Black Horse Model PITTS Owner's manual

SPECIFICATION


Wingspan : 1.500 mm 59.06 in.


Length : 1.330 mm 52.36 in.


Weight : 4.7 kg 10.34 Lbs.


Radio : 6 channels.


Servo : 7 servos.


Engine : 120 2stroke.
Instruction Manual book
MadeinVietnam.

2
PITTS - ITEM CODE: BH85.Instruction Manual
This instruction manual is designed to help you build a great flying aeroplane. Please read this
manual thoroughly before starting assembly of your PITTS. Use the parts listing below to identify
all parts.
WARNING
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.
IfyouareinexperiencedwithbasicR/CflightwestronglyrecommendyoucontactyourR/Csupplier
and join your local R/C Model Flying Club. R/C Model Flying Clubs offer a variety of training
proceduresdesignedtohelpthenew pilotonhiswaytosuccessfulR/C flight.Theywillalso beable
to 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.
Modellingknife.
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.
HARDWAREPACK
COWLING.
Landinggear.....
Toavoid scratching yournew airplane,donot
unwrap the pieces until they are needed for
assembly. Cover your workbench with an old
towel or brown paper, both to protect the air-
craftand toprotect thetable.Keepacoupleof
jars or bowls handy to hold the small parts af-
ter you open the bag.
Pleasetrialfitalltheparts. Makesureyouhave
the correct parts and that they fit and are
alignedproperly beforegluing!Thiswillassure
proper assembly. PITTS ARF is hand made
from natural materials, every plane is unique
andminor adjustmentsmayhave tobe made.
However, you should find the fit 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 follow-
ing:paintthinner,C/Aglueaccelerator,C/Aglue
debonderandacetone. Donotletthesechemi-
cals come in contact with the colors on the
covering and the plastic parts.
PARTS LISTING
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-
installedrudder.
(1) Horizontal stabilizer with pre-
installedelevator halves.
SUGGESTION
NOTE.

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PITTS - ITEM CODE: BH85.Instruction Manual
Caution: this model is not a toy!
If you are a beginner to this type of powered
model,please askan experiencedmodelflyer
forhelp andsupport.Ifyouattempttooperate
themodel withoutknowingwhat youaredoing
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
Evenifyou havealready built alarge number
ofRC modelspleaseread rightthrough 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 film covering
Minor creases or bubbles may develop in the
film covering due to major fluctuations in
weather conditions (temperature, humidity
etc.); in rare cases you may even find a slight
warp in a component. These minor faults are
in the nature of film-covered built-up wooden
structures, and can easily be corrected using
a heat gun, as commonly used for modelling.
Creases: Blowwarm airoverthearea
and rub down with a soft
cloth.
Wing warp: Hold the panel twisted
gently in the opposite
direction to the warp, and
apply warm air to remove
the creases from the
covering.
Caution! do not heat the film more than is
absolutely necessary. If the air or the iron is
too hot, the film may melt and holes may be
formed.
This model is highly pre-fabricated and can
bebuilt inavery shorttime.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
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 fit the
screw.
+ This is not a toy
+ Be sure that no other flyers 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.
+Theglowplug clipmustbesecurely attached
to the glow plug.
+ Do not flip the propeller with your fingers.
+ Keep loose clothing and wires away from
thepropeller.
+ Do not start the engine if people are near.
Donot standinlinewiththesideof thepropel-
ler.
+ Make engine adjustments from behind the
propeller only. Do not reach around the spin-
ningpropeller.
SAFETY PRECAUTION.
REPLACEMENT SMALL PARTS
B1. Wing panel (upper wing).
C. Fuselage.
A.Cowling.
D . Horizontal stabilizer.
F. Aluminium wing dihedral brace.
E. Vertical stabilizer
B2. Wing panel(lower wing).
C
D E
B2
F
A
B2
B1
B1

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PITTS - ITEM CODE: BH85.Instruction Manual
1. Wheels pants.
9. Fuel tank.
2. Main gear .
3. Wheels.
6. Tail gear.
8.Spinner.
C/Aglue
C/Aglue
Bottom side
Aileron
4. Plastic-enginemount.
C/Aglue
5. Covering of main gear.
7.Plastic forrudder.
10. Wing struts sets.
INSTALLING THEAILERON SERVO,CONTROL
HORN.
Top side Aileron
1. 1.
2.
3.
4.
6.
7.
5.
8.
9.
10.
Bottom side Aileron
Aileron Bottom side
C/Aglue
11.
11. Wing joining.
INSTALLING THEAILERONSERVO
(LOWERWING)

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PITTS - ITEM CODE: BH85.Instruction Manual
2.Using amodeling knife,remove thecov-
ering servo tray.
Secure
Aileron
1. Install the rubber grommets and brass
eyelets onto the aileron servo.
INSTALLING THEAILERON SERVO . 4) Drill1,6mm pilotholes throughthe block
of wood for each of the four mounting screws
provided with the servo.
3) Using the thread as a guide and using
masking tape, tape the servo lead to the end
of the thread: carefully pull the thread out.
When you have pulled the servo lead out, re-
move the masking tape and the servo lead
from the thread.
5. Instal servo tray with aileron servo into
the wing as same as picture below.
2x10mm.
Thread
Electric wire.
Remove covering.
Secure
2.INSTALLING THE AILERON CONTROL HORN.
(LOWER WING)
3mm x 40mm.
Nilon control clasp.
M3 lock nut.

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PITTS - ITEM CODE: BH85.Instruction Manual
Installing the aileron linkages as pictures
below.
Aileroncontrolhorn
INSTALLING THE AILERON
LINKAGES.
Control horn
of the aileron
M2 M2 lock nut
75mm

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PITTS - ITEM CODE: BH85.Instruction Manual
Repeat the procedure for the right lower
wing half.
C/Aglue
Bottom side
Parts requirement. See pictures below:
WING STRUT INSTALLATION
(UPPER WING).
C/Aglue
C/Aglue
C/Aglue
Bottom side

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PITTS - ITEM CODE: BH85.Instruction Manual
Secure
2 x 10mm
Repeat the procedure for the right lower
wing half (Top of right ).

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PITTS - ITEM CODE: BH85.Instruction Manual
1 1. Locate the aluminium wing dihedral
brace.
Top right side
JOINING THE WING HALVES
(UPPER MAIN WING).
Secure
Drill a hole 3mm
diameter
2.Testfitthealuminiumdihedralbraceinto
each wing half. The brace should slide in
easily.
Bottom side of left
upper a wing.
Aluminium brace.
Left
Right
Top side of left
upper a wing.
Top side of right
upper a wing.
4 x 30mm
Drill a hole 3mm
diameter
Top left side
Secure

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PITTS - ITEM CODE: BH85.Instruction Manual
Top side
Bottom side
4x30mm
4x30mm
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
muffler.
4) Carefullybendthe thirdnylontubedown
ata 45degreeangle (usingacigarettelighter).
This tubewill bevent tubeto thefuelingvalve.
INSTALLING THE STOPPER ASSEMBLY
1) The stopper has been pre-assembled
at the factory.
2) Using a modeling knife, cut one length
ofsilicon fuelline(thelengthofsiliconfuel line
iscalculatedbyhowtheweightedclunkshould
restabout 8mmaway fromtherearofthetank
andmove freelyinside thetank). Connectone
FUEL TANK.
end of the line to the weighted clunk and the
otherend tothenylonpickuptubein thestop-
per.
Drill a hole
4mmdiameter
See pictures below:
INSTALLING THE ENGINE MOUNT.

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PITTS - ITEM CODE: BH85.Instruction Manual
When the stopper assembly is installed in the
tank, the top of the vent tube should rest just
belowthe topsurfaceof thetank. Itshould not
touch the top of the tank.
5) Test fit the stopper assembly into the
tank. It may be necessary to remove some of
the flashing around the tank opening using
amodeling knife. Ifflashing is present, make
sure none of it falls into the tank.
6) When satisfied with the alignment of
thestopperassemblytightenthe3mmx20mm
machine screw until the rubber stopper ex-
pandsand sealsthetank opening.Do notover
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 firewall. 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 frontofthetankshould justabout
touch the back of the firewall.
Vent tube Fuel pick- up tube
Fuelfilltube
Blow through one of the lines to ensure
the fuel lines have not become kinked inside
the fuel tank compartment. Air should flow
througheasily.
9) To secure the fuel tank in place, apply a
bead of silicon sealer to the forward area of
thetank, whereit exitsthefuselage behindthe
enginemountingbox andtotherearofthetank
at the forward bulkhead.
Do not secure the tank into place perma-
nently until after balancing the airplane. You
may need to remove the tank to mount the
battery in the fuel tank compartment
silicon tube not included.

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PITTS - ITEM CODE: BH85.Instruction Manual
Fueltank
Locate the long piece of wire used for the
throttlepushrod. Oneendofthewire hasbeen
pre-bend in to a “Z” bend at the factory. This
“Z” bend should be inserted into the throttle
armofthe enginewhentheengine isfittedonto
theengine mount.Fittheengineto theengine
mount using the screws provided.
Right side
140mm.
INSTALLING THE ENGINE.
Mark
point
Drill a hole
4mmdiameter
4x 30mm
Pushrod wire.
Secure

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PITTS - ITEM CODE: BH85.Instruction Manual
Right side
Pushrod
wire.
 1) Slide the fiberglass cowl over the en-
gineand lineup thebackedgeofthe cowlwith
the marks you made on the fuselage.
Left side
COWLING. 4) Installthemufflerand mufflerextension onto the engine and make the cutout in the
cowl for muffler clearance. Connect the fuel
and pressure lines to the carburetor, muffler
andfuel fillervalve.
3) Slide the cowl back over the engine
andsecure itin placeusing fourwood screws.
See picture below.
2) While keeping the back edge of the
cowl flush with the marks, align the front of
thecowlwiththecrankshaftoftheengine. The
front of the cowl should be positioned so the
crankshaft is in nearly the middle of the cowl
opening. Hold the cowl firmly in place using
pieces of masking tape.
Top side

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PITTS - ITEM CODE: BH85.Instruction Manual
Top side
Machinescrew
Frontview.
INSTALLING THE SPINNER.
Installthe spinnerbackplate,propellerand
spinner cone. The spinner cone is held in
place using two 3mm x 12mm wood screws.
3 x 15mm
Secure
Left side
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 accommodate the
servo connector. Remove the excess mate-
rial from the arm.
INSTALLING THE THROTTLE PUSHROD.
After installing the adjustable metal con-
nector apply a small drop of thin C/A to
the bottom nut. This will prevent the con-
nector from loosening during flight.
Servo arm.
Connector.
Throttle servo
Throttlepushrod
Trim and cut
Botton side

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PITTS - ITEM CODE: BH85.Instruction Manual
Cut
SERVO INSTALLATION.
ELEVATOR INSTALLATION.
2. Mount the servo to the tray using the
mountingscrews providedwithyourradiosys-
tem.
1. Install the rubber grommets and brass
colletsintothe elevatorservo.Testfit theservo
into the servo tray.
Secure
Throttle
servo
C/Aglue
C/Aglue
C/Aglue
See pictures below:
HORIZONTALSTABILIZER.

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PITTS - ITEM CODE: BH85.Instruction Manual
2 Using a modeling knife, cut away the
covering from the fuselage for the stabilizer
and remove it.
3. Mark theshape ofthe verticalon theleft
and right sides onto the horizontal stabilizer
using a left-tip pen.
Remove covering
Markpoint
Bottom side
C/Aglue
C/Aglue
C/Aglue
1. Draw a center line onto the horizontal
stabilizer. Then slide the horizontal into the
fuselage.
center line

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PITTS - ITEM CODE: BH85.Instruction Manual
4. Remove the stabilizer. Using the lines
youjustdrew asa guide,carefully removethe
coveringfrom betweenthem usingamodeling
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 fail-
ure during flight.
Remove
covering
Check to mark sure the wing and stabi-
lizer are paralell. If they are not, lightly sand
theopening inthefuselageforthe stabilizer
until the stabilizer is paralell to the wing. 6. Afterthe epoxy has fully cured, remov
the masking tape or T-pins used to hold the
stabilizer in place and carefully inspect the
glue joints. Use more epoxy to fill in any
gaps that were not filled previously and
clean up the excess using a paper towel and
rubbingalcohol.
epoxy cures. Remove any excess epoxy us-
inga papertoweland rubbingalcoholand hold
the stabilizer in place with T-pins or masking
tape.
 5. When you are sure that everything is
aligned correctly, mix up a generous amount
of 30 minute epoxy. Apply a thin layer to the
topand bottomofthestabilizermountingarea
and to the stabilizer mounting platform sides
inthefuselage.Slidethestabilizerinplaceand
re-align. Double check all of your measure-
ments one more time before the
Epoxyglue
Epoxyglue
C/A glue

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PITTS - ITEM CODE: BH85.Instruction Manual
Elevator control horn install as same as the
way of aileron control horn. Please see pic-
tures below.
Control horn of elevator.
ELEVATOR CONTROL HORN
INSTALLATION.
ELEVATOR PUSHROD INSTALLATION.
3mm x 40mm.
Nilon control clasp.
M3 lock nut.
M2 M2 lock nut.
 Elevatorand rudderpushrod installassame
as the way of aileron pushrod.
Elevator
control horn.
ELEVATOR PUSHROD INSTALLATION.
C/Aglue
C/Aglue

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PITTS - ITEM CODE: BH85.Instruction Manual
Elevator
pushrod Elevator
pushrod
Secure
Elevatorservo
Secure
Throttle servo
Elevator servo
Rudder servo
Throttle pushrod

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PITTS - ITEM CODE: BH85.Instruction Manual
C/Aglue
C/Aglue
Removecovering
1) Using a modeling knife, remove the
covering from the top of the fuselage and the
covering from over the precut hinge slot cut
intothelower rearportion ofthe fuselageThis
slot accepts the lower vertical.
 2. Put the rudder into the fuselage as
same as picture below.
3. Mark theshape ofthe verticalonthe left
and right side on the rudder using a felt-tip
pen.
Also carefully remove the covering from
the horizontal fin as below the lines which
you drew as same picture below.
4. Now, remove the rudder and using a
modeling knife, carefully cut just inside the
marked lines and remove the film of the rud-
der. Just as you did with the horizontal stabi-
lizer, make sure you only press hard enough
to cut the film, not the balsa rudder.
Removecovering.
Markline
Rudder servo install as same as method of
elevator servo. See picture below:
VERTICAL INSTALLATION.