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  5. Instructions For Final Assembly

Modeltech 123752 Instructions For Final Assembly

Summary of 123752

  • Page 1

    1 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: 4c...

  • Page 2

    2 table of contents 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 flig...

  • Page 3

    3 thank you for purchasing the new modeltech fun fly 90s arf. Before completing the final assembly of your new airplane, please carefully read through this instruction manual in its entirety. Doing so will ensure your success the first time around! Modeltech fun fly 90s arf features ● pre-built from...

  • Page 4

    4 what radio system and servos should i use? For typical sport-flying and general aerobatics, a standard four channel radio system will be more than adequate. Since the ailerons use separate aileron servos, you will need to use a servo y-harness to join them. The fun fly 90s arf is a big airplane wi...

  • Page 5

    5 ❑ kwik bond thin c/a # 887500 ❑ kwik bond thick c/a # 887510 ❑ kwik bond 30 minute epoxy # 887565 ❑ kwik bond c/a debonder # 887545 ❑ pacer z-42 threadlocker # 339162 ❑ # 1 & # 2 phillips head screwdrivers ❑ 3mm hex wrench ❑ adjustable open-end wrench ❑ wire cutters ❑ needle nose pliers ❑ excel mo...

  • Page 6

    6 kit contents, continued.... Main landing gear assembly ❑ (1) prebent aluminum main gear strut ❑ (2) main gear wheels ❑ (3) m3 x 12mm machine screws ❑ (3) m3 flat washers ❑ (2) m4 x 35mm smooth-shank machine screws ❑ (6) m4 flat washers ❑ (4) m4 lock nuts ❑ (2) 21-1/4" threaded wires w/90º bend ❑ (...

  • Page 7

    7 global stocks a complete line of replacement parts for your modeltech fun fly 90s arf. Listed below are the replacement parts that are available along with their respective part numbers for easy ordering convenience. We suggest ordering directly from your local dealer. If your dealer does not stoc...

  • Page 8

    8 ❑ kwik bond thick c/a ❑ kwik bond 30 minute epoxy ❑ kwik bond c/a debonder ❑ excel modeling knife ❑ electric drill ❑ 11/64" drill bit ❑ ruler ❑ (1) right wing panel w/aileron ❑ (1) left wing panel w/aileron ❑ (1) hardwood wing joiner ❑ (1) plywood wing-screw doubler ❑ pencil ❑ 220 grit sandpaper w...

  • Page 9

    9 ❑ while holding the two wing panels together firmly, make sure that both wing panels are lined up at both the leading and the trailing edges, then look carefully at the center-section joint: the wing panels should fit together tightly with few or no gaps in the joint. ☞ if the wing panels do not f...

  • Page 10

    10 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...

  • Page 11

    11 ❑ 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. ❑ align the holes in the wing with the preinstalled blind n...

  • Page 12

    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. ❑ when you are satisfied that the stab...

  • Page 13

    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 o...

  • Page 14

    14 ❑ kwik bond thin c/a ❑ kwik bond c/a debonder ❑ excel modeling knife ❑ (17) c/a style hinges ❑ dubro t-pins ❑ paper towels you'll need the following parts from the kit: you'll need the following tools and supplies: section 9: hinging the control surfaces step 1: hinging the ailerons ❑ push two t-...

  • Page 15

    15 step 2: hinging the elevator halves & the rudder 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 ...

  • Page 16

    16 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. ☞ the clasp...

  • Page 17

    17 step 1: installing the main gear strut ❑ install the main gear strut to the bottom of the fuselage, using three m3 x 12mm machine screws and three m3 flat washers. ☞ blind nuts have been preinstalled in the bottom of the main gear mounting block for the machine screws. ✦ ✦ ✦ ✦ ✦important✦ ✦ ✦ ✦ ✦...

  • Page 18

    18 ❑ pacer z-42 threadlocker ❑ 3mm hex wrench ❑ adjustable open-end wrench ❑ electric drill ❑ (2) engine mounting beams ❑ (4) m4 x 16mm socket-cap screws ❑ (4) m4 x 25mm socket-cap screws ❑ (4) m4 lock nuts ❑ (12) m4 flat washers ❑ 3/32" & 11/64" drill bits ❑ ruler ❑ pencil you'll need the following...

  • Page 19

    19 ❑ 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. ❑ # 1 phillips head screwdriver ❑ excel modeling knife ❑ scissors ❑ (1) 320cc fuel tank ❑ (1) large diameter metal...

  • Page 20

    20 ❑ push the m3 x 20mm machine screw through the stopper assembly, from the front, and partially thread it into the small diameter metal backplate. ❑ 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, ...

  • Page 21

    21 ❑ 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. ☞ make sure that the foam rub...

  • Page 22

    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 i...

  • Page 23

    23 ❑ kwik bond thin c/a ❑ # 1 phillips head screwdriver ❑ wire cutters ❑ needle nose pliers ❑ excel modeling knife ❑ electric drill ❑ (1) 18-1/2" threaded wire w/90º bend ❑ (1) 17-1/2" threaded wire w/plain end ❑ (2) nylon control horns w/backplates (small) ❑ (4) m2 x 16mm machine screws ❑ (2) nylon...

  • Page 24

    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...

  • Page 25

    25 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,...

  • Page 26

    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 pu...

  • Page 27

    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 ...

  • Page 28

    28 ❑ kwik bond thin c/a ❑ # 1 phillips head screwdriver ❑ wire cutters ❑ needle nose pliers ❑ excel modeling knife ❑ (2) 3-7/8" threaded wires w/z-bend ❑ (2) nylon control horns w/backplates (small) you'll need the following parts from the kit: you'll need the following tools and supplies: section 1...

  • Page 29

    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 ...

  • Page 30

    30 ❑ adjustable open-end wrench ❑ excel modeling knife ❑ scissors ❑ electric drill you'll need the following tools and supplies: section 18: final assembly ❑ 5/64" drill bit ❑ masking tape ❑ paper towels ❑ rubbing alcohol step 1: installing your engine accessories ❑ install your muffler onto your en...

  • Page 31

    31 ❑ ruler ❑ masking tape you'll need the following tools and supplies: section 19: balancing the fun fly 90s arf ✦ ✦ ✦ ✦ ✦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/...

  • Page 32

    32 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 airpl...

  • Page 33

    33 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. ✦ ✦ ✦ ✦ ✦important✦ ✦ ✦ ✦ ✦ the aileron cont...

  • Page 34

    34 flaperon and spoileron mixing: plugging the servos separately into the receiver (one into channel 1 and one into channel 6) will allow the use of flaperons (both ailerons down at the same time) and spoilerons (both ailerons up at the same time). These functions can then be mixed with the elevator...

  • Page 35

    35 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...

  • Page 36

    36 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 f...

  • Page 37

    37 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. Maki...

  • Page 38

    38.

  • Page 39

    39 telling us what you like and don't like determines what model kits we make and how we make them. We would appreciate it if you would take a few minutes of your time to answer the following questions about this kit and your modeling interests. Simply fold this form on the dotted lines, seal with t...

  • Page 40

    40 fold along dotted line fold along dotted line global hobby distributors attn: global services 18480 bandilier circle fountain valley ca 92728-8610 post office will not deliver without proper postage _____________________________ _____________________________ _____________________________ (return ...