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Fei Bao MiG-21 Fishbed Instruction Manual

Manual is about: 1/5.5 Scale

Summary of MiG-21 Fishbed

  • Page 1

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 1 of 24 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 chann...

  • Page 2: Disclaimer

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 2 of 24 disclaimer this is not a toy. This is a high-performance miniature aircraft, capable of high speeds and damage to life, limb, and property. The manufacturer and its distributors cannot control how you assemble this model, what equi...

  • Page 3: Introduction

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 3 of 24 a. Introduction you have chosen a model that represents the pinnacle of arf technology. While there is not a lot of building to do, there is enough to keep you busy for a few evenings. Even if you have assembled maybe other arf jet...

  • Page 4: Additional Items Required

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 4 of 24 the time to get everything pneumatic right the first time, as having your landing gear fail to retract is not that bad, but having it fail to deploy can really ruin you day and the paint on the bottom of your model. D. Additional i...

  • Page 5

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 5 of 24 provided spool valve & jr 341 servo or equivalent solution #2 jet-tronics dual action electronic pneumatic valve other pneumatic components many builders prefer to install pressure gauges in the retract and brake systems to easily ...

  • Page 6

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 6 of 24 rudder servo installation and rudder plywood mounts for the rudder servo have been pre-installed in the fin. A mid-mount style servo such as the jr ds3301 can be screwed directly to the plywood. A couple of strips of ply or hardwoo...

  • Page 7

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 7 of 24 nose wheel steering servo installation using 3mm bolts and blue loctite, install the nws servo mounts into the plated steel frame attached to the nose gear strut. Adjust the nws pushrods to the correct length to engage the servo ar...

  • Page 8

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 8 of 24 aileron servo and control horn installation like the rudder servo, the aileron servo plywood mounts are set up for a mid-mount style servo (eg jr ds3301) which can be quickly and easily screwed directly to the plywood. A couple of ...

  • Page 9

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 9 of 24 fuel tanks note: the fuel tanks may be purchased pre-plumbed by the factory. It is recommended that you inspect the tanks to ensure that the clunk will pick up fuel regardless of the attitude of the tank. The saddle tanks are appro...

  • Page 10

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 10 of 24 the 2" length of brass tubing helps to prevent the clunk line from falling forward also reduces the clunk’s ability to reach the bottom and top of the tank. A slight bend (approx 10 degrees) in the brass tubing at the stopper as s...

  • Page 11

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 11 of 24 the main fuel tank has a capacity of approximately 60oz and is long and narrow so the internal plumbing arrangement is more typical. A length of brass tubing in the clunk line (similar to the 2” length of tubing used in the saddle...

  • Page 12

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 12 of 24 the main fuel tank is supported at the rear by the saddle tanks. A front support can be made from 1/8” plywood screwed to hardwood blocks hysol’d to the fuselage. Sticky-backed velcro can be used to secure the tank from moving for...

  • Page 13

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 13 of 24 portions of the root chord may be sanded down or build up using spot putty, as required, to adjust the h-stab root contour such that it matches the fuselage. This will allow the stabs to be installed with only a 1/32” gap between ...

  • Page 14

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 14 of 24 the h-stab servos are mounted on plywood plates that are pre-installed in the fuselage. Roughen the surface of the plates with some course grit sandpaper. Use angle brackets and hardwood blocks as servo mounts as well as the clevi...

  • Page 15

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 15 of 24 inlet duct modification while the model is equipped with full inlet ducting and a bypass, the builder may choose to eliminate the inlet duct to simplify access to the internal components to facilitate any maintenance. The split po...

  • Page 16

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 16 of 24 there are many possible layouts/routing for the air lines. One possibility is shown in the photos below but it is up to the builder to determine what works best for them and their choice and location of the valves. Two pieces of p...

  • Page 17

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 17 of 24 servo wire routing h-stab and rudder servo wires in the rear fuselage should be protected from heat generated. Metal tape and/or a ceramic blanket can be used to insulate the wires from heat. The aileron and flap servo wires are r...

  • Page 18

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 18 of 24 route through this area. Ensure that the air lines and servo wires are routed such that they are not chaffed by the main wheels when the landing gear is retracted. Bypass and turbine installation the builder may opt to install a f...

  • Page 19

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 19 of 24 any extra material and drill a hole in the mount. Match drill a hole in the bulkhead and use socket head screws to retain the exhaust duct. Apply several couple of coats of bvm heat shield to the aft area of the bypass. The upper ...

  • Page 20

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 20 of 24 equipment tray and battery mounting the equipment tray layout is dependant upon the equipment selected and the builder’s preferences. Many possibilities are possible with only one pictured below. Items to consider when laying out ...

  • Page 21

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 21 of 24 center of gravity and control throws balance the plane with the uat full and the landing gear in the down position. The recommended c.G. Location is 16.25” back from wing leading edge at the wing root chord. Adjust all linkages an...

  • Page 22

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 22 of 24 servo covers cutting the slots for the servo control horns should be done after the linkages, neutral, and control throws have been adjusted. This allows you to cut the minimum size required slot in the servo cover and helps to ma...

  • Page 23

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 23 of 24 drill a hole at each end of the slot such that the drill diameter is the same as the width of the slot. Using a knife, saw, or cutoff wheel, remove the remaining slot material (colored in red in the photo below). Screw the servo c...

  • Page 24

    Fei bao mig-21 fishbed instruction manual (draft rev 0) page 24 of 24.