Carl Goldberg GBGA1088 User Manual

1

WARNING

A radio-controlled model is not a toy and is not intended for persons under 16 years old. Keep
this kit out of the reach of younger children, as it contains parts that could be dangerous. A radio­controlled model is capable of causing serious bodily injury and property damage. It is the buyer's
responsibility to assemble this aircraft correctly and to properly install the motor, radio, and all other
equipment. Test and fly the finished model only in the presence and with the assistance of another
experienced R/C flyer. The model must always be operated and flown using great care and common
sense, as well as in accordance with the Safety Code of the Academy of Model Aeronautics (5151
Memorial Drive, Muncie, IN 47302, 1-800-435-9262). We suggest you join the AMA and become prop­erly insured prior to flying this model. Also, consult with the AMA or your local hobby dealer to find an
experienced instructor in your area. Per the Federal Communications Commission, you are required
to use only those radio frequencies specified "for Model Aircraft."

LIMITED WARRANTY

Carl Goldberg Products, Ltd. has inspected and certified the components of this aircraft. The company urges the buyer to perform
his own inspection, prior to assembly, and to immediately request a replacement of any parts he believes to be defective for their
intended use. The company warrants replacement of any such components, provided the buyer requests such replacement with­in a period of 90 days from the date of purchase and provided the defective part is returned, if so requested by the company.

No other warranty, expressed or implied, is made by the company with respect to this kit. The buyer acknowledges and under­stands that it is his responsibility to carefully assemble the finished flying model airplane and to fly it safely. The buyer hereby
assumes full responsibility for the risk and all liability for personal or property damage or injury arising out of the buyer's use of the
components of this kit.

CARL GOLDBERG PRODUCTS, LTD.

P.O. Box 88 Oakwood GA 30566 Phone #[phone] Fax # [phone] www.carlgoldbergproducts.com

Aerobatic flying just doesn't get any better than this Pitts ARF. The classic lines of a biplane coupled with the
radial cowl, add excitement to the maneuvers you love, knife edge, split S, lumcevac, torque rolls, snaps, and
ground-hugging inverted flight. What's more, we've engineered this ARF to get you into the air with a minimum
of fuss. So take a few minutes to carefully read the introductory material and then get to work. You'll soon be
out at the field with a classic aerobatic champion!

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©Copyright 2004 Carl Goldberg Products

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1. Fuselage

2. Cowl

3. Fin

4. Rudder

5. I-Strut (2)

6. Landing gear legs (2)

7. Wheel Pants (2)

8. Canopy

9. Belly pan

10. Stab

11. Elevators (left and right)

12. Top wing with ailerons

13. Bottom wing with ailerons.

PARTS LIST

HARDWARE LIST

Cabane Struts (4) pcs.
(12) 4-40x1/2” socket head screws
(4) #4 flat washers

I Struts (2) pcs.
(8) 4-40x1/2” socket head screws
(8) #4 Flat washers
(8) 4-40 aircraft lock nuts

(8) 1/4”x20 eye bolts

Landing gear 2pcs
(6) 6-32x3/4” socket head screws
(6) #6 Flat washers
(2) 4mm axles with lock nuts
(2) 4mm wheel collars with set screws
(2) 2-3/4” wheels
(2) 4-40 T-nuts
(2) 4-40x1/2” socket head screws.

3

Motor Mounts (2) pcs
(4) 8-32 x 1” Socket head bolts
(4) 8-32 x 1-1/4” Socket head bolts
(4) 8-32 T-nuts
(4) aircraft lock nuts
(12) #8 flat washers

Flying wires

(13’) braided cable (for flying wires and rudder pull-

pull.
(8) metal plates
(8) 2-56 rigging couplers (4 flying wires 4 rudder)
(12) cable swages (8 flying wires 4 rudder)
(3) 2-56x1/2” screws
(3) #2 flat washers
(3) 2-56 nuts
(4) 2-56 golden clevis
(4) metal clevis clips
(2) #2 x 1/2” sheet metal screws

Pushrods

(1) 8mm x 17” wooden dowel
(2) pcs shrink tube
(1) 5/32 x 19” plastic tube
(4) 2-56x 1-3/4” pushrods threaded both end(ailerons)
(2) 2-56 x 7-1/2” Pushrods threaded one end(elevator)
(1) 2-56 x 20” threaded one end ( throttle)­(1) 2-56 x 6” rod threaded one end (elevator, servo

end)
(16) golden clevis
(16) metal clevis clips
(1) pushrod connector(throttle)
(16) 2-56 nuts

Wing attachment
(2) 8mm x 1-1/2” wooden dowels
(1) ply plate( mounting bolt reinforcement)

(2) 1/4” x 2” wing mount bolts
(2) 1/4” flat washers

Tail Wheel
(1) tail wheel bracket

(1) 1-1/4” tail wheel
(2) #6x 3/4” sheet metal screws
(2) #6 flat washers
(2) springs
(1) 6-32 x 3” threaded rod
(2) nylon adjustable horn bracket
(2) 1/8” wheel collars with set screws

Control Horns
(6) 6-32 x 2” machine screws(ailerons and elevator)

(1) 6-32 x 3” threaded rod(rudder)
(8) #6 flat washers

(8) #6 nuts
(10) adjustable horn brackets

Fuel Tank (500cc 16.91oz.)
(3) feet fuel line

(1)tank stopper
(3) brass tube
(1) tank clunk

Cowl Mount
(4) 4-40 x 3/4” socket head screws
(4) 1/4” long silicone fuel tubing.
(4) #4 flat washers

Miscellaneous
(21) CA hinges
(1) 1/8” x 24” nylon tubing
(1) 4” x 12” clear plastic

4

Before you begin assembling your Pitts ARF, take some
time to read through this entire instruction book. It is
designed to take you step-by-step through the process and
to give you added information on engine and radio selection
and set-up, balancing your aircraft, and flying your model.
The time you spend will speed the assembly process and
help you avoid problems.

PREPARING FOR ASSEMBLY

You will need a work area of approximately 24 x 70" which has been
covered to protect it from adhesive, as well as cuts and other
damage. Many people cover their work area with a sheet of
dry wall (sheet rock) and/or waxed paper t o prevent CA
Glue and Epoxy from ruining the work surface.

CONSTRUCTION TIPS

IMPORTANT: ALWAYS READ A FEW STEPS AHEAD.
This will alert you to coming instructions and will help you
plan accordingly.

Using the Parts Identification section, familiarize yourself
with the various items included in your kit box.

As you work, CHECK OFF EACH STEP in the box provid­ed, so that you are sure you do not forget anything.

Do not hesitate to ask questions. Your local hobby dealer
and area flyers will most likely be happy to help, as they
want you to have a successful flying experience. You may
also receive technical assistance from Carl Goldberg
Products, Ltd. by telephone [phone].

ADHESIVES & GLUING TECHNIQUES

CA adhesives are specially formulated to firmly glue the ply­wood, hardwood, and balsa used in your model and to with­stand the vibration and stresses of high performance flight.
However, there are times, such as when you are installing
the stabilizer and fin on the fuselage and want more set­up time for careful alignment and positioning, then you
should use epoxy.. Occasionally, you also will want to use
thin CA, which "wicks" into the surrounding areas. Aliphatic
resin glue or similar water-based glues can also be used,
but they will add to the assembly time because they dry so
much more slowly than CA glue. Remember, when ever
using any CA, you must be careful to read instructions thor­oughly, as you will have only seconds for positioning of
parts. Be sure to trial fit parts together before gluing. Also,
never use watery THIN type CA glue for gluing plywood and
hardwood parts. Thin CA's do not adequately bond these
areas.

CAUTION

Some people may experience an allergic reaction when
exposed to fumes from CA glue or epoxy. As with paints,
thinners, and solvents, it is always important to use glues
only where there is adequate ventilation to carry fumes
away. A fan is recommended. Also, special care must be
taken when using CA, as it will bond skin as well as other
surfaces. Before using any CA, carefully read all label pre­cautions. When using CA, protective eye-wear and care in
keeping the glue away from the face is highly recommend­ed. If CA does happen to get into the eye, hold lid open and
flush with water only. Seek immediate medical attention.

COVERING

The Pitts ARF is covered in a premium polyester film cho­sen by many of the world's top flyers for its beauty, tough­ness, and ease of application and repair. It is not uncom­mon for ARF's to develop a few wrinkles in transit. If this is
true of your model, the situation is easily corrected. Before
you begin putting the pieces together, run over the surface
of each section with an iron (either specially designed for
airplane use or the more cumbersome household iron) or
use a modeling heat gun. Apply the heat (set at about 350°
F), following along with a soft cloth and pressing down on
the covering as you go around. This will more firmly set the
covering adhesive into the wood and keep your aircraft cov­ering tight and smooth in the future.

One of the great advantages of polyester film is that it can
be applied over itself without causing gas bubbles. This
allows you to repair your aircraft, as well as to customize it
in a number of ways. If, due to a flight mishap, you get a
hole or similar covering damage, simply trim away the
ragged edges and then apply a patch, following the direc­tions that come with your covering , which is available at
your hobby dealer.

Important

Information

Covering coming loose is not
COVERED UNDER WARRANTY.
Due to temperature changes the
plane may develop some wrinkles in
the covering that you will need to
remove with an iron. Be sure to seal
the edges down first so that you do
not cause the covering to shrink and
leave exposed areas of wood. Please
inspect the plane before beginning to
assemble to make sure you are
happy with it. After assembly has
begun you cannot return the kit. If
you find a problem before beginning
to assemble the plane you must con­tact us, please do not return it to the
dealer.

Notice:

Before starting be sure all parts have not been damaged during shipping. Once

assembly has been started, all warrenty on parts are void.

5

ITEMS NEEDED TO COMPLETE THIS AIRCRAFT

 1 RADIO GUIDANCE SYSTEM (4 CHANNEL

MINIMUM REQUIRED WITH 7 SERVOS)

 You will need 7 servos for the plane. we rec-

ommend a standard servo on the throttle and
4 standard servos are ok for the ailerons. The
elevator and rudder needs a 100oz of more
servo. We used the Futuba S9151 which is
132 oz.

 4 6” AILERON SERVO EXTENSION WIRES
 3 Y-HARNESS

 1 ENGINE .61-.108 2-STROKE, .91- 1.20 4-

STROKE AND MUFFLER

 1 CA ACCELERATOR
 1 2 OZ. BOTTLE CA MEDIUM GLUE
 1 1/2 OZ. BOTTLE CA THIN GLUE

 1 20 MINUET EPOXY
 1 1/4” FOAM RUBBER

OPTIONAL:

 1 1/5 PILOT FIGURE
 1 Prop to fit your engine

 1 Spinner 3 inch

NOTE: The Pitts ARF covering matches

Yellow(#885), Blue(#872) Oracover.

TOOLS AND SUPPLIES FOR ASSEMBLY.

 MODELING OR UTILITY KNIFE
 WORK SURFACE (24" X70")
 ELECTRIC DRILL
 1/16”, 3/32”,1/8", 3/16”, 5/32”, 1/4”, 5/64”

7/32” DRILL BITS

 SMALL STANDARD & PHILLIPS SCREW-

DRIVERS

 MASKING TAPE
 NEEDLE NOSE PLIERS
 MOTO TOOL
 24” RULER
 FLEXIBLE STRAIGHT-EDGE
 30-60-90° x 6" TRIANGLE
 SOFT PENCIL
 A FEW STRAIGHT OR "T" PINS
 ADJUSTABLE WRENCH
 WIRE CUTTER (DYKES)
 OPTIONAL HEAT GUN/COVERING IRON
 ACID BRUSH
 ELECTRICAL TAPE
 PIECE OF MEDIUM SANDPAPER
 5 FT. LENGTH OF STRING

Caution:

Before starting, carefully go over all high

stress areas with an epoxy or wood glue to

confirm all areas are well glued.

6

WING ASSEMBLY

1.  Collect the following parts:

(1) Left wing
(1) Right wing
(1) Left aileron
(1) Right aileron
(12) CA hinges

AILERON INSTALLATION

2.  Locate the pre-cut aileron hinge slots in both

wing halves. Using a hobby knife (#11 blade),
slide the blade into each slot to make sure it
is cleanly cut.

 Repeat this process with the ailerons, mak-

ing sure all hinge slots are clean.

3.  Place a straight pin into the center of each of

the four CA hinges.

 Slide each hinge into the hinge slots on one of

the wing halves. The pin will prevent the
hinges from going further than halfway into the
wing.

4.

 Select the aileron for the wing on which you

are working and insert the exposed half of
each hinge into the aileron slots.

4.  Select the aileron for the wing on which you

are working and insert the exposed half of
each hinge into the aileron slots.

 Slide the aileron toward the wing until no

gap remains between the aileron and the
wing.

5.

 Carefully check the alignment of the aileron.

It should be centered, with about 1/32" on
either end.

 When satisfied with the alignment, remove

the straight pins, being sure to keep the
aileron tight to the wing. You may wish to
apply a few pieces of masking tape to keep
the pieces in place.

6.  Keeping the aileron and wing in position,

deflect the surface to it’s full deflection and
apply 3 or 4 drops of CA glue to the small
exposed area of each hinge.

 Turn the assembly over and again apply 3 or 4

drops of CA glue to the exposed hinge sur­faces.

 Allow to dry for 10 minutes before flexing the

aileron.

7.

 Repeat the above steps for the other three

wing ailerons.

7

AILERON SERVO INSTALLATION

Note: The following pictures may not exactly match

the hardware you are using. Always check the
radio manufacturer's instructions when installing
radio equipment.

1.  Collect the following items:

(4)Servo mounting screw (supplied with radio)

(1)Servo with rubber grommet (supplied with

radio)

(4) Servo extensions “6”

IMPORTANT! To ensure that any connections locat-

ed inside the wing will not come loose, either when
the wires are pulled, or during flying, always tape

them securely together with electrical tape.

4.  Making sure to use the correct servo for the

opening, attach the servo wire to the 6" exten­sion and securely tape the connection.

 Locate the string inside the aileron servo

mount, and the other end in the exit hole.The
hole in the top wing is just behind the front
cabane mount, The bottom wing has the hole
in the middle of the center section.

 Tie the string to the aileron extension by loop-

ing it through the opening between the wires
on the plug and taping with masking tape.

5.

 Grasping the string, SLOWLY pull until the

end of the 6" extension comes out of the hole.

 Tape the extension securely to the wing, so

that it will not slide back in while you are work­ing.

 Secure servo with the screws supplied with

the radio.

 Repeat for the other three wing servos.

AILERON CONTROL HORN INSTALLATION

1.  Collect the following items

(8) 2-56 Golden Clevis
(8) Clevis Clips
(8) 2-56 Hex Nut

(4) 2-56 x 1-3/4” threaded both ends wire
(4) 6-32 x 2” Bolt
(4) 6-32 Hex nut
(4) #6 Washer
(4) 6-32 Horn Bracket

2.  With the aileron servo in place, make a mark

at a 90º degree angle to the trailing edge and
in line with the servo arm.

3.

 Use the mark to locate the hard point installed

in the aileron( dowel with hole in middle).

4.  Using a 9/64" drill bit, open the hole in the

aileron through to the top side.

HINT: Drill the hole from the bottom half way.

Then drill down to the hole from the top of
the aileron.

5.  Insert the 6-32 x 2” screw from the top through

the aileron.

 Place the #6 washer and the 6-32 hex nut on

the bolt and tighten. Make sure that you use
thread lock on the bolt and nut.

 Screw the adjustable horn bracket on the

bolt.

8

6.  Thread on to one end of a 2-56 x 1-

3/4” pushrod a nut and Golden Clevis.

 Mount the pushrod onto the the horn brack-

et.

 Thread the other 2-56 clevis and nut on the

other end.

 Install the rod in the control arm.
 Slide the clevis clip on to each of the Golden

Clevis pins.

 Repeat the above steps for the other three

ailerons.

7.  You will need a Y-connector for the top aileron

servos. It will exit the fuselage through a hole
just to the inside of the front cabane strut. Use
cable ties to hold it to the cabane strut so the
plug is at the top on each side. You can then
plug the ailerons in and attach the top wing.

aileron plug

cable ties

9

Before mounting the tail the bottom

wing should be installed.

 Collect the following items

(1) Fuselage

(1) Bottom wing

(2) Wing dowels (8mm x 40mm)

(2) 1/4” x 2” wing bolts

(1) Trailing edge reinforcement plate. 1/8” ply.

1.  Epoxy the dowels in the pre-drilled holes in the

leading edge

2.  Lay the 1/8” plywood plate over the holes in the

trailing edge of the wing and insert the wing bolts
for alignment. Use a pen and mark the outline of

the plate on the covering.

3.  Remove the covering by cutting about 1/8”

inside the line you just drew. Be careful and
do not cut into the wood.

4.  Use epoxy and glue the plate in place. Insert

the wing bolts to make sure the holes are
aligned and clamp into place till dry.

5.  Set the wing in place with the dowels inserted

into the bulkhead and install the wing bolts.

Bottom Wing Mounting

Caution:

Do not glue the bolts!