Hangar 9 Alpha Trainer Assembly Manual

Specifications

Wingspan: . . . . . . 63 in (1600 mm)

Length: . . . . . . . 52.5 in (1334 mm)

Wing Area: . 710 sq in (45.8 sq dm)

Weight: . . . . . 5–6 lb (2.27–2.72 kg)

ASSEMBLY MANUAL

Almost Ready-To-Fly

2

Table of Contents

Introduction ............................................................................ 2

Warning ............................................................................ 2

Contents of Kit.......................................................................... 3

Additional Required Equipment ................................................ 3

Additional Required Adhesives and Tools ................................ 4

Required Field Equipment ........................................................ 4

Other Items Needed .................................................................. 4

Section 1: Hinging the Ailerons ............................................ 5

Section 2: Joining the Wing Halves ...................................... 7

Section 3: Installing the Aileron Servo Tray .......................... 9

Section 4: Installing the Aileron Servo and Linkages .......... 11

Section 5: Installing the Landing Gear & Wheels ................ 13

Section 6: Installing the Horizontal and

Vertical Stabilizer................................................ 15

Section 7: Hinging the Elevator and Rudder ........................ 18

Section 8: Installing the Elevator and

Rudder Control Horns ........................................ 20

Section 9: Assembling the Fuel Tank .................................. 22

Section 10: Mounting the Engine .......................................... 24

Section 11: Installing the Radio System ................................25

Section 12: Installing the Rudder, Elevator and

Throttle Linkage.................................................. 27

Section 13: Installing the Spinner and Propeller .................. 30

Section 14: Balancing and Control Throw

Recommendations.............................................. 32

Preflight Checks at the Field .................................................. 33

Flying Your Alpha Trainer........................................................ 33

AMA Safety Code.................................................................... 34

Introduction

Congratulations on your purchase of the Hangar 9®Alpha Trainer
ARF (Almost Ready-To-Fly) kit. This aircraft was designed with
the beginning modeler in mind. It is an ideal trainer for the
novice pilot with gentle and forgiving flight characteristics. Once
you have some flight time under your belt, you can put your
Alpha through some basic aerobatics; rolls and loops are smooth
and graceful. The Alpha Trainer ARF kit also includes large
wheels to make ground handling easy, whether your flying field
has a paved runway or grass. And the Alpha Trainer ARF comes
out of the box 90% prebuilt and will have you out at the flying
field in only a few, short evenings.

Care has been taken to write a manual that will guide you
through the assembly of your aircraft. It is important to carefully
read through the instructions before beginning the assembly of
your aircraft. If you encounter difficulty in any construction
sequence, please feel free to contact one of our technicians—
we stand ready to provide any assistance we can concerning the
construction of your Hangar 9 Alpha Trainer ARF. Contact us at:

Horizon Hobby

4105 Fieldstone Road

Champaign, Illinois 61822

[phone]

www.horizonhobby.com

Warning

An R/C aircraft is not a toy; it can cause serious bodily harm
and damage to property. Fly only in open areas, preferably

AMA (Academy of Model Aeronautics) approved flying sites,
following all instructions included with your radio and engine.

3

Contents of Kit

Large Parts

a. Fuselage (HAN2452)
b. Wing Set with Joiner (HAN2451)
c. Tail Set (HAN2453)
d. Pushrods
e. Landing Gear Set (HAN2454)

Small Parts

1. Fuel Tank (HAN2479)

2. Engine Mount and Hardware

3. Wheel Collars

4. Clevises and Wire Keepers

5. Control Horns and Hardware

6. CA Hinges

7. Aileron Servo Mount

8. Decal Set (HAN2455) (not pictured)

Additional Required Equipment

•

4-channel radio (minimum)

•

4 standard servos (JRP5527)

•

Engine .40–.48 2-cycle

.50–.72 4-cycle

•

Standard 650mAh receiver battery

Recommended Radio Systems

•

J-Line Quattro

•

JR XF421

•

JR XF631

•

JR XP652

•

JR XP662

•

JR X-378

•

JR XP8103

Recommended Engines

2-cycle

•

Evolution Trainer Power System

•

MDS™ .40 FS Pro

•

MDS .48 FS Pro

•

Webra™ .50GT

4-cycle

•

Saito FA-50

•

Saito FA-56

•

Saito FA-65

•

Saito FA-72

J-Line Quattro

Evolution Trainer
Power System

a

b

c

d

e

1

2

3

4

5

6

7

4

Additional Required Adhesives and Tools

Adhesives

•

CA (cyanoacrylate) Glue: thick and thin

•

CA remover/debonder

•

6-minute epoxy

•

30-minute epoxy

•

Threadlock (Pacer Z42)

Tools

•

Hobby knife w/#11 blade

•

Drill

•

Drill Bits: 1/16”

•

Phillips screwdriver

•

Pliers

Other

•

Measuring device (e.g. ruler, tape measure)

•

Straight edge

•

Epoxy brushes

•

Mixing sticks

•

Rubbing alcohol

•

Paper towels

•

Wax paper

•

Masking tape

•

Felt-tipped pen/pencil

•

RC foam

Required Field Equipment

The following are included in the Hangar 9®Start-Up Field Accessory pack (HANSTART)

•

Sturdy cardboard construction tote box

•

Manual fuel pump

•

Two Hangar 9 glow plugs

•

4-way wrench

•

Rechargeable glow driver with charger

•

Chicken stick

Other Items Needed (Not included in Start-Up Field Accessory pack)

•

Fuel, 10 to 15% nitro content (Cool Power or Powermaster recommended)

•

Electric Starter w/12V battery (optional)

5

Section 1: Hinging the Ailerons

Parts Needed

• Right wing panel w/aileron

• Left wing panel w/aileron

• CA hinges (8)

Tools and Adhesives Needed

• Thin CA

• CA remover/debonder

• 6-minute epoxy

• Masking tape

• T-pins

• Rubbing alcohol

• Paper towels

Note: The photos and instructions in this section are for
the right wing panel. Repeat the same steps to hinge the
aileron on the left wing panel.

Step 1

Locate the right wing panel and remove the aileron. Note that the
leading edge of the aileron has a hole at one end that slides onto
the aileron torque rod already installed in the wing panel.

Step 2

Locate the CA hinges required for the aileron. Place a T-pin in the
center of each hinge and slide them into the precut hinge slots of
the wings trailing edge as shown.

Step 3

Trial fit the aileron to the wing; make sure there is no more than
1/32" gap along the hinge line. Once satisfied with the fit, remove
the aileron.

Step 4

Mix approximately 1/4 ounce of 6-minute epoxy. Using a tooth­pick, apply the epoxy to the inside of the hole in the aileron. Slide
the aileron onto the torque rod and hinges, being careful not to
get any epoxy into the torque rod tube. Wipe away any excess
epoxy with rubbing alcohol and paper towels. Remove the T-pins
and push the aileron completely against the wing trailing edge.
Use masking tape to hold the aileron in place until the epoxy
completely cures.

6

Section 1: Hinging the Ailerons

Note: The hinges supplied with your Alpha™ Trainer ARF
are constructed of a special material that allows the thin
CA to “wick” or penetrate and distribute throughout the
hinge, securely bonding them to the wood structure. It is
important that you properly secure the hinges in place per
these instructions using high-quality thin CA glue.

Step 5

Once the epoxy has cured, check the aileron for freedom of
movement. Fully defect the aileron down and using thin CA
saturate each hinge. Turn the wing panel over and repeat the
process saturating the hinges again from the other side. Use
CA remover/debonder and a paper towel to remove any excess
CA along the hinge line.

Step 6

Hinge the opposite wing panel and aileron by repeating Steps 2–5.

Step 7

When the CA has completely dried, test the ailerons for security.
Firmly grasp the wing and aileron and using medium pressure try
to separate the aileron from the wing. Use caution not to crush the
wing structure.

Continued

Section 2: Joining the Wing Halves

7

Parts Needed

• Right and left wing halves

• Wing joiner

Tools and Adhesives Needed

• 30-minute epoxy

• Ruler

• Felt-tipped pen or pencil

• Rubbing alcohol

• Paper towels

• Wax paper

Step 1

Locate the wing joiner. Using a ruler and felt-tipped pen or pencil,
measure and mark the exact center of the joiner as shown.

Step 2

Trial fit the wing joiner into one of the wing panels. It should
insert smoothly up to the line marked in Step 1. If the fit is too
tight, it may be necessary to lightly sand the wing joiner. Carefully
slide the other wing panel onto the joiner until the two panels
meet. The wing panels should fit together with no gaps on either
the top or the bottom of the wing.

Step 3

Use masking tape to hold the wing halves together while you
check for the correct dihedral angle. Place the wing on a large flat
surface, with one wing panel resting flat on the surface the tip of
the opposite wing panel should be 5" from the flat surface. When
you are satisfied with the dihedral, separate the wings and remove
the joiner.

Note: Read through the remaining steps of this section
before proceeding to glue the wing panels together.

Hint: It is extremely important to use plenty of epoxy when
joining the wing panels together. It will also be helpful to
use wax paper under the wing center joint to avoid gluing
the wing to your worktop.

Step 4

Mix approximately 1 ounce of 30-minute epoxy. Using an epoxy
brush, apply a generous amount of epoxy to the wing joiner cavity
of one wing panel.

Step 5

Completely coat one half of the wing joiner with epoxy up to the
mark made in Step 1. Insert the epoxy coated side of the joiner
into the joiner cavity up to the mark.

5"

8

Section 2: Joining the Wing Halves

Continued

Step 6

Apply a generous amount of epoxy to the other wing panel
joiner cavity.

Step 7

Apply epoxy to the exposed portion of the wing joiner and to both
wing roots and carefully slide both wing panels together. Firmly
press both halves together allowing the epoxy to run out. Using
alcohol and paper towels, wipe off the excess epoxy. Check to
make sure there are no visible gaps between the two wing panels.

Step 8

Use masking tape to securely hold both wing halves together.
Place the wing assembly back onto the flat work surface (covered
with wax paper) and check the dihedral again as in Step 3.

Step 9

Double-check the wing center joint for any gaps and allow the
epoxy to cure.

9

Section 3: Installing the Aileron Servo Tray

Parts Needed

• Completed wing

• Plywood servo tray

• Wood servo rails

• Aileron servo w/mounting hardware

Tools and Adhesives Needed

• 6-minute epoxy

• Thick CA

• Hobby knife

Step 1

Locate the servo tray and two servo mount rails (3/8"x 2"). Using
thick CA, glue the servo rails to the servo tray as shown. The
beveled edge of the rails should form a “V” to allow the tray to
mount to the bottom of the wing. Allow the CA to dry.

Step 2

Install the mounting hardware (rubber grommets and brass eyelets)
supplied with your radio system on to the aileron servo.
Temporarily install the aileron servo on the servo tray as shown
and test fit the entire assembly to the wing. Make sure the servo
output shaft is oriented towards the trailing edge of the wing.

Note: It may be necessary to trim away some of the sheeting
on the bottom of the wing to allow the servo to slide down
into the opening. Using a sharp hobby knife, carefully
trim only a small amount at a time.

10

Section 3: Installing the Aileron Servo Tray

Continued

Step 3

Use a felt-tipped pen or pencil to trace the outline of servo tray
onto the bottom of the wing. Remove the servo and servo tray.
Using a sharp hobby knife, cut away the covering along the line
you just traced.

Caution: Only cut deep enough to cut the covering.
Do not cut into the wood sheeting underneath.

Step 4

Mix a small amount of 6-minute epoxy (approximately 1/4 ounce)
and coat both the bare wood of the wing and the servo tray rails.
Position the servo tray on the wing and secure it with masking
tape and allow the epoxy to fully cure.

11

Section 4: Installing the Aileron Servo

and Linkages

Parts Needed

• Wing assembly

• Aileron servo

• Aileron mounting screws (4)

• Aileron control wire (2)

• Nylon clevis w/keeper (2)

• Wire keeper (2)

• Nylon horn bracket (2)

Tools and Adhesives Needed

• Thin CA

• Drill

• Drill Bit: 1/16"

• Small Phillips screwdriver

• Pliers

• Felt-tipped pen

• Ruler

Step 1

Temporarily install the aileron servo into the wing oriented as
shown. Using a felt-tipped pen, mark the location of the servo
mounting screws. Remove the servo from the wing.

Step 2

Using a 1/16" drill bit, drill the four locations marked in the previous
step for the mounting screws. Drill all the way through the servo
tray and wing sheeting. To strengthen the screw holes, place a
drop of thin CA into each hole and allow the CA to dry.

Step 3

Install the aileron servo and secure it to the wing using the
mounting screws provided with your radio system. Use caution
when installing the screws as not to contact the servo wire.

Step 4

Locate the nylon horn brackets and thread them onto the aileron
torque rods until the torque rod just begins to come through the
bracket as shown.

Step 5

Locate the aileron control wires (2) and clevises with keepers (2).
Thread a clevis onto each wire a minimum of 12 turns and connect
the clevises to the aileron horn brackets.

12

Section 4: Installing the Aileron Servo

and Linkages

Continued

Step 6

Install an “X” servo arm onto the aileron servo as shown. You
should clip off the shorter arms so they will not interfere with the
control wires. Position the servo arm so it is parallel with the
trailing edge of the wing.

Step 7

Use masking tape to hold the ailerons in their neutral position,
(even with the wings trailing edge). With the aileron servo arm at
neutral (parallel to the trailing edge of the wing), lay the aileron
control wires across the outer most hole and mark the wire with a
felt-tipped pen.

Step 8

Remove the control wires you just marked and make a 90-degree
(“L”) bend at the mark. Cut off the excess wire 5/16" past the bend.

Step 9

Install the control wires back onto the horn brackets and slide the
L-bend of the wires into the servo arm. Secure the aileron control
wire L- bends with the wire keepers as shown.

13

Section 5: Installing the Landing Gear

and Wheels

Parts Needed

• Main landing gear wire (2)

• Nose landing gear wire

• 23/4" main wheel (2)

• 21/2" nose wheel

• Large wheel collar w/setscrew (6)

• Nylon nose wheel steering block w/arm

• Nylon landing gear strap w/1/2" wood screws

Tools and Adhesives Needed

• Threadlock

• Phillips screwdriver

• Drill

• Drill Bit: 1/16"

Step 1

Locate the main landing gear wires (2) hold down straps (2) and
mounting screws (4) provided in your kit.

Step 2

Locate the main landing gear mounting location on the underside
of the fuselage and insert the wires into the predrilled holes as
shown. Note that the wires lay side by side in the precut groove in
the landing gear block.

Step 3

Locate the mounting screw holes drilled on either side of the
landing gear wires. Secure the main landing gear wires using the
straps and the 1/2" wood screws provided with your model.

Step 4

Locate the two main wheels (23/4") and 4 wheel collars
w/setscrew. Slide a wheel collar onto each axle approximately 1"
and tighten the setscrew, next slide the wheel on and then another
wheel collar. Adjust the collars so that the wheel spins freely.

Note: Use Threadlock on each setscrew to prevent the
wheels from falling off in flight.

14

Section 5: Installing the Landing Gear

and Wheels

Continued

Step 5

Locate the nose wheel steering block. Mount the steering block to
the firewall of the fuselage as shown.

Step 6

Slide the nose gear wire through the steering block and steering
arm as shown and tighten the setscrew on the steering arm to
secure the nose gear. You want the setscrew to tighten against the
flat ground into the nose gear wire.

Step 7

Install the 21/2" nose wheel using two wheel collars as you did for
the main wheels in Step 6 centering the wheel on the axle.

15

Section 6: Installing the Horizontal and

Vertical Stabilizer

Parts Needed

• Fuselage assembly

• Wing assembly

• Horizontal stabilizer

• Vertical stabilizer

Tools and Adhesives Needed

• 30-minute epoxy

• Hobby knife

• 90-degree square

• Tape measure

• Masking tape

• Rubbing alcohol

• Paper towels

Step 1

Locate the horizontal stabilizer and elevator assembly and remove
the elevator. Use a felt-tipped pen/pencil and ruler to mark the
center of the stabilizer at the trailing edge as shown. Using a
triangle, extend the center mark forward to the leading edge of
the stabilizer. Make sure the line is 90 degrees to the trailing edge
of the stabilizer.

Step 2

Mark the center of the stabilizer saddle at the trailing edge of the
saddle as shown.

Step 3

Lay the horizontal stabilizer on the saddle and align the rear mark
of the stabilizer with the mark on the saddle. Align the front of the
stabilizer with in the middle of the opening for the vertical fin.
Once you are satisfied with the alignment, carefully place a couple
of T-pins through the stabilizer and the saddle.

16

Section 6: Installing the Horizontal and

Vertical Stabilizer

Continued

Step 4

With the horizontal stabilizer properly aligned, use a felt-tipped
pen or pencil to carefully mark the bottom of the stabilizer where
it meets the fuselage.

Step 5

Remove the stabilizer. Using a sharp hobby knife, carefully
remove the covering from the center of the stabilizer, cutting 1/8"
inside the lines you marked in the previous step. Use only enough
pressure to cut the covering and not the wood underneath, as doing
so will severely weaken the structure of the horizontal stabilizer.

Step 6

Before gluing the horizontal stabilizer in place, reposition the
stabilizer onto the stabilizer saddle. Use the lines drawn in Step 4
to reposition the stab correctly. Using a 90-degree square, make
sure the stabilizer is square to the fuselage as shown. Make any
adjustment needed by sanding the stabilizer saddle until the
proper alignment is achieved. Remove the horizontal stabilizer
from the fuselage.

Step 7

Mix at least 1/ 2 ounce of 30-minute epoxy and coat the horizontal
stabilizer saddle and stabilizer center section.

Step 8

Lay the horizontal stabilizer onto the saddle, lining up the center
mark of the stabilizer with the rear of the saddle and the opening
for the vertical fin. Wipe away any excess epoxy with rubbing
alcohol and paper towels.

Step 9

Use masking tape to hold the stabilizer in place as the epoxy
cures. Allow the glue to cure before moving on to Step 10.

17

Section 6: Installing the Horizontal and

Vertical Stabilizer

Continued

Step 10

Locate the vertical fin and rudder assembly. Remove the rudder
and test fit the vertical fin in place. Make sure the rear of the fin
sits flat on the forward portion of the stabilizer. Once satisfied, use
a felt-tipped pen to mark the fin where it inserts into the fuselage.
Also mark the top of the stabilizer where the fin contacts.

Step 11

Remove the fin and use a sharp hobby knife to remove the covering
where the fin inserts into the fuselage, cutting 1/16" inside the
lines you drew in the previous step. Also cut away the covering
on top of the horizontal stabilizer, 1/16" inside the lines. Use only
enough pressure to cut the covering not the wood underneath.
Re-install the fin into the fuselage to check the fit.

Step 12

Mix at least 1/2 ounce of 30-minute epoxy and coat the vertical
fin where it meets the fuselage and stabilizer. Also coat the fin slot
in the fuselage.

Step 13

Insert the fin into the fuselage and wipe away any excess epoxy
using rubbing alcohol and a paper towel. Make sure the fin is
90 degrees to the stabilizer as shown.

Step 14

Use masking tape to hold the fin in place as the epoxy cures.
Allow the epoxy to cure before hinging the rudder.

18

Section 7: Hinging the Elevator and Rudder

Parts Needed

• Fuselage assembly

• Elevator

• Rudder

• Hinges (7)

Tools and Adhesives Needed

•Thin CA

• CA remover/debonder

• T-pins

• Rubbing alcohol

• Paper towels

Caution: The hinges included with the Alpha™ Trainer
ARF are made of a special material that allows the thin
CA to “wick” or penetrate and distribute throughout the
hinge, securely bonding them to the wood structure. It is
imperative that you properly secure the hinges in place per
these instructions using high quality thin CA glue.

Step 1

Locate the four elevator hinges, place a T-pin in the center of each
hinge and slide them into the horizontal stabilizer until the T-pin
is snug against the trailing edge as shown.

Step 2

Install the elevator onto the hinges. Remove the T-pins and push
the elevator up against the stabilizer until there is only a slight
gap (1/32" or less) at the hinge line.

Step 3

Using high-quality thin CA glue, deflect the elevator down and
completely saturate each hinge.

Step 4

Turn the fuselage over and repeat the hinge-gluing process by
deflecting the elevator in the opposite direction and again
completely saturating each hinge with thin CA. Wipe away any
excess CA with CA remover/debonder and a paper towel. Allow
the CA to completely dry.

Step 5

Once the CA has dried, check the hinges for security by trying to
pull the elevator from the stabilizer. Use only slight pressure and
be sure not to crush the wood structure of the stabilizer or elevator.

19

Section 7: Hinging the Elevator and Rudder

Step 6

Install the three rudder hinges as you did for the elevator placing
a T-pin through the center of each hinge to keep it centered while
installing the rudder. Install the rudder and remove the T-pins and
push the rudder against fin until there is only a slight gap (1/32"
or less). Deflect the rudder in one direction and using high quality
thin CA glue completely saturate each hinge.

Step 7

Deflect the rudder in the opposite direction and again saturate
each hinge with thin CA. Using CA remover/debonder wipe off
any excess CA on the rudder hinge line. Allow the CA to dry.

Step 8

Once the CA has completely dried, check the rudder for security
by trying to pull the rudder from the fuselage. Use only enough
pressure to test for security and be careful not to damage the
wood structure of the rudder or fin.

Continued

20

Section 8: Installing the Elevator and

Rudder Control Horns

Parts Needed

• Fuselage assembly

• Control horn w/back plate (2)

• Mounting screws (6)

Tools and Adhesives Needed

• Drill

• Drill Bit: 1/16"

• Felt-tipped pen or pencil

Important: When installing the control horns, it’s
important that the holes in the control horns where the
pushrod attaches are directly in line with the control
surface hinge line.

Step 1

To locate the elevator control horn position, measure the center
bottom of the elevator. Mark the elevator as shown with a felt­tipped pen or a pencil. This mark will be the center of the elevator
control horn location.

Step 2

Place the center of the control horn on the elevator at the mark
made in the previous step. Align the holes in the control with the
hinge line as noted above. Mark the mounting holes of the control
horn with a felt-tipped pen or pencil.

Step 3

Drill 1/16" holes through the elevator as marked. Make sure to
drill these holes parallel to each other to allow the back plate of
the horn to fit properly.

Step 4

Using the three screws and the back plate provided, attach the
elevator control horn and fasten in place with a Phillips screwdriver.

21

Section 8: Installing the Elevator and

Rudder Control Horns

Continued

Step 5

Measure 3/4" up from the bottom of the rudder on the left side.
Mark the location with a felt-tipped pen or pencil. This mark will
serve as the center for the rudder control horn.

Step 6

Center the control horn over the mark you’ve just made and paral­lel to the horizontal stabilizer as shown. Make sure the horn is
positioned over the hinge line, just like you did for the elevator.
Mark the mounting screw hole locations on the rudder.

Step 7

Using a 1/16" drill bit, drill the mounting screw holes on the
marks made in the previous step and install the rudder control
horn, using the three screws and back plate provided.

22

Section 9: Assembling the Fuel Tank

Parts Needed

• Metal tubes (2)

• Clunk (fuel pickup)

• Fuel pickup tubing

• Fuel tank

• Metal caps (2)

• Rubber stopper

• 3mm screw

Tools and Adhesives Needed

• Hobby knife

• Medium screwdriver

Step 1

Locate the tank parts.

Note: The stopper provided with the Alpha Trainer has
three holes that are not bore completely through the stopper.
You will only be using two holes: one for the fuel pickup
and one for the fuel vent. Make sure not to open the third
hole, as this will cause a fuel leak.

Step 2

Locate the rubber stopper. Insert the short straight metal fuel tube
into one of the holes in the stopper so that an equal amount of
tube extends from each side of the stopper. This tube will be the
fuel tank pickup that provides fuel to the engine.

Step 3

Slide the smaller of the two caps over the tube on the smaller end
of the rubber stopper. The small end will be inserted into the fuel
tank. The larger cap is placed on the other side of the rubber
stopper that makes the cap.

Step 4

Locate the other metal fuel tube with the Bend in it. This will be
the fuel tank vent tube. Slide the vent tube into one of the two
remaining holes in the stopper from the tank (small cap) side.
Loosely install the 3mm screw as shown.

Step 5

Locate the short piece of silicone fuel tubing and the fuel tank clunk.
Install the clunk onto one end of the silicone tubing and the other
end onto the fuel tank pickup tube (straight tube) in the stopper.

23

Section 9: Assembling the Fuel Tank

Continued

Step 6

Carefully insert the assembly into the fuel tank. Note the position
of the vent tube. It must be at the top portion of the fuel tank to
function properly. Also, it may be necessary to shorten the length
of the fuel pickup tubing to ensure the clunk does not rub against
the back of the fuel tank. You should be able to turn the tank
upside down, which allows the clunk to freely drop to the top of
the tank.

Step 7

Tighten the 3mm screw carefully—do not over tighten. This
allows the rubber stopper to form a seal by being slightly
compressed, thus sealing the fuel tank opening.

Step 8

Locate the two pieces of fuel tubing (red and green). Install the
red tubing onto the fuel pickup tube (the short strait tube) and
install the green tubing onto the tank vent tube (the bent tube
going to the top of the tank).

Step 9

Install the tank into the front of the fuselage with the fuel tubing
coming through the hole in the firewall.

Note: The tank will be secured in place after the radio
installation.

24

Section 10: Mounting the Engine

Parts Needed

• Fuselage assembly

• Engine mount w/hardware

• Propeller

• Spinner

Tools and Adhesives Needed

• Phillips screwdriver

• Threadlock

Step 1

Locate the supplied engine mount and mounting hardware
[8-32 x 3/4" screw (4), 8-32 x 1" screw (4), 8-32 locknuts (4),
#8 washers (4)].

Step 2

Using the 8-32 x 3/4" screws and preinstalled T-nuts, secure the
engine mount to the firewall of the Alpha. Use Threadlock on the
screws to prevent them from coming loose during flight.

Step 3

Place the engine centered between the beams of the engine mount
and using the metal clamps, 8-32 x 1" screws, locknuts and
#8 washers secure the engine in place. Be sure the nuts are
captured in the bottom of the engine mount.

Step 4

Install the muffler onto your engine, using the hardware supplied
with your engine.

Step 5

Connect the fuel pickup line (red) to the carburetor nipple and
connect the vent/pressure line (green) to the pressure nipple on
the muffler.

Note: The spinner and propeller will be installed in Section 13.

(Step 3 Photo)

(Step 3 Photo)

25

Section 11: Installing the Radio

Parts Needed

• Fuselage assembly

• Receiver

• Receiver battery

• Standard servos (3)

• RC foam

• 12" servo lead

Tools and Adhesives Needed

• Phillips screwdriver

• Hobby knife w/#11 blade

• Drill

• Drill Bit: 1/16"

Step 1

Install the mounting hardware (rubber grommets and brass eyelets)
supplied with your radio system on to the elevator, rudder and
throttle servos.

Step 2

Mount the servos into the servo tray of the fuselage as shown. Secure
the servos with the mounting screws provided with your radio system.

Step 3

Mount the battery switch to the left side of the fuselage as shown.

Step 4

Using RC foam, cut three layers of foam the size of the receiver
compartment (approximately 41/2" by 31/4"). Trace the outline of
your receiver and receiver battery pack onto one layer and cut
them out using a sharp hobby knife.

Step 5

Place one layer of foam in the fuselage and then the cut layer.
Connect the servos to the receiver in the appropriate channel.
Also connect a 12" servo lead into the aileron channel, this will
allow easy removal and installation on the wing. Run the receiver
antenna down the tube installed in the right side of the fuselage.

26

Section 11: Installing the Radio

Continued

Step 6

Place the third layer over the receiver and battery pack, leaving
the aileron servo lead free. Locate the plywood radio compartment
cover and slide it into the fuselage until it contacts the back of the
fuel tank.

Step 7

Drill a 1/16" pilot hole through the cover and into the post in the
fuselage. Secure the cover with the screw provided in the Alpha
ARF kit.

(Step 7 Photo)

(Step 7 Photo)

27

Section 12: Installing the Rudder,

Elevator and Throttle Linkage

Parts Needed

• Fuselage assembly

• Nylon clevis w/clevis keepers (3)

• L-bend keepers (3)

• Easy connector

• Control wires (4)

- 283/4" threaded on one end ............ Elevator

- 251/2" threaded on one end ............ Rudder

- 20" threaded on one end ................ Throttle

- 173/4" no threads ............................ Nose wheel steering

Tools and Adhesives Needed

• Pliers

• Side cutters

• Z-bend pliers

• Phillips screwdriver

• Felt-tipped pen/pencil

Step 1

Locate the three control wires threaded on one end and three
nylon clevises with clevis keepers. Thread a clevis onto the
threaded end of each control wire with the keeper in place as
shown. Thread each clevis on a minimum of 12 turns.

Step 2

Looking at the rear of the fuselage locate the pre-installed elevator
control wire tube. Slide the elevator control wire (283/4") through
the tube and connect the clevis to the elevator control horn.

Step 3

With the elevator at the neutral position and the elevator servo
centered, mark the control wire where it crosses the outer hole of
the servo arm.

28

Section 12: Installing the Rudder,

Elevator and Throttle Linkage

Continued

Step 4

Remove the control wire and make a 90-degree “L” bend as
shown. Cut off the excess wire 5/16" from the bend. Remove the
clevis and slide the control wire through the tube from inside the
fuselage and connect the wire to the servo arm using an L-bend
keeper. Thread the clevis back on to the wire and reconnect the
clevis to the control horn on the elevator.

Note: To prevent the control wire from binding, trim off
the servo arm pointing to the rear.

Step 5

Locate the throttle control wire (20") and slide it through the
pre-installed throttle tube in the firewall. Connect the clevis to the
throttle of your engine. With the servo centered (half throttle) and
the carburetor half open mark the throttle wire where it crosses
the outer hole of the servo arm.

Step 6

Remove the throttle control wire and make a 90-degree L-bend as
shown. Cut off the excess wire 5/16" from the bend. Remove the
clevis and slide the control wire through the tube from inside the
fuselage and connect the wire to the servo arm using an L-bend
keeper. Thread the clevis back on to the wire and reconnect the
clevis to the throttle.

Note: To prevent the control wire from binding, trim off
the servo arm pointing forward towards the engine.

Step 7

Remove the servo arm from the rudder servo. Trim off the two
shorter arms and install the easy connector included in the Alpha
hardware package as shown. Re-install the servo arm with the
easy connector positioned to the left side of the fuselage.

(Step 5 Photo)

29

Section 12: Installing the Rudder,

Elevator and Throttle Linkage

Continued

Step 8

Locate the nose wheel steering control wire (173/4" non-threaded)
and make a Z-bend on one end. Slide the wire through the
pre-installed steering tube in the firewall and through the easy
connector on the rudder servo. Remove the steering arm from
the nose gear and connect the Z-bend. Re-install the steering arm
on to the nose gear.

Step 9

With the rudder servo and nose wheel at neutral (centered), tighten
the setscrew on the easy connector.

Step 10

Locate the rudder control wire (251/2") and slide it through the
pre-installed rudder tube in the left rear top of the fuselage.
Connect the clevis to the rudder control horn. With the servo
centered and the rudder at neutral mark the rudder wire where it
crosses the outer hole of the servo arm.

Step 11

Remove the control wire and make a 90-degree L-bend as shown.
Cut off the excess wire 5/16 from the bend. Remove the clevis
and slide the control wire through the tube from inside the fuselage
and connect the wire to the servo arm using an L-bend keeper.
Thread the clevis back on to the wire and reconnect the clevis to
the control horn on the rudder.

30

Section 13: Installing the Spinner

and Propeller

Parts Needed

• Fuselage assembly

• Spinner (included)

• Evolution 3-bladed trainer propeller (EVOE100P)

Tools and Adhesives Needed

• Adjustable wrench

• Phillips screwdriver

Step 1

Remove the prop nut and washer from the Evolution engine,
noting the position of the washer and flywheel.

Step 2

Locate the spinner included in your Alpha Trainer and remove the
three self-tapping screws and remove the back plate.

Step 3

With the flywheel in place, install the spinner back plate onto the
engine as shown.

Note: The flywheel is keyed in place onto the engines crank­shaft and should be tight against the front engine bearing.

Step 4

Slide the propeller onto the engine with the molded “E” facing
forward as shown.

Step 5

Install the prop washer and prop nut removed in Step 1. Make
sure to position the beveled edge of the washer forward.

31

Section 13: Installing the Spinner

and Propeller

Continued

Step 6

Using an adjustable wrench, tighten the prop nut while holding
the propeller in place.

Warning: The propeller must be securely tightened before
attempting to run your evolution engine. Be sure to check
the security of the propeller before each flying session.

Note: The propeller must be positioned to allow the
spinner cone to fit into the slots in the back plate. Test fit
the spinner cone before attempting to install the self­tapping screws of the spinner.

Step 7

Using a Phillips head screwdriver, secure the spinner cone in
place with the three self-tapping screws provided.

32

Section 14: Balancing and Control

Throw Recommendations

Parts Needed

• Fuselage assembly

• Wing assembly

• Wing dowels (2)

• #64 rubber bands (10) (included)

Step 1

Install the two wing dowels through the holes located at the front
and rear of the wing saddle. Leave an equal amount extending
from the sides of the fuselage.

Step 2

Mount the wing onto the fuselage using the #64 rubber bands
provided. Be sure to connect the aileron servo lead to the aileron
extension lead you connected to the aileron channel of your receiver.

The following control throws are recommended for your first
flights. We recommend only one rate setting for the Alpha Trainer,
as you gain flight experience and become more familiar with the
handling of your model you may wish to add a second rate set­ting. We also recommend that you have an experienced modeler
help you with control throws and CG set-up of your Alpha ARF.
Your local hobby shop can put you in contact with the RC clubs
in your area.

Recommended Control Throws

Aileron 5/16” up 1/4” down
Elevator 3/8” up 3/8” down
Rudder 3/4” right and left

Recommended CG Location

An important part of preparing the aircraft for flight is properly
balancing the model. This is especially important when various
engines are mounted.

Caution: Do not inadvertently skip this step!!

The recommended Center of Gravity (CG) location for the Alpha
Trainer ARF is a range from 2

3

/4" to 3" behind the leading edge of

the wing measured at the fuselage sides.

If necessary, move the battery pack or add weight to either the
nose or the tail until the correct balance is achieved. Stick-on
weights are available at your local hobby shop and work well for
this purpose.

(Step 2 Photo)

23/4"

3"

33

Preflight Checks at the Flying Field

Important: Be sure your batteries are fully charged, per
the instructions included with your radio system.

Before each flight, check the screws and nuts that secure the
metal plate holding the motor in place on the motor mount.
Also check the clevises of each control surface for security and
presence of a clevis keeper.

Perform a ground range check before each day’s flying.
Proceed as follows:

1. Do not extend the transmitter antenna. Turn the
transmitter on.

2. Turn the model on.

3. Slowly walk away from the model while moving the
control surfaces. The aircraft should function properly
at a distance of 75–100 feet.

4. Make sure all trim levers on the transmitter are in the
proper position.

5. Make sure all servos and switch harness plugs are secure
in the receiver.

Flying Your Alpha Trainer

For first-time pilots, the thought of flying their Alpha Trainer
through loops, rolls, and perfect three-point landings can be
thrilling. Learning to fly, however, takes time, patience, and most
importantly, a good instructor. If you’re a first-time pilot, don’t try
to fly your model without an instructor. Seek an experienced
instructor. Your local hobby shop can put you in touch with an
instructor in your area who can fly and trim your Alpha Trainer,
and then give you your first chance on the “sticks” with very little
risk of damage to the airplane. We cannot over emphasize the

importance of having a qualified instructor to help you through
your first flights.

More experienced pilots will find the Alpha Trainer to be a
confidence-inspiring airplane. Super stable and slow flight
characteristics make pinpoint landings easy as pie. At full throttle,
the Alpha Trainer is more than capable of most sport aerobatics
maneuvers. The self-righting stability of the model also makes it
one of the easiest airplanes you’ll ever fly.

34

2002 Official AMA National Model
Aircraft Safety Code

Effective January 1, 2002

Model Flying MUST be in accordance with this Code in
order for AMA Liability Protection to apply.

General

1) I will not fly my model aircraft in sanctioned events, air
shows, or model flying demonstrations until it has been
proven to be airworthy by having been previously,
successfully flight-tested.

2) I will not fly my model higher than approximately 400 feet
within 3 miles of an airport without notifying the airport
operator. I will give right-of-way and avoid flying in the
proximity of full-scale aircraft. Where necessary, an observer
shall be utilized to supervise flying to avoid having models
fly in the proximity of full-scale aircraft.

3) Where established, I will abide by the safety rules for the flying
site I use, and I will not willfully and deliberately fly my models
in a careless, reckless and/or dangerous manner.

4) At all flying sites a straight or curved line(s) must be
established in front of which all flying takes place with the
other side for spectators. Only personnel involved with flying
the aircraft are allowed in front of the flight line. Flying over
the spectator side of the line is prohibited, unless beyond the
control of the pilot(s). In any case, the maximum permissible
takeoff weight of the models with fuel is 55 pounds.

5) At air shows or model flying demonstrations a single straight
line must be established, one side of which is for flying, with
the other side for spectators. Only those persons accredited
by the contest director or other appropriate official as necessary
for flight operations or as having duties or functions relating
to the conduct of the show or demonstration are to be permitted
on the flying side of the line. The only exceptions that may be
permitted to the single straight-line requirements, under special
circumstances involving consideration of site conditions and
model size, weight, speed, and power, must be jointly
approved by the AMA President and the Executive Director.

6) Under all circumstances, if my model weighs over 20 pounds,
I will fly it in accordance with paragraph 5 of this section of
the AMA Safety Code.

7) I will not fly my model unless it is identified with my name
and address or AMA number, on or in the model.

Note: This does not apply to models while being flown

indoors.

8) I will not operate models with metal-bladed propellers or
with gaseous boosts, in which gases other than air enter their
internal combustion engine(s); nor will I operate models
with extremely hazardous fuels such as those containing
tetranitromethane or hydrazine.

9) I will not operate models with pyrotechnics (any device that
explodes, burns, or propels a projectile of any kind) including,
but not limited to, rockets, explosive bombs dropped from
models, smoke bombs, all explosive gases (such as hydrogen
filled balloons), ground mounted devices launching a projectile.
The only exceptions permitted are rockets flown in accordance
with the National Model Rocketry Safety Code or those
permanently attached (as per JATO use); also those items
authorized for Air Show Team use as defined by AST Advisory
Committee (document available from AMA HQ). In any case,
models using rocket motors as a primary means of propulsion
are limited to a maximum weight of 3.3 pounds and a G series
motor. A model aircraft is defined as an aircraft with or without
engine, not able to carry a human being.

10) I will not consume alcoholic beverages prior to, nor during,
participation in any model operations.

Radio Control

1) I will have completed a successful radio equipment ground
range check before the first flight of a new or repaired model.

2) I will not fly my model aircraft in the presence of spectators
until I become a qualified flier, unless assisted by an
experienced helper.

3) I will perform my initial turn after takeoff away from the pit or
spectator areas, and I will not thereafter fly over pit or spectator
areas, unless beyond my control.

4) I will operate my model using only radio control frequencies
currently allowed by the Federal Communications Commission.
(Only properly licensed Amateurs are authorized to operate
equipment on Amateur Band frequencies.)

5) Separation of less than three miles between flying sites is
only acceptable if testing has been accomplished to determine
that no interference potential exists or a frequency sharing
arrangement between the clubs and/or individuals involved
is developed. Written confirmation of either of these two
alternatives, signed by a club officer of both clubs, or
individual AMA members from both clubs shall be provided
to AMA Headquarters.

6) For Combat, distance between flight line and spectator line
will be 500 feet per cubic inch of engine displacement.
(ex: .40 engine = 200 feet)

35

7) An RC racing event, whether or not an AMA Rule Book event,
is one in which model aircraft compete in flight over a
prescribed course with the objective of finishing the course
faster to determine the winner.

A. In every organized racing event in which contestants,

callers and officials are on the course:

1. All officials, callers and contestants must properly
wear helmets that are OSHA, DOT, ANSI, SNELL or
NOCSAE approved or comparable standard while
on the racecourse.

2. All officials will be off the course except for the
starter and their assistant.

3. “On the course” is defined to mean any area beyond
the pilot/staging area where actual flying takes place.

B. I will not fly my model aircraft in any organized racing

event which does not comply with paragraph A above
or which allows models over 20 pounds unless that
competition event is AMA sanctioned.

C. Distance from the pylon to the nearest spectator (line) will

be in accordance with the current Competition Regulations
under the RC Pylon Racing section for the specific event
pending two or three pylon course layout.

8) R/C Night Flying is limited to low-performance models (less
than 100 mph). The models must be equipped with a lighting
system that clearly defines the aircraft’s attitude at all times.

2002 Official AMA National Model
Aircraft Safety Code

Continued

© Copyright 2002, Horizon Hobby, Inc. 1-800-535-5551

www.horizonhobby.com

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