AeroWorks SU-31 User manual

SU-31 PROFILE ELECTRIC
ARF
ASSEMBLY MANUAL
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TABLE OF CONTENTS
Page
Aeroworks Contact Information …………………………………………………………........ 3
Introduction …………………………………………………………………………………….. 4
Kit Contents……………………………………………………………………………………... 5
Items needed to complete ……………………………………………………………………… 6
Wing Assembly…………………………………………………………………………………. 7
Stab Assembly …………………………………………………………………………………. 10
Flight Control Assembly ……………………………………………………………………… 12
Wheels and Motor Assembly …………………………………………………………………. 18
Servos and Radio Installation ………………………………………………………………… 21
Preflight Preparation …………………………………………………………………………… 26

401 Laredo Unit “D”
Aurora, CO 80011
Phone: [phone]
Fax: [phone]
Website: www.aero-works.net
E-mail: [email protected]
Thank you for choosing the Aeroworks SU-31 Profile Electric ARF. We have put allot of effort into making this
plane the best aerobatic model you will ever build and fly. Consideration was given to provide you with the highest
quality and performance plane possible. We wish you great success in the assembly and flying of your new
Aeroworks SU31.
WARNING
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An R/C aircraft is not a toy! If misused, it can cause serious bodily harm and property damage. Fly only
in open areas, and AMA (Academy of Model Aeronautics) approved flying sites. Follow all instructions
included with your plane, radio, and engine.

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INTRODUCTION
Your new SU-31 Profile Electric ARF is a highly aerobatic airplane. It is capable of all styles of
flying, from gentle and stable slow flight, sport aerobatics, to full out 3D type maneuvers. We hope you
enjoy building and flying your SU-31. This aircraft builds easily, quickly, and accurately due to the
CAD design and LASER cutting technology. The wing, stab and fuse are pre-assembled and covered
requiring only a minimum amount of gluing or drilling.
The SU-31 Profile Electric ARF is transported completely assembled. This eliminates assembly
time when you get to the flying field. The battery installs easily with Velcro to get you into the air
quickly to enjoy high performance aerobatic flying.
The SU-31 Profile Electric ARF is designed for electric motors in the 370-400 size range.
A Himax Outrunner Brushless Motor (HC 2812-1200). is shown in the assembly instructions. The
aircraft was test flown using a Li-polymer 3 cell, 11.1 Volt 1200 to 1320ma battery, and 11 x 4.7 APC-E
propeller and has excellent performance. The final choice of motor and battery is left up to the builder.
A computer radio is recommended to allow the pilot to take full advantage of the capabilities of this
aerobatic aircraft.
Before starting the assembly of your new SU-31 ARF, please inventory and inspect all parts and
hardware for imperfections or damage. Notify AEROWORKS immediately if there are missing or
damaged parts.
IMPORTANT! Please read through the assembly manual carefully and follow the order of
assembly before you start building the aircraft. This will help save time and eliminate any chances of
building errors.
INTENDED USE
This plane should not be regarded as a toy. This is an aerobatic plane and is recommended for pilots who
are beyond the trainer-stage and are comfortable with flying an aerobatic sport plane.
WARRENTY
It is important to notify Aeroworks of any damage or problems with the model immediately. If
you wish to return this aircraft for any reason a 15% restock fee will be charged to the customer. In
addition the customer is responsible for all return shipping cost and all prior shipping cost will not be
refunded. Parts will be exchanged/replaced once the original item is returned at the owner’s expense. If
you have any problems, contact Aeroworks.
Aeroworks cannot insure the skill of the modeler and can not influence the builder during the
construction or use of this aircraft, therefore, will not be accountable for any property damage, bodily
injury or death caused by this aircraft.
The purchaser/operator accepts all responsibility of any and all structural or
mechanical failures.

KIT CONTENTS
SU-31 Profile Electric ARF Parts List
1. Wing assembled and covered
• Aileron servo bays opened up
• CA hinge slots pre-cut
2. 2 Ailerons covered
• CA hinge slots pre-cut
3. Horizontal Stabilizer and Elevator covered
• Elevators in place with CA hinges not glued
4. Fuselage and vertical fin assembled and covered
• Battery Velcro strap installed
• Landing gear mounts pre-drilled
• Rudder in place with CA hinges not glued
5. Rudder covered
• CA hinge slots pre-cut
6. Landing gear parts
• 2 Main landing wire struts pre-bent
• 2 Main wheels
• 2 Wheel collars and spacers
• 2 Nylon wire ties
7. Control system parts with nylon R/C keepers for
ailerons and elevator
• 4 wire pushrods
• 4 nylon R/C keepers
• 4 nylon control horns
• 4 easy links
• 2 Velcro battery pack self stick strips
• 11 CA hinges
8. Decal sheet
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Items needed to complete:
Hardware:
• Motor, mount
Recommended (Himax HC 2812-1200)
• Propeller
Recommended (APC-E 11 x 4.7)
• 2 x aileron servos
Recommended (Hitec HS-55 Feather)
• 1 x rudder servo
Recommended (Hitec HS-55 Feather)
• 1 x elevator servo
Recommended (Hitec HS-55 Feather)
• Speed control
Recommended (Phoenix-25 amp)
• Servo extensions - 2 x 6” for rudder and
elevator, Y harness for ailerons
• Receiver - Feather, Micro
Recommended (4-6 channel FM)
• Motor and Receiver battery
Recommended (Li-poly, 3 cell, 11 .1 volt,
1200 – 1320ma)
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Tools:
• Modeling knife
• Electric drill and selection of bits
• Phillips screwdriver
• Flat head screwdriver
• Needle nose pliers
• Wire Cutters
• Punch
• Pins
• Ruler and tape measure
• Pen, pencil or felt tipped marker
• Flat building board
• Building squares and blocks
• Masking tape
• Clear tape (optional)
Adhesives:
• Thin CA
• CA kicker (optional)

SU-31 PROFILE
ELECTRIC ARF WING
ASSEMBLY
1. Lay a 36” ruler parallel to the trailing edge of the
wing.
2. Mark the center of the trailing edge. Then mark
the trailing edge of the wing 7/32” on both sides
of the centerline to show where the sides of the
fuse will be when the wing is centered in the
fuse.
3. Use a 90º square to mark the centerline of the
wing from the leading edge to the trailing edge
on the top and bottom of the wing. Servo cut
outs and open bays, are on the bottom side of
wing.
4. Use a T pin to punch several small holes through
the covering on the top and bottom of the wing in
a random pattern. The holes are to allow thin CA
to wick into the wood on the wing center section.
The holes should not extend more than 3/16”
either side of the centerline. Do not punch all the
way through the balsa wood.
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5. Use building squares, wood blocks, shims, and or
masking tape as necessary to accomplish the
following steps for aligning the wing to the fuse.
Insert the wing through the fuse. Block and tape
the fuse 90º vertical on the building board.
6. Ensure the trailing edge of the wing is 90º to the
fuse.
7. Ensure the fuse edge is aligned with the fuse
edge mark on the wing trailing edge on both left
and right sides.
8. Ensure the distance from the wing tip trailing
edge to the center of the fuse tail is equal for both
the left and right wings.
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9. Ensure the wing tips are equal distance from the
building board on both the left and right sides.
10. IMPORTANT: Check and recheck all
measurements to ensure the wing is straight,
level, and aligned square with the fuse. When
you are satisfied with the alignment, tacks glue
the wing to the fuse on the topside with thin CA
at the leading and trailing edges and center of the
fuse. Then remove the wing and fuse from the
table and flow thin CA all along the wing and
fuse joint on the left and right sides and on both
the top and bottom. Allow the CA to wick into
the holes that were punched in the wing covering.
Do not use so much CA that it runs out of the
joint and makes a mess on the wing or fuse.
The wing assembly is now complete.
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SU-31 PROFILE STAB
ASSEMBLY
11. Lay an 18” ruler parallel to the trailing edge of
the stab.
12. Mark the center of the trailing edge of the stab.
Then mark the trailing edge of the stab 7/32” on
both sides of the centerline to show where the
sides of the fuse will be when the stab is centered
in the fuse
13. Use a 90º square to mark the centerline of the
stab from the leading edge to the trailing edge on
the top and bottom of the stab.
14. Use a T pin to punch several small holes through
the covering on the top and bottom of the stab in
a random pattern. The holes are to allow thin CA
to wick into the wood on the stab center section.
The holes should not extend more than 3/16”
either side of the centerline. Do not punch all the
way through the balsa wood.
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15. Use building squares, wood blocks, shims, and or
masking tape as necessary to accomplish the
following steps for aligning the stab to the wing
and fuse. Insert the stab into the fuse. Ensure the
trailing edge of the stab is 90º to the fuse.
16. Ensure the distance from the wing tip trailing
edge to the tip of the stab trailing edge is equal
for both the left and right wings. Ensure the stab
is level to the wing when viewed from the front
and rear of the fuse.
17. IMPORTANT: Check and recheck all
measurements to ensure the stab is straight,
level, and aligned square with the wing and fuse.
When you are satisfied with the alignment, tack
glue the stab to the fuse on the topside with thin
CA at the leading and trailing edges. Then
remove the fuse from the table and flow thin CA
all along the stab and fuse joint on the left and
right sides on both the top and bottom. Allow the
CA to wick into the holes that were punched in
the stab covering. Do not use so much CA that it
runs out of the joint and makes a mess on the stab
or fuse.
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The stab assembly is now complete.

SU-31 PROFILE
ELECTRIC ARF
FLIGHT CONTROL
ASSEMBLY
18. Locate the 4 control horns and 11 CA hinges
pictured below.
19. Lay out both ailerons with the leading edges
facing toward you and root end to root end, as
they would be mounted on the wing. Mark the
bottom of each aileron leading edge 1 1/4” from
the root end. Make sure you make a left and right
aileron with the control horns on the bottom.
20. Center control horn over mark and in the center
of the balsa aileron doubler. Mark the location of
the two control horn mounting pins. Ensure the
control rod linkage holes in the top of the control
horn line up with the leading edge of the aileron.
The control rod linkage holes in top of control
horn should be centered on aileron hinge line.
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21. Use a 1/16” drill bit and drill the holes for the
control horn mounting pins. Back up the balsa
aileron with a wood block when drilling to avoid
pushing out the back of the covering material and
splitting the wood.

22. Press the control horn into the balsa all the way
down so that the base of the control horn is flush
against the aileron. Apply thin CA to the base of
the control horn to ensure a secure joint.
IMPORTANT: Be sure to make a LEFT and
RIGHT aileron by mounting the control horns on
the bottom of each aileron.
23. Use wire cutters to cut off the control horn
mounting pins flush with the top of the aileron.
24. Install aileron hinges by first inserting a pin
through the center of the hinge and then inserting
each hinge into the pre-cut slots in the trailing
edge of the wing as shown in the photo below.
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25. Insert the hinges into the precut slots in the
aileron. Ensure the aileron line up with the wing
tip and that the hinges are straight. Then press
the aileron against the pins. This ensures the
hinges are centered between the wing and
ailerons. Next remove the pins then press the
aileron tight against the trailing edge of the wing.

26. Place a drop of thin CA on the top and bottom of
each hinge. Be certain to allow for maximum
control throw deflection prior to gluing. Do not
use too much CA to avoid it running out on the
wing or aileron or in the hinge gap and gluing the
aileron to the wing. Attach the other aileron to
the wing the same way.
27. Mark the top left side of the elevator ½” out from
the fuse side.
28. Center control horn over the mark and in the
center of the balsa elevator doubler and mark the
location of the two control horn mounting pins.
Ensure the control rod linkage holes in the top of
the control horn line up with the leading edge of
the elevator. Use a 1/16” drill bit and drill the
holes for the control horn mounting pins. Back
up the balsa elevator with a wood block when
drilling to avoid pushing out the back of the
covering material and splitting the wood.
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29. Press the control horn into the balsa all the way
down so that the base of the control horn is flush
against the elevator. Apply thin CA to the base
of the control horn to ensure a secure joint.

30. Use wire cutters to cut off the control horn
mounting pins flush with the top of the elevator.
31. Install elevator hinges by first inserting a pin
through the center of the hinges and then
inserting each hinge into the pre cut slots in the
trailing edge of the stab. Next insert the hinges
into the precut slots in the elevator. Ensure the
elevator tips line up with the stab tips and that the
hinges are straight. Then press the elevator
against the pins. This ensures the hinges are
centered between the stab and elevator. Next
remove the pins then press the elevator tight
against the trailing edge of the stab.
32. Place a drop of thin CA on the top and bottom of
each hinge. Be certain to allow for maximum
control throw deflection prior to gluing. Do not
use too much CA to avoid it running out on the
stab or elevator or in the hinge gap and gluing the
elevator to the stab.
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33. Mark the rudder ½” up from the bottom on the
left side.

34. Center control horn over the mark and in the
center of the balsa rudder doubler and mark the
location of the two control horn mounting pins.
Ensure the control rod linkage holes in the top of
the control horn line up with the leading edge of
the aileron.
35. Use a 1/16” drill bit and drill the holes for the
control horn mounting pins. Back up the balsa
rudder with a wood block when drilling to avoid
pushing out the back of the covering material and
splitting the wood.
36. Press the control horn into the balsa all the way
down so that the base of the control horn is flush
against the rudder. Apply thin CA to the base of
the control horn to ensure a secure joint.
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37. Use wire cutters to cut off the control horn
mounting pins flush with the side of the rudder.

38. Install rudder hinges by first inserting a pin
through the center of the hinges and then
inserting each hinge into the precut slots in the
trailing edge of the fin. Next insert the hinges
into the precut slots in the rudder. Ensure the
rudder lines up with the bottom of the fuse, and
does not scrape or touch the top of the fin. Ensure
the hinges are straight, and then press the rudder
against the pins. This ensures the hinges are
centered between the fin and rudder. Next
remove the pins then press the rudder tight
against the trailing edge of the fin.
39. Place a drop of thin CA on the left and right of
each hinge. Be certain to allow for maximum
control throw deflection prior to gluing. Do not
use too much CA to avoid it running out on the
fin or rudder or in the hinge gap and gluing the
rudder to the fin.
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Flight control assembly is now complete.

SU-31 PROFILE
ELECTRIC ARF
WHEELS AND MOTOR
ASSEMBLY
40. Locate the wheel parts pictured below.
41. Note that the landing gear wires fit one on top of
the other.
42. Insert the longer landing gear wire into the upper
hole in the landing gear mounting plate. Insert
the shorter landing gear wire into the lower hole.
43. Install the two nylon wire ties through the pre-
drilled holes and around both landing gear wires.
Pull the wire ties snug.
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44. Cut off excess wire tie strap with wire cutters
flush with the wire tie head.
45. Install wheel spacer on the gear axles, followed
by the wheel, and secured with a wheel collar.
Tighten the wheel collar securely with a Phillips
head screwdriver. Landing gear is now
complete.
46. Assemble motor mount to the front of the motor.
Now center the motor in the motor cutout in the
nose of the fuse. Ensure the motor does not
touch the fuse. Mark the position for the motor
mount screw holes on the front of the fuse.
47. Use a 3/32” bit to drill the motor mount screw
pilot holes into the hard wood blocks in the front
of the fuse. Place a drop of thin CA into each
hole to harden.
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48. Install motor using two Phillips head self-tapping
screws.
Motor installation is now complete
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