brackets ❑ (5) M3 Lock Nuts ❑ (2) Main Gear Wheels ❑ (2) Wheel Collars with Machine Screws ❑ (3) M3 x 25mm Machine Screws ❑...

  • Page 16: Engine Installation

    enGine inStallation YoU'll neeD The FolloWing PARTS FRoM The KiT: ❑ (4) M3 x 25mm Socket-Cap Screws ❑ (4) M3 Lock Nuts ❑ (8) M3 Flat Washers YoU'll neeD The FolloWing ToolS AnD SUPPlieS: ❑ 2.5mm Hex Wrench ❑ 5/64" (2mm) and 1/8" (3.2mm) Drill Bits ❑...

  • Page 17: Fuel Tank Assembly And Installation

    fuel tank aSSeMBlY and inStallation YoU'll neeD The FolloWing PARTS FRoM The KiT: ❑ (1) 190cc Fuel Tank ❑ (1) Silicone Tubing ❑ (1) Rubber Stopper ❑ (1) Clunk ❑ (2) Aluminum Plates ❑ (1) M3 x 20mm Machine Screw ❑...

  • Page 18: Throttle Control System Installation

    ❑ With the stopper assembly installed, double-check to make sure that the clunk can move freely inside the fuel tank. Ideally, the clunk should be about 1/4" (6mm) in front of the back of the fuel tank. This will ensure that the clunk can't get stuck in the fuel tank during flight.
  • Page 19 ❑ Install the throttle servo into the mounting hole on the right side of the fuselage, making sure to drill 1/16" (1.6mm) diameter pilot holes for the mounting screws. IMPORTANT The servo output shaft should be toward the back of the fuselage.

  • Page 20: Rudder And Elevator Control Systems Installation

    rudder and eleVator Control SYSteMS inStallation YoU'll neeD The FolloWing PARTS FRoM The KiT: ❑ (1) 5-1/4" (133mm) Threaded Wire with 90º Bend ❑ (2) Clevises ❑ (1) 4-7/8" (124mm) Threaded Wire with 90º Bend ❑ (2) Snap-Keepers ❑ (2) Control Horns with Backplates ❑...
  • Page 21 ❑ Push the two servo leads into the servo lead hole, then firmly slide the servo leads through the fuselage and up to the servo lead exit hole. ❑ Carefully pull the servo leads out the servo lead exit hole. Step 2: inStallinG the rudder Control linkaGe aSSeMBlY ❑...
  • Page 22 ❑ Install the 90º bend in the 5-1/4" (133mm) long pushrod wire into the hole that you enlarged, using the nylon snap-keeper provided. When installing the snap-keeper, make sure it "snaps" firmly into place over the pushrod wire. ☞ The pushrod wire should be orientated on top of the servo arm, as shown.

  • Page 23: Aileron Control Systems Installation

    ❑ Install the 90º bend in the 4-7/8" (124mm) long pushrod wire into the outermost hole in a 4-point servo horn, using the nylon snap-keeper provided. ☞ Again, use the same techniques that you used to install the rudder pushrod wire to the servo horn. ❑...
  • Page 24 ❑ Install the aileron servos into the mounting holes, making sure to drill 1/16" (1.6mm) diameter pilot holes for the mounting screws. Run the servo leads into the radio hatch. IMPORTANT The servo output shafts should be toward the back of the wing.

  • Page 25: Final Assembly

    final aSSeMBlY YoU'll neeD The FolloWing PARTS FRoM The KiT: ❑ (1) Plywood Hatch Cover ❑ (1) Decal Set ❑ (4) M2 x 10mm Flange-Head Wood Screws YoU'll neeD The FolloWing ToolS AnD SUPPlieS: ❑ # 1 Phillips Head Screwdriver ❑...

  • Page 26: C/G And Balancing

    ❑ Set the hatch cover into place, then drill 1/16" (1.6mm) diameter pilot holes through the wing, using the predrilled holes in the hatch cover as a guide. IMPORTANT Make sure that the notch you cut in the side of the hatch cover does not pinch the servo leads. ❑...

  • Page 27: Control Throws And Aircraft Setup Information

    Control throWS and airCraft Setup inforMation SettinG the Control throWS We recommend initially setting up the airplane using the Test Flying/Sport Flying control throws. These control throws are suggested for initial test flying and general sport flying because they will allow the airplane to fly smoother and make it easier to control. For 3D flying, use the 3D Flying control throws, but only AFTER you've become very familiar with the flight characteristics of the airplane using the Test Flying/Sport Flying control throws and only after setting up the airplane as described in this section.

  • Page 28: Lateral Balancing

    lateral BalanCinG lateral balancing will make the airplane's controls easier to trim and will make the airplane track straighter in the air. it is strongly recommended. ❑ Turn the airplane upside down and tie one length of string to the propeller shaft and one length of string to the tail wheel wire near the bottom of the fuselage.

  • Page 29: Trim Chart

    triM Chart After you have test-flown and done the initial trim changes to the airplane, use this trimming chart to begin trimming your airplane. Following and adhering to this chart will result in the ability to diagnose trim problems and correct those problems using the simple adjustments shown below.

  • Page 30: Replacement Parts List

    Model Tech's liability exceed the original cost of the purchased kit. In that Model Tech has no control over the final assembly or material used for final assembly, no liability shall be assumed for any damage resulting from the use by the user of the final user-assembled product.

  • Page 31: Product Evaluation Sheet

    Your privacy is important to us. 7) Was any of the assembly difficult for you? If yes, please explain. 1) Kit: Model Tech Sukhoi SU-31 Profile 3D ARF # 123741 ❑ Yes ❑ No...
  • Page 32 _______________________________ _______________________________ Post office will not deliver _______________________________ without proper postage (Return Address Here) Global Hobby Distributors attn: Global Services 18480 Bandilier Circle Fountain Valley CA 92728-8610 fold along dotted line Page ...

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