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Modeltech FUN FLY90S Instructions For Final Assembly

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INSTRUCTIONS FOR FINAL ASSEMBLY
The Modeltech Fun Fly 90S ARF is distributed
exclusively by Global Hobby Distributors
18480 Bandilier Circle, Fountain Valley, CA 92708
All contents copyright © 2004, Global Hobby
Distributors Version V1.0 February 2004
Kit Product Number 123752
IMPORTANT
The Modeltech Fun Fly 90S ARF is not intended for inexperienced pilots. It is in no way a trainer. If
you are not comfortable flying large aerobatic sport aircraft, we strongly suggest returning the Fun Fly 90S ARF (brand
new, in the box with all original packaging and your dated sales receipt) to the place of purchase.
Specifications:
Wing Span: 61 Inches
Wing Area: 1100 Square Inches
Length: 58 Inches
Weight RTF: 6.75 - 7.25 Pounds
Wing Loading: 14.25 - 15.25 Ounces Per Square Foot
Functions: Ailerons, Elevator, Rudder & Throttle
Engine Required: .60 - .91 Small Block 2-Stroke
Radio Required: 4Ch or More w/5 Servos
The Fun Fly 90S ARF Requires 4 High-Torque Servos for the
Control Surfaces and 1 Standard Servo for the Throttle
1

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Summary of Contents for Modeltech FUN FLY90S

  • Page 1 IMPORTANT The Modeltech Fun Fly 90S ARF is not intended for inexperienced pilots. It is in no way a trainer. If you are not comfortable flying large aerobatic sport aircraft, we strongly suggest returning the Fun Fly 90S ARF (brand...

  • Page 2: Table Of Contents

    OUR GUARANTEE Modeltech guarantees this kit to be free from defects in both material and workmanship at the date of purchase. This does not cover any component parts damaged by use, misuse or modification. In no case shall Modeltech's liability exceed the original cost of the purchased kit.

  • Page 3: Introduction

    Modeltech product owners and the Modeltech support staff. This is a great place to learn about new Modeltech products, get help and suggestions for your current Modeltech products or just simply hang out and chat with people that share your same interests.

  • Page 4: Section 1: Our Recommendations

    This section describes our recommendations to help you in deciding which types of accessories to purchase for your new Modeltech Fun Fly 90S ARF. Please read through this entire section very carefully. We have provided you with tips and recommendations that, if followed, will result in a great flying airplane. Failure to follow our recommendations may result in a poor flying airplane.

  • Page 5: Section 2: Tools And Supplies Required

    SECTION 2: TOOLS AND SUPPLIES REQUIRED The tools and supplies listed below will be necessary to finish the assembly of your Fun Fly 90S ARF. We suggest having these items on hand before beginning assembly. Kwik Bond Thin C/A # 887500 Assorted Drill Bits Kwik Bond Thick C/A # 887510 Dubro T-Pins # 567685...

  • Page 6: Section 4: Metric Conversion Chart

    KIT CONTENTS, CONTINUED..MAIN LANDING GEAR ASSEMBLY RUDDER CONTROL SYSTEM (1) Prebent Aluminum Main Gear Strut (2) 21-1/4" Threaded Wires w/90º Bend (2) Main Gear Wheels (2) Nylon Control Horns (Large) (3) M3 x 12mm Machine Screws (2) M2 x 16mm Machine Screws (3) M3 Flat Washers (2) M2 Hex Nuts (2) M4 x 35mm Smooth-Shank Machine Screws...

  • Page 7: Section 5: Replacement Parts

    We suggest ordering directly from your local dealer. If your dealer does not stock Modeltech products, you can order directly from us at the address shown below:...

  • Page 8: Section 7: Wing Assembly

    SECTION 7: WING ASSEMBLY YOU'LL NEED THE FOLLOWING PARTS FROM THE KIT: (1) Right Wing Panel w/Aileron (1) Hardwood Wing Joiner (1) Plywood Wing-Screw Doubler (1) Left Wing Panel w/Aileron YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES: Kwik Bond Thick C/A Pencil 220 Grit Sandpaper w/Sanding Block Kwik Bond 30 Minute Epoxy...
  • Page 9 Carefully slide both wing panels together with the wing joiner temporarily installed (without using glue). IMPORTANT When the wing joiner is installed, it should not fit tightly into the wing panels. It should actually be slightly loose. This will ensure that when you glue the wing joiner into place that epoxy can get into the joints between the wing joiner and the joiner box.

  • Page 10: Section 8: Stabilizer Installation

    STEP 3: CHECKING THE WING CENTER-SECTION JOINT Once the epoxy has fully cured, remove the masking tape and double-check the center-section joint. If any gaps are present, mix a small quantity of 30 minute epoxy and carefully fill any remaining gaps. Quickly remove any excess epoxy using a paper towel and rubbing alcohol, and allow the epoxy to thoroughly cure.
  • Page 11 Using a modeling knife, cut away and remove the covering material from over the horizontal and vertical stabilizer mounting slots in the back of the fuselage. Place the wing into the wing saddle, push it forward completely, then push the trailing edge down into place. Two holes have been predrilled in the forward bulkhead to accept the wing hold-down dowels in the leading edge of the wing.
  • Page 12 Use a ruler to carefully measure the distance between the tips of the stabilizer and the tips of the wing. Pivot the front of the stabilizer until both of these measurements are equal. When both measurements are equal, the stabilizer is square to the wing.
  • Page 13 Mix a generous amount of 30 minute epoxy and carefully apply a thin layer to the top and bottom of the gluing surfaces of the stabilizer, and to the gluing surfaces of the stabilizer mounting slot. Slide the stabilizer back into place and realign it, double-checking all of your measurements once more before the epoxy sets up.

  • Page 14: Section 9: Hinging The Control Surfaces

    SECTION 9: HINGING THE CONTROL SURFACES YOU'LL NEED THE FOLLOWING PARTS FROM THE KIT: (17) C/A Style Hinges YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES: Kwik Bond Thin C/A Dubro T-Pins Kwik Bond C/A Debonder Paper Towels Excel Modeling Knife STEP 1: HINGING THE AILERONS WARNING For flutter-free control surfaces, it is imperative that the hinges be glued in properly.

  • Page 15: Section 10: Tail Wheel Installation

    PRO TIP After the C/A has fully cured, gently grasp the aileron and wing and pull on the aileron like you are trying to pull out the hinges. The hinges should hold securely. If one or more hinges feels loose, apply more C/A to the hinge(s) and allow it to completely cure.

  • Page 16: Section 11: Main Landing Gear Installation

    STEP 2: INSTALLING THE TAIL WHEEL BRACKET Set the tail wheel bracket into place on the bottom of the fuselage. To align the bracket assembly, the pivot point of the tiller arm should be even with the rudder hinge line and the bracket should be centered on the bottom of the fuselage.
  • Page 17 STEP 1: INSTALLING THE MAIN GEAR STRUT Using a modeling knife, cut away and remove the covering material from over the three predrilled main gear strut mounting holes in the bottom of the fuselage. Use the preinstalled blind nuts inside the fuselage as reference to locate the holes.

  • Page 18: Section 12: Engine Installation

    SECTION 12: ENGINE INSTALLATION YOU'LL NEED THE FOLLOWING PARTS FROM THE KIT: (4) M4 Lock Nuts (2) Engine Mounting Beams (12) M4 Flat Washers (4) M4 x 16mm Socket-Cap Screws (4) M4 x 25mm Socket-Cap Screws YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES: Pacer Z-42 Threadlocker 3/32"...

  • Page 19: Section 13: Fuel Tank Assembly & Installation

    Carefully enlarge the 3/32" diameter pilot holes using an 11/64" diameter drill bit. Install the engine using four M4 x 25mm socket-cap screws, eight M4 flat washers and four M4 lock nuts. Tighten the screws and nuts firmly to hold the engine securely into place.
  • Page 20 Secure one end of the silicon fuel tubing onto the end of the fuel pick-up "clunk." Slide the silicon fuel tubing, with the fuel pick-up attached, onto the end of the aluminum fuel pick-up tube (straight tube). While holding the aluminum tube in place, adjust the length of the silicon tubing until the fuel pick-up is 4-3/8"...

  • Page 21: Section 14: Throttle Control System Installation

    To secure the fuel tank assembly into place, cut and install several pieces of foam rubber between the bottom of the fuel tank and the top of the fuel tank support platform, and between the top and sides of the fuel tank and the top and sides of the front bulkhead.
  • Page 22 Slide the plain end of the throttle pushrod wire through the predrilled hole in the firewall, then through the predrilled hole in the forward bulkhead. Reinstall the throttle arm onto your engine. IMPORTANT So that the pushrod wire doesn't bind, you may need to make a bend in the pushrod wire so that it lines up better with your engine's throttle arm.

  • Page 23: Section 15: Elevator Control System Installation

    SECTION 15: ELEVATOR CONTROL SYSTEM INSTALLATION YOU'LL NEED THE FOLLOWING PARTS FROM THE KIT: (1) 18-1/2" Threaded Wire w/90º Bend (2) Nylon Clevises (1) Nylon 90º Snap Keeper (1) 17-1/2" Threaded Wire w/Plain End (2) Nylon Control Horns w/Backplates (Small) (2) Wheel Collars w/Set Screws (4) M2 x 16mm Machine Screws YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES:...
  • Page 24 Partially thread one machine screw into each of the two steel collars, then slide the steel collars onto the threaded elevator pushrod wire and up against the nylon snap keeper. Make a shallow bend 1-1/2" from the plain end of the 17-1/2" long pushrod wire, then slide the pushrod wire through the steel collars, as shown.

  • Page 25: Section 16: Rudder Control System Installation

    PRO TIP Before installing the control horn in the next procedure, drip several drops of thin C/A into the pilot holes and allow the C/A to fully cure. The C/A will harden the surrounding balsa, making the mounting area stronger. Install the control horn and backplate using two M2 x 16mm machine screws, being careful not to overtighten them.
  • Page 26 Install the rudder servo onto the hardwood mounting rails in front of the elevator servo, as shown. Again, make sure to drill 1/16" diameter pilot holes for the mounting screws. IMPORTANT The rudder servo should be centered so that the servo arm will line up with the rudder pushrod housings.
  • Page 27 STEP 3: INSTALLING THE CONTROL HORNS & CLEVISES Position one nylon control horn (large) onto the side of the rudder. When aligned properly, the centerline of the control horn should be even with the rudder pushrod wire and the clevis attachment holes should be lined up over the hinge line. The base of the control horn should be parallel to the rudder hinge line, too.

  • Page 28: Section 17: Aileron Control System Installation

    SECTION 17: AILERON CONTROL SYSTEM INSTALLATION YOU'LL NEED THE FOLLOWING PARTS FROM THE KIT: (4) M2 x 20mm Machine Screws (2) 3-7/8" Threaded Wires w/Z-Bend (2) Nylon Control Horns w/Backplates (Small) (2) Nylon Clevises YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES: Kwik Bond Thin C/A Electric Drill # 1 Phillips Head Screwdriver...
  • Page 29 STEP 3: INSTALLING THE CONTROL HORNS & CLEVISES Position one nylon control horn (small) onto the bottom of one aileron. When aligned properly, the centerline of the control horn should be directly behind the aileron pushrod wire and the clevis attachment holes should be lined up over the hinge line.

  • Page 30: Section 18: Final Assembly

    SECTION 18: FINAL ASSEMBLY YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES: Adjustable Open-End Wrench 5/64" Drill Bit Excel Modeling Knife Masking Tape Scissors Paper Towels Electric Drill Rubbing Alcohol STEP 1: INSTALLING YOUR ENGINE ACCESSORIES Install your muffler onto your engine, then cut to length and connect the fuel lines to the carburetor and muffler pressure tap.

  • Page 31: Section 19: Balancing The Fun Fly 90S Arf

    SECTION 19: BALANCING THE FUN FLY 90S ARF YOU'LL NEED THE FOLLOWING TOOLS AND SUPPLIES: Ruler Masking Tape IMPORTANT It is critical that your airplane be balanced correctly. Improper balance will cause your airplane to lose control and crash! Center of Gravity Location: 4-3/4"...

  • Page 32: Section 21: Aircraft Setup Information

    SECTION 21: AIRCRAFT SETUP INFORMATION Before adjusting the control throws and flying your new Fun Fly 90S ARF, there are some points about the airplane's setup that you should be aware of. If you're a veteran of high-performance airplanes, you've probably heard this information before but, if this is your first high-performance airplane, this information will be very important to you.

  • Page 33: Section 22: Control Throws

    SECTION 22: CONTROL THROWS We recommend setting up the Fun Fly 90S ARF using the control throws listed below. These control throws are suggested for initial test-flying because they will allow the airplane to fly smoother and make it easier to control. TEST-FLYING Ailerons: 1"...

  • Page 34: Section 23: Computer Radio Setup

    SECTION 23: COMPUTER RADIO SETUP Although you don't have to use a computer radio to enjoy the flying qualities of the Fun Fly 90S ARF, if you're planning on doing extreme 3D aerobatics, it is recommended. Before making any adjustments, please read and understand your radio's setup manual.

  • Page 35: Section 24: Preflight Check & Safety

    SECTION 24: PREFLIGHT CHECK & SAFETY WARNING ABOUT THROTTLE MANAGEMENT It is very important that you understand throttle management. In a nutshell, this means no full throttle dives. Full throttle dives should be avoided so as not to cause control surface flutter and/or airframe failure. When the nose of the airplane drops, decrease the throttle, just as in full-scale aerobatics.

  • Page 36: Section 25: Flying The Fun Fly 90S Arf

    SECTION 25: FLYING THE FUN FLY 90S ARF The Fun Fly 90S ARF is designed for those pilots who are experienced at flying sport models. It is not a trainer. If you do not feel comfortable about test-flying the airplane, don't hesitate to ask someone more experienced for help. When set up for test-flying, the Fun Fly 90S ARF is much like flying any other sport aerobatic airplane.

  • Page 37: Section 26: Fun Fly 90S Flight-Trimming Chart

    SECTION 26: FUN FLY 90S ARF FLIGHT-TRIMMING 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 39: Product Evaluation Sheet

    Global Hobby Distributors will not disclose the information it collects to outside parties. Global Hobby Distributors does not sell, trade, or rent your personal information to others. Your privacy is important to us. Kit: Modeltech Fun Fly 90S ARF # 123752 Was any of the assembly difficult for you? If yes, please explain.
  • Page 40 _____________________________ _____________________________ 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...

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