Great Planes GPMA1928 User Manual
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Wingspan: 38 in [965mm]
Wingspan
Wing Area: 242 in2 [15.6dm2]
Wing Area:242 in2 [15.6dm
Weight: 23-25 oz [650-710g]
Wing Loading: 13.7-14.8 oz/ft2 [42-45 g/dm2]
Wing Loadin
Length: 28 in [710mm]
Radio: 4-Channel with four micro servos
R
Electric Motor: RimFire™ 400 (28-30-950kV)
E
ESC: 25A brushless
E
Weight:23-25 oz [650-710
8 in [965mm
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28 in [710mm
: 4-
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400 (28-30-950kV)
WARRANTY
ARRAN
Great Planes® Model Manufacturing Co. guarantees 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
modifi cation. In no case shall Great Planes’ liability exceed the original cost of the purchased kit. Further,
Great Planes reserves the right to change or modify this warranty without notice.
In that Great Planes has no control over the fi nal assembly or material used for fi nal assembly, no liability shall be
assumed nor accepted for any damage resulting from the use by the user of the fi nal user-assembled product. By
the act of using the user-assembled product, the user accepts all resulting liability.
If the buyer is not prepared to accept the liability associated with the use of this product, the buyer is
advised to return this kit immediately in new and unused condition to the place of purchase.
To make a warranty claim Hobby Services
send the defective part 3002 N. Apollo Dr., Suite 1
or item to Hobby Services Champaign, IL 61822 USA
at this address: (217) 398-8970 Ext. 5
Include a letter stating your name, return shipping address, as much contact information as possible (daytime
telephone number, fax number, e-mail address), a detailed description of the problem and a photocopy of the
purchase receipt. Upon receipt of the package, the problem will be evaluated as quickly as possible.
READ THROUGH THIS MANUAL BEFORE STARTING CONSTRUCTION. IT CONTAINS IMPORTANT INSTRUCTIONS
AND WARNINGS CONCERNING THE ASSEMBLY AND USE OF THIS MODEL.
TABLE OF CONTENTS
ADDITIONAL ITEMS REQUIRED
ADDITIONAL ITEMS REQUIRED .....................................2
Radio System .................................................................2
Batteries and Charger ....................................................2
Hardware and Accessories ............................................2
Adhesives & Building Supplies .......................................3
Optional Supplies and Tools ...........................................3
PREPARATION .................................................................. 3
ASSEMBLE THE WINGS ................................................... 4
Join the Ailerons and Mount the Servos ........................4
Hook Up the Ailerons .....................................................5
Join the Wings ................................................................5
Mount the Wheels and Landing Gear .............................6
ASSEMBLE THE FUSELAGE ...........................................7
Glue in the Horizontal Stabilizer (Stab) ..........................7
Hinge the Elevators and Rudder ..................................10
Hook up the Elevator and Rudder ................................11
Mount the Motor and ESC ............................................12
Mount the Battery and Receiver ...................................14
Optional: Install Pilot Figure (Not Included) ..................14
GET THE MODEL READY TO FLY ..................................15
Set the Control Throws .................................................15
Balance and Mount the Propeller .................................16
Apply the Decals ..........................................................16
Balance the Model (C.G.) .............................................16
Balance the Model Laterally .........................................17
FLYING .............................................................................17
Prefl ight ........................................................................17
Takeoff ..........................................................................17
Flight ............................................................................18
Landing ........................................................................18
REPLACEMENT PARTS ..................................................18
RADIO SYSTEM
The Chipmunk 400 ARF requires a four-channel radio with a
small receiver that will fi t into available space in the fuselage
not already occupied by the battery. The following servos
and servo extensions are also recommended:
(4) Futaba® S3114 micro servos (FUTM0414)
(2) Hobbico® Command™ 6" [150mm] extensions
(HCAM2000)
(1) Futaba dual servo extension (FUTM4130)
BATTERIES AND CHARGER
Most 3S (11.1V) LiPo batteries in the 1200mAh – 1500mAh
range should fi t fi ne in the Chipmunk. Following are a few
suitable recommendations:
11.1V ElectriFly 1300mAh 25C (GPMP0505)
11.1V ElectriFly BP 1250mAh 20C (GPMP0715)
11.1V FlightPower® 1200mAh 30C (FPWP6105)
11.1V ElectriFly 1200mAh 30C (GPMP0836)
11.1V ElectriFly 1300mAh 30C (GPMP0840)
Be certain to read and follow all the instructions and
precautions that come with LiPo batteries and chargers.
Charge LiPo batteries only with chargers intended for LiPo
batteries or with chargers that have a LiPo setting. Following
is a suitable charger:
Great Planes PolyCharge4™ DC-only LiPo battery
charger (GPMM3015)
Additionally, one (1) Great Planes ElectriFly
Equinox™ LiPo Cell Balancer w/3S battery adapter
(GPMM3160) for each battery to be charged
simultaneously is recommended. (If you wish to
charge three batteries simultaneously, three Equinox
balancers will be required.)
Finally, if charging the battery from a 120V AC outlet
is preferred (rather than using a 12V battery), a 12
Volt power supply will also be required (Hobbico 12
Volt Power Supply - HCAP0250).
HARDWARE AND ACCESSORIES
Following is the list of additional hardware and accessories
required to fi nish the Chipmunk 400. Order numbers are
provided in parentheses.
Great Planes RimFire 400 (28-30-950kV) out-runner
brushless motor with prop adapter (GPMG4560)
Great Planes Silver Series 25 Amp Brushless
Electronic Speed Controller (GPMM1820)
(1 pkg. of 3) Great Planes 3.5mm male/2mm female
bullet adapters (GPMM3122)
2
Great Planes 8x6 Power Flow™ Slo-Flyer Elec Prop
(pkg. of 2, GPMQ6610)
(1 pkg) Great Planes adhesive-back Velcro®
(GPMQ4480)
Double-sided foam mounting tape (GPMQ4440)
Stick-on segmented lead weights (GPMQ4485)
Great Planes 3/8"x3" [10x80mm] heat shrink tubing
(GPMM1060)
ADHESIVES & BUILDING SUPPLIES
In addition to common household and hobby tools, this
is the “short list” of the most important items required to
assemble the Chipmunk 400. Great Planes Pro™ CA glue is
recommended.
Thin CA (1/2 oz. [15g] Thin Pro CA, GPMR6001)
Medium CA (1/2 oz. [15g] Medium Pro CA+,
GPMR6007)
30-minute epoxy (Pro 30-minute epoxy, GPMR6047)
CA applicator tips (HCAR3780)
Threadlocker thread locking cement (GPMR6060)
#11 blades (5-pack, HCAR0211)
#1 Hobby knife (HCAR0105)
The following drill bits were also used: 1/16" [1.6mm],
1/8" [3.2mm], 5/64" [2mm]. For precision, the following
“numbered” drills were also used, but if you cannot
get numbered drills a hobby knife could be used
instead: #57 (.043" [1mm]), #55 (.052" [1.3mm])
PREPARATION
1. Lay three or four
paper towels over each
other and cut the stack
into small squares.
These small paper towel
squares, dampened with
denatured alcohol, will
come in handy for epoxy
cleanup and other general
cleanup during assembly.
OPTIONAL SUPPLIES AND TOOLS
Here is a list of optional items mentioned in the manual that
will help you build the Chipmunk 400.
Williams Brothers 1/8-scale Sportsman pilot
(WBRQ1130)
#2x1/4" [6mm] or #2x1/2" [12mm] screws and #2
washers (for mounting optional pilot)
Hobby paints/paint brushes (for painting pilot)
2 oz. [57g] spray CA activator (GPMR6035) or 4 oz.
[113g] aerosol CA activator (GPMR6034)
CA debonder (GPMR6039)
CG Machine™ (GPMR2400)
Power Point Prop Balancer (TOPQ5700)
A model airplane covering iron with a protective
covering sock may also be necessary to retighten
the covering and remove any wrinkles that may have
formed after the model was originally covered at the
factory. If you don’t already have a covering iron,
the 21st Century® sealing iron (COVR2700) and 21st
Century iron cover (COVR2702) are recommended.
2. Remove the masking tape holding all the control
surfaces to their main parts. If necessary, clean off any
residual tape glue with a couple of your paper towel squares
dampened with naphtha (lighter fl uid).
3. Refer to the separate instruction sheet titled How To
Tighten Covering On ARF Models. Follow the instructions
to tighten the covering. If you prefer to get started on
assembly right away, the tightening process could be done
later (but it is usually easiest to do while the model is still in
separate pieces).
3
ASSEMBLE THE WINGS
JOIN THE AILERONS AND MOUNT THE SERVOS
1. Stick a small pin through the middle of three CA hinges.
Insert the hinges up to the pins into the hinge slots in one of
the wings.
4. Connect a 6" [150mm] servo extension to one of
your aileron servos. Use a piece of Great Planes 3/8" x 3"
[10 x 80mm] heat shrink tubing (GPMM1060, not included)
cut in half (or tape or other suitable clips intended for
this purpose) to secure the servo plugs so they cannot
accidentally become disconnected. Use a hobby torch or a
heat gun to shrink the tubing.
2. Fit the matching aileron to the hinges in the wing and
take out the pins. Make sure there is a small gap between
the leading edge of the aileron and the wing—just enough
to see light through or to slip a piece of paper through. Add
three or four drops of thin CA to the top and bottom of each
hinge, waiting a few seconds between each drop to allow the
CA to wick all the way in.
3. Hinge the other aileron to the other wing the same way.
After the CA has hardened, rapidly move the ailerons up and
down several times to “break in” the hinges so the ailerons
will move more freely.
5. Guide the servo wire down through the ribs and out the
hole in the top of one of the wings.
6. Temporarily mount the servo in the wing with two of the
included 2 x 4mm Phillips wood screws—the screw holes
are predrilled. Remove the screws and take the servo out of
the mount. Add a few drops of thin CA to the screw holes,
allow to harden, and then remount the servo.
4
7. Mount your other aileron servo in the other wing the
WING TRAILING EDGE
PARALLEL WITH WING
TRAILING EDGE
HORN MOUNTING PLATE
CONTROL HORN
2x10mm MACHINE THREAD
PHILLIPS SCREWS
ADJUST THE “V” BEND
same way.
HOOK UP THE AILERONS
Refer to this photo while hooking up the ailerons.
the aileron pushrod wire will fi t. Drill 5/64” [2mm] (or 3/32”
[2.4mm]) holes through the aileron for the horn mounting
screws and hook up the aileron as shown—note in the photo
that the horn is located on the aileron so the pushrod will be
perpendicular to the wing trailing edge and the servo arm.
3. Use pliers to adjust the V-bend in the wire so the aileron
will be centered.
4. Hook up the other aileron the same way. Note that the
aileron pushrods are connected to the servo arms nearest
the wing tips. This will allow the ailerons to move in opposition
(as they should).
1. Connect one of the aileron servos in the wing to your
receiver. Turn on the transmitter and hook up a charged
battery and the ESC so you can operate the servo with
the transmitter. With the trims on the transmitter centered,
mount the arm to the servo so it will be parallel (or as close
to parallel as you can reasonably get) with the trailing edge.
2. Enlarge the holes in one of the control horns included
with this kit with a #57 (.043” [1mm]) drill or a hobby knife so
JOIN THE WINGS
1. Use epoxy to glue the wing dowels into each wing with
1/4" [6mm] protruding.
5
MOUNT THE WHEELS AND LANDING GEAR
3/32" [2mm]
3/32" [2mm]
1. Insert the right and left main landing gear wires into
the wing so they will be angled forward.
2. Without using any glue, test fi t the wing halves together
with the plywood wing joiner. Make sure the wings fi t well
with no gap. Make any adjustments necessary for a good fi t.
3. Use 30-minute epoxy to glue the wings together with
the joiner—be certain to coat all mating surfaces—inside
the pockets where the joiner goes, all the way around the
joiner and the ends of both wing halves. Use masking tape to
hold the halves together and wipe away excess epoxy before
it hardens.
2. Holding a fl at landing gear strap over one of the gears
in the wing, drill a 1/16" [1.6mm] hole into the bottom of
the wing using the hole in the strap as a guide—note that
the strap must be mounted at an angle so the holes will be
no farther than 3/32" [2mm] from the wire. Otherwise, the
screws will miss the hardwood rail inside.
3. Mount the strap to the wing with a 2 x 8mm Phillips
wood screw. Holding the strap at an angle so the second
hole will be no farther than 3/32” [2mm] from the front of the
wire, drill the hole and install the second screw.
4. After the epoxy has hardened, carefully peel off the
masking tape. If necessary, use your covering iron to reattach
any lifted covering back down to the balsa underneath.
4. Mount the other strap over the other gear the same way.
Remove all the screws, add a drop of thin CA to each hole,
allow to harden, and then reinstall the straps and screws.
6
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