Neptune Seaplane25 ARF
Instruction Manual
Specifications
Wingspan: 1270mm (50in)
Length: 1155mm (45.5in)
Wing Area: 34.8 sq dm (539.4 sq in)
Weight: 1950g (4.30lbs)
Product Highlights
Removable hatch on the fuselage for easy battery
access. Includes high quality hardware.
Classic Neptune trim scheme.
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Dear Customer,
Congratulations on your purchase of Neptune Seaplane 25 ARF from Value Hobby. We thank you for
your generous support, and hope you enjoy your new airplane.
At Value Hobby, we hope to offer competitive prices, good performance, and products that you can setup
and use with ease. That’s why we extensively researched and tested this airplane, and suggested all the
products necessary for you to setup properly. We understand that you have many choices when purchasing,
and we are grateful you choose to buy from us.
As vendors, one of the most gratifying things for us is to hear from our customers. We would welcome any
suggestion to help us improve. Please make us aware of any errors and imperfections in the airplane or the
instructions, or about the setup that we suggested. We hope you’ll find our setup suggestions to be helpful,
and enjoy flying your new airplane. Please feel free to contact us at (630) 948-0947 or email us at
support@valuehobby.com
Disclaimer
By purchasing and/or building this model, user assumes ALL liability and risk involved with this product.
This model should be built and flown by an experienced pilot and only flown at AMA sanctioned sites.
Value Hobby guarantees this model to be free of defects in materials and workmanship at the date of purchase.
This warranty does not cover any parts damaged by use or modifications. In no way shall Value Hobby’s liability
exceed the original cost of the purchased model. Further, Value Hobby reserves the right to modify this
warranty without notice. Value Hobby has no control over the final stages of assembly or the material used for
the final assembly. No liability shall be assumed nor materials used for the final user-assembled product. By the
act of using the final product the user accepts all resulting liability. Value Hobby, as a R/C product vendor,
provides a top quality airplane and instructions to complete the model. The quality and flight characteristics of
the finished model depend greatly on how it is built; we cannot guarantee the performance for the completed
model and representations are expressed or implied as to the performance of the completed model. 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.
Safety in Assembly
During assembly of this aircraft, you will be asked to use sharp knives and hobby adhesives. Please follow
all safety procedures recommended by the manufacturers of the products you use, and always follow
these important guidelines:
ALWAYS protect your eyes when working with adhesives, knives, or tools, especially power tools. Safety
glasses are the best way to protect your eyes.
ALWAYS protect your body, especially your hands and fingers when using adhesives, knives, or tools, especially
power tools. Do not cut toward exposed skin with hobby knives. Do not place hobby knives on tables or
benches where they can roll off or be knocked off.
ALWAYS have a first-aid kit handy when working with adhesives, knives, or tools, especially power tools.
ALWAYS keep hobby equipment and supplies out of the reach of children.
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Safety in Flying
This is NOT a toy! It is a very high-performance RC airplane capable of high speeds and extreme maneuvers.
It should only be operated by a competent pilot in a safe area with proper supervision.
ONLY fly your aircraft in a safe, open area, away from spectators and vehicles–and where it is legal to fly.
NEVER fly over an unsafe area, such as a road or street.
Never fly too close to yourself or spectators.
Never run your motor inside a house or building with the propeller attached – Remove the prop for safety.
Required Items
CA Glue – Thin and Thick
Epoxy glue
Hobby Knife
Small Phillips Screwdriver
Set Metric Allen Wrenches
Scissors
Small Pliers
Wire Cutters
Masking tape
Optional – Heat gun
Before Starting Assembly
Examination
Unpack your airplane and examine the components. Check for damage of any kind. If you see any
damage, please contact Value Hobby immediately.
Covering
Your airplane was packed in plastic at the factory without any wrinkles in the covering. You may notice some
wrinkles now; more likely, you will notice a few in a day or two or the first time you take the plane out to the
flying field. These wrinkles are the result of wood shrinkage and/or expansion. Balsa wood changes size and
shape slightly as it is exposed to varying humidity in the air. This is a natural property of balsa wood. As your
airplane adjusts to the weather in your part of the world, wrinkles may appear and disappear. Wrinkles may be
removed with the gentle application of heat to the covering material on your airplane. The best tool to use is a
hobby heat gun. Apply the heat gently: the covering material will shrink as you apply the heat, and this will
remove the wrinkles. BE CAREFUL! Too much heat applied too quickly can damage the covering, either by
causing it to pull away from the wood at seams and corners or even by melting it. The covering will shrink at
low temperature with patient application of heat.
Wrinkles in the covering DO NOT affect flight performance.
Remove the canopy before attempting to use heat on your covering! The canopy is made of thermoactivated plastic and WILL deform with the application of heat. Do not apply heat to the canopy.
If you need to clean your airplane, we recommend using a damp towel. The paint used on the canopy and cowl
is not safe for all cleaners. In particular, DO NOT use alcohol on these parts, it will remove the paint.
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RECOMMENDED RADIO EQUIPMENT
Product
SKU
Quantity
Radio
4 channel
FLY-RC-1310
1
Servo
Emax ES3104 Metal Gear Mini Servo
EMX-SV-2472
4
Y-Harness
Universal Servo Y-Harness 12-Inch (Futaba "J" and JR Compatible) AMS-AC-0869
1
Extension
Universal Servo Extension 12-Inch (Futaba "J" and JR Compatible) AMS-AC-0560
1
RECOMMENDED POWER SETUP
Light Power Setup
Product
SKU
Motor
Gforce G15 (35-42) 1100KV
SAT-MT-1741
ESC
Hobbywing Flyfun 60A ESC
HWG-SC-0241
Battery
GForce Elite Series 40C 2200mAh 3S 11.1V
FLM-LP-1804
Prop
12 x 6E
EMX-MP-1769
High Power Setup
Product
SKU
Motor
Gforce G25 (35-48) 850KV
SAT-MT-1882
ESC
Hobbywing Flyfun 60A ESC
HWG-SC-0241
Battery
GForce Elite Series 40C 2200mAh 4S 14.8V
FLM-LP-1810
Prop
13 x 6.5E
EMX-MP-1765
OPTIONAL ACCESSORIES:
Product
SKU
Quantity
GT Power C6 6S LiPO Charger
GTP-CH-1427
1
Quickie Thin CA
VHB-AC-2097
1
Quickie Medium CA
VHB-AC-2098
1
Foam Field Stand
VHB-AC-1997
1
GT Power 130A Watt Meter
GTP-AC-0591
1
T Discharge Connector Female
AMS-AC-1914
1
T Discharge Connector Male
AMS-AC-1913
1
LiPO Battery Charging Bag
VHB-LP-0330
1
Tarot Socket Head Drivers Set
FYM-AC-2100
1
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Main Parts and Accessories:
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Part Lists:
Fuselage x 1
Wing panel x 2
Aileron x 2
Horizontal stabilizer x 1
Elevator x 1
Fin x 1
Rudder x 1
Cowling x 1
M3*12mm (0.5-inch) round head self-tapping screw x 6 for mounting cowling
Motor mount x 1
M3*12mm (0.5-inch) screw x 1 for mounting motor mount
M3*20mm (0.8-inch) screw x 4 for mounting motor
M3 washer x 4 for mounting motor
M3 nut x 4 for mounting motor
Battery hatch x 1
M3*12mm (0.5-inch) screw x 2 for mounting battery hatch
Tie cable 300mm (11.8-inch) x 2 for binding battery
Rear hatch x 1
M3*12mm (0.5-inch) screw x 4 for mounting battery hatch
Tail skid x 1
Wing joiner x 1
M3*40mm (1.6-inch) wing bolt x 2 for mounting wing
M3 washer x 2
Wing bolt plate x 1
Float x 2
Aileron pushrod wire Φ1.8x145mm (5.7-inch) x 2
Rudder pushrod wire Φ1.8x655mm (25.8-inch) x 1
Elevator pushrod wire Φ1.8x750mm (29.5-inch) x 1
Elevator pushrod wire Φ1.8x50mm (2.0-inch) x 1
Pushrod connector x
5 Control horn x 4
Back plate x 4
Clevis x 4
M2*16mm (0.6-inch) screw x 4 for mounting rudder and elevator control
horn M2*20mm (0.8-inch) screw x 4 for mounting aileron control horn
M2*10mm (0.4-inch) clevis bolt x 4
Hinge x 20
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Section1: Install the ailerons and floats
Step1. Drill a 3/32-inch hole into the center of each
hinge slot in the aileron and wing panel. Trim the
covering away from each hinge slot to ensure that
the hinges will be properly glued in place.
Step2. Insert four hinges into the wing
panel, and drop some thin CA into the hole
in the hinge slot to glue the hinge to the
wing panel. Make sure to glue both the top
and bottom.
Step2. Attach the aileron to the wing panel
through the hinges, and use a hobby knife to set a
small gap between the wing and aileron. Also
check the aileron can move freely without rubbing
at the wing foot.
Step3. Apply some thin CA to glue the aileron to
the wing panel. Make sure to glue both the top
and bottom. Once the CA has cured, gently pull on
the aileron to make sure the hinges are secure. If
not, apply more CA to loose hinges.
Step4. Use the epoxy to glue the float to the
wing. Make sure the float is aligning with the
leading edge of the wing.
Step5. Repeat step1 to step4 for the
remaining aileron and float.
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Section2: Install the ailerons servo
& linkages
Step1. Use a hobby knife to remove the covering
for inboard servo in the bottom of the wing.
Step2. Electronically center the servo, and
install the servo arm with pushrod connector to
the servo.
Step3. Install the servo onto the wing using two selftapping screws provided with servo. Use three
M2*8mm (0.3in) self-tapping screws to install the
servo cover to the wing. Trim the cover as shown.
(Note: you need use the glue to seal the gap.)
Step4. Connect the aileron servo pushrod
Φ1.8x145mm (5.7-inch) to control horn using
clevis and M2x10mm (0.4-inch) clevis bolt.
Step5. With the pushrod wire aligned 90 degrees
to hinge line and the holes in the control horn
aligned with the hinge line, use two M2x20mm
(0.8-inch) screws and back plate to install the
control horn to the aileron.
Step6. With control surface centered, tighten
the grub screw to secure the pushrod to
pushrod connector.
Step7. Repeat step2 to step6 for the
remaining servo.
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Section3: Install fin and rudder
Step1. Position the fin on the fuselage, and use
a felt-tipped pen to trace the outline of the fin.
Step2. Use a hobby knife to remove the coverings
along the line drawn in the previous step. Apply
some epoxy to the bare wood on the fuselage
and the fin to secure the fin to the fuselage.
Step3. Use thin CA to glue two hinges to
the rudder.
Step4. Use thin CA to secure the rudder to the
fin. Position the tail skid on the fuselage, and use
a felt-tipped pen to trace the outline of the fin.
Step5. Use a hobby knife to remove the coverings
along the line drawn in the previous step. Apply
some epoxy to the bare wood on the fuselage and
the tail skid to secure the tail skid to the fuselage.
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Section4: Install horizontal
stabilizer and elevator
Step1. Attach the elevator to horizontal stabilizer
in the same procedure as installing the aileron in
section1.
Step2. Use epoxy to glue the horizontal stabilizer
and elevator assembly to the fuselage. (Note: the
stabilizer should be parallel with work surface
and centered in the fuselage.)
Step3. Use a hobby knife to remover the coverings
for the rear hatch. (for sliding the pushrod wire
through the fuselage in following steps)
Section5: Install elevator and
rudder servo & linkages
Step1. Connect the
Elevator pushrod wire
Φ1.8x750mm (29.5-inch) to control horn through
clevis and M2*10mm (0.4-inch) clevis bolt.
Slide the pushrod wire through the fuselage
as shown.
Step2. Use four
M3*12mm (0.5-inch) screws
to install the rear hatch to the fuselage.
Step3. With pushrod wire aligned 90 degrees to
the hinge line and the holes in the control horn
aligned with the hinge line, use two
M2*16mm
(0.6-inch) screws and back plate to install the control
horn to the elevator.
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Step4. In the same procedure install the
control horn onto the rudder.
Step5. Install the servo arm with pushrod
connector to the servo, and install two servos into
the fuselage. (Electronically center the servo
before mounting).
Step6. With control surface centered, tighten
the grub screws.
Section6: Install elevator servo
and linkage (optional)
We offer another installing method for
elevator servo.
Step1. Use a hobby knife to remove the
coverings for inboard servo.
Step2. Install the servo onto the
horizontal stabilizer.
Step3. Connect
pushrod wire Φ1.8x50mm (2.0-
inch) to control horn.
With pushrod wire aligned
90
degrees to the hinge line and the holes in the
control horn aligned with the hinge line, use two
M2*16mm (0.6-inch) screws and back plate to
install the control horn to the elevator.
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Step4. With control surface centered, tighten
the grub screw.
Section7: Install motor and prop
Step1. Prepare a extension cable for connecting
the battery and ESC.
Step2. As shown thread a 12-inch servo extension
and battery-to-ESC cable though the motor
mount as shown.
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Step3. Remove the coverings for motor mount.
Step4. Insert the motor mount into the fuselage.
Step5. Use one
M3*12mm (0.5-inch) socket
head
self-tapping screw
to secure the motor
mount to
the fuselage.
Step6. Use four
M3*20mm (0.8-inch) screws, four
M3 washer and four M3 nut to install the motor
to the motor mount.
Step7. Position the cowling in the motor mount.
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Step8. Drill the mounting holes.
Step9. Use six
M3*12mm (0.5-inch) self-tapping
screws to secure the cowling to the motor mount.
Step10. Install the prop and spinner.
Step11. You can use two
M3*12mm (0.5-inch)
screws to install the battery hatch to the fuselage.
Section8: Install wing
Step1. Use wing joiner and epoxy to join two
wing panels together.
Step2. Install the wing by aligning the dowels
from the wing into the holes in the fuselage.
Step3. Secure the wing using two wing bolts and
one bolt plate.
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Section9: Set up CG and control throws
Measure the CG from the leading edge of wing
panel. Adjust the battery pack; the CG should be
at 25-30% MAC (Mean Airfoil Chord).
The CG is 79mm (3.1-inch) from the leading edge
of the wing.
Set up the control throws:
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2013-1-24
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