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Fei Bao MiG-21 Fishbed Instruction Manual
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Fei Bao MiG-21 Fishbed Instruction Manual

1/5.5 scale
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Fei Bao Jets
(Photos by Joseph Balabon)
1/5.5 Scale Mig-21 Fishbed (J)
Specifications:
Length: 98-1/2" (2500 mm)
Wingspan: 55-1/4" (1400 mm)
Weight: 24lbs (10.9 Kg) empty
Thrust Class: 20 – 28 lbs (9 – 12 Kg)
Radio: Minimum 7 channels
Written by Jim McEwen
In collaboration with RC Jet Models
Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0)
Page 1 of 24

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Summary of Contents for Fei Bao MiG-21 Fishbed

  • Page 1 Weight: 24lbs (10.9 Kg) empty Thrust Class: 20 – 28 lbs (9 – 12 Kg) Radio: Minimum 7 channels Written by Jim McEwen In collaboration with RC Jet Models Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 1 of 24...

  • Page 2: Before You Begin

    So pause every once in a while when building it and double-check your workmanship. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 2 of 24...
  • Page 3 One cartridge is plenty to assemble your MiG-21 Fishbed. Using Pneumatic Systems The Fei Bao MiG-21 Fishbed uses pneumatic brakes and retracts. If you follow a few tips, you should have very reliable, leak-free operation. Neatness counts. All airlines should be secured to the airframe to keep them from flopping around or getting kinked.

  • Page 4: Additional Items Required

    Solution #2 Proportional brake valve (Ultra Precision UP-6 or BVM Smooth-Stop) & JR341 servo or equivalent Solution #3 Jet-Tronics Low Loss electronic brake valve Airbrakes Solution #1 Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 4 of 24...
  • Page 5 Sandpaper (course and fine grades) Pliers Side cutters Double-sided tape Jewelers files (various shapes) Thread locker (blue) Dremel tool and assorted bits Phillips screwdriver Various balsa and hardwood stock (servo rails) Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 5 of 24...
  • Page 6 Final adjustment of the pushrod, centering the rudder, and installation of the servo cover will be done when setting up the control throws. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 6 of 24...
  • Page 7 Connect the flap control horn to the servo arm using the provided hardware or the builder’s preferred hardware. Final adjustment of the pushrod, centering the flap, and installation of the servo cover will be done when setting up the control throws. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 7 of 24...
  • Page 8 Connect the aileron control horn to the servo arm using the provided hardware or the builder’s preferred hardware. Final adjustment of the pushrod, centering the aileron, and installation of the servo cover will be done when setting up the control throws. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 8 of 24...
  • Page 9 Tygon tubing was used as an extension for the vent line since it tends to stiffen with long-term exposure to kero. All connections are secured with safety wire. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 9 of 24...
  • Page 10 Tip: Mark the exterior of the tank with an F (fuel) or V (vent) to help prevent connection errors when installing the fuel lines to the tanks. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 10 of 24...
  • Page 11 Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 11 of 24...
  • Page 12 Due to manufacturing tolerances installing the axle in the stab and the bulkhead in the fuselage, the stab root chord may not perfectly match the fuselage. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 12 of 24...
  • Page 13 Cut away the vertical face of the notch at the fuselage root as shown below to allow the H-stab to rotate. This area is covered by the stab so it's not visible when the stabs are at neutral. Horizontal Stabs - Servo/Pushrod Install Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 13 of 24...
  • Page 14 Hysol and 3/4" balsa triangle stock. Grind the edges of the H-stab trunnion blocks as necessary to match the curvature of the opening in the bulkhead for the exhaust duct. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 14 of 24...
  • Page 15 (made by putting a 90 degree bend in a Dubro Ball Link Release Tool and gluing it to a strip of hardwood) made it easy to pull the Safety over the fitting. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 15 of 24...
  • Page 16 Two pieces of plywood can be installed between the forward air brakes to create a trough that will assist in retaining the bundle of air lines between the speed brakes. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 16 of 24...
  • Page 17 The aileron and flap servo wires are routed from the cutout in the wing root forward over the cutout for the gear strut. This area can become easily congested as several pneumatic lines Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 17 of 24...
  • Page 18 Two exhaust duct mounts are spot-welded to near the front of the exterior duct. Mark the location where they intersect the fuselage bulkhead and bend each mount 90 degrees. Cut off Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 18 of 24...
  • Page 19 Apply several couple of coats of BVM Heat Shield to the aft area of the bypass. The upper portion of the bypass, if used, may be trimmed to suit the particular turbine installed and retained with Velcro straps. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 19 of 24...
  • Page 20 While this is a big model, the builder may run out of space quickly if the layout and routings are not well planned. The installation of a JetCat P-120 is shown in the photos below. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 20 of 24...
  • Page 21 No significant pitch re-trim is required with flap deployment. The plane may initially “balloon” when you lower the flaps to landing depending on the airspeed at the time. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 21 of 24...
  • Page 22 Install the servo cover (illustrated in black below). Using the lines around the outside of the cutout, draw the extents of the required cutout as shown below. Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 22 of 24...
  • Page 23 Take your time and ensure that you have checked and tested all systems. Congratulations, you’ve completed building your new Fei Bao MiG-21! Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 23 of 24...
  • Page 24 Fei Bao MiG-21 Fishbed Instruction Manual (Draft Rev 0) Page 24 of 24...