INSTRUCTION MANUAL BOOK

SPECIFICATION

Made in Vietnam.

1 Wingspan : 1,400 mm 55 in.1 Length : 1,460 mm 57.5 in.1 Weight : 3.8 kg 8.4 lbs.

Parts listing required (not included):1 Engine : 61-.91cu.in 2 stroke; 120 cu.in 4 stroke.1 Radio : 04 channels.1 Servo : 06 servos.

ITEM CODE BH38.

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This instruction manual is designed to help you build a great flying aeroplane. Please read thismanual thoroughly before starting assembly of your ULTIMATE. Use the parts listing below toidentify all parts.

WARNING.

Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it iscapable of causing injury to people or property. WHEN YOU FLY THIS AEROPLANE YOUASSUME ALL RISK & RESPONSIBILITY.

If you are inexperienced with basic R/C flight we strongly recommend you contact your R/Csupplier and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of trainingprocedures designed to help the new pilot on his way to successful R/C flight. They will also be ableto advise on any insurance and safety regulations that may apply.

TOOLS & SUPPLIES NEEDED.

1 Thick cyanoacrylate glue.1 30 minute epoxy.1 5 minute epoxy.1 Hand or electric drill.1 Assorted drill bits.1 Modelling knife.1 Straight edge ruler.1 2mm ball driver.1 Phillips head screwdriver.1 220 grit sandpaper.1 90° square or builder’s triangle.1 Wire cutters.1 Masking tape & T-pins.1 Thread-lock.1 Paper towels.

Some more parts.

HARDWARE PACK

COWLINGLanding gear.....

To avoid scratching your new airplane, donot unwrap the pieces until they are neededfor assembly. Cover your workbench with anold towel or brown paper, both to protect theaircraft and to protect the table. Keep a coupleof jars or bowls handy to hold the small partsafter you open the bag.

Please trial fit all the parts. Make sure youhave the correct parts and that they fit and arealigned properly before gluing! This will assureproper assembly. ULTIMATE ARF is hand madefrom natural materials, every plane is uniqueand minor adjustments may have to be made.However, you should find the fit superior andassembly simple. The painted and plastic parts used in thiskit are fuel proof. However, they are not tolerantof many harsh chemicals including thefollowing: paint thinner, C/A glue accelerator,C/A glue debonder and acetone. Do not letthese chemicals come in contact with thecolors on the covering and the plastic parts.

PARTS LISTING.

FUSELAGE ASSEMBLY1 (1) Fuselage.

WING ASSEMBLY

1 (1) Right wing half with pre-installedaileron.

1 (1) Left wing half with pre-installedaileron.

Tail section assembly

1 (1) Vertical stabilizer with pre-installed rudder.

1 (1) Horizontal stabilizer with pre-installed elevator halves.

SUGGESTION.

NOTE.

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+ This is not a toy + Be sure that no other flyers are using yourradio frequency. + Do not smoke near fuel + Store fuel in a cool, dry place, away fromchildren and pets. + Wear safety glasses. +The glow plug clip must be securely attachedto the glow plug. + Do not flip the propeller with your fingers. + Keep loose clothing and wires away fromthe propeller. + Do not start the engine if people are near.Do not stand in line with the side of thepropeller. + Make engine adjustments from behind thepropeller only. Do not reach around thespinning propeller.

SAFETY PRECAUTION.

1 1. Install the rubber grommets and brasseyelets onto the aileron servo.

INSTALLING THE AILERON SERVOS.

Aileron.

Temporary pin tokeep hinge centered.

Assemble then apply drops of thinC/A to center of hinge,on both sides.

Cut the coveringaway from the slot.

Servo tray.

Bottom side.

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1 4. Install servo tray with aileron servo intothe wing as same as picture below.

1 2. Locate nylon control horns, nylon con-trol horn backplates and 3 machine screws.

Repeat the procedure for the right lowerwing half.

Wing. Servo tray.

1 1. Using a ruler & pen to draw a straightline as below picture.

Pen.

INSTALLING THE AILERON CONTROL HORN.

1 3. Using the thread as a guide and usingmasking tape, tape the servo lead to the endof the thread: carefully pull the thread out.When you have pulled the servo lead out,remove the masking tape and the servo leadfrom the thread.

1 2. Drill 1,5mm pilot holes through the blockof wood for each of the four mounting screwsprovided with the servo. Install servo into aileronservo tray as same as picture below:

Remove covering.

Aileron sero tray.

Bottom of left lower wing

Servo wire.

2x10mm.

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1 3. Drill three 3mm holes through the ai-leron using the control horn as a guide andscrew the control horn in place.

3x40mm.

Nilon control clasp.

M3 lock nut.

Drill 6mm a hole diameter.

1 4. Install control horn as same as picturebelow.

Bottom of left lower wing

Aileron control horn.

Control horn.

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1 4. Locate one nylon servo arm, and usingwire cutters,remove all but one of the arms.Using a 2mm drill bit, enlarge the third holeout from the center of the arm to accommodatethe aileron pushrod wire.

1 5. Using pliers, carefully make a 90 degreebend down at the mark made. Cut off the ex-cess wire, leaving about 4mm beyond thebend.

1 6. Insert the 90 degree bend down through the hole in the servo arm. Install one nylon snap keeper over the wire to secure it to the arm. Install the servo arm retaining screw and remove the masking tape from the aileron.

M2 lock nut.

M2 clevis. Snap keeper.

INSTALLING THE AILERON LINKAGES.

1 1. Working with the aileron linkage fornow, thread one nylon clevis onto one of thethreaded wires.

1 2. Attach the clevis to the outer hole in thecontrol horn. Install a silicone tube on theclevis.

1 3. Plug the aileron servo into the receiverand center the servo. Install the servo arm ontothe servo. The servo arm should beperpendicular to the servo and point towardthe middle of the wing.

C/A glue.

Repeat the procedure for the right lowerwing half.

bend.C/A glue.

Bottom of left lower wing

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245mm.

Stra

ight

line

Top of left lower wing

Top of left lower wing

Parts requirement. See pictures below:

Repeat the procedure for the right lowerwing half (bottom of right ).

WING STRUT INSTALLATION(LOWER WING).

25mm.Mark point

old straightline

Drill hole.

Top of left lower wing

Repeat the procedure for the right lowerwing half (Top of right ).

1 1. Locate the aluminium wing dihedralbrace.

1 2. Test fit the aluminium dihedral brace intoeach wing half. The brace should slide ineasily.

JOINING THE WING HALVES(LOWER MAIN WING).

Secure

Finishing

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Using a modeling knife, remove the cover-ing at possition show below.

Repeat the procedure for the left upperwing half (Bottom of left ).

Bottom size of upper wing

Remove the covering.

Parts requirement. See pictures below:

WING STRUT INSTALLATION(UPPER WING).

Dowel.

Bottom side of leftlower a wing.

245mm.

Straight line

Aluminium brace.Left Right

Top side of leftlower a wing.

Top side of rightlower a wing.

18mm.

Bottom side of rightupper wing

old straightline

Mark point

Drill hole.

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122mm.

4x30mm.

3.5x25mm.

INSTALLING THE ENGINE MOUNT.

Drill holes.

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Blow through one of the lines to ensurethe fuel lines have not become kinked insidethe fuel tank compartment. Air should flowthrough easily.

1 9. To secure the fuel tank in place, apply abead of silicon sealer to the forward area ofthe tank, where it exits the fuselage behind theengine mounting box and to the rear of the tankat the forward bulkhead.

1 8. Feed three lines through the fuel tankcompartment and through the pre-drilled holein the firewall. Pull the lines out from behindthe engine, while guiding the fuel tank intoplace. Push the fuel tank as far forward aspossible, the front of the tank should just abouttouch the back of the firewall.

Do not secure the tank into place perma-nently until after balancing the airplane. Youmay need to remove the tank to mount thebattery in the fuel tank compartment

INSTALLING THE STOPPER ASSEMBLY

1 1. The stopper has been pre-assembled at the factory.1 2. Using a modeling knife, cut one length ofsilicon fuel line (the length of silicon fuel line iscalculated by how the weighted clunk shouldrest about 8mm away from the rear of the tankand move freely inside the tank). Connect oneend of the line to the weighted clunk and theother end to the nylon pick up tube in thestopper.1 3. Carefully bend the second nylon tube upat a 45 degree angle (using a cigarette lighter).This tube will be the vent tube to the muffler.

1 4. Carefully bend the third nylon tube downat a 45 degree angle (using a cigarette lighter).This tube will be vent tube to the fueling valve.

FUEL TANK.

When the stopper assembly is installed inthe tank, the top of the vent tube should restjust below the top surface of the tank. It shouldnot touch the top of the tank.

1 5. Test fit the stopper assembly into thetank. It may be necessary to remove some ofthe flashing around the tank opening usinga modeling knife. If flashing is present, makesure none of it falls into the tank.1 6. When satisfied with the alignment of thestopper assembly tighten the 3mm x 20mmmachine screw until the rubber stopperexpands and seals the tank opening. Do notover tighten the assembly as this could causethe tank to split.1 7. Using a modeling knife, cut 3 lengths offuel line 150mm long. Connect 2 lines to the 2vent tubes and 1 line to the fuel pickup tube inthe stopper.

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1 1. Slide the fiberglass cowl over the en-gine and line up the back edge of the cowl withthe marks you made on the fuselage.

Locate the long piece of wire used for thethrottle pushrod. One end of the wire has beenpre-bend in to a “Z” bend at the factory. This“Z” bend should be inserted into the throttlearm of the engine when the engine is fitted ontothe engine mount. Fit the engine to the enginemount using the screws provided.

1 2. While keeping the back edge of thecowl flush with the marks, align the front ofthe cowl with the crankshaft of the engine. Thefront of the cowl should be positioned so thecrankshaft is in nearly the middle of the cowlopening. Hold the cowl firmly in place usingpieces of masking tape.

3x10mm.

Fuel tank.

Rubber band.

Pushrod wire.

COWLING.

1 3. Slide the cowl back over the engineand secure it in place using four screws. Seepicture below.

1 4. Install the muffler and muffler extensiononto the engine and make the cutout in thecowl for muffler clearance. Connect the fueland pressure lines to the carburetor, mufflerand fuel filler valve.

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Install the spinner backplate, propellerand spinner cone. The spinner cone is held inplace using two 3mm x 15mm wood screws.

1 1. Install the rubber grommets and brasscollets into the elevator, rudder, and throttleservos. Test fit the servos into the servo tray.

1 2. Mount the servos to the tray using themounting screws provided with your radiosystem.

INSTALLING THE SPINNER.

Machine screw.

Rudder servo.Throttleservo.

Eleva-torservo.

INSTALLLING THE FUSELAGE SERVO.

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Remove covering.

1 2. Draw a center line onto the horizontalstabilizer. Then slide the horizontal into thefuselage.

Remove covering.

1 1. Using a modeling knife, cut the cover-ing from the horizontal stabilizer and removeit.

HORIZONTAL STABILIZER.

Check to mark sure the wing and stabi-lizer are paralell. If they are not, lightly sandthe opening in the fuselage for the stabilizeruntil the stabilizer is paralell to the wing.

See pictures below:

Temporary pin tokeep hinge centered.

Assemble then apply drops of thinC/A to center of hinge,on both sides.

Cut the coveringaway from the slot.

Center line.

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VERTICAL STABILIZER.

Covered woodfiller piece.

1 5. When you are sure that everything isaligned correctly, mix up a generous amountof 30 minute epoxy. Apply a thin layer to thetop and bottom of the stabilizer mounting areaand to the stabilizer mounting platform sidesin the fuselage. Slide the stabilizer in place andre-align. Double check all of yourmeasurements one more time before theepoxy cures. Remove any excess epoxy usinga paper towel and rubbing alcohol and holdthe stabilizer in place with T-pins or maskingtape.1 6. After the epoxy has fully cured, re-

movethe masking tape or T-pins used to hold thestabilizer in place and carefully inspect theglue joints. Use more epoxy to fill in anygaps that were not filled previously andclean up the excess using a paper towel andrubbing alcohol.

Removecovering.

Hinge.

Pen.

1 3. Mark the shape of the vertical on the leftand right sides onto the horizontal stabilizerusing a felt-tip pen

1 4. Remove the stabilizer. Using the linesyou just drew as a guide, carefully remove thecovering from between them using a modelingknife.

When cutting through the covering toremove it, cut with only enough pressure toonly cut through the covering it’s self. Cuttinginto the balsa structure may weaken it. Thiscould lead to possible failure during flight.

Temporary pin tokeep hinge centered.

Cut the coveringaway from the slot.

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1 3. Mark the shape of the vertical on the leftand right side on the rudder using a felt-tippen.

1 1. Using a modeling knife, remove thecovering from over the precut hinge slot cutinto the rear portion of the fuselage. This slotaccepts the lower rudder hinge.

1 2. Slide the rudder into the fuselage as sameas picture below.

Hinge slot.

1 4. Now, remove the rudder and using amodeling knife, carefully cut just inside themarked lines and remove the film of the rudder.Just as you did with the horizontal stabilizer,make sure you only press hard enough to cutthe film, not the balsa rudder.

Pen.

C/A glue.

Assemble then apply drops of thinC/A to center of hinge,on both sides.

1 5. Slide the vertical stabilizer back inplace. Using a triangle, check to ensurethat the vertical stabilizer is aligned 90 degreeto the horizontal stabilizer.

Remove covering.

1 6. When you are sure that everything is aaligned correctly, mix up a generous amountof 30 minute epoxy. Apply a thin layer to theslot in the mounting platform and to the verticalstabilizer mounting area. Apply epoxy to thelower rudder hinge. Set the stabilizer in placeand re-align. Double check all of yourmeasurements once more before the epoxycures. Remove any excess epoxy using apaper towel and rubbing alcohol and hold thestabilizer in place with T-pins or masking tape.Allow the epoxy to fully cure before proceeding.

90º

VerticalStabilizer.Horizontal

Stabilizer.

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Epoxy glue.

Drill 6mm a hole of the mounting ruddercontrol horn on to the rudder with 6mmdiameter.

Rudder control horn install as same as theway of aileron control horn. Please see picturesbelow.

A. RUDDER:

CONTROL HORN - PUSHRODINSTALLATION.

C/A glue.

M3 lock nut.Niloncontrol clasp.

3mmx40mm.

Drill a hole3mm diameter.

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Rudder cable. Rudder cable.

Ruddercontrol horn.

Rudder control horn.

B. ELEVATOR:

Elevator control horn install as same as pic-tures below.

Control horn of elevator

3mm x 40mm.

M3 lock nut.Niloncontrol clasp.

Mark point

Drill 1 hole with 6 mm diameter.

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Elevator pushrod.

Bend and Cut

Elevator pushrod.

C/A glue.

Elevator control horn.

Elevatorpushrod.

Elevatorpushrod.

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Snap keeper.

Throttle servo.

Rudder servo.Throttle.

Elevatorservo.

Elevatorservo.

Install one adjustable metal connectorthrough the third hole out from the center ofone servo arm, enlarge the hole in the servoarm using a 2mm drill bit to accommodate theservo connector. Remove the excess materialfrom the arm.

After installing the adjustable metalconnector apply a small drop of thin C/A tothe bottom nut. This will prevent the connectorfrom loosening during flight.

Servo arm.

Connector.

INSTALLING THE THROTTLEPUSHROD.

Cut

Throttlepushrod

1 2. Using a pen, mark the locations of thetwo mounting screws. Remove the tail wheelbracket and drill 1mm pilot holes at the loca-tions marked.

1 1. Set the tail wheel assembly in placeon the plywood plate. The pivot point of thetail wheel wire should be even with the rud-der hinge line and the tail wheel bracket shouldbe centered on the plywood plate.

MOUNTING THE TAIL WHEEL BRACKET.

1 3. Secure the tail wheel bracket in placeusing three 3mm x 12mm wood screws. Becareful not to overtighten the screws.

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1 1. Cut out the switch hole using a modelingknife. Use a 2mm drill bit and drill out the twomounting holes through the fuselage side.

1 2. Secure the switch in place using thetwo machine screws provided with the radiosystem.

INSTALLING THE SWITCH.

1 2. A drop of C/A glue on the wheel collarscrews will help keep them from coming loseduring operation.

1 1. Assemble and mounting the wheel pantsas shown in the following pictures.

INSTALLING THE MAIN LANDINGGEAR.

1 3. The blind nuts are already mounted in-side the fuselage.

1 4. The holes in the landing gear should beto accept the mounting bolts.

Repeat the process for the other wheel.

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1 1. Plug the servo leads and the switchlead into the receiver. You may want to plugan aileron extension into the receiver to makeplugging in the aileron servo lead easierwhen you are installing the wing . Plug thebattery pack lead into the switch.

1 2. Wrap the receiver and battery pack inthe protective foam to protect them fromvibration. Use a rubber band or masking tapeto hold the foam in place.1 3. Position the battery pack and receiverbehind the fuel tank. Use the two light plywoodpieces, placed over the battery and receiver

Switch.

and glue to the fuselage sides to hold thebattery and receiver securely in place. Use15mm triangle pieces glued between thefuselage sides and the plywood pieces toreinforce the joints.

Do not permanently secure the receiver andbattery until after balancing the model.

1 4. Using a 2mm drill bit, drill a hole throughthe side of the fuselage, near the receiver, forthe antenna to exit.

INSTALLING THE RECEIVER AND BATTERY.

3x15mm.

WING JOINING.LOWER MAIN WING.

C/A glue.

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Lower wing.

Secure

Lower wing.

Remove covering

3x15 mm.

Upper wing.

Secure.

Lower wing.

Bottomside.

Right Left

Bottom side of upper wing

3 x 15mm.

Secure.

Wing bolt.

Wing attach to fuselage.

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Lower wing.

Lower wing.

Lower wing.

Top side upper wing

Upper wing .

Top side lower wing

Top side upper wing

1 3. Turn the airplane upside down. Placeyour fingers on the masking tape and carefullylift the plane .

1 1) It is critical that your airplane be bal-anced correctly. Improper balance will causeyour plane to lose control and crash.

THE CENTER OF GRAVITY IS LOCATED100-105mm BACK FROM THE LEADINGEDGE OF THE WING.

1 2) Mount the wing to the fuselage. Using acouple of pieces of masking tape, place themon the top side of the wing 100-105 mm backfrom the leading edge, at the fuselage sides.

BALANCING.

With the wing attached to the fuselage, allparts of the model installed ( ready to fly), andempty fuel tanks, hold the model at themarked balance point with the stabilizer level.

Lift the model. If the tail drops when youlift, the model is “tail heavy” and you must addweigh* to the nose. If the nose drops, it is “noseheavy” and you must add weight* to the tail tobalance.

Accurately mark the balance point on the topof the wing on both sides of the fuselage. Thebalance point is located 100-105mm back fromthe leading edge. This is the balance point atwhich your model should balance for your firstflights. Later, you may wish to experiment byshifting the balance up to 10mm forward orback to change the flying characteristics. Mov-ing the balance forward may improve thesmoothness and arrow- like tracking, but it maythen require more speed for take off and makeit more difficult to slow down for landing.Moving the balance aft makes the model moreagile with a lighter and snappier ”feel”. In anycase, please start at the location werecommend .

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1 1. Completely charge your transmitter andreceiver batteries before your first day of flying.

1 2. Check every bolt and every glue joint inyour plane to ensure that everything is tightand well bonded.

1 3. Double check the balance of theairplane.

1 4. Check the control surface.

1 5. Check the receiver antenna . It shouldbe fully extended and not coiled up inside thefuselage.

1 6. Properly balance the propeller.

We wish you enjoy.

Ailerons : 20mm up 20mm down Elevator : 30mm up 30mm down Rudder : 30mm right 30mm left

1 1. We highly recommend setting up a planeusing the control throws listed.

1 2. The control throws should be measuredat the widest point of each control surface.

1 3. Check to be sure the control surfacesmove in the correct directions.

CONTROL THROWS.

Aileron Control

PRE-FLIGHT CHECK.

*If possible, first attempt to balance the modelby changing the position of the receiverbattery and receiver. If you are unable to obtaingood balance by doing so, then it will benecessary to add weight to the nose or tail toachieve the proper balance point.

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