Twisted Hobbys YAK User manual

Rev: 2014.11.04.v002a 1
MOTOR: 1x 18-20g/1750-1800kv Outrunner
ESC: 1x 10-12 amp
SERVOS: 2x 4-5g / 1x 8-9g
PROP: 1x 8x4.3
BATTERY: 2s 360mAh LiPo
USA Distributor
Twisted Hobbys
www.twistedhobbys.com
RADIO: min. 4 channel
WINGSPAN: 32 inches
LENGTH: 31 inches
AUW: 160 to 190 grams
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Rev: 2014.11.04.v002a 2
TABLE OF CONTENTS
TABLE OF CONTENTSTABLE OF CONTENTS
TABLE OF CONTENTS
Page
WARNING INFORMATION ....................................................................................................................................................... 3
SHIPPING DAMAGE.................................................................................................................................................................... 3
OUR MISSION............................................................................................................................................................................... 3
SAFETY NOTES............................................................................................................................................................................ 4
IMPORTANT: PRIOR TO ANY ASSEMBLY................................................................................................................... 4
KIT CONTENTS............................................................................................................................................................................ 5
TOOLS & ADHESIVES NEEDED .............................................................................................................................................. 6
THE BUILD.................................................................................................................................................................................... 7
CENTER OF GRAVITY ............................................................................................................................................................. 28
CONTROL THROWS................................................................................................................................................................. 28
PRE-FLIGHT & TESTING ........................................................................................................................................................ 29
P REFLIGHT C HECKS 29
Motor 29
Flight Controls 29
Batteries 29
Radio 29
Range Check 29
F LIGHT T ESTING 29
S TORAGE 29
OPTIONAL PARTS..................................................................................................................................................................... 30
NOTES & S/U SHEET................................................................................................................................................................. 31
TIPS AND TRICKS ..................................................................................................................................................................... 32

Rev: 2014.11.04.v002a 3
TWISTED HOBBYS
Website: www.twistedhobbys.com – email: [e-mail]
Thank you for your purchasing a Twisted Hobbys’ model. Please read through the entire manual before beginning to
build this model. If you have any questions please contact us at the above indicated email address.
WARNING INFORMATION
WARNING INFORMATIONWARNING INFORMATION
WARNING INFORMATION
This R/C Aircraft is not a toy! Read and understand the entire manual before assembly. 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. Do not over look the warnings
and instructions enclosed or those provided by other manufactures’ products. If you are not an experienced pilot and airplane modeler you
must use the help of an experienced pilot or an authorized flight instructor for the building and flying of this model aircraft.
These instructions are suggestions only on how to assemble this model. There are other ways and methods to do so. Twisted Hobbys has
no control over the final assembly, the materials and accessories used when assembling this kit, or the manner in which the assembled
model, installed radio gear and electronic parts are used and maintained. Thus, no liability is assumed or accepted for any damage
resulting from the use of the assembled model aircraft or from this instruction manual including but not limited to direct, indirect,
incidental, special, and consequential damages. By the act of using this user-assembled product, the user accepts all resulting liability. In
no event shall Twisted Hobbys’ liability exceed the original purchase price of the kit.
SHIPPING DAMAGE
SHIPPING DAMAGESHIPPING DAMAGE
SHIPPING DAMAGE
Twisted Hobbys checks each plane before shipping to ensure that each kit is in fine condition. We have no bearing on the condition of any
component parts damaged by use, modification, or assembly of the model. Inspect the components of this kit upon receipt. If you find any
parts damaged or missing, contact Twisted Hobbys immediately. We will not accept the return or replacement of parts on which assembly
work has already begun. Twisted Hobbys reserves the right to change this warranty at anytime without notice.
OUR MISSION
OUR MISSIONOUR MISSION
OUR MISSION
To provide the best products and service to our customers at the lowest prices possible. We take great pride in
our company, our commitment to customer service and in the products we sell. Our online store is designed
to provide you with a safe and secure environment to browse our product catalog.
Thank you for shopping with Twisted Hobbys!

Rev: 2014.11.04.v002a 4
SAFETY NOTES
SAFETY NOTESSAFETY NOTES
SAFETY NOTES
Before assembling and flying this model, read carefully any instructions and warnings of other
manufacturers for all the products you installed or used on your model, especially radio
equipment and power source.
Check thoroughly before every flight that the airplanes’ components are in good shape and
functioning properly. If you find a fault do not fly the model until you have corrected the
problem.
Radio interference caused by unknown sources can occur at any time without notice. In such a
case, your model will be uncontrollable and completely unpredictable. Make sure to perform a
range check before every flight. If you detect a control problem or interference during a flight,
immediately land the model to prevent a potential accident.
Youngsters should only be allowed to assemble and fly these models under the instruction and
supervision of an experienced adult.
Do not operate this model in a confined area.
Do not stand in line with, or in front of a spinning propeller and never touch it with any object.
IMPORTANT: PRIOR TO ANY ASSEMBLY
Please Note: after removing kit from shipping box, lay each piece flat on a
hard surface, this will allow the airframe to straighten out if lightly bent
from shipping. Do not worry since EPP is very pliable and can be bent back
if out of shape.

Rev: 2014.11.04.v002a 5
kit cont
kit contkit cont
kit contents
entsents
ents
MAIN AIRFRAME OMPONENTS AND KITS
Double check that you have all the
above pictured items. The Carbon
bundle includes tail push rods and
wing spars. Also pictured above is the
bag with all the small hardware items,
see the detail to the right for items is
should contain.
HARDWARE KIT DETAIL
Double check that you have all the
above pictured items. There are two
extra snap links included and the use
of the shrink tubing is optional. If any of
the airframe or hardware items are
missing, contact Twisted Hobbys
before starting your build.

Rev: 2014.11.04.v002a 6
Tools
Tools Tools
Tools &
&&
& A hesives Nee e
A hesives Nee e A hesives Nee e
A hesives Nee e
•ighter
•Small drill bits
•Tape Measure and Ruler
•Black Sewing Thread
•Welders Glue
•Hobby Knife w/new Blade
•Needle Nose Pliers
•Wire Cutters
•ow Temp Hot Glue Gun
•Course Sand Paper
•Scissors
•Small Phillips Screw Driver
•Thin & Medium CA
•CA Applicator Tips
•Activator
Tools shown and listed are suggestions only
.
D
epending
on your building technique you may not need everything
indicated – and/or – you may find that other tools
available to yourself may be of benefit to your Build.
It is also recommended that you have a flat building
surface, one that will accept stick pins and push pins.
An Acrostic Ceiling panel from your local hardware store
fits this bill nicely, and will lay flat on your work table.
Over size / long push pins are available at your local
craft store. These two items are by no means required,
but will aid in the building process, and can be used for
future projects.

Rev: 2014.11.04.v002a 7
THE BUILD
THE BUILDTHE BUILD
THE BUILD
CONSTRUCTION METHODS:
Building surface should be at least 2ft x 4ft and flat. Weights or some small heavy objects will be handy for holding things in place during
the time glue is setting.
Welders glue is used for FOAM TO FOAM joints. Thin and Medium CA are used on the PLASTIC TO FOAM and CARBON TO FOAM joints.
When using the Welders glue for a butt joint, apply a thin film to each surface, allow to sit for approx five minutes and then
assemble. Note that this method will create a nearly instant bond, so locate carefully when bringing the two pieces together. If alignment
is necessary or a slip joint, do not allow the glue to tack up, simple apply and join immediately, you will have several minutes to locate the
two parts before the glue sets up. In most cases the parts being glued can be handled with care in 30 minutes, full cure is approx 24
hours.
Locate the hinged items as shown above, bend them back
onto each other as s
hown and let set for an hour or so. This
process will help to loosen up the movement of the control
surface, and is necessary to prevent servo damage.
Gluing the snap links onto the ends of the controls rods is
important to do at this time... the glue will need to cure for
at least 24 hours in order to achieve it's full strength.
Locate the rods and snap links as shown above.

Rev: 2014.11.04.v002a 8
A quick link will be glued to the end o
f
the 4 control rods. Hold the rod with
your finger tips...
.... dunk it approx 1/2" into the nozzle
of the Welders tube as show and twist a
time or two.
Pull the rod out and check that you
have a nice even coat of glue as shown,
if not, repeat the process
Attach a snap link as shown. Notice
that the snap link has a "saddled" area,
this should be where you rest the
control rod
Repeat this for the other three control
rods and set a side in a safe place to
dry for a minimum of 24 hours
Locate all of the electronics you will be
using. Now is a good time to check that
everything is working properly

Rev: 2014.11.04.v002a 9
If using the Twisted Hobbys' power
combo, please read the included notice
regarding the electronics warranty
Create a program in your transmitter
for this model and bind the receiver as
required
Hook up the entire electronis system as
shown. Mount and center the control
horns and servos as shown. Test for
proper operation of all items
Now is also a good time to Calibrate
your ESC according to the included
directions
Locate the items shown above and
apply a tack coat to the mating surfaces
and let sit for approx 5 minutes before
joining together
While the glue in the previous step is
tacking up, locate the wood kit and
remove the 4 wing ribs as shown

Rev: 2014.11.04.v002a 10
Once the glue has tacked up, bring all
the pieces together. Note that all the
tabs and slots should line up and parts
are "keyed" for proper orientation
Clean out the slots in the wing where
the ribs will be installed. Note that the
ribs are the same width as the wing
thickness
Check the fit of the ribs to the slot in
the foam, with the exception of the
humped area, the rib should sit flush
with both the top and bottom surfaces
Test fit the wing spars and ribs on the
bench out side of the wing first, this
will give you an understanding of how
the pieces go together. No Glue
Close up of the left underside pieces.
No Glue
The bigger ribs are located toward the
fuselage and the small ribs towards the
wing tip. Note that we are working from
the bottom side of the aircraft

Rev: 2014.11.04.v002a 11
Close up of how the spars stack up
inside the slot of the inner rib. No Glue
Take the whole assembly and lay it into
the slots on the bottom side of the wing
as shown... still test fitting.... No Glue
Gently lower the spar/rib assembly into
its precut area. Notice that the shorter
center spar should be centered and
entering the wing first
Make sure that the rib slots you cut
and the precut spar slots are deep
enough to allow everything to sit flush
as shown above
Once you are happy with the dry fit,
remove the spar/rib assembly and fill
all the appropriate slots in the wing
with Welders
Lower the spar/rib assy back into the
wing like was done on the dry fit. Press
down in all areas to fully seat the spars
and ribs into their respective slots

Rev: 2014.11.04.v002a 12
With a paper towel, wipe away any
extra Welders that has squished out
Put some weight on the wing in the
area of the spar/rib assembly as shown
and allow to dry for a couple hours
While that is drying, prepare the servos
and servo arms
Install one of the adjustable links into
the outer most hole of the servo arm,
than with the cupped side facing up
press the retainer onto the pin
Repeat with the other tail servo arm,
double check that your servos are
centered and secure the arms with the
small screw include with each servo
With the servo centered, mount the
round servo horn for the aileron servo
as shown and slightly enlarge the holes
so that the mount screws will self tap

Rev: 2014.11.04.v002a 13
Apply a thin layer of Welders to the
differencial horn as shown above
Install the Diff Horn from the
underside of the stock servo horn as
pictured, line u
p the holes between the
two pieces
Thread the screws in as shown, make
sure the holes in the stock horn were
big enough to let the screws tap in with
out splitting the horn
Trim off the extra screw length with
some side cutters and grind smooth
with a motor tool or hand file
Install the adjustable links from the
side shown, use the same technique as
with the tail servo horns
All the servos ready to install in a later
step. Make sure they are electronically
centered and that the horns are
attached as shown above

Rev: 2014.11.04.v002a 14
Building the landing gear struts is next
gather up the pieces shown. You will
also need some CA, Kicker and thread
Drill out the center of the wheels to fit
the small axle stubs, should be approx
1/16" diameter
With a drop of medium CA join the
rectangle carbon stut with the small
wood piece as shown.
Agian with a drop of medium CA attach
the stub axle as shown and hit with
kicker
Unspool approx. 6 to 8 inches of thread
as shown above
Wrap the thread as shown and soak
with thin CA and hit with Kicker. Install
the inside washer and also CA, slide on
the wheel and outside washer

Rev: 2014.11.04.v002a 15
CA the out washer and
hit with Kicker.
Medium CA works better here than the
thin, as it will not run along the axle
and freeze up the wheel
Install the wheel pant brace as shown.
Make sure that it is spaced out enough
to let the wheel spin freely
Align the brace as shown in the picture
above and then glue from the outside
with medium CA and Kicker
Repeat for the other strut and set aside
to be installed in a later step
Once happy with the fit up apply a thin
coat of Welders to the mat
ing surface of
the horizontal fuselage section
Install the aileron servo no glue) as
shown and test fit the bottom section of
the fuselage, it may need to be trimmed
a little around the aileron servo.

Rev: 2014.11.04.v002a 16
Immediately apply a thin layer to the
mating surfaces of the lower vertical
fuselage....
Bring the two pieces together. You will
have a little time to work with and
adjust for squareness
Make sure pieces are true to each
other, and fully seated to one another,
apply pressure for approx 15 min.
before moving
As with the bottom fuselage, check the
fit of the upper fuselage and make
additional cuts as needed
Apply a thin layer of Welders to the
mating surface as shown
Install the tail servos. Just set them in
place. Do Not Glue them at this time.

Rev: 2014.11.04.v002a 17
Also apply a thin layer to the upper
vertical fuselage piece. Note avoid the
areas that come into contact with the
servos
Avoid glue in these areas. The goal is
for no glue to come into contact with
any part of the servo
Join the pieces together and make sure
they are fully seated to each other
While the glue is still wet, make any
adjustments as needed for squareness.
Let the glue set up for 15 or 20 minutes
before handling
Tack up method will be used to attach
the trusses. to do this apply a medium
bead of Welders to the beveled area of
the truss....
Using the tack up method, attach the
rudder. Note it is more important to
link up the relief cut on the rudder
than it is to line up the bottom edges

Rev: 2014.11.04.v002a 18
.... position the truss in place and then
remove immediately. This transfers
some of the glue... let it tack up then
install
Repeat for the other side but leave the
last 3 or 4 inches as shown above) free
of glue
Motor mount is next... roughen up the
glue side of the mount and coat with a
medium amount of Welders and let
tack up.
Apply a medium coat of Welders to the
mating area of the fuselage nose and let
tack up as well
While the motor mount parts are
tacking up locate all the above pieces
and break them from their plastic trees
Using the pre-cut slots for the aileron
horns as a guide, increase the depth so
the horns will fit flush to the bottom
surface

Rev: 2014.11.04.v002a 19
With the tip of the Welder's tube,
squeeze some glue into the slit, and put
a skim coat of glue on the horn
Install the aileron horn so that it is
flush with the under side of the wing,
and so that the hole is in line with the
pivot point of the control surface
By now the motor mount should have
had time to tack up. Install it to the
nose of the aircraft
Back to the horns... Do the same thing
with the slot on the elevator, squeeze
some glue in and apply a skim coat of
glue to the mating area of the horn
Install the horn from the TOP side of
the elevator, and make sure the hole in
the horn is in line with the pivot point
of the elevator
Repeat the process with the rudder,
install from the flat side as shown

Rev: 2014.11.04.v002a 20
Cut all the shown parts from there EPP
foam trees, split the rear of the 4
inboard SFGs as shown
Clean out the slots on the wing for the
SFGs, test fit them before applying the
glue.
Attach the three different SFGs to each
wing as shown... Welders or CA can be
used to install theses
Elevator Tip... install one on each side.
Again, either Welders or CA can be
used for attachment
Lastly the T-Canalizer. Make sure all
the add-ons are all perpendicular to
their respective surfaces
The next couple steps are optional, but
HIGHLY recommended. Blenderm will
be added to the motor mount and hinge
line stress points