Twisted Hobbys CRACK PITTS Assembly Manual
Rev: 2015.09.18.v01a
page 1
USA Distributor
Twisted Hobbys
www.twistedhobbys.com
MOTOR: 1x 24-26g/1450kv Outrunner
ESC: 1x 10-12 amp
SERVOS: 2x 5g - 1x 9g
PROP: 1x 9x4.7sf - 2s / 8x4.3sf - 3s
BATTERY: 2s or 3s / 450mAh
RADIO: 4 channel
WINGSPAN: 30”
LENGTH: 32”
AUW: 180 to 200 grams
CRACK PITTS
CRACK PITTS
*SHOWN WITH OPTIONAL LANDING GEAR
Rev: 2015.09.18.v01a
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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: 2015.09.18.v01a
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TWISTED HOBBYS
Website: www.twistedhobbys.com – email: sales@twistedhobbys.com
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
This R/C Aircraft is not a toy! Read and understand the entire manual before assembly. If misused, it c an cause serious bodily harm and
property damage. Fly only in open areas, and AMA (Academy of Model Aeronautics) approve d 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 d o so. Twisted Hobbys has
no c ontrol over the final assembly, the materials and accessories used when assembling this kit, or the m anner in which the assembled
model, installed radio gear and electronic p arts are used and maintained. Thus, no liability is assumed or accepted for any d amage
resulting from the use of th e assemb led 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
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 mod el. Inspect the components of this kit upon receipt. If you find any
parts damaged or missing, contact Twis ted Hobbys immediately. We will not accept the return or replacement of parts on which assembly
work has already begun. Twis ted Hobbys reserves the right to change this warranty at anytime without notice.
OUR MISSION
To provide the best products and service to our customers at the lowest prices pos sible. 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: 2015.09.18.v01a
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kit contents
Fuselage Parts
Wing Parts
Double check that you have all the above pictured items. Note -
Some kits might have slight deviations from the above pictured items.
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kit contents (cont.)
Hardware Kit Detail
Tail Surfaces & Hardware Kit
Double check that you have all the above pictured items. Note -
Some kits might have slight deviations from the above pictured items.
Rev: 2015.09.18.v01a
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TOOL AND ADHESIVES NEEDED
Tools shown and listed are suggestions only.
Depending 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
Lighter
Small Drill Bits
Tape Measure and Ruler
Black Sewing Thread
Welders Glue
Hobby Knife w/new Blade
Needle Nose Pliers
Wire Cutters
Low Temp Hot Glue Gun
Course Sand Paper
Scissors
Small Phillips Screw Driver
Thin and Medium CA
CA Applicator Tips
Activator
Rev: 2015.09.18.v01a
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the build
CONSTRUCTION METHODS:
Building surface should be at least 2ft x 4ft and at. 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 lm to each surface, allow to sit for approx ve 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.
The above picture items will be needed to nish the model.
A power combo (Twisted Hobbys’ Combo pictured above), a
battery and a fresh tube of Welders. Note - the Battery,
Receiver and Welders are NOT part of the power combo,
everything else shown is.
Start the build by locating the two wings, the elevator and
the rudder. Fold back as shown and weigh them down for
about an hour to loosen up the hinge area. Now is also a
great time to setup your radio and to test that all your
electronics are functioning properly.
Rev: 2015.09.18.v01a
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Find the horizontal fuselage piece and
the elevator. Join them together using
the Tack Up Method.
Notice that the two parts are “keyed” to
insure proper orientation.
Once the glue has tacked up, bring the
two pieces together, press rmly to get
a good bond.
Press the servo into the cut out. It will
stick up a little on the near side. Servo
arms will be install later. They would
just get in the way at this time.
Install the servo as shown, from the
underside/bottom of the horizontal
fuselage piece. Note - no glue at this
time, gluing the servos in will be done
towards the end of the build.
Flip the assembly over and locate your
elevator servo. If using the power
combo servos, the cut out will match
perfectly, if using other servos, some
trimming may be necessary.
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Locate the vertical fuselage section, and
put a fresh blade in your hobby knife.
Split the vertical fuselage section down
the center of the tabs. Note, the tabs
have small “V”s cut in them to help
locate the exact center.
Once all the tabs are split, you should
have something like pictured above.
Once you are satised with the test t,
separate the two pieces and re-
assembly using the Wet Method. Make
sure and apply glue to all the mating
surfaces and tabs.
Test t the lower vertical fuselage to the
horizontal assembly as shown. All tabs
should fully engage, and the two pieces
should be square to each other.
Split/Separate the small tab for the slot
shown above so that it is free as
pictured.
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Make sure all the tabs are fully seated
as was done with the test t, wipe away
any extra glue and weigh down so that
everything will dry at.
While the glue is still wet, check for
squareness and tweak a little as
needed.
Locate the beveled foam trusses as
shown above.
Make sure there is a good bond. Use a
gentle touch when pressing the truss to
the fuselage. Pressing too hard will
cause the fuselage member to be out of
square.
Align the square end up with the edge
of the hinge relief as pictured above,
and attach the truss at 45 degrees to
the two fuselage members.
Stating with the side shown, apply a
medium bead of Welders the entire
length of the beveled area.
Rev: 2015.09.18.v01a
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Next is the far side, apply a medium
bead of Welders as with the other side,
but leave approx 4in free of glue on the
pointed end.
Attach the truss like was done on the
other side and note that there is approx
4in free of glue. This will allow access to
all the wires and will be secured to the
fuselage in a later step.
Make sure the two fuselage pieces are
still square to each other, allow the glue
to dry before moving on to the next
step.
Locate the top vertical half of the
fuselage. Test t, make sure that all the
tabs and slots are able to fully engage.
Make sure the wire does not get
bunched up under the servo in the hole
and that the servo is fully installed and
sitting rmly on it’s anges as pictured
above. Do Not Glue at this time.
Locate the rudder servo. If using the
Twisted Hobbys power combo servos,
no trimming will be need. Fish the wire
thru on the same side as the elevator
wire, and press the servo into it’s slot.
Rev: 2015.09.18.v01a
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Once happy with the t up, remove it
and apply a medium bead of Welders to
the mating surfaces. Avoid the servos
and areas around were the slits are in
the vertical fuselage pieces.
Starting from the front... align the nose
surfaces and work towards the tail
engaging the slots along the way. Press
and wiggle to make sure the tabs are
full seated into their respective slots.
The nose surfaces should all be ush
as pictured above. In a later step, this
is where the motor mount will attach
to, and it is important that they are
even to create a at surface.
Locate the two wood fuselage stiffeners
as pictured above. They should be
approx 2x9x90 and 2x9x150
millimeters.
Once happy with the squareness. Set
the assembly aside to dry. Stand the
assembly up as shown, this will avoid
any awkward stress to the airframe
while the glue is drying.
While the Welders is still wet, check for
squareness along the length of the
fuselage. Tweak as needed for a nice
and true assembly.
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