AeroWorks Sport Cub S2 ARF-QB User manual

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50cc Sport Cub S2 ARF-QB
(Quick Build)
ASSEMBLY MANUAL
AEROWORKS
4903 Nome Street, Denver, CO. 80239 - Phone [phone] - Fax [phone]
E-mail - [email protected]

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TABLE OF CONTENTS
1
Page
Aeroworks Contact Information ………………………………………………………………. 3
Introduction ……………………………………………………………………………………... 4
Kit Contents……………………………………………………………………………………… 5
Items Needed To Complete ……………………………………………………………………... 8
Removing Cockpit Hatch & Instrument Panel ………………………….…………………….. 9
Tightening and Re-shrinking the Covering …………………………………………………… 10
Check Seams and Overlaps for Good Seal ……………………………………………………. 11
Ultracote™ Colors …………………………………………………………………………….. 12
Wing Assembly………………………………………………………………….……………….. 13
Rudder and Pull-Pull Cable Assembly ………………………………………………………. 21
Stab and Elevator Assembly…………..…...………………………….………………………… 29
Flying Wire Installation …………...…………………………………………………………….. 35
Main Landing Gear Installation ……………………………………………………………….. 38
Optional “Tundra” Tire Assembly ……………..….…..…………………………….………… 43
Tail Wheel Assembly ………………..………....……………………………………………….. 44
Engine Installation ………………………..…....……………………………………………….. 47
Throttle/Choke Installation ……...…………………………………………………………….... 50
Ignition Installation ……..…………..……..……………..…………………………………….. 56
Fuel Tank Assembly and Installation………………..…………………………………………. 59
Pitts Muffler Installation ……………………………………………………………………... 65
Canister Installation ……………………………………………………………………………... 66
Cowl Installation …………………………………………………………….…………………… 70
Radio Installation……………………………….…………………………………………….….. 75
Decal Installation ………………………………………………………………………………… 76
Preflight Preparation ……………………………………………………………………………. 79
Center of Gravity (C.G. Buddy) …………………...…………………………………………….. 81
Control Throws …………………………………………………………………………………… 83
Control Throw Deflection Table ………………………………………………………………… 84

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4903 Nome Street
Denver, CO 80239
Phone: [phone]
Fax: [phone]
Website: www.aero-works.net
E-mail: [email protected]
Tech Support: [email protected]
Thank you for choosing the Aeroworks Sport Cub S2 ARF-QB. We put great effort into
making this plane the best model you will ever build and fly. We have provided you
with the highest quality kit and performance possible. We wish you great success in the
assembly and flying of your new Aeroworks Sport Cub S2 ARF-QB.
!WARNING!
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 manufacturer instructions included with your plane, radio,
servo’s, batteries and engine.
Aeroworks manufacturing warranties this kit to be free from defects in both material
and workmanship at the date of purchase. This warranty does not cover any component
parts damaged by use or modification. In no case shall Aeroworks liability exceed the
original cost of the purchased kit. Further, Aeroworks reserves the right to change or
modify this warranty without notice.
In that Aeroworks has no control over the final assembly or materials used for final as-
sembly, No liability shall be assumed nor accepted for any damage resulting from the
use by the user of the final user-assembled product. By the act of using the user-
assembled product, the user accepts all resulting liability.
We, as the kit manufacturer, have provided you with a top quality, thoroughly tested kit
and instructions, but ultimately the quality and fly ability of your finished model de-
pends on how you build it; therefore, we cannot in any way guarantee the performance
of your completed model, and no representations are expresses or implied as to the per-
formance or safety of your completed model.

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INTRODUCTION
Your new Sport Cub S2 ARF-QB is a scale airplane. The aircraft builds easily, quickly, and
precisely due to its state of the art CAD design, LASER cut technology, and high quality in-
cluded hardware. We hope you enjoy building and flying your Sport Cub S2 ARF-QB.
Great care has been taken in both the design and manufacturing of the Sport Cub S2 ARF-
QB to allow for the strongest and lightest construction possible. Only the highest quality ma-
terials from the covering, paint, wood and hardware have been used in the construction of
this model.
The Sport Cub S2 ARF-QB has been individually hand built, covered and painted by trained
and experienced craftsmen with over 25 years of manufacturing experience. Using CAD de-
sign, laser cut technology and jig-built assures accuracy in all stages of production.
The Sport Cub S2 ARF-QB is designed for gas engines in the 50cc gas category. DA 50cc
engine is shown in the assembly instructions. The aircraft was tested with the DA 50 and
has outstanding performance. The final choice of engine is left up to the builder. A com-
puter radio is recommended to allow the pilot to take advantage of the full capabilities of this
aircraft.
IMPORTANT Please read through this manual carefully, before starting the assembly of
your new Sport Cub S2 ARF-QB . Inventory and inspect all parts and hardware for any im-
perfections or damage. Notify Aeroworks immediately if there are missing or damaged
parts. INTENDED USE
This plane should not be regarded as a toy. This is an intermediate to advanced skill level model and
is recommended for pilots who are beyond the trainer-stage.
!READ! WARRANTY !READ!
It is important to notify Aeroworks of any damage or problems with the model within 30
days of receiving your airplane to be covered under warranty. All returned parts must be
shipped in their original shipping boxes and insured for full replacement value. If you wish to
return this aircraft for any reason a 15% restock fee will be charged to the customer. In addi-
tion the customer is responsible for all return shipping cost and all prior shipping cost will
not be refunded. Parts will be fixed or replaced once the original item is returned at the
owner’s expense. It is the decision of Aeroworks if the item is to be replaced or repaired.
Aeroworks cannot insure the skill of the modeler and can not influence the builder during the
construction or use of this aircraft, and therefore, will not be accountable for any property
damage, bodily injury or death caused by this aircraft.
Aeroworks cannot insure the skill of the modeler and can not influence the builder during the
construction or use of this aircraft, and therefore,
The purchaser/operator accepts all responsibility of any and all structural or
mechanical failures.

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KIT CONTENTS
50cc Sport Cub S2ARF-QB
Materials List
Basic Aircraft Parts
Fuselage with pre-installed vertical fin -
Covered with Oracover, pre-drilled three holes for tail
wheel assembly:
(12) 4-40 blind nuts pre-installed (4) for cowling
mounting and (8) for tunnel hatch on
the bottom of fuse
(12) 6-32 blind nuts pre-installed (8) for landing
gear mounting and (4) for stab mounting
(2) Tunnel Hatches covered and pre-installed
with
(8) 4-40x12mm button head bolts and (8) 3mm
flat washers
(2) Fuse Rear Side Window, tinted color,
preglued
(2) Fuse Front Side Window (functional),
tinted color, pre-installed with the below
items:
(4) Nylon Hinges (2 each side);
(8) M2x8mm bolts;
(8) M2 hex nuts
(4) Nylon latch
(1) Door at the right of fuse, covered,
preinstalled
(1) Dash Panel – painted and pre-glued
(1) Front Windshield- vacuumed and
painted, pre-installed with
(18) T2x6mm screws
(2) 3.5(o.d.)x100mm pull-pull exit tube
Installed
Left Wing with Aileron, Flap – Covered, pre-drilled
for the mounting of the control horns

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(2) 8-32 blind nuts pre-installed for wing
mounting
(2) 6-32 blind nuts pre-installed for wing
struts mounting
(5) Large Pin Point Hinges glued for
Flap
(6) Large Pin Point Hinges glued for
Aileron
(1) Window Latch – pre installed
(2) Anti-rotation Pins installed
(1) Aileron servo string installed
(1) Flap servo string installed
Right Wing with Aileron, Flap – Covered, pre-
drilled for the mounting of the control horns
(2) 8-32 blind nuts pre-installed for wing
mounting
(2) 6-32 blind nuts pre-installed for wing
struts mounting
(5) Large Pin Point Hinges glued for
Flap
(6) Large Pin Point Hinges glued for
Aileron
(1) Window Latch – pre installed
(2) Anti-rotation Pins installed
(1) Aileron servo string installed
(1) Flap servo string installed
Horizontal Stabilizer with elevators with (8) pin
point hinges (glued)-covered Pre-drilled for the
mounting of the control horns
Rudder with (4) pin point hinges (not glued) - Cov-
ered Pre-drilled for the mounting of the control horns
# 1
(1) Cowl, fiberglass & factory painted
and trimmed, pre-drilled and
preinstalled grommets
(4) 4-40x16mm hex bolts with rubber O
ring for cowling mounting
# 2
(2) Main landing gear, 1 left, 1 right –
painted
(2) Shock Absorber assemblies
(1) Landing gear supports
(4) Metal fittings for landing gear, 2 front,
2 rear
(8) 6-32x20mm hex head bolts for
landing gear mounting
(8) 6-32x15mm hex head bolts for
landing gear mounting
(2) 6-32x10mm hex head bolts for
landing gear mounting
(10) 6-32 Lock Nuts for landing gear
mounting
(8) 3.5mm flat washers
(2) Nylon Spacers
(4) Cooper Spacers
(2) 4.25” Rubber Cub S2 wheels with
aluminum hub
(2) Hub caps - painted
(6) M2x5mm Phillip head bolts for caps
mounting
(4) 5mm i.d.x5mm Wheel Collars with 6-
32 set-screws
(2) 5mm i.d. x2mm plastic spacers
# 3
(1) Tail Wheel Assembly, assembled
(1) 50mm dia. rubber tail wheel with
aluminum hub
(1) Metal Rudder T-horn
(2) Coil Steering Springs
(3) T2.6x20mm PWA screws for tail
wheel mounting
(2) T2.6x15mm PWA screws for T arm
mounting
#4
(2) 4-40x3” left hand and right hand
threaded pushrods with nuts for
ailerons
(2) 4-40x3” left hand and right hand
threaded pushrods with nuts for
flaps
(2) 4-40x4-3/4” left hand and right hand
threaded pushrods with nuts for
elevators
(1) Wrench for the left hand and right
hand threaded pushrod
(12) 4-40 Ball Links – 4 for ailerons,4 for
flaps and 4 for elevators
(12) 4-40x16mm hex head bolts
(12) 3mm flat washers
(6) Brass Spacers
(12) 4-40 Lock Nuts
(12) Metal Control Horns – 6 left and 6
right
(36) T2.6x12mm Phillips head screws
for control horns mounting
# 5
(2) 1x1150mm Pull-Pull plastic coated
steel Cable
(4) 3.5x5mm brass swage tubes
(4) 4-40 Ball Links
(4) 4-40x16mm hex head bolts
(4) 4-40 lock nuts
(4) 3mm flat washers
(2) Brass Spacers
(4) 4-40 coupler with nuts for steel cable
(4) AL Metal Control Horns – 2 left and
2 right
(6) T2.6x12mm Phillip head bolts
(6) M2 hex nuts

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# 6
(2) 4-40x300mm threaded pushrods
(2) 4-40 Solder threaded coupler with
nuts
(4) 4-40 Ball Links
(4) 4-40x16mm hex head bolts
(4) 4-40 lock nuts
(4) Brass spacers
(4) 3mm flat washers
(2) Throttle Servo Tray
# 7
(1) 750cc Gas Fuel Tank with Rubber
Stopper
(2) Brass Barbs for fuel line
(2) Fuel Filler Dots – 1 male and 1
female
# 8
(2) Pre Assembled Wing Struts
(4) 6-32x20mm hex head bolts
(4) 6-32x12mm hex head bolts
(8) 6-32 lock nuts
(4) Pins
(1) L hex wrench
(1) Wrench (Fits 6-32 / 8-32)
(2) Foam Pads for protecting wing
# 9
(1) 32dia. x780mm aluminum wing
joiner – black anodized
(4) 8-32x25mm hex head bolts for
wing mounting
(4) #8 bonded washers
# 10
(4) L steel connectors for stab
mounting
(2) 6-32x10mm hex head bolts
mounting connector with Rear of
fuselage
(4) 6-32x15mm hex head bolts
mounting connector with Front of
fuselage and Front of stab
(2) 6-32x20mm hex head bolts
mounting connector with Rear of
stab
(4) 6-32 lock nuts mounting
connector with stab
(4) 8x3.2mm flat washers
(1) 5x191mm carbon stab tube
# 11
(4) Tail Flying Wires – pre-made
(3) M2x25mm Phillip head bolts
(3) M2 hex nuts
(2) T2.6x16mm PWA screws
# 12
(1) 3/4” thick Hardwood Spacer Block for
mounting engine DA50/DLE55
(1) Engine mounting template for DA 50/
DLE55
(1) Universal Engine Mounting Template
(1) 8x11” Card Stock Material for the
template for cutting of cowling
(1) 6x160x70mm foam for fuel tank
(2) 8x80x300mm Sponge for receiver and
battery
(4) 356x12.5mm Velcro
(6) 8x450mm Nylon Ties for fuel tank
mounting
(10) 3x150mm Nylon Ties for the fuel line
(1) 12mm aluminum insert
(6) Rubber Grommets – 2 each - size
6,8,10 for fuel line and wire guide
(1) Small Paper Degree Meter for the
rudder
# 13
(1) Customer Throw Meter
# 14
(1) C.G. Buddy
# 15
(24) 6.35mm Aluminum Engine Stand
offs
# 16
(1) 300x300mm Cub Yellow (#884)
Ultracote™ covering
OR
(1) 300x300mm White (#870)
Ultracote™ covering
(1) 300x300mm True Red (#866)
Ultracote™ covering
# 17
(1) Manual CD
# 18
(1) Decal Sheet

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Hardware:
ITEMS NEEDED TO COMPLETE
• 50cc Gas engine and ignition
• J-Tec 50cc Wrap Around Slim Fit Muffler
• 2 x aileron servos (min 172 in./oz. Torque @ 6
volt, Digital, Metal Geared)
• 2 x flap servos (min 172 in./oz. Torque @ 6 volt,
Digital, Metal Geared)
• 1 x rudder servo (min 172 in./oz. Torque @ 6
volt, Digital, Metal Geared)
• 2 x elevator servos (min 172 in./oz. Torque @ 6
volt, Digital, Metal Geared)
• 1 x throttle servo (Fast / Reliable)
• Servo extensions 2 x 6”, 4 x 18,” 2 x 24”
• 1 x 8 channel receiver (2.4Ghz recommended)
• 1 x receiver battery (7.4 volt/ 5200mah)
• 1 x ignition battery (7.4 volt/ 2600mah)
• 2 x voltage regulator
• 2 x switches with charge jacks
Tools:
• Allen wrenches US and Metric.
• Dremel cutting disc and sanding drum tool
• Electric drill and selection of bits
• Razor saw
• Flat head screwdriver
• Hobby heat gun
• Hobby iron and covering sock
• Masking tape
• Modeling knife
• Needle nose pliers or crimping tool
• Paper towels
• Pen, pencil or felt tipped marker
• Phillips screwdriver
• Rubbing alcohol
• Ruler and tape measure
• Scissors
• T pins
• Waxed paper
• Wire Cutters
Adhesives:
• 15-30 Minute epoxy
• Blue Loctite
• Epoxy mixing cups, mixing sticks, brushes
• CA kicker (optional)
• Thick, Thin and Medium CA
• Rubbing alcohol
• Wipes
WARNING
Some rubbing alcohols
may attack painted parts.

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1. Open your kit slowly and take care not to dam-
age any parts of the kit. Remove all parts from
their plastic protective covers for inspection.
Before doing any assembly it is recommended
that the canopy, and instrument panel be re-
moved. This will aid in assembling the model.
These items will be reinstalled when the rest of
the model is finished. Using a Phillips screw
driver remove the canopy from the fuselage as
shown below.
.
Removing Cockpit Hatch and Instrument Panel
2. Use a Phillips screw driver to remove the mount-
ing screws holding the instrument panel in place.
3. DO NOT use a heat gun near the side windows.
Heat applied directly to these surfaces will cause
the material to deform and bubble.

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1. Before doing any assembly or installation of any
decals it is very important to re-shrink or re-
tighten the already applied covering. Due to the
shipping process, heat and humidity changes
from different climates, the covering may be-
come lose and wrinkle in the sun. If you take the
time to re-tighten the covering, you will be re-
warded with a long lasting beautifully covered
model.
TIGHTENINGAND RE-SHRINKING THE COVERING
2. Using your covering iron with a soft sock, gently
apply pressure and rub in the covering. If any
bubbles occur, your iron may be to hot. Reduce
heat and work slowly.
3. If bubbles persist, use a small pin to punch
holes in the bubble to relieve trapped air and
reheat.
4. Use your covering iron to ensure all edges,
seams, and color overlaps are securely sealed.

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1. Go over all seams and color overlaps with your
sealing iron.
Note: Even if your models covering has no wrin-
kles out of the box it is still very important to go
over all seams and overlaps to make certain they are
sealed securely. This is especially important at the
leading edges of the wings and stabs. We recom-
mend checking the covering after each flying ses-
sion.
CHECKING SEAMS AND COLOR OVERLAPS FOR GOOD SEAL
2. Use your covering iron to ensure all edges,
seams, and color overlaps are securely sealed.
3. Go over all hinge gaps and seal all seams.
IMPORTANT:
It is the responsibility of the purchaser /
operator to check the covering seams and
overlaps for security and a good seal.
Aeroworks is not responsible for failure of
covering seams or overlaps during flight.
Note: If covering continues to lift apply a small
amount of thin CA underneath the covering.
Then using a clean rag apply pressure to secure.
One of the most important tools in your
flight box is a roll of clear tape. This can be
used at the field for fast and easy repairs of
the covering. Then once you have finished
flying the covering can be permanently
repaired.

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1. Your model is covered with Ultracote™ covering.
In case of repairs, the colors are:
Red/White Scheme
True Red #866
Black #874
White #870
Ultracote™ Colors
2. Yellow/Black Scheme
Cub Yellow #884
Black #874

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Aileron/Flap Servo Installation
1. The ailerons/flaps have been pre-hinged and
glued to the wing panels and are ready for flight.
No other steps are necessary for hinging.
Gather the following items:
◊ 1 - Wing panel
◊ 1 - Aileron servo
◊ 1 - Flap Servo
◊ 8 - Servo mounting screws
◊ 2 - 1 1/4” servo arm
◊ 1 - Safety clip
◊ 1 - 18” Servo Extension
WINGASSEMBLY
2. Layout the servos as shown below. Install the
extensions at this time and double check exten-
sion length.
3. Attach the 18” extension to the servo lead and
secure with Aeroworks Safety Clip. Ensure the
connectors will not come apart from vibration or
light tension. Safety clips available from
Aeroworks.
4. Fasten the pull string from the servo hole to the
male plug of the servo extension.

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5. Pull aileron extension through root end of wing.
6. Pull flap extension through root end of wing.
Note: Taping servo lead to the inside of the wing
panel will help to prevent lead from dropping
back inside of wing panel during
transportation.
7. Install servo in servo well with the output arm
toward the leading edge of the wing. Drill holes
for servo mounting screws.
8. Install servo with servo mounting screws. Re-
peat servo installation process for all aileron and
flap servos.

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9. Finished panel shown with servos installed.
Aileron/Flap Control Linkage
Installation
1. Gather the aileron and flap control linkage parts
as shown below.
◊ 1 - 3” pushrod - Aileron
◊ 1 - 3” Pushrod - Flap
◊ 4 - 4-40 ball link assemblies
◊ 2 - Brass spacers
◊ 4 - Flat washer
◊ 2 - Left control horns
◊ 2 - Right control horns
◊ 12 - Wood screws for each wing panel
3. Correct installation of ball link to servo arm
shown below.
Note: Flat washer will prevent ball link from
coming loose from brass ball.
2. Assemble the pushrod and control horn assem-
bly as shown. The ball link goes between the
left and right sides of the control horn sides and
is secured with a nylon lock nut. Start with the
center hole in the control horn. The ball link
may be moved up or down for more or less con-
trol throw. Brass spacer goes between servo arm
and ball link.
Note: Flat washer prevents ball link from
coming off brass ball.

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5. Use thick CA on each screw prior to installing to
lock screws in place.
Note: CA glues have a fast drying time.
Remember to work quickly.
6. Align the left and right sides of the control horns
to the mounting holes and mount using six wood
screws as shown.
7. Use tape to hold aileron in the neutral position.
Plug the servo into the receiver and turn radio
on. Ensure the servo trim and sub trim is cen-
tered. Adjust the length of the pushrod so that
the servo arm is parallel to the aileron hinge line
when it is placed on the servo output shaft.
Screw servo arm on the servo output shaft.
Note: On metal geared servos use Loctite for all
Servo arm mounting screws.
4. Align the control horns over the factory drilled
holes.

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Strut assembly and Installation
1. Gather the following items for the strut installa-
tion as shown below.
◊ 2 - strut mounts
◊ 2 - 6-32 mounting bolts
◊ 2 - strut eyelets
2. Use the 6-32 mounting bolt to install the strut
mount as shown. Use blue loctite to prevent the
mounting bolt from coming loose in flight.
3. Bolt the remaining strut mount in place as
shown.
4. Finished strut mount installation shown below.
Ensure that the mounts face the wing root as
shown.
Wing
Root

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5. Apply a small drop of medium CA to the strut
eyelet as shown. Screw the eyelet into the pre-
drilled hole in the bottom of the wing.
Note: CA glues have a fast drying time.
Remember to work quickly.
7. Finished strut mount and eyelet assembly shown
below. Repeat the same steps for the remaining
wing before continuing.
8. Gather the following items for mounting of the
struts to the wings:
◊ 2 - Struts
◊ 8 - 6-32 mounting bolts
◊ 8 - 6-32 lock nuts
◊ 4 - Set pins
◊ 4 - Cotter pins
◊ 1 - Pushrod adjustment wrench
◊ 1 - Custom allen wrench
◊ 2 - Foam transportation pads
6. Install the remaining eyelet in the wing as
shown.

19
9. The foam transportation pad can slip over the
two eyelets and kept in place using the set pins
and cotter pins. This will prevent the struts from
damaging the wing during transport.
11. Be careful not to over tighten the bolts as this
will keep the struts from pivoting into place.
12. Secure the center strut support using the set pins
and cotter pins.
10. Use the 6-32 mounting bolts and lock nuts to
secure the struts to the strut mounts as shown.

20
13. Cotter pin installation shown below.
15. Finished strut assembly shown. Remove the bot-
tom set pins to fully collapse the strut as shown
below.
14. The remaining 6-32 bolts will be used to mount
the struts to the fuse. It is recommended that
these stay in the struts during transport to insure
they will not be misplaced.