NEXA Yak 9 User guide

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45 Class

2-cycle engine

70 Class

4-cycle engine

Or Electric equivalent

YAK

INSTRUCTION MANUAL / Montageanleitung

All balsa, plywood construction and almost ready to fly

TECHNISCHE DATEN

Spannweiter 1520mm Lange 1237mm Elektroantrieb 800-900Watt Verbrennerantrieb 7.5cc 2-T / 11cc 4-T Fernsteuerung 6 Kanal / 6-7 Servos

WARNING! This radio controlled model is NOT a toy. If modified or flown carelessly it could go out of controll and cause serious human injury or property damage. Before flying your airplane, ensure the air field is spacious enough. Always fly it outdoors in safe areas and seek professional advice if you are unexperienced.

ACHTUNG! Dieses ferngesteuerte Modell ist KEIN Spielzeug! Es ist für fortgeschrittene Modellflugpiloten bestimmt, die ausreichende Erfahrung im Umgang mit derartigen Modellen besitzen Bei unsachgemäßer Verwendung kann hoher Personen- und/oder Sachschaden entstehen. Fragen Sie in einem Modellbauverein in Ihrer Nähe um professionelle Unterstützung, wenn Sie Hilfe im Bau und Betrieb benötigen. Der Zusammenbau dieses Modells ist durch die vielen Abbildungen selbsterklärend und ist für fortgeschrittene, erfahrene Modellbauer bestimmt.

SPECIFICATIONS

Wingspan 59.8 in. Length 48.7 in. Electric Motor 800-900Watt Glow Engine .46 2-T / .70 4-T Radio 6 Channels / 6-7Servos

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OPTIONAL ACCESSORIES / BENOTIGTES ZUBEHOR

Minimum 6 channel radio for airplane with 7 servos

.Motor control x1 .Aileron x2 .Flap x2 (mini servo) .Elevator x1 .Rudder x1

GLUE

(Purchase separately)

SILICON

Silicon sealer

10.5x6 for .40 - 2 cycle engine 11x6 for .46 - 2 cycle engine 12x6 for .60 - 4 cycle engine 12x7 for .70 - 4 cycle engine 11x8 for Brushless Motor

.46 ~ .50 - 2 cycle

Silicone tube

Cyanoacrylate Glue Klebstoff

.60 ~.70 - 4 cycle

Li-Po Battery

EPOXY A

EPOXY B

Extension for aileron flap and retract servo.

www.motionrc.com

ESC:60-65A

800-900Watt brushless Motor

Epoxy Glue (5 minute type) Epoxy-Klebstoff (5min-Typ)

Epoxy Glue (30 minute type) Epoxy-Klebstoff (30min-Typ)

TOLLS REQUIRED

(Purchase separately)

Hex Wrench

Hobby knife

Needle nose Pliers

Phillip screw driver

Awl

Scissors

Sander

.........................................................

Wire Cutters

Masking tape - Straight Edged Ruler - Pen or pencil - Rubbing alcohol - Drill and Assorted Drill Bits

If exposed to direct sunlight and/or heat, wrinkels can appear. Storing the model in a cool place will let the wrinkles disappear. Otherwise, remove wrinkles in covering film with a hair dryer, starting with low temperature. You can fix the corners by using a hot iron.

Bei Sonneneinstrahlung und/oder Wärme kann die Folie erschlaffen bzw. Falten entstehen. Verwenden Sie ein Warumluftgebläse (Haartrockner) um evtl. Falten aus der Folie zu bekommen. Die Kanten können Sie mit einem Bügeleisen behandeln. Nicht zuviel Hitze anwenden !

Drill holes using the stated

size of drill

1.5mm

(in this case 1.5 mm Ø)

Use epoxy glue

Take particular care here

Apply cyano glue

Hatched-in areas:

remove covering film carefully

Assemble left and right

L/R

sides the same way.

Check during assembly that these

parts move freely, without binding

Not included. These parts must be

purchased separately

Low setting

CONVERSION TABLE

1.0mm = 3/64”

1.5mm = 1/16”

2.0mm = 5/64”

2.5mm = 3/32”

3.0mm = 1/8”

4.0mm = 5/32”

5.0mm = 13/64”

6.0mm = 15/64”

10mm = 13/32” 12mm = 15/32” 15mm = 19/32” 20mm = 51/64”

25mm = 1” 30mm = 1-3/16” 45mm = 1-51/64”

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YAK-9

Read through the manual before you begin, so you will have an overall idea of what to do.

This model is highly pre-fabricated and can be built in a very short time. However, the work which you have to carry out is important and must be done carefully. The model will only be strong and fly well if you complete your tasks competently - so please work slowly, accurately and check every joints, maybe apply more glue to be safe.

1- MAIN WING: Extension cord & Servo

SAFETY NOTES BEFORE ASSEMBLING

Using the thread (pre-installed at factory) to slide the aileron and flap extension cord into the wing half.

Flap servo extension cord

Aileron servo extension

cord

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YAK-9

2- MAIN WING: Control horn & Linkages

Plastic control horn

............2 set

connector

2 mm

Flap push-rod

1.2x120mm

Secure the plastic control horn in place using the thin CA glue.

2 mm

Plastic control horn

............2 set

2x20mm screw

......4

Plastic EZ link

............2

Steel clevis

............2

Aileron push rod 2x175mm

.....2

Connector

2mm

............2

Flap push rod 1.2x120mm

............2

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YAK-9

3- MAIN WING: Joining the wing halves

Draw the center line on the wing joiner

6x20mm dowel.

Without using Epoxy yet, trial fit the wing joiner into one of the wing panels. Next, slide the other wing half onto the dihedral brace until the wing panels meet. If the fit is overly tight, it may be necessary to lightly sand the dihedral brace.

30 min. Epoxy

Coat one half of the dihedral brace with epoxy up to the center line. Install the epoxy-coated side of the dihedral brace into the wing joiner cavity up to the center line.

Carefully slide the wing halves together, ensuring that they are accurately aligned. Firmly press the two halves together, allowing the excess epoxy to run out. Using a paper towel, clean off the excess epoxy.

Hold the wing halves together with paper clamp and rubber band.

Nylon wing bolt (included)

Rubber band (not include)

Paper clamp (not include)

Securely glue together. If coming off during flight, you lose control of your air plane.

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YAK-9

4- MAIN WING: Fixed gear assembly

Main landing gear

3x20mm

Insert the main landing gear into the slot on the gear mount, if necessary, use sander to widen the slot to make this easier.

Ply gear mount plate x 2

Gear mount x 2

Nylon gear strap

3x12mm screw

.......4

.......8

Gear mount

Nylon gear strap

2mm

Ply gear mount flat

Square plastic

3x20mm

Square plastic x 2

3x12mm screw

3x20mm screw

......16

2mm

3x12mm screw

2mm

3x12mm screw

.........8

2mm

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YAK-9

5- MAIN WING: Wheel

Wheel well cover

Step 5A

Attach the plastic wheel well cover in place and secure it with litter CA glue or 2x8mm screws.

Step 5C

Step 5B

1.5mm

Plastic track

2x6mm screw

..........4

...2

4mm collar

....2

Step 5E

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YAK-9

6- MAIN WING: E-retract & strut

Note: Eretract and strut must be purchase separately

RETRACTED

www.motionrc.com

OFF

GEAR SWITCH

EXTENDED

Step 6A

Step 6C

Fix the strut on the adapter....

Step 6B

Fix the adapter in the retract with hexagon socket screws supplied with scale oleo strut.

Step 6D

...then tighten the locking bolt.

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YAK-9

7- MAIN WING: E-retract & strut

Step 7A

Step 7B

Drill appropriately sized holes for the hardware you intend to use (not supplied) then attach the retract in place (we recommend to use self tapping screws 3x15mm).

2mm

Step 7C

Slip the wheel on the axle with the circlip pointing away from the strut...

Step 7D

...then attach the axle to the gear and tighten the locking bolt (use LOCTITE threadlocker on every bolt).

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YAK-9

6x40mm nylon bolt

.........2

8- Attach the wing to the fuselage

Cut away only the covering

YAK-9

9- Air scoop

Thin CA

Apply the plastic air scoop (part B) in place and secure with CA glue.

Using the ABS air scoop (part A) as a template, trace around the outside edge of the ABS air-scoop and then remove it.

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YAK-9

10- Air scoop continued

YAK-9

Be cautious not to cut into the wood, this will weaken the structure.

11- Horizontal stabilizer

Thin CA

Using a sharp hobby knife, cut away the covering inside the lines. Not to cut into the wood.

Note: The hinges are glued to the elevator only.

Remove the left and right elevator out of the horizontal stabilizer before insert the horizontal stabilizer.

Insert the horizontal stabilizer into the slot on the fuselage, if necessary, use sander to widen the slot to make this easier.

Cut away only the covering

If the fit is overly tight, it may be necessary to lightly sand the top edge of the slot.

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YAK-9

12- Horizontal stabilizer continued

Cut away only the covering both side

90O90

A=A’ and B=B’

Check the alignment of the horizontal stabilizer When you are satisfied with the alignment (A=A’ and B=B’), use a pencil to trace around the top and bottom of the stabilizer where it meets the fuselage.

Remove the horizontal stabilizer from the fuselage. Using the sharp hobby knife, carefully cut away the covering inside the lines which were marked above.

A’

B’

Thin CA

Be cautious not to cut into the wood, this will weaken the structure.

Use a small glue faucet, Apply the thin CA glue on the horizontal stabilizer where it contacts the fuselage (both the top and bottom sides),and into the slot of the fuselage as show.

Securely glue together. If coming off during flight, you lose control of your air plane.

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YAK-9

Note: The hinges are glued to the rudder only.

90 degree measure

12- Vertical stabilizer

Check the alignment of the vertical stabilizer. When you are satisfied with the alignment, use a pencil to trace around the right and left of the stabilizer where it meets the fuselage.

Thin CA

Cut away only the covering both side

Remove the vertical stabilizer from the fuselage. Using the sharp hobby knife, carefully cut away the covering inside the lines which were marked above.

Be cautious not to cut into the wood, this will weaken the structure.

Use a small glue faucet, Apply the thin CA glue on the vertical stabilizer where it contacts the fuselage as show.

Securely glue together. If coming off during flight, you lose control of your air plane.

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YAK-9

Control horn

................3

2x12mm screw

..........6

13- Vertical stabilizer

Securely glue together. If coming off during flight, you lose control of your air plane.

Thin CA

2mm

Note: Push the elevator push-rod into the fuselage before attach the elevator control horn.

Elevator push rod

Elevator control horn flat

Elevator push rod

Elevator control horn flat

2mm

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YAK-9

14- Tail wheel

2x8mm screw

1- Insert the tail wheel pushrod into the hole on the tail gear control horn (as show).

2- Install the tail wheel control horn in place.

3- Instal the tail wheel gear in place.

4- Secure the tail wheel control horn in place using a 2mm screw set, Ensure smooth non-binding movement.

5- Installing the tail wheel hatch (H) in place using a four 2x10mm self tapping screws.

YAK-9

Pull the magnetic top hatch out of the fuselage.

15- Glow engine

2x3mm screw

............2

2x18mm screw

............4

Tail wheel controlhorn

.....1

1.2x800mm tail wheel push rod

2mm I.D collar

...............2

Tail landing gear

..........1

! Align the mark on both mounts with the mark on the fuselage

Attach the engine mount beams onto the fire-wall so the distance between of two engine mount beams is “A”. Secure the engine mount beams onto the fire-wall with litter CA glue.

Using a pencil or felt tipped pen, mark the fire wall where the four holes are to be drilled.

5mm

! Engine thrust on balk head is already adjust at factory

FRONT-VIEW

B’

B=B’

Remove the engine mount and drill a 5mm hole through the fire-wall at each of the four marks marked.

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YAK-9

16- Glow engine continued

127mm

4x25mm hex bolt

Blind-nut

4mm washer

Attach the four blind-nuts to the fire-wall as show,

then reposition the engine mounts on to the fire-wall and secure them with four 4x25mm hex bolts.

- Reposition the engine on to the engine mounts so the distance from the prop hub to the fire wall is 127mm

- Mark the engine mounting plate where the four holes are to be drilled. Note: Mark the mounting plate through the engine mounting flanges.

......4

............4

- Remove the engine and drill a 3mm holes through the beam at each of the four marks made above.

3mm

3x20mm hex bolt

Nut

- Reposition the engine on the engine mount beams, aligning it with the holes. Secure the engine to the engine mount using four 3x25mm screws.

...4

.............4

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YAK-9

17- Electric motor

! Align the mark on wooden motor mounting plate with the mark on the fire-wall.

Step 17A

Using a wooden motor mounting plate as a template, mark the fire-wall where the four holes are to be drilled.

Step 17B

Using a aluminum motor mounting plate as a template, mark the plywood motor mounting plate where the four holes are to be drilled.

Step 17C

3mm

Remove the aluminum motor mounting plate and drill a 1/8”(3mm) hole through the plywood at each of the four marks marked .

3mm bolt / nut...4

Step 17D

Remove the wooden motor mounting plate and drill a 6mm hole through the fire-wall at each of the four marks marked.

6mm

Attach the four 5x80mm bolts and nuts to the fire-wall as shown.

Step 17E

Secure the Motor to the wooden motor mounting plate using the four 3mm bolts.

5x80mm bolt....4

5mm nut.......12

5mm washer..16

Step 17G

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YAK-9

Rubber stopper

18- Fuel tank

To muffler

Filler tube

To engine

3x35mm screw

After confirming the direction . Insert this assembly, clunk end first, into the fuel tank and tighten and screw the fuel tankcap on firmly.

Ensure that the fuel tank clunk does not touch the rear of the fuel tank.

Blow

Water

Checking for leaks - block the vents and blow into the feed, if in doubt submersing the tank in a blow of water will show up any problems.

YAK-9

19- Cowling & Li-po battery tray

2.5x10mm.....4

1.5mm

Battery tray (3mm plywood)

Battery hatch

LiPo Battery

Battery stand

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YAK-9

NOTE: Place of the servos may be change depend of engine (Four-stoke or two-stroke engine)

20- Servo

YAK-9

Elevator servo

Rudder servo

Throttle servo

21- Linkages

Tail wheel push rod

Connector

Rudder servo

Rudder push rod

Rudder pushrod

Elevator servo

Tail wheel pushrod

Elevator push rod

Connector

Throttle push rod

Throttle servo (in case of glow engine using)

Note: Tighten all screws, if they rotate out, you will lose control your plane.

Use silicon sealer for all screws.

Elevator pushrod

Connector

........ 3

Connector

...... 1

2x950mm rod with clevis

........ 3 (Elevator x2 , Rudder x1)

1.5x120mm rod....1 (for Elevator linkage)

1.2x500mm rod....1 (for throttle, in case of

glow engine using)

1.2x800mm rod...1 (for tail wheel linkage)

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YAK-9

22- Balance

THE CENTER OF GRAVITY IS LOCATED 107mm BACK FROM THE LEADING EDGE OF THE WING, AT THE FUSELAGE. BALANCE A PLANE

UPSIDE DOWN WITH THE FUEL TANK EMPTY.

107mm

1- Mount the wing to the fuselage. Using a couple of pieces of masking tape,

place them on the top side of the wing (107mm) back from the leading edge, at the fuselage sides.

2- Lift the airplane. Place your fingers on the masking tape and carefully lift the plane.

3- If the nose of the plane falls, the plane is heavy nose. To correct this, move the battery pack further back in the fuselage. If the tail of plane falls, the plane is tail heavy. To correct this, move the battery forward or if this is not possible, stick weight onto the firewall. When balanced correctly, the airplane should level or slightly nose down when you lift it up with your fingers.

LATERAL BALANCE:

After you have balanced a plane on the CG, you should laterally balance it. Doing this will help the airplane track straighter.

1- Turn the airplane upside down. Attach one loop of heavy string to the engine crankshaft and one to the tail wheel wire. With the wing level, carefully lift the airplane by the string. This may require two people to make easier.

2- If one side of the wing fall, that side is heavier than the opposite. Add small amounts of lead weight to the bottom side of the lighter wing half’s wing tip. Follow this procedure until the wing stays level when you lift the airplane.

DO NOT try to fly an out-of-balance model !

YAK-9

23- Control surface

10mm

Position for right diagram

10mm

down

AILERON

RUDDER

15mm

down

FLAP

ELEVATOR

IMPORTANT: Flying your model at these throws will provide you with the greatest chance for successful first flights. If,after you have become accustomed to the way the Yak-9 flies, you would like to change the throws to suit your taste that is fine. However, too much control throw could make the model difficult to control, so remember, “more is not always better”.

25mm right

25mm

left

10mm

down

LOW RATE

Aileron : 10mm up / down Elevator : 10mm up / down Rudder : 25mm right / left Flap : 15mm down

HIGH RATE

Aileron : 12mm up / down Elevator : 12mm up / down Rudder : 30mm right / left Flap : 25mm down

IMPORTANT:

Please do not clean your model with pure alcohol, only use liquid soap with water or use glass cleaner to clean on surface of your model to keep the colour not fade.