Hangar 9 PT-19 Instruction Manual
INSTRUCTION MANUAL
WE GET PEOPLE FLYING
TM
TM
• 90% pre-built
• IMAA Giant Scale legal
• Pre-covered in genuine UltraCote
®
,featuring full scale trim scheme
• Pre-finished fiberglass cowl
• Gas or glow option
PT-19
Giant Scale 1.20 ARF
Specifications:
Wingspan:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82" / 208.3 cm
Length:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63.5" / 161.3 cm
Wing Area: . . . . . . . . . . . . . . . . . . 1010 sq.in. / 6516.5 sq.cm.
Weight (Approx.):. . . . . . . . . . . 13–16 lbs. / 5896–7257 grams
Recommended Engines: 1.08–1.20 2-Stroke
1.20–1.50 4-Stroke
Zenoah G23 Gas or Glow
UltraCote
®
is a registered trademark of Carl Goldberg Models,Inc.
2
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Warning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Additional Equipment Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Parts Needed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Tools and Supplies Needed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Contents of Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section 1: Hinging the Ailerons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Section 2: Joining the Wing Halves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Section 3: Installing the Aileron Servos. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Section 4: Installing the Aileron Linkages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Section 5: Mounting the Wing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Section 6: Installing the Tail (Vertical Fin and Horizontal Stabilizer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Section 7: Hinging the Horizontal Stabilizer and Elevators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Section 8: Hinging the Rudder and Installing the Tail Wheel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Section 9: Installing the Control Horns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Section 10: Installing the Main Landing Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Section 11: Installing the Engine (2- or 4-Cycle) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Section 12: Installing the Engine (Gas Option). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Section 13: Assembling and Installing the Fuel Tank (Glow/Gas) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Section 14: Installing the Radio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Section 15: Installing the Control Linkages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Section 16: Attaching the Cowling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Section 17: Attaching the Windscreens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Section 18: Application of Decals and Scale Detailing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Section 19: Control Throw Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Section 20: Balancing the PT-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Pre-Flight Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Pre-Flight at the Field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
AMA Safety Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
3
Introduction
Congratulations on your purchase of one of the finest giant scale ARFs to be produced! The Hangar 9 Fairchild PT-19 trainer is a
semi-scale aircraft suited for the intermediate to advanced level flyers and modelers. Although this is an ARF (Almost -Ready-to-Fly)
kit, it does have some construction features that can be challenging for the new modeler. 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 PT-19. You can contact us at:
Horizon Hobby Distributors
4105 Fieldstone Road
Champaign, IL 61822
(217) 355-9511
www.horizonhobby.com
The Fairchild PT-19A, used as the model for this kit, was the first of a family of primary trainers used by the then United States Army Air
Corps. Numerous variations were to come, as were similar aircraft from Ryan and other small aircraft manufacturers during the pre-World
War II era. This is a “giant scale” model, however the experienced modeler has in this kit the basic components that will allow for numerous variations. If you decide to make such a variation, we would be very interested in learning about your effort. Remember, any changes
in the basic parameters of the kit could result in a model that does not perform as this kit has been designed to do. Our research and
development staff have built numerous prototypes leading up to this production version. Please be sure to read Section 20 on Balancing
the Aircraft. We believe this information is very important for the modeler to ensure the aircraft is a safe and satisfactory flyer.
Warning
An R/C aircraft is not a toy! If misused 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.
Additional Equipment Required
Radio Equipment
5 channels (minimum)
5 servos with 50 in./oz. torque minimum
Standard 600–1000 mAh receiver battery pack
Y-harness (if a non-computer radio is used)
Recommended JR Systems
JR XP642
JR XP783
JR XP8103
PCM10X
Engine Requirements
1.08-1.2 2-cycle engines
1.20-1.50 4-cycle engines
23 cc gas
Recommended 2-Cycle
Engine
Webra 1.20
Recommended 4-Cycle
Engines
Saito 1.20-1.50
Saito 1.20GK-1.50GK
Recommended Gas Engine
Zenoah G23 Gasoline Engine
4
Aileron Extension (2) (JRPA114, 12" Silver) Fueler Valve
Propeller Kill switch and hardware (if using a gas engine)
Foam for cushioning tank
Fuel tubing (use gas fuel tubing for gas engine)
Fuel Filter
Parts Needed
Adhesives
Thin CA (cyanoacrylate) glue
Thick CA (cyanoacrylate) glue
6-minute epoxy
12-minute epoxy
30-minute epoxy
Blue Threadlock Z-42
Canopy glue (R/C 56)
Silver solder (Stay Brite)
Tools
Drill
Drill bits: 1/16", 1/8", 5/32", 1/4", 3/8”
Soldering iron
Small Phillips screwdriver
Medium Phillips screwdriver
Z-bend pliers
Pliers
1/16" hex wrench
Small round file
Moto-Tool with sanding drum
Hobby knife with #11 blade
Mixing stick
Epoxy brush
90-degree triangle
Sanding sticks (medium)
Medium sandpaper
Masking tape
Straight edge
Measuring device (e.g., ruler, tape measure)
Scissors
Paper towels
Wax paper
Rubbing alcohol
Felt tipped pen or pencil
Optional Equipment
Radio packing foam
Antenna tube
Tools and Supplies Needed
5
Contents of Kit
Large Parts
A. Fuselage
B. Left wing half with aileron
C. Right wing half with aileron
D. Vertical stabilizer with rudder
E. Horizontal stabilizer with elevators
F. Cowl
Other Parts (not pictured)
• Pushrod and accessories
• 1/8" plywood die-cut parts
• Main landing gear
• Hardware bag
• Wheels
• Fuel tank and hardware
• Decal sheet
• Metal motor mounts/hardware
• Windshield material
• Tail wheel and hardware
A
B
C
D
E
F
6
Note: The control surfaces, including the ailerons, elevators
and rudder, come with the hinges installed, but the
hinges are not glued in place. It’s imperative that you
use a high quality thin CA glue to properly adhere the
hinges and ailerons in place per the steps that follow.
Step 1. Carefully remove the aileron from one of the wing panels. Note the position of the hinges. The PT-19 comes with high
quality CA-type hinges.
Step 2. Remove each hinge from the wing panel and place a
T-pin in the center of each hinge. Slide each hinge into the
wing panel until the T-pin is snug against the wing.
Step 3. Slide the aileron onto the wing until there’s only a
slight gap. The hinge is now centered on the wing panel and
aileron. Remove the T-pins and snug the aileron against the
wing panel. This will ensure that the hinges are centered.
Step 4. Deflect the aileron and completely saturate the hinge
with thin CA glue. The aileron’s front surface should lightly contact the wing during this procedure. Ideally, when the hinge is
glued in place, a 1/32" gap or less will be maintained throughout
the length of the aileron. The hinge is constructed of a special
material that allows the CA to wick, or penetrate, and distribute
throughout the hinge, securely bonding it to the wood structure.
Step 5. Turn the wing panel over and deflect the aileron in the
opposite direction from the opposite side. Apply thin CA glue to
each aileron hinge, making sure the CA penetrates into both the
aileron and the wing.
• Right wing panel with aileron and hinges
• Left wing panel with aileron and hinges
• Instant thin CA glue
• CA remover/debonder
• Paper towels
• T-pins (one for each hinge)
Section 1: Hinging the Ailerons
Parts Needed Tools and Adhesives Needed
7
Step 6. Using CA remover/debonder and a paper towel, remove
any excess CA glue that may have accumulated on the wing or
in the aileron hinge area.
Step 7. Repeat this process with the other wing panel, securely
hinging the aileron in place.
Step 8. After both ailerons are securely hinged, firmly grasp the
wing and aileron and check that the hinges are securely glued
and cannot be pulled out. To do this, apply medium pressure to
try to separate the aileron from the wing. Use caution that you
do not crush the wing structure.
Note: Work the aileron up and down several times to “work
in” the hinges and check for proper movement.
Section 1: Hinging the Ailerons
CONTINUED
8
Step 1. Locate the dihedral brace (also called the wing joiner).
Using a ruler, determine the center of the brace and mark it with
a pencil.
Step 2. Trial fit the dihedral brace into one of the wing panels.
It should insert smoothly up to the center line marked in Step 1.
Now slide the other wing panel onto the dihedral brace until the
wing panels meet. If the fit is overly tight, it may be necessary to
sand the dihedral brace. Check to make sure the alignment of
the wing is accurate.
Step 3. Check for the correct dihedral angle. Place the wing on
a large flat surface with one wing panel resting on the flat surface. The opposite wing tip should be at 61/4
" in height from the
surface (Note: That’s at the last rib, without the tip section; see
illustration below). If necessary, sand the dihedral brace until
this is achieved.
Note: It’s a good idea to make a gauge that can be placed
under the wing to hold it at 6
1
/4" when epoxying wing
halves together.
Step 4. Separate the wing halves and remove the dihedral
brace. Once you’re satisfied with the trial fit of the wing panels,
you can prepare to epoxy the wing panels together.
Step 5. Note: Use the plastic wing covers as a means of keeping epoxy from smearing on the wings. Just slip one on each
panel and use masking tape to hold in place.
Mix up approximately one ounce of 30-minute epoxy. It’s helpful
to have some wax paper handy to prevent epoxy from dripping
on your workbench top. Note: It’s extremely important to use
plenty of epoxy.
• Right/Left wing panels
• Plastic wing bags (optional)
• Dihedral brace
• 30-minute epoxy
• Epoxy brush
• Masking tape
• Rubbing alcohol
• Paper towels
• Wax paper
• Ruler
• Pencil
• Medium sandpaper
• Mixing stick
at last rib without
tip section
6
1
/4"
Section 2: Joining the Wing Halves
Parts Needed Tools and Adhesives Needed
wing bag
tape
9
Step 6. Place one wing half right side up on a flat work surface.
Use a scrap piece of wood or an epoxy brush and smear a generous amount of epoxy into the wing dihedral brace cavity in the
wing panel.
Step 7. Coat one half of the dihedral brace with epoxy on both
sides, up to the pencil line drawn in Step 1. Note the orientation of
the wing brace — the “V” points to the top of the wing, or faces
up, when the wing panel is placed on the workbench top-side up.
Install the epoxy-coated half of the dihedral brace into the wing
joiner cavity of the wing panel, up to the centerline, making sure
the “V” of the dihedral brace is orientated correctly. Use rubbing
alcohol and a paper towel to clean up any excess epoxy.
Step 8. Apply a generous amount of epoxy into the wing brace
cavity of the other wing panel.
Note: You’ll need to mix up an additional 1-2 ounces of
epoxy to complete the wing joining process.
Step 9. Next, apply epoxy to all sides of the exposed area of the
dihedral brace and uniformly coat both wing roots with epoxy.
Section 2: Joining the Wing Halves
CONTINUED
10
Step 10. Carefully slide the two wing halves together and firmly press them together, allowing the excess epoxy to run out.
Also, check to make sure the wing panels align properly. Wipe
any excess epoxy away with rubbing alcohol and a paper towel.
At this time, remove the wing bags.
Step 11. Apply masking tape at the wing joint to hold the wing
halves together securely. Place the wing right side up on a flat
surface. With one wing half lying flat on the surface, the opposite wing tip should be propped such that it’s 61/4" from the surface. Apply more masking tape to the wing center joint and
recheck the 61/4" measurement. Also make sure the wing halves
are still properly aligned. Allow the wing joint epoxy to cure
completely (overnight).
Note: It’s helpful to use wax paper underneath the wing cen-
ter while the epoxy is curing so any excess epoxy will
not adhere to the work area surface.
Step 12. Allow the wing center joint to cure completely, then
remove the masking tape.
Note: If there is any gap between the wing halves, fill with
epoxy.
Section 2: Joining the Wing Halves
CONTINUED
11
Step 1. Locate the servo openings in the bottom of each of the
wing halves. Using a sharp hobby knife, trim away the covering
over the openings.
Step 2. Install the recommended servo hardware supplied with
your radio system onto your servos (grommets and eyelets).
Install a servo extension lead to the servo as well (a 12" extension is recommended). Secure the connectors with either masking tape or a commercial connector that prevents the servo connections from becoming disconnected.
Hint: It’s always a good idea to tape or secure the servo con-
nectors and servo extension together to prevent the
wires from becoming unplugged inside the wing.
Step 3. Trial fit the servo into the ser vo opening. Depending
upon the type of servo installed, some trimming may be
required. Note that we have orientated the servo so the servo
arm is closer to the trailing edge of the wing.
Step 4. With the servo in place, mark the location of the servo
screws that are used to mount the servo to the plywood rail
inside the servo opening in each wing half.
• Assembled wing
• Standard size servos (2)
• Servo extensions (2)-(12" recommended-JRPA114)
• Music wire (1) (36")
• Y-harness (if using a non-computer radio)
• Hobby knife
• Phillips screwdriver (medium)
• Drill
• 1/16" drill bit
• Masking tape
• Pencil
• Needle nose pliers
Section 3: Installing the Aileron Servos
Parts Needed Tools and Adhesives Needed
12
Step 5. Using a 1/16" drill bit, drill the servo screw locations
marked in Step 4.
Step 6. Before mounting the servo, it’s a good idea to run the servo
lead and extension through the wing and out the opening provided
for each at the wing center on the top of the wing. Turn the wing
over so the wing is right side up and look carefully for an oblong
opening near the center of the wing of each wing panel. Using a
sharp hobby knife, trim away the covering to expose the opening,
making sure to use caution so as not to cut into the wing sheeting.
Step 7. Using a small diameter piece of music wire (36" long),
thread the music wire through the servo lead opening in one of
the wing panels on the top side of the wing. Use care to make
sure you don’t crush any of the wing structure, or puncture the
wing covering. Turn the wing over and carefully guide the music
wire until you can see it in the servo opening in the wing bottom.
A needle nose pliers can be used to grasp the wire and pull it out
of the opening. The wire can be started either way, but we found
it easier to get the wire out using the method described above.
An optional method is to use a 16" piece of string with a weight
(such as a nut) attached and threaded down the servo opening
and out the servo lead opening at the wing center.
Step 8. Once you have the music wire threaded through the wing,
make a small hook on one end and tape it to one end of the servo
lead extension. Carefully thread the wire and extension through the
wing. Mount the servo using the screws provided with your servo.
Step 9. To prevent the extension from falling back inside the
wing, use masking tape to temporarily hold it in place by taping
the extension to the top of the wing.
Step 10. Repeat the procedure for the other servo.
Note: If using a non-computer radio, it will be necessary to
use a Y-harness to connect both aileron servos to the
aileron channel.
Section 3: Installing the Aileron Servos
CONTINUED
13
Step 1. Turn the wing upside down. From the aileron servo
control arm that’s attached to your servo (if it’s not attached, do
so now), use a felt tipped pen and ruler to mark the location of
the control horn, directly in-line and/or perpendicular to the
leading edge of the aileron with the servo control arm as shown.
Remember to locate the control horn so the clevis holes are as
close as possible above the hinge line of the aileron.
Step 2. Place the center of the control horn on the aileron at
the mark made in the previous step. Mark the hole positions of
the control horn.
Step 3. Remove the control horn and drill two 1/16" holes
through the aileron as marked.
Note: The trailing edge of the aileron should be in line with
the rest of the wing. Drill straight down at a 90° to the
flat surface (table).
Step 4. Attach the aileron control horn using the hardware provided (two long screws and a plastic back plate) and fasten it in
place using a small Phillips screwdriver.
• Wing assembly from Section 3
• Aileron linkages (2mm x 7-7/8" — threaded on one end) (2)
• Control horns (2)
• Screws (4)
• Clevis (2)
• Plastic control horn plates (2)
• Drill
• 1/16" drill bit
• Z-bend pliers (optional)
• Small Phillips screwdriver
• Felt tipped pen
• Masking tape
• Fuel tubing (optional)
• Ruler
Section 4: Installing the Aileron Linkage
Parts Needed Tools and Adhesives Needed
90°
14
Step 5. Repeat the marking and attachment procedure for the
other aileron control horn.
Step 6. Locate the two threaded aileron 2mm wire linkages
(2mm x 77/8"). Thread a clevis at least 16 turns onto each rod. Be
sure these are not the longer music wire control rods.
Step 7. Install the clevis with the attached linkage to the aileron
control arm. Center the servo arm as shown and, using a felt
tipped pen, make a mark on the linkage where the Z-bend will be
inserted into the servo arm. Make sure the aileron is at 0°
deflection. Hold in place with masking tape if necessary.
Step 8. Make a Z-bend in the linkage and cut-off the excess
wire.
Step 9. Center the servo arm and install the Z-bend into the
outermost hole. Do the same for the other aileron linkage.
Step 10. Attach the linkages onto their respective aileron control horns.
Step 11. With the servo arm centered as shown, adjust the aileron
linkage until the aileron is exactly in the neutral position. Follow this
procedure for the other aileron linkage. Final adjustments will be
made later as you adjust the control throws in Section 19.
Note: It is a good idea to place a piece of fuel tubing (7mm
in length) over the clevis as shown. This will provide
extra insurance against the clevises accidentally coming open.
NYLON
CLEVIS
THREADED ROD
2X20mm BOLT
NYLON CONTROL HORN SET
LEFT BOTT OM WING
SERVO
LEAD
Section 4: Installing the Aileron Linkage
CONTINUED
15
Step 1. Locate the four wing dowel holes. First, locate the two
that are located inside the fuselage bottom where the leading
edge of the wing rests. (Note: They are oblong shaped.)
Step 2. Next, locate the two holes in the leading edge of the wing.
You may need to trim the covering over the holes. Trial fit the wood
dowels before mixing the epoxy. Mix a small amount of 12-minute
epoxy, approximately 1/2 ounce, and apply it to the two wooden dowels. Insert the dowels in the wing holes. Position the dowels so they
protrude 1/2" out from the leading edge of the wing. Let the epoxy
cure completely before trying to insert the wing into the fuselage.
Step 3. You can mount the yellow covered plywood wing bolt
plates now.
Note: The covering will have to be trimmed away from the area
of the bottom of the wing so the plate can be epoxied to the
wing.
Trial fit the piece, marking its location with a pencil. Use a sharp
hobby knife to trim away the covering. CAUTION: Be careful to
not cut into the wood as this can weaken the structure.
Step 4. Note that the wing bolt plate has the holes already
drilled out for the wing hold-down bolts. It is important that the
holes in the plates are oriented exactly as in the photo. These
holes will serve as a template later. Mix up 1/2 ounce of 6minute epoxy and epoxy the wing bolt plate to the bottom of the
wing. Allow the epoxy to cure completely.
• Complete wing assembly
• Fuselage
• Wing dowel rods (2)
• Fuselage wing hold-down screws/washers (2)
• Blind nuts (2)
• CA glue (medium)
• Drill
• 1/4" drill bit
• Medium Phillips screwdriver
• Small round file
• Hobby knife
• 12-minute epoxy
• 6-minute epoxy
• Measuring device (e.g., 36" ruler or tape measure)
• Masking tape
• Rubbing alcohol
• Paper towels
Section 5: Mounting the Wing
Parts Needed Tools and Adhesives Needed
16
Step 5. The fuselage wing hold-down plate is located toward
the rear of the fuselage wing opening.
Step 6. For a reference point, turn the fuselage upside down
and place a small piece of masking tape centered on the bottom
of the aft portion of the fuselage as shown below. This point will
serve as a reference point when the wing alignment is checked.
Step 7. Carefully fit the wing into position on the fuselage, sliding
the leading edge dowels into the fuselage front wing dowel support
bulkhead. Some trimming of the wing bolt hole openings may be
necessary in the following steps when the wing alignment is checked.
Step 8. With a reference point established, and prior to drilling
the wing hold-down holes, check the wing alignment by measuring from each wing tip to the fuselage tail reference point. Be
sure to use the same point on each wing tip exactly the same
distance on each side from the center wing. The measurements
on each side should be the same.
Step 9. Once you’re satisfied with the alignment, you’re ready
to drill the wing hold-down bolt holes. Using a 3/8" drill bit, and
the wing bolt plate holes as a guide, drill through at a 90° angle
from the wing into the fuselage and through the plywood wing
hold-down plate. After drilling the holes, remove the wing.
Step 10. Press the blind nuts into position below the rear wing
hold-down block in the rear portion of the fuselage wing area. Use
pliers with an adjustable opening to squeeze the blind nuts so the
“teeth” penetrate the wood and stay in place. Note: It is important
that the blind nuts be fully pressed in against the bottom of the
wing hold-down block to make sure they are properly aligned.
This sets the alignment angle of the wing hold-down bolts.
Note: It is a good idea to place a piece of wood on the top
side of the wing bolt hold-down block to keep from
crushing the wood.
Section 5: Mounting the Wing
CONTINUED
17
Step 11. A small drop of medium CA glue will help hold the
blind nuts in place. Use care not to get the CA on the inner
threads of the blind nuts. Apply the CA from underneath.
Step 12. Trial fit the wing into position on the fuselage. Thread
the wing hold-down screws into the wing and loosely tighten.
Check the alignment of the wing by measuring the alignment as
you did in Step 9. It may be necessary to slightly enlarge the
holes with a small round file to obtain the proper alignment.
Step 13. Locate the yellow wing center tape. Apply to the top
and bottom of the wing center using a covering iron.
Section 5: Mounting the Wing
CONTINUED
18
Section 6: Installing the Tail (Vertical Fin &
Horizontal Stabilizer)
• Fuselage
• Wing
• Horizontal stabilizer with elevators
• Vertical fin with rudder
• Thin CA glue
• CA remover/debonder
• 30-minute epoxy
• Epoxy brush
• Hobby knife with #11 blade
• Straight edge
• Pencil
• Felt tipped pen
• Masking tape
• Rubbing alcohol
• Paper towels
• 90 degree triangle
• Ruler (36")
Parts Needed Tools and Adhesives Needed
Step 1. On the rear of the fuselage, slots are pre-cut in the
wood structure for the horizontal stabilizer and the vertical fin.
You’ll need to trim away the covering with a sharp hobby knife,
being very careful not to cut or score the wood underneath.
Step 2. The horizontal stabilizer will be mounted to the fuselage
first. Remove the two elevator halves from the horizontal stabilizer.
Measure to exact center of trailing edge and mark with felt tipped
pen.This will serve as a reference point when installing the horizontal stabilizer onto the fuselage.
Step 3. Slide the horizontal stabilizer carefully into the slot provided in the fuselage. You may have to trim the opening to allow
the horizontal stabilizer to be inserted. Use care not to force the
horizontal stabilizer in as you may crush the wood.
Step 4. Locate the center line of the fuselage and put a reference mark there. Then, using a long straight edge, measure from
the reference point on the fuselage to the tip of the horizontal
stabilizer on both the left and right side. Adjust the stabilizer
position until both the right and left measurements are the same.
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