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Sukhoi SU 31—2.75m/2.6m                                                                                                                                                               Page|6

You will not require any specialized tools to build your Sukhoi SU-31. However some items make the job a little eas-
ier, such as a tapered reamer (RC car body reamer), a step drill bit and a centre drill bit.  These items make drilling
holes in the composite materials less problematic, and very simple. Normal drills , can at times, tear at the material,
particularly when making larger holes. The centre dill bit ensures an accurate drill path during the drilling process.
These items should be easily obtained from your local hobby store, and or hardware store like  Home Depot  etc. If
you can t obtain these style items, don t stress, the job can still be done with a little due care.

Electric or Battery Drill

    Pedestal type preferred, hand held

Drill Bits

    Various sizes, metric

Sharp Knife

    X-Acto or similar

Measuring

    Steel rule(s), tape measure,  square (ruler), small level

Dremel Tool

    With cutting discs, sanding drums, and various burrs

Hand Tools

    Screw drivers, pliers, ball drivers, hex drivers etc

Additional Materials

    Masking tape, sand paper, marking pen, soft cloth (towels)

Tools Required

Securing fuel line and servo extension leads is made a little easier when you use self adhesive clips and rubber
grommets. Most of these items should be readily available from your local hardware store. You may have other
methods that you prefer to use to protect your leads and fuel lines, and that is fine, as long as they are secured in
position and protected from chaffing where they pass through, or over structural components.

Summary of Contents for Sukhoi SU 31

Page 1: ...Sukhoi SU 31 2 75m 2 6m Page 2 75M 2 60M Sukhoi SU 31 Assembly Manual...

Page 2: ...show or freestyle contest As usual with our SU 31 2 75m you get an extremely well prefabricated airplane It is super strong yet light weight and well engineered for the flying stresses in competition...

Page 3: ...l must rely upon your own expertise and judgement in acquiring and operat ing this model Personal safety There are a couple of things that are good to keep in mind when you are assembling your Sukhoi...

Page 4: ...o arm on the rudder a 4 to 4 5 offset arm is suitable Please consider the use of a good quality throttle servo preci sion is required to maintain good throttle trim and consistent idle control A poor...

Page 5: ...good constant idle requires a precise servo such as a JR DS8231 or a Futaba S3071HV Alloy Servo Arms SWB Secraft Hanger 9 or similar 1 5 for Elevators and aileron Phenolic rudder arm supplied Spinner...

Page 6: ...still be done with a little due care Electric or Battery Drill Pedestal type preferred hand held Drill Bits Various sizes metric Sharp Knife X Acto or similar Measuring Steel rule s tape measure squa...

Page 7: ...nd a 6mm nut and a 6mm Nyloc nut to secure the wheel to the leg Please note some wheels need to be drilled out to accept the 6mm axle bolt Use the washers provided to space the wheel correctly on the...

Page 8: ...inner to cowl alignment So if you can manage try and get the required marks with the cowl full assembled but if you find it too difficult just use the bottom half but double check your marks with the...

Page 9: ...ture or to suit your chosen engine When you are satisfied with your engine position markings drill your mounting holes Drill a 3mm pilot hole first then use a 7mm drill bit to enlarge the hole to suit...

Page 10: ...you are passing the ignition high tension leads through the dome ensure they are protected and not resting against the cut fiberglass Rubber blanking plugs are ideal for this simply punch a hole in t...

Page 11: ...ine dome in preparation for marking out the desired cut out area Again the area that needs to be cut out will vary dependant on your exhaust selection It s important with a dual canis ter installation...

Page 12: ...ck them as part of your routine maintenance program replace when necessary In the parts bag supplied you will find 2 9mm x 13mm pan head sheet metal screw to mount your servos It s important that you...

Page 13: ...25mm forward of the stab tube The servo lead needs to be protected in some way from the harshness of the fibreglass fuselage The edges of the fibreglass will quickly wear through the protective coatin...

Page 14: ...the hatch in place and hold them there with some mask ing tape while you pre drill the holes for the hatch retaining screws Use a small drill bit 1 5 2mm to drill the holes for the hatch cover retenti...

Page 15: ...before the silicone sets Hold in place with masking tape while everything goes off As an alternative to the plywood servo mount you could also use a JR single servo side mount 07 04 These items are p...

Page 16: ...old one is pretty straight forward The clear canopy needs to be trimmed first Start by removing the excess material so you can fit it over the canopy frame for marking The canopy can be cut with shar...

Page 17: ...king it A syringe is one of the easiest ways of applying the silicon between the canopy and frame A 30ml syringe has more volume than re quired but its physical size makes it easier to handle it s gre...

Page 18: ...c arms are required to be mounted onto alloy servo discs DO NOT USE THE STD NYLON SERVO DISCS The standard discs provided with the servos may strip under heavy loads resulting in control surface flutt...

Page 19: ...have a measurement you need to transfer that to the outside of the fuselage Place some masking tape on the fuselage roughly where your mark will be With the straightedge on the canopy seat mark a line...

Page 20: ...enolic servo arm provided in the hardware pack you can simply loop the cable through the slot in the arm and crimp If you elect to use an alloy arm you can repeat the same process as you have already...

Page 21: ...e C of G is located The carbon rods will need to be cut down to suit ours came in at 282mm and 276mm However this measurement may vary from model to model so please take a cor rect measurement to meet...

Page 22: ...surface Use some card to get the basic shape you require and then trace the shape onto the balsa The thin ply can be easily cut with scissors and the final shape trimmed with a sanding block We used...

Page 23: ...0mm more down at full rates Although at full rates the roll rate will be blistering as you move into low or mid rates the preset differential will become more evident Obviously you can use your transm...

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