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SIG SUKHOI SU-31 ARF, Инструкция по сборке, Страница: 2 / 26

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type of setup work properly with a standard Y-harness you would
have to electronically reverse the wiring inside one of the elevator
servos so that both elevators will go up (or down) at the same time.
However, there is an after-market Y-harness available that 
electronically reverses one of the elevator servos for you. It also
has a centering adjustment pot that lets you dial in the elevators
exactly to a neutral relationship with each other. The product is
called the "MIRACLE Y™ Servo Reversing Y Adapter", sold 
by MAXX PRODUCTS of Lake Zurich, IL. It can be ordered with
any radio manufacturer's connectors you specify.

We have 

thoroughly tested this product and found it to be reliable, easy to
use and very reasonably priced. In addition, it is a total of 24" in
length - 12" of elevator extension cables and a 12" cable lead to
the receiver. Perfect for the SUKHOI SU-31.

RX BATTERY PACK: Finally, since you will be using a total of six
servos to fly this airplane, we strongly suggest you use a large
capacity battery pack for use in this model. We have used both
1000 mAH and 1200 mAH packs with very good results. Using the
light 1000 mAH pack, we have been able to safely fly five or six
flights during any given flying session, a reasonable amount of 
flying time for most modelers. Naturally, a larger pack provides
more flight time but remember that larger can also equate to 
heavier. We also suggest that you routinely use an Expanded
Scale Voltmeter (ESV) at the field to check the charge condition of
your batteries. This common piece of field equipment can save
your model!

ENGINE & SPINNER
The SIG SUKHOI SU-31 has been flown with a wide variety of
engines. As everyone knows, there is no substitute for power, and
the engines recommended for this model all provide good power
margins. Naturally, the larger engines in this range make more
power and will fly the SUKHOI with more authority than the small-
er engines. It is simply a matter of how you want to fly the airplane.

RECOMMENDED ENGINES
2-STROKE GLOW ENGINES: 1.50 - 2.10 cu.in.
4-STROKE GLOW ENGINES: 1.80 - 2.70 cu.in.
GAS ENGINES: 2.4 cu.in.

GLOW ENGINES:

GAS ENGINES: Our preferred engine for the SUKHOI is a 2.4 cu.
in. gas engine. Our hands down favorite is the FIRST PLACE
ENGINES FPE 2.4 cu. in. gas engine, available from SIG.
Weighing only 52 ounces, this compact powerhouse delivers
approximately 18 pounds of thrust with a 20x10 prop. You can
imagine how that makes a 14 pound SUKHOI perform!

If you use a gas engine in your SUKHOI, be aware that the fuel
tank stopper and the fuel tubing that are supplied in this kit ARE
NOT gasoline compatible. Be sure to replace them with suitable
after market components. The kit supplied fuel tank body itself is
gasoline compatible.

SPINNER: Regardless of which engine you use in your SUKHOI,
we recommend that you obtain a high quality 3-1/4" dia. aluminum
spinner. Do not use a plastic spinner for engines this large.

KIT CONTENTS
The following is a complete list of every part included with your
SUKHOI SU-31 ARF kit. Use the check-off blocks to inventory
your kit before beginning assembly.

BAG 1: RIGHT WING

❑

1

Right Wing Panel

❑

1

Right Aileron

❑

4

Hinge Points, installed but not glued

BAG 2: LEFT WING

❑

1

Left Wing Panel

❑

1

Left Aileron

❑

4

Hinge Points, installed but not glued

BAG 3: FIN & RUDDER:

❑

1

Fin 

❑

1

Rudder 

❑

3

Hinge Points, installed but not glued

BAG 4: STABILIZER & ELEVATORS

❑

1

Stabilizer

❑

1

Right Elevator 

❑

1

Left Elevator

❑

6

Hinge Points, installed but not glued

BAG 5: FUSELAGE

❑

1

Fuselage

❑

1

Landing Gear Fairing 

❑

2

M2.6 x 12mm PWA*  Screws, for l.g. fairing

❑

1

Molded Plastic Canopy Base

❑

1

Molded Clear Plastic Canopy

❑

6

M2.6 x 10mm PWA*  Screws, for canopy

BAG 6: COWLING

❑

1

Fiberglass Cowling

❑

4

M2.6 x 10mm PWA*  Screws

BAG 7: WING FAIRING

❑

1

Molded Plastic Wing Fairing

BAG 8: TAIL FAIRING

❑

1

Molded Plastic Tail Fairing

BAG 9: MAIN LANDING GEAR

❑

1

Aluminum Landing Gear

❑

4

M4 x 15mm PWA* Bolts

GAS ENGINE

4-STROKE

ENGINE

2-STROKE

ENGINE

Saito 1.80

Irvine 1.50

FIRST PLACE ENGINES

FPE 2.4

Содержание SUKHOI SU-31 ARF

Страница 1: ...elevator servos will be mounted on opposite sides of the fuselage in exact mirror image to each other i e with the pushrods coming off the top of each servo in direct line with the control horns This is done so the geometry of the servos pushrods and horns is exactly symmetrical on both sides providing the exact same response to control inputs for each elevator This is very important in an all out...

Страница 2: ... authority than the small er engines It is simply a matter of how you want to fly the airplane RECOMMENDED ENGINES 2 STROKE GLOW ENGINES 1 50 2 10 cu in 4 STROKE GLOW ENGINES 1 80 2 70 cu in GAS ENGINES 2 4 cu in GLOW ENGINES GAS ENGINES Our preferred engine for the SUKHOI is a 2 4 cu in gas engine Our hands down favorite is the FIRST PLACE ENGINES FPE 2 4 cu in gas engine available from SIG Weigh...

Страница 3: ...er climate you may notice that some wrinkles might develop after removing the covered parts from their plastic bags If that is the case there is no need to be alarmed The covering is not defective This is perfectly normal and has nothing to do with the covering material or how it was applied It has to do with the wood beneath the covering Wood takes on or loses ambient humidity Your SUKHOI ARF was...

Страница 4: ...ool with Selection of Sanding and Grinding Bits Soldering Iron and Solder Large Fuel Tubing WING ASSEMBLY Before starting actual construction trial fit both wing panels onto the Hardwood Wing Joiner and the Aluminum Tube Rear Wing Joiner Check to see that the wing panels fit together in proper alignment and that both root ribs come into firm straight contact with each other If the Hardwood Wing Jo...

Страница 5: ... and to check servo travel Make sure both servo output arms are 90O to the servos and that they are long enough to clear the wing s bottom surface during extremes of travel a Now attach 12 long servo extension chords to both aileron servos Note Be sure to put a piece of tape around the connecting plugs so they can t come apart while hidden in the wing b Feed the servo extension chords into the win...

Страница 6: ...F 1 show the exact locations Drill completely through the foremost wing structure including the hardwood wing joiner that the hinge can be pushed in far enough for the pivot point to line up with the front V point of the aileron leading edge We recommend enlarging the opening of the hinge holes slightly with a hand held 1 4 dia drill bit You only need to twist the drill bit in about an 1 4 or so C...

Страница 7: ...m of the wing where the side flanges make 11 Use slow drying epoxy to install the two hardwood dowels into the front of the wing First trial fit the dowels into the holes without glue to make sure they can be pushed in far enough You want to end up with about 1 2 of dowel remaining exposed in front of the plywood former Take the dowels back out and apply plenty of epoxy glue inside the two holes S...

Страница 8: ...e servo output arms on the output shaft to exactly 90O upright when the servos are neutral c Test the action of the servos making sure the output arms move freely and that they move in the correct directions for left and right aileron action d Turn off the radio system and disconnect the aileron servos from the Y harness 18 Locate one left and one right metal control horn and eight M2 6 x 10mm Met...

Страница 9: ...er engine installations will be similar 1 You need to purchase a suitable engine mount not supplied to fit your particular engine and the appropriate mounting bolts blind nuts not supplied to attach the mount to the firewall A wide variety of after market engine mounts are available Many of them are one piece and sized to fit a particular engine We recommend that you choose aluminum mounts for eng...

Страница 10: ...he front of the firewall carefully aligning it with the horizontal and vertical thrust lines Mark the mount s bolt hole locations on the firewall with a pencil Drill holes completely through the firewall at those locations for the mounting bolts Finally bolt the engine mounts in place being sure to glue the blind nuts into the back of the firewall 3 With the engine mount bolted on the firewall pla...

Страница 11: ...2 CYCLE GASOLINE ENGINES Gasoline engines like the FPE 2 4 pictured here fit best in the SUKHOI when mounted inverted You will need to purchase mounting bolts and blind nuts to fit your particular engine installation 1 The FPE 2 4 gas engine measures 5 from the prop drive washer to the back of the engine mount while the SUKHOI is designed with a firewall to prop washer distance of 6 Consequently y...

Страница 12: ...back edge of the cowling uncovered for the next step NOTE The SUKHOI has lots of room inside the cowling and the engines that we have used fit completely inside except for the muffler pipes and the spark plug of the FPE 2 4 gas engine 3 With the cowl securely taped in place use a 3 64 or 56 dia bit to drill pilot holes in the fuselage centered in each of the four pre drilled holes in the cowl Moun...

Страница 13: ... the bottom of the SUKHOI cowling to allow engine cooling air to properly flow through and exit the cowl Cooling a fully cowled engine is not difficult although many modelers have trouble doing it It s relatively simple if you follow one basic rule Simply stated the total square inches of area you have for air exit must be equal to or slightly more than the square inches of area you have in the fr...

Страница 14: ... fin Let dry 8 Trial fit the fin in place on the fuselage The bottom of the fin should rest on the high point of the stabilizer a View and measure the alignment of the stabilizer to the entire airplane from several different angles Make sure that the fin is absolutely 90O upright on the fuselage and that it is aligned straight with the centerline of the fuselage not turned left or right 3 Next bol...

Страница 15: ...n and eight M2 6 x 10mm Metal Screws Hold one of the control horns in position on the bottom leading edge of the appropriate elevator The horn should be as far forward as possible so that the holes in the horn line up directly over the stab elevator hinge line Also be sure the control horn lines up with the elevator servo output arm Mark the horn s hole locations on the elevator with a fine point ...

Страница 16: ...eutral position Attach the solder link ends of the elevator pushrods to the servo output arms Adjust the threaded R C links to fit into the middle hole of each elevator horn Remove the tape holding the elevators in neutral and test the movement of the elevators with your radio Adjust as required to get both elevators exactly at neutral if you are using the Miracle Y splitter chord you can turn the...

Страница 17: ...f masking tape hold the clear canopy tight against the base and fuselage while the glue dries b With the rudder and tailwheel both in neutral position apply a small amount of tension to the spring and use the pliers to make a 90O bend at the tailwheel steering arm hole Insert the wire into the steering arm and make another 90O bend back toward the center of the spring forming a loop Do the same fo...

Страница 18: ...ed to its characteristics you will likely change the control throws to suit your style of flying But you have to start somewhere and this is where you begin These movements provide the SUKHOI with very smooth control inputs without the immediate need for exponential We suggest starting out with these movements as your low and high rates You can easily play with more control throw after you become ...

Страница 19: ...ur style We therefore suggest that you begin with the 27 CG location and experiment from there you have had time to shift it around into exact position Once you have it in position squeegee the excess soapy water out from under the decal Mop up the water with a dry cloth Squeegee repeatedly to get as much of the water out from under the decal as possible After setting overnight the decal will be s...

Страница 20: ...ing the model this imbalance can cause the model to pull to the heavy side especially in loops and up line maneuvers To make the airplane track true the light wing panel needs weight at the tip to balance it level with the other panel Again this can be done with stick on weights which could later be hidden inside the wingtip If you need to move your balance point fore or aft slightly the first met...

Страница 21: ...nput You will also discover that your SUKHOI has outstanding inverted flight characteristics Our prototypes require only the smallest amount of down elevator to maintain level inverted flight Assuming you re comfortable and getting used to the airplane take it to a safe altitude and throttle back to get a feel for the slow flight and stall characteristics Properly balanced and trimmed your SUKHOI ...

Страница 22: ...22 SUKHOI SU 31 LOG BOOK Engine Prop Flying Weight Wing Loading Balance Point Aileron Travel Elevator Travel Rudder Travel Date of first flight ...

Страница 23: ...23 ...

Страница 24: ...ing the most power at a reasonable cost First Place Engines are your best choice for large gasoline powered model airplane power plants All engines use piston and cylinder assemblies from world renowned manufacturers such as Husqvarna and Sachs Makita insuring long life and easy operation Using state of the art CNC machines First Place produces all other major components from high quality billet a...

Страница 25: ... either model size or full size are not toys Because of the speeds that airplanes must achieve in order to fly they are capable of causing serious bodily harm and property damage if they crash IT IS YOUR RESPONSIBILITY AND YOURS ALONE to assemble this model airplane correctly according to the plans and instructions to ground test the finished model before each flight to make sure it is completely ...

Страница 26: ...The color and markings of this ARF kit do not duplicate one particular full scale Sukhoi SU 31 Rather they are a realistic selection of markings typically seen on many full scale aerobatic airplanes 26 ...

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