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SIG SUKHOI SU-31 ARF, Инструкция по сборке, Страница: 13 / 26

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uniform and free of any loose glass. Be careful not to sand the
paint on the outside of the cowl. Remove all fiberglass dust from
the cowl with tac rag or with alcohol on a clean cloth.

❑

5) We recommend a 3-1/4" dia. aluminum spinner (not 

supplied) for the SUKHOI.

TAIL SURFACES
The following instructions depict the installation of dual elevator
servos and a single rudder servo, all mounted at the rear of the
fuselage. This provides the simplest, most direct linkage from the
servos to the control surfaces. There are cutouts provided in the
rear of the fuselage sides for the servos. If you look closely you
can see the cutouts underneath the covering material. The two
elevator servos go in the two uppermost cutouts, right underneath
the stabilizer. The single rudder servo goes in the lower cutout on
the right side of the airplane.

NOTE: Some fliers prefer to use a pull-pull cable system for the
rudder, with the rudder servo mounted in the front of the airplane.
For those that prefer that method we have provided a single servo
tray in the front of the fuselage for the rudder servo. No other
materials are provided for making a pull-pull cable rudder hookup.

❑

1) Use a sharp #11 blade to open up the two elevator servo 

cutouts and the rudder servo cutout at the rear of the fuselage.
Use a trim seal iron to tack the loose covering around into the
cutouts. Trim and remove the excess covering material.

NOTE: Accurate alignment is ultra critical to the performance of
an aerobatic airplane like the SUKHOI.

For that reason, we 

recommend that you buy or borrow an accurate "incidence meter"
(like a Robart

®

Incidence Meter) to help with the final alignment of

the tail surfaces during the next steps.

❑

2) Use a ruler to find the exact center of the stabilizer at the

trailing edge, marking the location with a felt-tip pen. Then use a
90

O

triangle to draw a centerline on the stab at this location.

❑

4) You need to cut adaquete size openings in 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
front of the cowl (with the spinner in place) for air to come in. In
other words, ALL the air that comes in the front of the cowl, must
have room to get out!  Some air will escape around the sides and
bottom of the cowl, but that is not enough. Additional openings in
the bottom of the cowling are absolutely necessary for proper 
cooling!  Without these additional openings, your engine may 
overheat and quit. The exact dimensions and locations of the
openings may certainly be "customized" for your particular
engine/muffler set-up, as long as there is sufficient total square
inches of air exit area.

NOTE:

In this picture of our FPE 2.4 gas engine installation,

notice the 1-1/2" wide x 3-3/4" long cooling opening, a 1-1/2" wide
x 2-1/2" long cooling opening, another 1-1/2" wide x 2-1/2" long
opening for the muffler pipes to stick through, and a 7/8" dia. round
hole for the spark plug to stick out. All of these holes contribute to
the total square inches of cooling air exit area.

TIPS ON CUTTING HOLES IN A FIBERGLASS COWLING: First
of all, be sure to wear safety glasses and a mask of some kind to
avoid inhaling any fiberglass dust. Use a fine-point marker pen to
draw an exact outline of the area you want to cut out. Then use a
Dremel

®

Tool and a large cut-off wheel to remove the bulk of the

area inside the lines. If you are careful, you will find that you can
get fairly close to the lines with the cut-off wheel. The goal is to
remove most of the material within the lines. Once the majority of
the area is cut and removed, exchange the cut-off wheel for a
sanding drum bit in your Dremel

®

Tool. Use the drum sander to 

finish the edge right up to the line. Finally, use 220 sandpaper by
hand to clean up any jagged edges. Make sure all edges are

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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