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Your RC Companion Freewing Mig-21 80mm Build Instructions

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Build Companion:
Freewing Mig-21 80mm
Presented by:
Brad Miser
TM
Your RC Companion
yourrccompanion.com
yourrccompanion@indy.rr.com
Version 1.0

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Summary of Contents for Your RC Companion Freewing Mig-21 80mm

  • Page 1 Build Companion: Freewing Mig-21 80mm Presented by: Brad Miser Your RC Companion yourrccompanion.com yourrccompanion@indy.rr.com Version 1.0...

  • Page 2: Table Of Contents

    Contents Build Companion: Freewing Mig-21 80mm ..............1 Program the Radio ......................4 Prepare the Vertical Stabilizer and Rudder ..............5 Prepare the Rear Fuselage Section, Horizontal Stabilizer, and Elevators ..... 15 Prepare the Rear Fuselage Section, Horizontal Stabilizer, and Elevators: Assemble Horizontal Stabilizers and Configure Elevators ..............
  • Page 3 Install Fuselage and Components .................. 90 Configure the Wires, Receiver, Sensors, and Controllers in the Battery Compartment and Re-install the Battery Tray ............. 99 Prepare for Flight ......................107 Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 4 PayPal to yourrccompanion@indy.rr.com. Communication with the Your RC Companion community is vital to being able to provide the information that will best help people in this hobby. Please send your feedback on this document,...

  • Page 5: Build Companion: Freewing Mig-21 80Mm

    Build Companion: Freewing Mig-21 80mm This build companion provides information about how you can assemble the Freewing Mig-21 80mm and prepare it for flight. The steps in this document are certainly not the only way to assemble the plane, but they will (hopefully at any rate) help you build your plane more easily and faster than relying on just the documentation that comes with the model.
  • Page 6 Note that the locations and types of lights and orientation stripes I added to the plane are done solely for my own preferences and are not aligned with the full-size aircraft, i.e., these are in no way scale modifications. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 2...
  • Page 7 Taranis and want to have the eepe file for this plane that I use as a baseline for yours, send an email to yourrccompanion@indy.rr.com. For a video tour of the completed plane, visit: http://www.youtube.com/watch?v=Hy7gvTCyHr8 Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 3...

  • Page 8: Program The Radio

    • FrSky X8R - 8/16 Channel Receiver • FrSky SP-FLVS - Smart Port Lipo Voltage Sensor • FrSky SP-150A - Smart Port 150 Amp Sensor I purchased these items here: https://alofthobbies.com/radio-gear/frsky-telemetry- system.html Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 4...

  • Page 9: Prepare The Vertical Stabilizer And Rudder

    • Red star decal on left side of vertical stabilizer was partially covering the servo pocket area where the servo arm moves. If you aren’t installing the strobe lights, skip steps 2-21. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 5...
  • Page 10 2. Mark the location of strobe light. I placed mine just below the top section of the vertical stabilizer. I wanted to mount it in the white area so I could use white trim to cover it and the wires. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 6...
  • Page 11 6. Use a hobby knife to cut the channel for the light’s wire. 7. Use a Dremel tool and router bit (and router attachment if you have one) to finalize the light mounting area. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 7...
  • Page 12 8. Test fit the light in the mounting hole until the top of the led base is about even with the surface of the foam. If it isn’t, continue working on the hole until the light fits down into the foam. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 8...
  • Page 13 10. Back on the first side, cut a channel for the wire to run past the servo and create an opening down into the channel through which the rudder servo wire passes. You need to Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 14 12. Solder positive and negative power wires onto each light; if you want to be able to turn Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 15 15. Use the wire puller you inserted earlier to pull the power wire into the channel through which the rudder servo wire runs out the bottom of the stabilizer. 16. Before finalizing the installation, check the lights to make sure they work correctly. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 11...
  • Page 16 17. Glue the lights in position. 18. Route the power wires into the channel you made earlier. 19. Replace the decal over the area from which you removed it. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 12...
  • Page 17 23. Cover the light on the other side in the same way. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 13...
  • Page 18 24. Install the rudder pushrod, center the rudder, attach the keeper on the pushrod, and set the range of rudder movement per the manual. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 14...

  • Page 19: Prepare The Rear Fuselage Section, Horizontal Stabilizer, And Elevators

    Mod Podge glue to protect against scuffs. Quality Issues • Servo arms not centered and no provision for accessing the arm or screw to re-center them. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 15...

  • Page 20: Prepare The Rear Fuselage Section, Horizontal Stabilizer, And Elevators: Assemble

    Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 16...
  • Page 21 5. Repeat the process for the other servo arm if needed. (It was only needed on one of the servos on my model.) 6. Install the control rods for the elevators, center the elevators, and adjust their range of motion per the manual. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 17...

  • Page 22: Prepare The Rear Fuselage Section, Horizontal Stabilizer, And Elevators: Add Orientation Stripes And Protect Stabilizer Tips

    2. Apply orientation stripes to the left horizontal stabilizer and elevator; I used neon yellow because this is a good contrast to the green. 3. Liberally coat the tip of the right horizontal stabilizer and elevator with Mod Podge. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 18...
  • Page 23 4. Do the same for the left side. Once dry, the Mod Podge is virtually invisible and provides a nice shell over the foam. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 19...

  • Page 24: Prepare The Wings

    1. Decide where you will place the light. I placed mine just past the end of the aileron, aligned with one of the panel lines so I could use the panel line to route the light’s wire. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 25 4. Continue working the mounting hole until the light sits down into the wing so that only the led’s base sticks above the foam. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 21...
  • Page 26 6. Continue the channel for the light’s wire around the servo pocket. 7. Once past the servo, widen the existing channel through which the aileron servo’s wire Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 22...
  • Page 27 11. Route the wire the rest of the way to the wing root; leave enough additional wire so it will reach into the receiver location; I made it the same length as the servo wires. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 28 12. Test the light, and if it works, glue it into the wing. Covering the light and wire is described in the section “Prepare the Wings: Cover the Strobe/Wire, Add Orientation Stripes, and Protect the Wing Tips.” 13. Repeat these steps for the other wing. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 24...

  • Page 29: Prepare The Wings: Configure Ailerons And Flaps

    4. Press the clevis onto the ball connector. 5. Install the rod keeper. 6. Repeat steps 1 through 5 for the flap. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 25...
  • Page 30 8. Check the range of motion of the flap to ensure there is no binding and you achieve the range of motion shown in the manual. 9. Repeat these steps for the other wing. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 26...

  • Page 31: Prepare The Wings: Check Retracts And Install Electric Brakes

    If the retract comes loose, re-glue the mount into the wing. If you aren’t going to install electric brakes, repeat steps 1 through 3 on the other wing and skip the rest of the steps in this section. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 27...
  • Page 32 4. Use a 1.5 mm hex wrench to remove the set screw holding the axle in the strut. 5. Remove the stock axle and wheel. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 28...
  • Page 33 It doesn’t look as nice, but is a good tradeoff for me. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 34 I used the same Dremel bit and depth as I did when mounting the strobe lights and it removed the right amount of material. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 30...
  • Page 35 11. Mark the axle where it protrudes from the strut so you can cut off the part of the axle that protrudes from the strut. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 31...
  • Page 36 14. Re-install the wheel on the strut; make sure the flat spot on the axle aligns with the set screw. 15. Re-install the gear door using the two screws you removed earlier. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 32...
  • Page 37 17. Cut a channel for the brake wire just outside of the base of the retract; part of the channel is in the plastic retract mount so you can use a Dremel tool to route that part of the Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 38 19. Retract the landing gear and make sure the brake wire is not getting pinched by the gear door and that the wire isn’t preventing the retract and gear door from retracting properly. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 39 (brake and strobe light) in the existing channel without widening it. 21. Repeat these steps to test the retract and install the wheel and brake on the other wing. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 35...

  • Page 40: Tips

    1. Cut a piece of tape or trim to cover the strobe light; I used a piece of painted tape I had from another plane that was a reasonable match to the grey (not exact, but close enough). 2. Apply the tape or trim over the strobe light. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 36...
  • Page 41 4. Apply orientation stripes to the outer part of the wing. (Note: I’m not using the external wing tanks that are included with the model so I covered over the tank mounting slot on the wing.) Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 37...
  • Page 42 5. If the tape or trim you used for orientation stripes doesn’t cover the wing tip, apply Mod Podge to the tip to protect it from scuffing. 6. Repeat these steps for the other wing. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 38...

  • Page 43: Prepare The Front Fuselage Section

    6S or larger pack. Additionally, I use FrSky telemetry for current and battery pack voltage; these steps show how the associated sensors can be installed. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 39...
  • Page 44 2. Slide the current sensor over the positive power wire ensuring the direction arrow on the sensor points toward the ESC. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 40...
  • Page 45 3. Slide the current sensor back into the fuselage to keep it out of the way (you will mount it in later steps). 4. If you installed electric brakes, connect the positive power wire from the brake controller to the positive power wire from the ESC. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 41...
  • Page 46 5. Install the connector on the positive wire from the ESC and the brake controller. 6. Install the plastic shell on the positive wire from the ESC. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 42...
  • Page 47 This completes the ESC side of the power supply lines. 8. Cut the stock EC-5 connectors from the battery side of the power leads. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 43...
  • Page 48 (adding the anti-spark connector increases the length of the positive wire). 14. Install connectors on the negative side and attach the plastic shells on both ends by sliding them together. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 44...
  • Page 49 18. Connect the voltage sensor to the smart port on the receiver. 19. Install a balance lead extension to the voltage sensor (this makes it easier to connect the balance lead from the battery pack to the sensor). Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 45...

  • Page 50: Receiver

    1. Remove the two screws holding the battery tray in the plane. 2. Remove the tray from the plane to expose the area where you will route the wires coming from the rear of the fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 46...

  • Page 51: Prepare The Front Fuselage Section: Test Edf And Telemetry And Calibrate The Throttle

    Prepare the Front Fuselage Section: Test EDF and Telemetry and Calibrate the Throttle Check the function of the power system, confirm telemetry is working (if installed), and calibrate the throttle as follows: Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 47...
  • Page 52 (6 if you are using a 6S pack). 4. Connect the voltage telemetry (if installed) to the battery. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 48...
  • Page 53 (such as current and voltage). 8. Disconnect the battery pack and power down the transmitter. 9. Power up the transmitter and put the throttle in the maximum power position. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 49...

  • Page 54: Prepare The Front Fuselage Section: Install Stobe Lights

    I added a white strobe light to the top of the fuselage behind the latch for the canopy; this light is set to a slow pulse mode. I added a two-light set to the bottom of the fuselage just behind the nose gear wheel well. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 50...
  • Page 55 3. Use a hobby knife to rough cut the opening for the light. I use the knife to trace the outline of the light and then make sections across the area. I then hold the knife horizontally to cut out the sections. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 51...
  • Page 56 5. Install a router bit on a Dremel tool and attach the router attachment if you have one. Set the depth so that it the led on the light will project above the top of the fuselage while the circuit board is below it. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 52...
  • Page 57 6. Use the Dremel to deepen the hole so the light fits into it properly. 7. Test fit the light into the mounting position. 8. Repeat steps 6 and 7 until the light fits properly. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 53...
  • Page 58 10. Solder the wire on the light. I apply a small amount of liquid electrical tape over the soldered area and wires to protect the area and give the connections additional strength. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 59 14. Prepare a covering for the light. I used a piece of black trim sheet, cut to approximately 1.5 in x 2 in. I used a paper hole punch to create the opening for the light. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 60 16. Repeat steps 1 through 15 to mount the light on the bottom of the fuselage. I installed a double light with a white strobe and a solid red light just behind the nose gear wheel well. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...

  • Page 61: Prepare The Front Fuselage Section: Install Landing Lights

    (which doesn’t bother me, but it does add some additional non-scale appearance). 1. Gather the landing lights; I used two. 2. Determine where you will mount the lights. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 57...
  • Page 62 Dremel routing bit to finish it. 4. Test fit the light and continue to work on the mounting hole until the light fits properly. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 63 6. Cut an opening in the plastic wheel well cover through which you can pass the light’s wire. 7. Route the wire into the wheel well and into the battery compartment. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 59...
  • Page 64 10. If the lights work properly and are where you want them to be, glue them in place; make sure you glue the tab in the mounting hole and the light case to the fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 65 11. Use tape to secure the light wires to the inside of the wheel well so they don’t interfere with the nose gear. 12. Raise the nose gear and make sure the light wires don’t interfere with its operation. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 61...

  • Page 66: Join The Rear Fuselage Section To The Front Fuselage Section

    1. Test fit the rear fuselage section onto the front section to ensure the two parts fit together evenly and that they align correctly. If not, sand the front end of the rear section until they fit correctly. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 62...
  • Page 67 3. Glue the rear section of the fuselage onto the front section and let it dry. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 63...
  • Page 68 4. Insert the wire puller provided with the plane through the channel at the top of the fuselage. 5. Attach one of the servo wires to the wire puller. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 64...
  • Page 69 6. Pull the wire puller and servo wire to the front of the fuselage. 7. Repeat steps 5 and 6 to bring the other servo wire into the front of the fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 70 9. Test the elevators to make sure they work properly (if you configured the elevators as described in an earlier section, there shouldn’t be any problems, but it is a good idea to check them here too just in case). Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 66...
  • Page 71 10. Put some tape over the elevator servo wires so they remain in the channel at the top of the fuselage. This will prevent the wires from interfering with the installation of the vertical stabilizer. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 67...

  • Page 72: Install The Vertical Stabilizer

    . 2. Put the connector on the rudder servo wire into the loop on the wire puller. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 68...
  • Page 73 4. If you installed strobe lights on the vertical stabilizer, use the wire puller to pull the strobe light wire into the battery compartment. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 69...
  • Page 74 6. Seat the vertical stabilizer all the down in its mount so the holes for the screws in the mounting tabs on the fuselage align with the holes in the vertical stabilizer. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 75 7. Plug the rudder servo wire into the blue junction box. 8. Test the rudder to make sure it works correctly. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 71...
  • Page 76 9. Secure the vertical stabilizer in place with four screws (two on each side). Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 72...

  • Page 77: Install The Wings

    If I were to build another of these models or if I ever need to do maintenance in this area, I’ll remove the louver and use Air-Jon’s technique of mounting it. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 73...
  • Page 78 I used an alternate method by removing the EDF access cover and EDF instead. 1. Remove the two screws holding the EDF access cover on. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 74...
  • Page 79 Later in this process, I needed to move the EDF completely out of the way and ended up Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 80 7. Fold the wires from the wing back on the bottom of the wing to keep them out of the way while being easy to access for routing. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 76...
  • Page 81 11. Pull the wire puller so you can easily access the loop. You can move the EDF out of the way as needed to reach into the fuselage and grab the end of the puller to pull it back. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 82 14. Place the connector from the wing’s wire onto the wire puller. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 78...
  • Page 83 17. Repeat steps 9 through 16 until you have pulled all of the wires from the wing to the front of the fuselage; you should have wires for the aileron, flap, landing gear, brake (if Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 84 19. Locate two screws you use to secure the wing to the fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 80...
  • Page 85 21. Repeat steps 7 through 20 to install the other wing, being careful to route all its wires to the front of the fuselage and to ensure wires are not pinched between the wing and fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 81...
  • Page 86 23. Test the function of the ailerons, flaps, retracts, and brakes. Correct any issues you find (if you followed previous steps and configured all these items before installing the wings, there shouldn’t be any problems). Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 82...
  • Page 87 4.) 25. Check to see if you will be able to glue the clear plastic channel cover over the channel to Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 83...
  • Page 88 Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 89 Then, I used the wood to press the tape down to make sure it was firmly attached and ran over all the edges to ensure that were no edges that might get lifted up by the airflow. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 85...
  • Page 90 30. Repeat steps 24 through 29 for the other side. In this case, I just used tape and left the Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 91 31. If you completely removed the EDF, reconnect it to the ESC, ensuring the connections are the same as before you removed it. 32. Use the four screws to re-install the EDF. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 87...
  • Page 92 Covering the cheater hole with mesh helps reduce Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 93 36. When the size of the mesh is correct, tape it in place. Try to keep the tape on the plastic louver as much as possible instead of putting tape on the foam. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 94 3. On my model, the rear slot was too tight so I use a flat head screwdriver to widen the slot slightly until the rear of the fin would fit into it. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 95 4. Continue working the fin into the two slots until it won’t go any further. 5. Use a screw to attach the fin to the plastic mount point. 6. Locate the two wing fences. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 91...
  • Page 96 8. Line up the notch on the fence with the corresponding tab in the slot on the wing, place a little glue on the wing fence, and insert it into the slot. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 97 9. Repeat steps 7 and 8 to mount the fence on the other wing. 10. Locate the plastic piece that mounts right behind the latch for the cockpit. 11. Glue the plastic part into the slot on top of the fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 93...
  • Page 98 12. Locate the silver antenna. 13. Locate the antenna mounting slot on the right side of the model, just above the numbers on the side of the fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 94...
  • Page 99 I didn’t glue it. Also, I wanted to be able to remove the assembly as I might take if off when I transport the plane because it sticks out so far, it will make transportation more difficult and will likely get broken off. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 95...
  • Page 100 18. Insert the rod sticking out of the base of the nose cone into the hole in the center of the fuselage; I put a small amount of glue on the rod and used a screwing motion to get the nose cone installed all the way. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 96...
  • Page 101 20. Use a sharp hobby knife to cut a slit into the fin mounting area on the fuselage; the slit can be very narrow because the fins are thin plastic. The slit needs to be deep enough so the fin fits all the way against the fuselage. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 97...
  • Page 102 21. Test fit the fin into the slot. If it doesn’t fit all the way against the fuselage, continue expanding the slit until it does. Then, glue the fin in place. 22. Repeat steps 20 and 21 to install the fin on the other side. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 98...
  • Page 103 Quality Issues • None 1. With all the components in the battery compartment, start planning your attack. I started at the rear of the compartment, but either direction works. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 99...
  • Page 104 3. I mounted the current sensor on the side of the fuselage using double-sided tape; I placed it far enough back that it wouldn’t interfere with moving the battery back as far as needed Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 105 6. I mounted the landing light controller at the front of the compartment on the shelf above the nose gear. The controller doesn’t interfere with the tongue on the canopy in this Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 106 11. I put tape over the channel where the cut outs for the battery strap are. This keeps the wires in the channel making installation of the battery tray easier and gives the battery Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 107 14. Test fit a battery on the tray to make sure you can get it in and out easily and that the wires at the rear of the tray don’t interfere with pushing the battery back. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...
  • Page 108 16. I installed self-adhesive silicon onto the tray to keep the battery from slipping (instead of using the anti-slip material provided with the model). 17. Re-install the battery tray. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 104...
  • Page 109 19. Install the voltage sensor; I used double-sided tape to mount it to the inner fuselage wall. 20. Secure the receiver’s antennas. I mounted one vertically on one side and horizontally on the other side. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 105...
  • Page 110 22. Install a battery and connect it to the ESC and sensors. Make sure nothing interferes with the battery going in or coming out. Also, make sure you can move the battery toward the front or rear to adjust cg. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 106...
  • Page 111 After you fly the plane, you can further adjust the battery location or add weight to put the cg where you want it to be. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser Page 107...
  • Page 112 I usually do the initial takeoff with the middle flight mode and adjust from there as needed. The model should be ready to fly. Build Companion: Freewing Mig-21 80mm Copyright 2016 by Brad Miser...

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