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Fei Bao MiG-21 Fishbed, Инструкция по эксплуатации

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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 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. 
 

 

 

 

 

 

 

  

 

 

Содержание MiG-21 Fishbed

Страница 1: ...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 ...

Страница 2: ... to have a second experienced modeler go over your installation after assembly A second set of eyes may spot a problem you have missed If you have not flown a model like this before it is HIGHLY recommended that you get an experienced turbine pilot to do your maiden flight Very often the first few seconds of a maiden flight are critical until the aircraft is trimmed out and having an experienced p...

Страница 3: ...to the inside of the wing as it dries and you won t even know it is happening Hysol stays where you put it The downside of Hysol is it takes overnight to dry properly but we have tried to arrange things to keep you busy while waiting for glue to dry We also highly recommend that you only use a proper Hysol dispensing gun and only the long type mixing nozzles The short nozzles do not sufficiently m...

Страница 4: ...s available which can be used for these functions Several possible solutions are listed below The individual builder may choose one of these solutions or provide their own solution based on their experiences and preferences Retracts Gear Doors Solution 1 Retracts Provided spool valve JR 341 servo or equivalent Gear doors Pushbutton valve such as BVM 5753 Air Micro Switch Solution 2 Retracts Provid...

Страница 5: ...nual fuel shutoff valve Safety wire Blue thread locker Glues cyanoacrylate CA glue thin medium and thick Loctite Hysol Zap a Dap a Goo Batteries Receiver and ECU Regulator and switch Servo extensions length may vary depending on receiver placement Control linkage hardware as preferred by the builder Additional Required Tools X Acto knife 11 blades Acetone alcohol swabs Felt tip marker Pencil Ruler...

Страница 6: ...A slot has been precut in the rudder to receive the control horn The horn itself needs to be trimmed slightly at the front so that the clevis hole aligns with the hinge line The photo below shows the trimmed rudder horn and a stock horn The horn is roughened up with a Perma Grit file and Hysol d in place An alcohol swab is used to clean any residual Hysol from the area Hinges Three point style hin...

Страница 7: ...F angles which are pre drilled to accept the 3mm supplied mounting screws This assembly is then positioned in the servo cutout 1 16 pilot holes drilled in the plywood mounts and the assembly is screwed down The flap control horn needed to be modified by grinding it away slightly at the front see rudder control horn section such that it fit properly in its precut slot Be sure to sand the sides of t...

Страница 8: ...ood 1 1 4 x 3 4 to the inside surface of the lower wing skin add some hardwood blocks to support the new mounts and tie them to the pre installed ply and the inner surface of the upper wing skin Trim the kit supplied CF angles and drill new holes drilled to match the servos 1 16 pilot holes were drilled into the mounts and the angles screwed in place If the servo cover contact the head of the scre...

Страница 9: ... fuel flow would be maintained regardless of the attitude of the model when flying The photos below show the fuel lines within the saddle tanks The 5 32 brass tubing was annealed using a blowtorch to allow it to be easily bent using a Dubro tube bender Dubro fuel line barbs were soldered to each end of the brass pieces BVM 2804 Fuel Line was used to connect the individual pieces of the clunk line ...

Страница 10: ...ach the bottom of the tank The bend prevents the clunk from reaching the last 4 oz of fuel in each saddle tank when the plane is inverted This is not an issue since the saddle tanks feed the main tank If the model is rolled inverted when the saddle tanks are almost empty fuel will be supplied from the main tank Once the model is returned upright any fuel left in the saddle tanks will immediately b...

Страница 11: ...such a 90 degree bend in the fuel and vent lines prevents any interference between the lines and the cockpit Fuel Tank Installation The saddle tanks fit between two bulkheads installed in the fuselage with the stopper fitting in the slot in the forward bulkhead Use a Dremel tool to widen lengthen the slot as necessary to fine tune the fit of the tanks There should be approximately gap between the ...

Страница 12: ...ing blocks which are pre installed on a fuselage former The axles have a notch for alignment with the control horn The stab root chord has a Z bend which fits into a matching notch in the fuselage This scale notch makes the H stab install a bit more of a challenge to install than a stab with a straight root chord if you want to minimize the gap between the stab and the fuselage yet allow the stab ...

Страница 13: ...age This will allow the stabs to be installed with only a 1 32 gap between the stab and the fuselage which will enhance the look of your model Use touchup paint to blend any spot putty visible 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 S...

Страница 14: ...ear fuselage and attached the rod ends to the stab control horns Use tape to lock the H stabs at neutral to give the required fore aft position of the servo sub assembly on the plywood plate Position the servo sub assembly such that the control rod is horizontal Place a strip of 1 4 square balsa against the servo and tack glued it to the plywood plate The strip serves as a jig to quickly locate th...

Страница 15: ...hatch for the engine compartment is only 5 wide and 12 fortunately the main gear doors and speed brakes provide a bit more access but there isn t a lot of room to work and a long pair of surgical hemostats clamp makes things a lot easier Tidi Strips are invaluable in making a clean installation Jets N Stuff Airline Safeties save a lot of time over using safety wire Safety wiring the pneumatic line...

Страница 16: ...es 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 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 ...

Страница 17: ...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 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 ...

Страница 18: ... the turbine centerline Mount the turbine using screws or bolts and blind nuts Fuselage Joining Exhaust Duct Installation Remove the turbine and lower bypass and join the front and rear fuselage using the provided bolts washers Test fit the double walled exhaust duct in the rear fuselage The outer diameter tapers slightly and the pipe should be installed such that the rear of the duct is approxima...

Страница 19: ...n 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 portion of the bypass if used may be trimmed to suit the particular turbine installed and retained with Velcro straps ...

Страница 20: ...n balancing the model on the required C G location In the model pictured the ECU and receiver batteries were installed in the nose of the model forward of the nose gear door using adhesive backed Velcro and foam A 3 8 thick piece of hardwood was glued to the top of the rear former supporting the equipment tray so that the installed tray would be approximately level Turbine Accessory Mounting Locat...

Страница 21: ...ositions not just the end points The recommended control throws are as follows Rudder 1 left and right measured at the base of the rudder Ailerons 3 8 up and down measured at the inboard trailing edge Elevator 2 up 1 1 2 down measure at leading edge root chord Take Off Flaps 1 down measured at inboard trailing edge Landing Flaps 2 down measured at inboard trailing edge Elevator trim For takeoff el...

Страница 22: ...ethod illustrated below can be used to determine the size length and location of the slot required in each servo cover Move the servo arm the maximum commanded deflection Using a ruler and pencil make pencils marks around the outside of the servo cutout to show the required size of the slot Remove the linkage from the servo arm and rotate the arm below the level of the servo cover Install the serv...

Страница 23: ...he landing gear is down up brakes on off and airbrakes open shut Check that the landing gear retract extend properly and that the gear doors and air brakes open shut without binding Fuel and defuel the aircraft to ensure that all fuel tanks completely fill and completely empty If you find any problems correct them BEFORE flying It is far better for your model to be on the ground and you wishing it...

Страница 24: ...Fei Bao MiG 21 Fishbed Instruction Manual Draft Rev 0 Page 24 of 24 ...

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