instruction manual book - blackhorsemodel · b-25j mitchell.instruction manual 2 this instruction...

SPECIFICATION Wingspan : 1,590mm 62.60 in. Length : 1,230 mm 48.43 in. Weight : 2.8 kg 6.16 Lbs. Radio : 06-7 channels. Servo : 08-10 servos.

Parts listing required : Electric Motor : ( 02pcs ) + AXI 2814/12.

+ KMS 2814/08 Battery: 3 CELLS-LI-POLY

11.1V-4,500 mA.h-20c. Speed control : ( 02pcs ) : 40 A Engine (02PCS) : 25 -2 stroke. Propeller : 9 x 6

Instruction Manual book

Made in Vietnam.

ITEM CODE: BH51.

B-25J MITCHELL . Instruction Manual

2

This instruction manual is designed to help you build a great flying aeroplane. Please read thismanual thoroughly before starting assembly of your B-25J MITCHELL. Use the parts listing belowto identify 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/C supplierand 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.

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

Some more parts.

HARDWARE PACK

COWLING.Landing gear.....

To avoid scratching your new airplane, do notunwrap the pieces until they are needed forassembly. Cover your workbench with an oldtowel or brown paper, both to protect the air-craft and to protect the table. Keep a couple ofjars or bowls handy to hold the small parts af-ter you open the bag.

Please trial fit all the parts. Make sure you havethe correct parts and that they fit and arealigned properly before gluing! This will assureproper assembly. B-25J MITCHELL ARF ishand made from natural materials, every planeis unique and minor adjustments may have tobe made. However, you should find the fit su-perior and assembly simple.The painted and plastic parts used in this kitare fuel proof. However, they are not tolerantof many harsh chemicals including the follow-ing: paint thinner, C/A glue accelerator, C/A gluedebonder and acetone. Do not let these chemi-cals come in contact with the colors on thecovering and the plastic parts.

PARTS LISTING.

FUSELAGE ASSEMBLY(1) Fuselage.

WING ASSEMBLY

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

Tail section assembly

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

SUGGESTION.

NOTE.

B-25J MITCHELL. INSTRUCTION MANUAL

3

+ This is not a toy+ Be sure that no other flyers are using yourradio frequency. +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 st art the motor if people are near .Do not stand in line with the side of the propel-ler.

SAFETY PRECAUTION.Caution: this model is not a toy!If you are a beginner to this type of poweredmodel, please ask an experienced model flyerfor help and support. If you attempt to operatethe model without knowing what you are doingyou could easily injure yourself or somebodyelse. Please keep your safety and well-beingin mind at all times.

Important: before you start constructionEven if you have already built a large numberof RC models please read right through theseinstructions and check all the kit componentsagainst the parts list. We have taken greattrouble to keep construction as simple aspossible, without making any compromisesin the area of safety.

Note regarding the film coveringMinor creases or bubbles may develop in thefilm covering due to major fluctuations inweather conditions (temperature, humidityetc.); in rare cases you may even find a slightwarp in a component. These minor faults arein the nature of film-covered built-up woodenstructures, and can easily be corrected usinga heat gun, as commonly used for modelling.Creases: Blow warm air over the area

and rub down with a softcloth.

Wing warp: Hold the panel twistedgently in the oppositedirection to the warp, andapply warm air to removethe creases from thecovering.

Caution! do not heat the film more than isabsolutely necessary. If the air or the iron istoo hot, the film may melt and holes may beformed.

This model is highly pre-fabricated and canbe built in a very short time. However, the workwhich you have to carry out is important andmust be done carefully . The model will onlybe strong and fly well if you complete yourtasks competently - so please work slowlyand accurately.

When self-tapping screws have to bescrewed into wood, apply a little whiteglue to prevent them shaking loose: justsquirt white glue into the hole and fit thescrew.

REPLACEMENT LARGE PARTS

REPLACEMENT SMALL PARTS

A. Wing panel.

B. Fuselage.C. Horizontal stabilizer.

D. Vertical stabilizer.

1. Cowling.3.Guns & Radiator.

2.Gun turret.

4. Retractable landing gear and retractablenose gear.5. Wheels.

E. Decal sheet.

6. Radiator.7. Top fuselage hatch.

1

1

2

3 2

4

6

7

F. Aluminium wing dihedral brace.

A

AB

CD

E

F

5

8.Font Greenhouse Canopy .

8

9

9.Main Cockpit canopy .


4

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

2) Install the metal connector onto servoarm.

INSTALLING THE AILERON - FLAP SERVOCONTROL HORN.

INSTALLING THE AILERON - SERVO CONTROL HORN.

C/A glue.

C/A glue.

Bottom side of left wing.

Flap FlapAileron

Epoxy gue

C/A glue.C/A glue.


5

Epoxy glue.

C/A glue

Bottom side of leftwing.

3) Install the aileron servo as same aspicture.

Remove covering

ThreadElectric wire

Thread


6

4) Attach the micro control connector tothe servo arms. Be sure to use the lock tie butit could free rotation.

Micro controlconnector.

CONTROL HORN OF THE AILERON

Bottom side.

Aileron

Flap

Insert aileron control horn to the aileron.

Remove the covering to pre-cut slot of aileronas picture below.

58mm

Pushrod wire

aileron control horn. Flap control horn.

aileron control horn.

C/A glue

C/A glue


7

Aileroncontrol horn

Secure

Aileron

Secure

Remove the covering to pre-cut slot of flap aspicture below.

INSTALLING FLAP SERVO-CONTROL HORN.

Remove covering

Flap

Bottom side

Installing the flap servo as picture below.


8

CONTROL HORN OF THE FLAP

Flap control horn

Pushrod wire

Insert flap control horn to the flap as picturebelow.

C/A glue

Secure

Cut


9

Repeat the procedure for the otherwing half.

See pictures below

THERE ARE TWO OPTIONS: 1. ELECTRIC MOTOR. 2. ENGINE MOUNT.

1. ELECTRIC MOTOR.

INSTALLING THE ENGINE MOUNT.

4.5mm

3x 15mm.


10


11

C/A glue

Epoxy glue.

balsa wood piece

C/A glue

C/A glue


12

INSTALLING RETRACTABLE LANDINGGEAR

3 x 12mm

3 x 15mm

Mark point

Drill 2mm hole

Top side

Bottom side


13

Secure

3 x 12mm


14

Retract landinggear pushrod

Mark point

Secure

Cut

Top side


15

Top side of left haft wing

Top side of left haft wing

Top side

Bottom side of left haft wing

Mark point

Remove covering onto pre-cut slot of hole


16

Install the engine cowl as same as picturebelow.

ENGINE COWLING INTALLATION.

Ply wood piece

Center line

Bottom side

Secure the wing to the bottom nacelle

Cowling

Bottom nacellePly wood piece

25 mm

C/A glue

3 x 12 mm

Epoxy glue


17

Cut nacelle as picture below.

Cut

Push

Mark line 1

Left side

Left nacelle

Right nacelle

Top side

Mark line 2

Left side


18

Line 2Line 1

Mark line 3Right side

Mark line 4

Right side

Right side

Line 3Line 4

C/A glue

C/A glue


19

C/A glue

Line 1Line 2

Line 3Line 4

Mark point

Push downand push on

Repeat procedure for the other wing panel.

Secure

Drill 4mm a hole diameter


20

Secure

Secure

2. OPTION 2: ENGINE MOUNT.

Draw the straight lineas picture below.


21

Saw cross - cut and remove the balsa ply-wood as picture below.

Mark point

C/A glue

Epoxy glue

balsa wood piece


22

3x20mm3x20mm

Secure

FUEL TANK.

Vent tube

Fuel fill tube

Fuel pick - up tube

Tie wrap.


23

Tie wrap.

92mm

Drill 2mm hole

Mark point Secure

Throttle pushrod


24

Secure

Cut

Throttle servo

Throttle pushrod


25

Repeat the procedure for the other winghalf.

Bottom side

Trim and cut


26

Secure

Secure

INSTALLING RETRACT NOSE GEAR.

3 x 12mm

Secure


27

Cut

Epoxy glue

C/A glue

C/A glue


28

1) Install the rubber grommets and brasseyelets onto the elevator servo and nose gearservo.

2) Install the metal connector onto servoarm.

Servo for retract only

RETRACTABLE INSTALLATION

SERVO INSTALLATION.

servo for retract

Cut

Secure

Nose gear servo


29

Servo armof retracts.

Metal conector

25mm

15mm

Retracts pushrod system


30


31

VERTICAL INSTALLATION.

HORIZONTAL VERTICAL STABILIZER IN-STALLATION.

Elevator servo

Elevator pushrod

C/A glue

C/A glue

C/A glue

Top

Remove covering

Bottom


32

Remove covering


33

C/A glue

Mark point

Secure

A hole 2.5mmdiameter.


34

C/A glue

Mark point

Removecovering


35

Epoxy glue

90 - degree

C/A glue

C/A glue

Top

Bottom

C/A glue


36

C/A glue

C/A glue


37

Secure

Cut

HORIZONTAL INSTALLATION.


38

90º

VerticalStabilizer.Horizontal

Stabilizer.

Install the elevator pushrod- elevator controlhorn as picture below.


39

Secure

Elevatorcontrol horn .



Elevator servo.

Elevator pusrod

Cut


40

See pictures below:

ATTACHMENT WING-FUSELAGE.

Secure

Secure

Cut


41

INSTALLING THE RECEIVER ANDBATTERY.

battery

See picture below.

Nose gear servo

Tie wrap.

Elevator servo

Battery


42

Cut

Radiator.


43

C/A glue


44


45


46

3. Turn the airplane up side down. Placeyour fingers on the masking tape and care-fully lift the plane .

1) It is critical that your airplane be bal-anced correctly. Improper balance will causeyour plane to lose control and crash.THE CENTER OF GRA VITY IS LOCA TED95MM BACK FROM THE LEADING EDGEOF THE WING.

2) Mount the wing to the fuselage. Using acouple of pieces of masking tape, place themon the top side of the wing 95 mm back fromthe leading edge, at the fuselage sides.

BALANCING.

Accurately mark the balance point on the topof the wing on both sides of the fuselage. Thebalance point is located 95mm back from theleading edge. This is the balance point at whichyour model should balance for your first flights.Later, you may wish to experiment by shiftingthe balance up to 10mm forward or back tochange the flying characteristics. Moving thebalance forward may improve the smooth-ness and arrow- like tracking, but it may thenrequire more speed for take off and make itmore difficult to slow down for landing. Movingthe balance aft makes the model more agilewith a lighter and snappier ”feel”. In any case,please start at the location we recommend . 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.

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

CG95mm


47

1) We highly recommend setting up aplane using the control throws listed.

2) The control throws should be meas-ured at the widest point of each control sur-face.

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

CONTROL THROWS.

Ailerons : 12mm up 12mm down. Elevator : 18mm up 18mm down. Rudder : 20mm right 20mm left.

1) Completely charge your transmitter andreceiver batteries before your first day of fly-ing.

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

3) Double check the balance of theairplane.

4) Check the control surface.

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

6) Properly balance the propeller.

PRE-FLIGHT CHECK.

We wish you many safe and enjoyableflights with your B25-MITCHELL.

Aileron Control

12

12

1818

2020

instruction manual book - blackhorsemodel · b-25j mitchell.instruction manual 2 this instruction...

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