AeroWorks 50cc EXTRA 260 ARF-QB User manual

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50cc EXTRA 300 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
Page
Aeroworks Contact Information ………………………………………………………………. 3
Introduction ……………………………………………………………………………………... 4
Kit Contents……………………………………………………………………………………… 5
Items Needed To Complete ……………………………………………………………………... 8
Tightening and Re-shrinking the Covering ………………………………………………….. 9
Ultracote™ Colors …………………………………………………………………………….. 10
Check Seams and Overlaps for Good Seal ……………………………………………………. 11
Checking Hinges For Proper Throw …………………………………………………………… 12
Wing Assembly………………………………………………………………….……………….. 13
Stab and Elevator Assembly……………………………………………………………………. 18
Rudder and Pull-Pull Cable Assembly ………………………………………………………… 22
Tail Wheel Installation ………………………………………………………………………….. 29
Main Landing Gear, Gear Cuffs, and Wheel Pants Assembly ……..………………………… 33
Engine Installation ……………………………..……………………………………………….. 38
Canister Installation………………………………………………………………….………….. 42
Tuned Pipe Installation………………………………………………………...….…………….. 46
Throttle/Choke Servo Installation……………………………………………………………… 50
Ignition Installation ……………………………………………………………………………... 55
Fuel Tank Assembly and Installation………………..…………………………………………. 58
Radio Installation ………………………………………………………………………………... 65
Cowl Installation ………………………………………………………………………………… 68
Preflight Preparation ……………………………………………………………………………. 73
Decal installation …………………………………………………………………………………. 76
Center of Gravity (C.G.) / Control Throws …………………………………………………….. 80
Control Throw Deflection Table ………………………………………………………………… 83

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4903 Nome Street
Denver, CO 80239
Phone: [phone]
Fax: [phone]
Website: www.aero-works.net
E-mail: [email protected]
Thank you for choosing the Aeroworks 50cc EXTRA 300 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 50cc EXTRA 300 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 50cc EXTRA 300 ARF-QB is a highly aerobatic airplane. It is capable of both pre-
cision and 3-D maneuvers. The aircraft builds easily, quickly, and precisely due to its state
of the art CAD design, LASER cut technology, and high quality included hardware. We hope
you enjoy building and flying your 50cc EXTRA 300 ARF-QB.
Great care has been taken in both the design and manufacturing of the 50cc EXTRA 300
ARF-QB to allow for the strongest and lightest construction possible. Only the highest qual-
ity materials from the covering, paint, wood and hardware have been used in the construction
of this model.
The 50cc EXTRA 300 ARF-QB has been individually hand built, covered and painted by
trained and experienced craftsmen with over 25 years of manufacturing experience. Using
CAD design, laser cut technology and jig-built assures accuracy in all stages of production.
The 50cc EXTRA 300 ARF-QB is designed for gas engines in the 50cc category. The De-
sert Aircraft 50cc engine is shown in the assembly instructions. The aircraft was tested with
the Desert Aircraft 50cc and has outstanding performance. The final choice of engine is left
up to the builder. A computer radio is recommended to allow the pilot to take advantage of
the full capabilities of this aerobatic aircraft.
IMPORTANT Please read through this manual carefully, before starting the assembly of
your new 50cc EXTRA 300 ARF-QB . Inventory and inspect all parts and hardware for any
imperfections or damage. Notify Aeroworks immediately if there are missing or dam-
aged parts. 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.
!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 Extra 300 ARF-QB
Materials List
Basic Aircraft Parts
Fuselage with pre-installed vertical fin – covered, fire
wall fuel-proofed, pre-drilled three holes for the
tail wheel assembly:
(4) 8-32 blind nuts installed for main landing gear
(18) 4-40 blind nuts installed for the mounting of the
stab(4),Cowling(2) and Belly Pan of fuse(12).
(1) Engine box top hatch cover with AW logo in
stalled by (4) T2.6x8mm PWA screws
(1) Engine box bottom hatch cover with AW logo
installed by (4) T2.6x8mm PWA screws
(1) Bottom Long Pipe Hatch installed by (6) 4-
40x14mm hex style bolts and (6) #6 bonded washers
(1) Bottom Canister Hatch installed by (6) 4-
40x14mm hex style bolts and (6) #6 bonded washers
(1)Hatch cover for the landing gear installed by (2)
T2.6x16mm PWA screws
Canopy base—painted, with (4) 4-40 blind nuts in-
stalled
(1) Tinted Canopy—glued on the canopy base and
painted, installed on the fuselage by (4) 4-40x16mm
hex style bolts
(4) #6 bonded washers for the mounting of the can-
opy
(4) 3mm split lock washers for the mounting of the
canopy
(1) 3.5(o.d.) x850mm Antenna tube installed
(2) 3.5(o.d.) x70mm pull-pull exit tube installed
(2) Elevator servo string installed
Left Wing with Aileron – covered: Pre-drilled for the
mounting of the control horns
(2)8-32 blind nuts installed for the wing mounting.
(2)located pins installed pre-drilled hole for cotter

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pin
(6) pin point hinges glued
(1) Aileron servo string installed
Right Wing with Aileron – covered: Pre-drilled for the
mounting of the control horns
(2) 8-32 blind nuts installed for the wing mounting.
(2)located pins glued pre-drilled hole for cotter pin
(6) pin point hinges installed
(1) Aileron servo string installed
Horizontal Stabilizer with elevator assembly with (8)
pin point hinges (glued)---covered
Elevators Pre-drilled for the mounting of the
control horns
Rudder with (5) pin point hinges (not glued) – covered
Rudder Pre-drilled for the mounting of the con-
trol horns
SUB ASSEMBLIES:
#1:
(1) Fiberglass Cowling w/ inside ring glued—painted
with (2) screws holes at bottom and (2) 6-32 blind nuts
installed at top
(2) 4-40x16mm hex style bolts for mounting cowling
(2) #6 bonded washers for mounting cowling
(2) 3mm split lock washers for mounting cowling.
(2) 6-32x16mm hex head bolts for mounting cowling
(2) #6 bonded washers for mounting cowling
#2:
(1) 4mm 7075Aluminum Main Landing Gear -- painted
(2) 5x40mm Axle Bolts
(2) M8 lock nuts
(4) 5mm i.d. Wheel Collars with set-screws
(2) 95mm Dia. Main Wheels (Lite Type)
(4) 4-40x14mm hex style bolts for mounting wheel
pants
(4) 3mm flat washer for mounting wheel pants
(4) 3mm split ring lock washer for mounting wheel
pants
(4) 8-32x20mm hex head bolts for mounting main land-
ing gear
(4) 4mm flat washers for mounting main landing gear
(4) 4mm split ring lock washers for mounting main
landing gear.
#3:
(2)Wheel Pants—1 Left and 1 Right---Painted
(4) 4-40 blind nuts installed on the wheel pants, 2 per
side.
#4:
(2) Gear Cuffs – 1 Left and 1 Right - Painted
(4) 4-40x7mm hex style head bolts for cuffs mounting
(4) #6 bonded washers for cuffs mounting
#5:
(1) AW Aluminum Tail Wheel Assembly – Medium
#6:
(1) 32mm o.d. Aluminum Tube for wing joint—
Anodized Black
(2) 12.5mm o.d. Aluminum Tube for stab joint – one
front and one rear, Anodized Black
(4) 8-32x25mm Hex head bots for wing mounting
(4) #8 bonded washer for wing mounting
(4) 4mm split ring lock washers for wing mounting
(4) 4-40x16mm Hex style head bolts for stab mounting
(4) #6 bonded washer for stab mounting
(4) 3mm split ring lock washers for stab mounting
(4) 1.8mm cotter pins
#7:
(2) 4-40 3” Left hand and Right hand threaded pushrods
with nuts for ailerons
(2) 4-40 2-1/2” Left hand and Right hand threaded push-
rods with nuts for elevators
(1) Wrench for the left hand and right threaded pushrod
(2) 4-40x300mm Threaded pushrods
(2) 4-40 solder coupler with nuts
(2) 4-40 Metal clevises
(6) brass spacers – 2 for ailerons; 2 for elevators; 1 for
throttle; 1 for choke
(10) 4-40 Ball Link – 4 for ailerons; 4 for elevators; 1
for throttle; 1 for choke
(10) 4-40x16mm hex style bolts
(10) 4-40 lock nuts
(10) 3mm flat washers
#8:
(2) 1x1100mm plastic coated pull-pull steel cable.
(4) 4-40 Metal R/C links with metal clevises and nuts
(4) 3.5x5mm brass pull-pull swaging tubes
(6) AW double control horns
(24) T2.6x16mm Phillips head mounting screws
(12) T2.6x12mm Phillips head mounting screws
(4) 4-40 Ball Links for rudder servo
(4) 4-40x16mm hex style head bolts
(4) 4-40 Lock nuts
(2) Brass Spacers
(4) 3 flat washers
#9:
(1)750cc Gas Fuel Tank Assembly –Gas
(1) 450cc Gas Fuel Tank Assembly-Smoke
(1) 4ft. large gas fuel line
(4) Brass Barbs for fuel line
(2) Fuel filler Dot – 1 male and 1 female
#10:
(2)Throttle servo mounting trays
(1) Canister mounting bracket with Silicon Tubes
(1) Long Pipe mounting bracket with Silicon Tubes
(3) Engine Mount Temp (DA50, 3W50 & Universal)
(2) 8x8x300mm Sponge for the receiver and battery

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(2) 6x70x160mm Foam for the Fuel Tanks
(6) 8x450mm Nylon Ties for the fuel tank mounting
(10) 3x150mm Small Nylon Ties for the fuel line
(4) 356x12.5mm Velcro
(1) Card Stock (8”x11”) for making the template for
cutting of cowling
(1) Pre-cut (hot air exit) Template for cutting out the
bottom of the cowl
(1) Paper Degree Meter for the Rudder
(1) 12mm Aluminum Insert
(6) Rubber Grommets – each for 6mm, 8mm 10mm –
Fuel line and wire guide
#11:
(24) 6.35mm Aluminum Engine Stand offs.
#12:
(1) 300x300mm White Covering
(1) 300x300mm Cub Yellow Covering
(1) 300x300mm Pearl Blue Covering
OR (1) 300x300mm White Covering
(1) 300x300 True Red Covering
(1) 300x300 Black Covering
(1) 20x1800mm transparent covering
#13:
(1) Custom throw meter
#14:
(1) Manual CD
#15:
(1) Vinyl Decal Set

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Hardware:
ITEMS NEEDED TO COMPLETE
• 50cc Gas engine and ignition
• Standard or Pitts style muffler (Pitts Recommended)
• Engine mount, mounting bolts, lock nuts, and
flat washers.
• 3.5” Spinner and propeller of choice
• 2 x aileron servos (min 180 in./oz. Torque @ 6
volt, Digital, Metal Geared)
• 1 x rudder servo (min 180 in./oz. Torque @ 6
volt, Digital, Metal Geared)
• 2 x elevator servos (min 180 in./oz. Torque @ 6
volt, Digital, Metal Geared)
• 1 x throttle servo (Fast / Reliable)
• 1 x choke servo (Fast / Reliable) optional
• Servo extensions 4 x 6,” 1 x 12”, 2 x 24”
• 1 x 6 channel receiver (PCM recommended)
• 1 x receiver battery (min 6.0 volt / 1700ma)
• 1 x ignition battery (min 4.8 volt / 1700ma)
• 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 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 heat gun with extreme caution. Take
care not to apply too much heat to one area for
long periods of time. This may cause the trim
colors to over shrink and pull away leaving un-
sightly gaps on the color lines. The trim stripes
are especially vulnerable to over shrinking.

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1. Your model is covered with Ultracote™ covering.
In case of repairs, the colors are:
Yellow/Silver/Blue Scheme
Pearl Blue #845
Silver #881
Cub Yellow #884
White #870
Ultracote™ Colors
2. Red/White/Black Scheme
Black #866
Silver #881
True Red #866
White #870

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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. This is an optional step but is recommended.
Cut strips of clear covering to fit the hinge
gaps. Use covering iron to seal the clear
covering snugly into the bottom of the
hinge lines as shown for air tight hinge
seals.
Note: Remove clear pro-
tective backing
from film.
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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CHECKING HINGES FOR PROPER THROW
2. Evenly heat each hinge along the entire length of
the wing. This will allow the hinge glue to soften
and the hinge to move into it proper position.
Hold the surface at full deflection until the
hinges have cooled down and the glue has re-
hardened.
3. If the elevator hinges are tight follow the
same process as described for the wings.
Note: Once these steps have been completed
the hinges will throw to their full deflect-
tion.
IMPORTANT
1. If control surfaces will not throw to full deflec-
tion it may be necessary using a heat gun to
apply heat to the knuckle of each hinge. This
will allow the hinges to move freely.

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Aileron Servo Installation
1. The ailerons have been pre-hinged and glued to
the wing panels and are ready for flight. No
other steps are necessary for hinging.
Gather (1) wing panel, (1) aileron servo, (4) servo
mounting screws, (1) 1 1/4” servo arm , (1) safety
clip and (1) 6” servo extension as shown below
for preparation of the servo installation.
WINGASSEMBLY
2. Layout the servo on the wing to test fit the in-
stallation and ensure servo lead is the correct
length.
Note: 180 in. oz. digital, metal geared servos are
recommended. Servo selection can be the difference
between a great flying model and a model that will
crash. Always use brand name high quality servos.
3. Attach the 6” extension to the servo lead and
secure with Aeroworks Safety Clip. Ensure the
connectors will not come apart from vibration or
light tension.
4. Fasten the pull string from the servo hole to the
male plug of the servo extension.
Safety Clips
Available
from
Aeroworks

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5. Draw the servo extension through the wing and
pull through the wing root rib.
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
6. Install servo in servo well with the output arm
toward the leading edge of the wing. Mark and
drill location of servo mounting holes.
7. Install servo with servo mounting screws.
Pushrod / Control Horn Installation
1. Gather the aileron control linkage parts as shown
below. (1) 3” pushrod, (2) 4-40 ball link assem-
blies, (1) brass spacer, (1) flat washer, (1) left
and (1) right side control horn, and (6) wood
screws for each wing panel.
Wing
LeadingEdge

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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
3. Correct installation of ball link to servo arm
shown below.
Note: Flat washer will prevent ball link from
coming loose from brass ball.
4. Place the control horns over the predrilled
mounting holes.
5. Use a drop of thick CA glue on each screw to
prevent screws from loosening due to vibration
as shown.
Pushrods have both left and right hand threads.
This allows for easier fine adjustments during final
setup. Be sure to thread ball link correctly onto
pushrod. Ball links are self taping and can be used
on either ends of the pushrod. Once ball link has
been threaded only rethread it onto the same direc-
tion threads.

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6. Securely fasten the control horn to the aileron
with six wood screws.
7. Plug servo and battery into the receiver and turn
radio on. Ensure the servo trim and sub trim is
centered. Adjust the length of the pushrod so
that the servo arm is parallel to the aileron hinge
line and the trailing edge of the aileron is even
with the trailing edge of the wing in the neutral
position.
Note: Control horns have been set at a slight offset
to provide full power at full deflection.
9. Use the opposite end of the adjustment wrench
to tighten the pushrod jam nuts against the ball
links. This will prevent the pushrod from turning
in flight.
8. Use the supplied adjustment wrench to adjust the
pushrod as shown below.

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10. Ensure the servo does not bind at either end
point at full deflection. A 1” servo arm is rec-
ommended for best results. A 1 1/4” servo arm
is required for full deflection of the aileron
bevel.
11. Repeat all the above steps for the other wing.

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Elevator Servo Installation
1. The elevators have been pre-hinged and glued to
the stabs and are ready for flight. No other steps
are necessary for hinging. Clear covering has
been provided for sealing of the hinge gaps if
desired.
Gather the stab/elevator assembly, (2) ele-
vator servos, and (2) 24” servo extension.
Note: 24” servo extension will be used to
connect servos to receiver during a later
step.
STAB AND ELEVATOR ASSEMBLY
2. Install servo in servo well with the output shaft
toward the leading edge of the stab. Fish the
servo lead through the stab and out of the stab
root rib.
3. Mark locations of servo mounting holes. Use a
1/16 bit to drill servo mounting holes.
4. Install servo with servo mounting screws.
1. Gather the elevator control linkage parts as
shown below. There are:
• (2) 4-40 pushrods 2 1/2”
• (4) 4-40 ball link assemblies
• (2) Flat washers
• (2) brass spacer
• (2) left side control horns
• (2) right side control horns
• (1) Adjustment wrench
• (12) wood screws
Elevator Control Linkage Installation

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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
3. Correct installation of ball link to servo arm
shown below.
Note: Flat washer will prevent ball link from
coming loose from brass ball.
Pushrods have both left and right hand threads. This
allows for easier fine adjustments during final setup.
Be sure to thread ball link correctly onto pushrod.
Ball links are self taping and can be used on either
ends of the pushrod. Once ball link has been
threaded only rethread it onto the same direction
threads.
4-40
BOLT FLAT
WASHER
LOCK NUT
BRASS
SPACER
4. Place the control horns over the predrilled
mounting holes.
Note: Control horns have been set at a slight
offset to allow for maximum torque at full
deflection
5. Use a drop of thick CA glue on each screw to
prevent screws from loosening due to vibration
as shown.
Note: CA glues have a fast drying time.
Remember to work quickly.

20
6. Mount the control horn using six wood screws.
7. Plug servo and battery into the receiver and turn
radio on. Ensure the servo trim and sub trim is
centered. Adjust the length of the pushrod so
that the servo arm is parallel to the elevator
hinge line and the counter balance of the eleva-
tor is even with the leading edge of the stab in
the neutral position.
8. Use the supplied adjustment wrench to adjust the
pushrod as shown below.
9. Use the opposite end of the adjustment wrench
to tighten the pushrod jam nuts against the ball
links. This will prevent the pushrod from turning
in flight.