Black Horse Model Pitts BH85-A Bedienungsanleitung

Instruction Manual book

Made in Vietnam.

Item code: BH85-A.

95% ALMOST READY TO FLY

ALL BALSA - PLY WOOD CONSTRUCTION.

COVERED WITH ORACOVER.

 Wingspan: 1,500mm 59.06 in).

 Length: 1,330mm (52.36 in).

 Weight: 4.7kg (10.34 lbs).

 Wing area: 74dm2.

 Wing loading: 64 g/dm2.

 Wing type: Naca Airfoil.

 Gear type: Aluminium Hi-grade for

main gear and spring wire for tail gear

(included).

Parts listing required (not included).

 Radio: 06 channels.

SPECIFICATION

PITTS

 Servo: 07 servos.

 Servo mount: 42mm x 21mm.

 Engine: 120 - 2 stroke; O.S.GT 22cc Gas.

 Motor: Brushless outrunner 1800-2300W, 450KV.

 Propeller: Suit with your engine.

Recommended motor and battery set up (not included):

 Motor: RIMFIRE.120.

 Lipo cell: 6 cells 4,000-5,000mAh.

 ESC: 80A.

 Receiver battery: 4.8-6V/ 1200-2000mAh NiMH.

New improvement.

PITTS Item code: BH85-A Instruction Manual

Some more parts.

HARDWARE PACK

COWLING.

Landing gear.....

This instruction manual is designed to help you build a great ying aeroplane. Please read this manual thoroughly

before starting assembly of your PITTS. Use the parts listing below to identify all parts.

Please trial fit all the parts. Make sure you have

the correct parts and that they t and are aligned

properly before gluing! This will assure proper

assembly. PITTS ARF is hand made from natural materi-

als,everyplaneisuniqueandminoradjustmentsmayhave

to be made. However, you should nd the t superior and

assembly simple.

The painted and plastic parts used in this kit are fuel

proof. However, they are not tolerant of many harsh

chemicals including the following: paint thinner, C/A

glue accelerator, C/A glue debonder and acetone. Do

not let these chemicals come in contact with the colors

on the covering and the plastic parts.

FUSELAGE ASSEMBLY

(1) Fuselage.

WING ASSEMBLY

(1) Right wing half with pre-installed aileron.

(1) Left wing half with pre-installed aileron.

TAIL SECTION ASSEMBLY

(1) Vertical stabilizer with pre-installed rud-

der.

(1) Horizontal stabilizer with pre-installed

elevator halves.

To avoid scratching your new airplane, do not

unwrap the pieces until they are needed for

assembly. Cover your workbench with an old towel or

brown paper, both to protect the aircraft and to protect

the table. Keep a couple of jars or bowls handy to hold

the small parts after you open the bag.

SUGGESTION

NOTE

Please be aware that this aeroplane is not a toy and if assembled or used incorrectly it is capable of causing

injury to people or property. WHEN YOU FLY THIS AEROPLANE YOU ASSUME ALL RISK & RESPONSIBILITY.

If you are inexperienced with basic R/C ight we strongly recommend you contact your R/C supplier and join your

local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training procedures designed to help the new

pilot on his way to successful R/C ight. They will also be able to advise on any insurance and safety regulations

that may apply.

WARNING

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.

TOOLS & SUPPLIES NEEDED

PARTS LISTING

PITTS Item code: BH85-A Instruction Manual

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 y well if you complete

your tasks competently - so please work slowly and

accurately.

When self-tapping screws have to be screwed into

wood, apply a little white glue to prevent them

shaking loose: just squirt white glue into the hole

and t the screw.

Caution: This model is not a toy!

If you are a beginner to this type of powered model,

please ask an experienced model yer for help and

support. If you attempt to operate the model without

knowing what you are doing you could easily injure

yourself or somebody else. Please keep your safety

and well-being in mind at all times.

Important: Before you start construction

Even if you have built a large number of RC models

please read right through these instructions and check

all the kit components against the parts list. We have

taken great trouble to keep construction as simple as

possible, without making any compromises in the area

of safety.

Note regarding the lm covering

Minor creases or bubbles may develop in the lm

covering due to major uctuations in weather conditions

(temperature, humidity etc.); in rare cases you may

even nd a slight warp in a component. These minor

faults are in the nature of lm-covered built-up wooden

structures, and can easily be corrected using a heat

gun, as commonly used for modelling.

Creases: Blow warm air over the area and rub

down with a soft cloth.

Wing wrap: Hold the panel twisted gently in

the opposite direction to the wrap,and

apply warm air to remove the creases

from the covering.

Caution! do not heat the lm more than is absolutely

necessary. If the air or the iron is too hot, the lm may

melt and holes may be formed.

+ This is not a toy.

+ Be sure that no other yers are using your radio

frequency.

+ Do not smoke near fuel.

+ Store fuel in a cool, dry place, away from children

and pets.

+ Wear safety glasses.

+The glow plug clip must be securely attached to the

glow plug.

+ Do not ip the propeller with your ngers.

+ Keep loose clothing and wires away from the propel-

ler.

+ Do not start the engine if people are near. Do not

stand in line with the side of the propeller.

+ Make engine adjustments from behind the propeller

only. Do not reach around the spinning propeller.

SAFETY PRECAUTION

REPLACEMENT LARGE PARTS

A: Cowling.

B: Wing panel (B1, B2, B3, B4).

C: Fuselage - Vertical stab set.

D: Horizontal stabilizer.

E: Rudder.

F. Aluminium wing dihedral brace.

G: Decal sheet.

K: Pilot.

PITTS Item code: BH85-A Instruction Manual

 1) Install the rubber grommets and brass

eyelets on to the aileron servos.

 2) Using a modeling knife, remove the

covering from over the pre-cut servo arm exit hole on

the aileron servo tray / hatch. This hole will allow the

servo arm to pass through when installing the aileron

pushrods.

2. INSTALLING THE AILERON SERVOS

Assemble then apply drops of thin

C/A to center of hinge,on both sides.

Temporary pin to

keep hinge centered.

1. INSTALLING THE AILERONS

I. AILERON

Test t the ailerons to the wing with the hinges. If the

hinges don’t remain centered, stick a pin through the

middle of the hinge to hold it in position.

Servo tray

Remove the covering

REPLACEMENT SMALL PARTS

Aileron

Bottom side.

1. Plastic - engine mount.

2. Wheels.

3. Wheel pants (left & right).

4. Aluminium landing gear.

5. Wing strut.

7. Tail gear set.

8. Fuel Tank

9. Spinner.

2x10mm

3x12mm

3 x 15mm

4x30mm

4x20mm 5x45mm

4x70mm

4x30mm

3x10mm

3x25mm

PITTS Item code: BH85-A Instruction Manual

3) Using the thread as a guide and using mask-

ing tape, tape the servo lead to the end of the thread:

carefully pull the thread out. When you have pulled the

servo lead out, remove the masking tape and the servo

lead from the thread.

Drill a hole

1.5mm

Secure

Electric wire

 4) Place the servo into the servo tray. Center

the servo within the tray and drill 2.5mm pilot holes

through the block of wood for each of the four mount-

ing screws provided with the servo.

Electric wire

Drill a hole

1.5mm

2x10mm

Secure

 5) Repeat the procedure to install the aileron

servos in the other wing half.

3. INSTALLING THE AILERON CONTROL HORN

 1) Remove the covering from the slot on the bot-

tom of the aileron.

 2) Insert the control horn into the slot and secure

it by A+B Epoxy glue.

1. A+B Epoxy glue

2. Push in

Aileron

control horn

4. INSTALLING THE AILERON LINKAGES

 3) Repeat the procedure to install the

control horn on the other aileron.

Installing the aileron linkages as pictures below.

100mm

Snap keeper.

M2 lock nut

Bend

Silicone tube

PITTS Item code: BH85-A Instruction Manual

Repeat the procedure to install the other aileron

linkages in the other wing half.

After both linkages are completed. connect both of

the aileron servo loads using a Y-harness you have

purchased.

Using pliers, carefully make a 90 degree bend down at

the mark made. Cut off the excess wire, leaving about

6mm beyond the blend.

Flaslink

Pushrod wire Control horn

Repeat the procedure to install the opposite wing

half.

See pictures below:

II. INSTALLING THE ENGINE MOUNT

OPTION 1: ELECTRIC MOTOR

There are two options:

1. Electric motor

2. Engine mount.

Drill a hole

5.2mm diameter

Cut.

4x70mm

4x30mm

Insert the 90 degree bend down through the hole in the

control horn. Install one nylon snap keeper over the

wire to secure it to the control horn. Install the control

horn retaining screw and remove the masking tape

from the aileron.

PITTS Item code: BH85-A Instruction Manual

Locate the long piece of wire used for the throttle push-

rod. One end of the wire has been pre-bend in to a “Z”

bend at the factory. This “Z” bend should be inserted

into the throttle arm of the engine when the engine is

tted onto the engine mount. Fit the engine to the engine

mount using the screws provided.

OPTION 2: ENGINE MOUNT

4x30mm

1. INSTALLING THE STOPPER ASSEMBLY

1) The stopper has been pre-assembled at the

factory.

2) Using a modeling knife, cut one length of silicon

fuel line (the length of silicon fuel line is calculated by

how the weighted clunk should rest about 8mm away

from the rear of the tank and move freely inside the

tank). Connect one end of the line to the weighted

clunk and the other end to the nylon pick up tube in

the stopper.

3) Carefully bend the second nylon tube up at a 45

degree angle (using a cigarette lighter). This tube will

be the vent tube to the mufer.

4) Carefully bend the third nylon tube down at a 45

degree angle (using a cigarette lighter). This tube will

be vent tube to the fueling valve.

When the stopper assembly is installed in the tank, the

top of the vent tube should rest just below the top sur-

face of the tank. It should not touch the top of the tank.

III. FUEL TANK

To carburetor

fuel inlet

Atter conrming the direction

(see front view of fuel tank). Insert and tighten the screw.

Be sure to equip

air vent pipe.

Tubing for

re-fuelling

Not included.

Tygon tubing (Gas). And

silicone tubing (Methanol).

5mm

Throttle pushrod

PITTS Item code: BH85-A Instruction Manual

5) Test t the stopper assembly into the tank. It may

be necessary to remove some of the ashing around

the tank opening using a modeling knife. If ashing is

present, make sure none of it falls into the tank.

6) When satised with the alignment of the stopper

assembly tighten the 3mm x 20mm machine screw until

the rubber stopper expands and seals the tank opening.

Do not over tighten the assembly as this could cause

the tank to split.

7) Using a modeling knife, cut 3 lengths of fuel line

150mm long. Connect 2 lines to the 2 vent tubes and 1

line to the fuel pickup tube in the stopper.

8) Feed three lines through the fuel tank

compartment and through the pre-drilled hole in the

rewall. Pull the lines out from behind the engine, while

guiding the fuel tank into place. Push the fuel tank as

far forward as possible, the front of the tank should just

about touch the back of the rewall.

Blow through one of the lines to ensure the fuel lines

have not become kinked inside the fuel tank compart-

ment. Air should ow through easily.

9) To secure the fuel tank in place, apply a bead of

silicon sealer to the forward area of the tank, where it

exits the fuselage behind the engine mounting box and

to the rear of the tank at the forward bulkhead.

Do not secure the tank into place permanently until after

balancing the airplane. You may need to remove the

tank to mount the battery in the fuel tank compartment.

Pushrod wire

Install one adjustable metal connector through the third

hole out from the center of one servo arm, enlarge the

hole in the servo arm using a 2mm drill bit to accommo-

date the servo connector. Remove the excess material

from the arm.

After installing the adjustable metal connector apply

a small drop of thin C/A to the bottom nut. This will

prevent the connector from loosening during ight.

2. INSTALLING THE THROTTLE PUSHROD

IV. COWLING

1) Slide the berglass cowl over the engine and

line up the back edge of the cowl with the marks you

made on the fuselage.

2) While keeping the back edge of the cowl ush

with the marks, align the front of the cowl with the

crankshaft of the engine. The front of the cowl should

be positioned so the crankshaft is in nearly the middle

of the cowl opening. Hold the cowl rmly in place using

pieces of masking tape.

Fuel tank

Tie wrap

Cut

Throttle pushrod

Throttle servo

Secure

Connector

Servo arm

Cowl area cutout

for mufer

Cowl area cutout

for engine head.

PITTS Item code: BH85-A Instruction Manual

5) Drill four 2.5mm pilot holes through both the

cowl and the side edges of the rewall.

Using a 3mm drill bit, enlarge the four holes in the

cowling.

1) Elevator install as same as the way of aileron.

Please see pictures below.

V. INSTALLING HORIZONTAL

STABILIZER

2) Using a modeling knife, cut away the cov-

ering from the fuselage for the stabilizer and

remove it.

3) Draw a center line onto the horizontal stabilizer.

Then put the horizontal into the fuselage.

4) Check the t of the horizontal stabilizer in its

slot. Make sure the horizontal stabilizer is square and

centered to the fuselage by taking measurements, but

don’t glue anything yet.

B B

A A

3) Slide the cowl back over the engine and secure

it in place using four wood screws. See picture below.

4) Install the mufer and mufer extension onto

the engine and make the cutout in the cowl for mufer

clearance. Connect the fuel and pressure lines to the

carburetor, mufer and fuel ller valve.

Drill a hole

2.5mm

3x12mm Secure

5) With the horizontal stabilizer correctly aligned,

mark the shape of the fuselage on the top and bottom

of the tail plane using a water soluble / non permanent

felt-tip pen.

Check to mark sure the wing and stabilizer are

paralell. If they are not, lightly sand the opening

in the fuselage for the stabilizer until the stabilizer

is paralell to the wing, but don’t glue anything yet.

A A

A = A

Push in

Top side

Mark line

PITTS Item code: BH85-A Instruction Manual

6) When you are sure that everything is aligned

correctly, mix up a generous amount of 30 minute

epoxy. Apply a thin layer to the top and bottom of the

stabilizer mounting area and to the stabilizer mounting

platform sides in the fuselage. Slide the stabilizer in

place and re-align. Double check all of your measure-

ments one more time before the epoxy cures. Remove

any excess epoxy using a paper towel and rubbing

alcohol and hold the stabilizer in place with T-pins or

masking tape.

5) Remove the stabilizer. Using the lines you just

drew as a guide, carefully remove the covering from

between them using a modeling knife.

When cutting through the covering to remove it, cut

with only enough pressure to only cut through the

covering it’s self. Cutting into the balsa structure may

weaken it. This could lead to possible failure during

ight.

Remove

the covering.

Bottom side.

control horn

1. A+B Epoxy glue

2. Push in

Elevator control horn

Drill a hole

1.5 mm

ELEVATOR CONTROL HORN

INSTALLATION

Elevator control horn install as same as the way of

aileron control horn. Please see pictures below.

After the epoxy has fully cured, remove the mask-

ing tape or T-pins used to hold the stabilizer in place

and carefully inspect the glue joints. Use more epoxy

to ll in any gaps that may exits that were not lled

previously and clean up the excess using a paper tow-

el and rubbing alcohol.

Bottom side.

Mark line.

Top side

A/B Epoxy glue

Bottom side.

A/B Epoxy glue

Remove

the covering.

Top side.

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