Carl Goldberg GBGA1090 User Manual

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Congratulations on your purchase of the Obsession 3D ARF. This is a very unique dual-purpose
aircraft, capable of flying any FAI pattern sequence with ease, while exhibiting remarkable 3-D capa­bilities. Every effort has been made to produce a lightweight, straight, easy to assemble aircraft.
Because of its oversize control surfaces which are double beveled to allow for extreme throws, great
care must be taken in the set-up and flying of this airplane. Quality hardware components have
been provided to allow for 3D set-up while maintaining adequate mechanical advantage to eliminate
flutter. It is you responsibility as an advanced pilot to fly the aircraft in an intelligent manner. THROT-
TLE MANAGEMENT IS A MUST!!!!!!! Carl Goldberg Products has flown the Obsession 3D ARF
through a very rigorous flight-testing schedule and have stressed the airframe beyond all practical
parameters without a single failure. Carl Goldberg Products will NOT

warrant the Obsession 3D
ARF against flutter due to improper set-up or excessive speed maneuvers. having said that, we
believe you will find the Obsession 3D ARF to be one of the most responsive, in-the-grove aircraft
on the market. The Obsession 3D ARF excels at high-alpha maneuvers including Harriers (both
upright and inverted), high-alpha rolls, and high-alpha knife edge. Torque rolls, waterfalls, knife edge
loops and elevators are all within the performance parameters of this unique aircraft. Just remember
to use common sense when flying this high performance machine.

©Copyright 2004

OBSESSION

OBSESSION

3D ARF

3D ARF

P.O. Box 818 Oakwood GA 30566 Phone #[phone] Fax # [phone] www.carlgoldbergproducts.com

CARL GOLDBERG PRODUCTS, LTD.

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We are very proud of the construction of the Obsession 3D ARF and all of our other
ARF aircraft. Each aircraft is jig built to insure a straight true airframe. Every effort is
made to build as light an aircraft as possible. As with any professional builder, glue is
used sparingly. Please take a moment during assembly and run a bead of CA or

aliphatic resin into the high stress joints, such as the landing gear plate, servo
mounting trays, wing hold down blocks, etc. Also, during the course of shipping

from the manufacturer to our facility in the United States, it is not uncommon for the air­craft to experience several changes in climate. This may cause the iron-on covering to
develop wrinkles. This is not a fault of the manufacturer. Please take a few minutes with
your heating iron and heat gun to iron down the seams and re-shrink the covering
where needed. The results will be a beautiful aircraft with a breathtaking finish that you
will be proud to display at your flying club.

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.

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Parts List

1. Fuselage

2. Fiberglass Cowl

3. Wing (Right & Left) with ailerons

4. Stab (Right & Left) & elevator assembly

5. Rudder

6. Fiberglass wheel pants

7. Canopy

8. Canopy Hatch

1. (2) Motor Mounts

2. (4) 8-32 x 1” Socket Head Bolts

3. (4) #6 x 3/4 Socket Head Screws

4. (4) #8 lock washers

5. (4) #8 flat washers

Motor Hardware

Landing Gear

1. Main Gear 1 left 1 right

2. (4) 4-40 x 1/2”” Button Head Bolts

3. (4) 4-40 Blind Nuts

4. (6) 8-32 x 1/2” Socket Head Bolts

5. (2) 3-1/4” main wheels

6. (2) 5/32 x 1-1/4” Axles

7. (2) Axle Locking Nuts

8. (2) 4mm flat washers

9. (2) 5/32 Wheel Collars

10. (2) 4-40 x 1/8 Set Screws

Tail wheel

1. (1) Tail wheel bracket

2. (1) 1-1/2” tail wheel

3. (2) 6-32 x 3” threaded rod

4. (2) 6-32 Hex Nut

5. (2) #6 Washer

6. (6) 1/8” Adjustable Horn bracket

Wing

1. (1) 1-1/2” x 25-3/16” Wing Tube

2. (2) 4-40 x 1/2” Bolt

COWL HARDWARE

1. (4) 4-40x 1/2”Button Head Screws

Control System

1. (5) Nylon Adjustable Control horns

2. (5) 6-32 x 2-1/4” Allen head Bolt

3. (5) Nylon Nut

5. (5) Nylon Cup Washer

6. (2) 4-40 x 2-3/16” double Threaded Rod
(Aileron)

7. (2) 4-40 x 4-7/8” Double Threaded Rod
(elevators)

8. (1) 4-40 x 6-1/4” Double Threaded Rod
(Rudder)

9. (5) 4-40 Hex Nut

10. (5) 4-40 Metal Clevis

11. (5) Metal Clevis Clips

12. (1) 2-56 x 15” Threaded Rod
(Throttle Pushrod)

13. (1) 1/8 I.D. x 14” Nylon Tubing
(Throttle Pushrod)

14. (1) EZ connector (Throttle)

Fuel Tank

1. (1) Fuel Tank

2. (1) Rubber stopper

3. (2) Metal caps for stopper

4. (1) Screw

5. (1) Clunk

6. (3) Aluminum fuel tubes

7. (1) Silicone fuel line

1. (1) 1/2” x 15-9/16” Rear Stabilizer Tube

2. (1) 1/2” x 8-11/16” Front Stabilizer Tube

2. (2) 4-40 x 1/2” Bolt

Stabilizer

Additional Items Needed

1. (5) Servo arm extensions

2. (1) Fuel Tubing 36”

3. Electrical Straps (various sizes)

4. 1/2” Foam Rubber

5. (3) 24” Servo Extensions

6. (2) 12” Servo Extensions

7. (1) Y-Harness

8. (1) 24” Thread

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Before beginning assembly of your Obsession
3D ARF, we highly recommend that you study
this manual in its entirety. You should begin
planning your radio installation based on your
choice of engine and equipment from the begin­ning.

Because the Obsession 3D ARF is intended
for those with some degree of modeling experi­ence, every little detail will not be covered. This
is not a basic trainer. Assembly of this aircraft
will be easy for the experienced modeler, and
by following the instructions within this manual
and using the skills you’ve gained during your
modeling career you will be able to produce a
first class aircraft.

Building supplies needed

Hobby knife w/#11 blades
Thin CA
Medium CA
Canopy glue
30 minute epoxy
Thread lock
Diagonal wire cutters
Pliers
Assorted drill bits
Various sized screwdrivers( both Phillips and
standard head)
Tape measure
Dry-erase marker
Paper towels
Rubbing alcohol
Electrical tape
4-40 Tap & Die Set
3/32, 7/64, 9/64 & 3mm Allen wrench

1. Begin construction by Inserting the front and
rear stabilizer tubes through the fuselage. (The
short tube goes in front).

2. Trial fit each side of the stabilizers onto the
tubes. Lightly sand the tube openings if neces­sary.

Note:

Now is the time to decide if you want

to glue the stabilizer to the tubes and

the fuselage, or if you wish to have

removable stabilizers.

1. Using a pencil, make an outline where the

stabilizer rest against the fuselage.

2. Remove both stabilizers from the tubes.

3. Remove the tubing from the fuselage.

4. Lightly sand the tubing using 220 sand paper.

5. Remove the covering from the fuselage

inside the outline that you made.

6. Mix up epoxy and slide the stabilizer assem­bly together again, allow to dry.

Mounting Stab

Collect the following parts:

(1) Left Stabilizer
(1) Right Stabilizer
(1) 1/2” x 8-11/16” Front Stabilizer Tube
(1)1/2” x 15-9/16” Rear Stabilizer Tube
(2) 4-40 x 1/2 bolts

Gluing Stabilizer

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Removable Stabilizer

1. Using a drill for a 4-40 tap, drill through the

hole located on top of the stabilizer.

2. Tap the hole with a 4-40 tap.

3. Making sure that the stabilizers stay tight to

the fuselage, repeat for the other side.

4. Before flying place clear plastic tape over
the screw holes to keep the screws from
vibrating out.

Installing Elevators

Collect the following parts:

(1) Left Elevator

(1) Right Elevator

(8) C/A Hinge

(2) Nylon Adjustable Control horns

(2) 6-32 x 2-1/4” Allen head Bolt

(2) Nylon Nut

(2) Nylon Cup Washer

Control Horn Part Names

Nylon Adjustable Control Horn

6-32 x 2-1/4” Allen head Bolt

Nylon Nut

Nylon Cup Washer

1. At the corner of the elevator, on the top and
bottom, feel for the pre-drilled hole in the ply­wood stiffener.

2. Using a 1/8” drill, drill half way through the
elevator hole from both top and bottom till the
drill pass through the elevator.

3. Insert the 6-32 x 2-1/4 allen head bolt into the
top of the elevator.

4. Thread the bolt all the way till the head is
flush with the top of the elevator.

5. On the bottom of the elevator, place first the
cup washer then the nylon nut onto the 6-32
bolt.

6. Using a metric allen wrench tighten the nylon
nut all the way down till it rest in the cup washer
and is tight to the elevator.

7.Thread the nylon adjustable control horn onto
the bolt.(Note: Thread the side that you can

see the cut threads in the nylon onto the
bolt)