Value Hobby screamer 40 User manual

Screamer 40
Almost‐Ready‐to‐Fly
INSTRUCITION MANUAL
Specifications
Wingspan: 49in (1250mm)
Length: 47in (1200mm)
Wing Area: 465sq in (30sq dm)
Flying Weight (EP): Approx. 4.7lbs (2100g)

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Dear Customer,
Congratulations on your purchase of JS-40 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
[e-mail]
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
thermo‐activated 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
Flysky I6 6CH transmitter and receiver set
FLY-RC-4572
1
Servo
Towerpro MG996R standard servo
TWP-SV-0372
5(nitro)
4 (electric)
Y-Harness
Universal Servo Y-Harness 12-Inch (Futaba "J" and JR Compatible)
AMS-AC-0870
1
RECOMMENDED POWER SETUP
Product
SKU
Motor
Gforce G32 4250-800KV brushless motor
XYH-MT-0177
ESC
Hobbywing Flyfun 60A OPTO Brushless ESC
HWG-SC-0241
BEC
Hobbywing UBEC-3A
HWG-SC-0258
Battery
GForce Elite Series 40C 3300mAh 4S 14.8V LiPO
FLM-LP-1819
Prop
13 x 6.5 E
GFH-MP-2951
OPTIONAL ACCESSORIES:
Product
SKU
Charger
GT Power C6 6S LiPO Charger
GTP-CH-1427
Thin CA Glue
Quickie Thin CA
VHB-AC-2097
Medium CA Glue
Quickie Medium CA
VHB-AC-2098
Watt Meter
GT Power 130A Watt Meter
GTP-AC-0591
Connector
T Connector Female
AMS-AC-1914
T Connector Male
AMS-AC-1913
LiPO Bag
LiPO charging bag
RFI-AC-2725

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Main Parts of Airplane
Cowling x 1
Fuselage w/ canopy x 1
Wing panel x 2
Horizontal stabilizer x 1
Elevator half x 2
Fin x 1
Rudder x 1

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Small Parts and Accessories
Cowling mounting screw M3 x 12 4pcs
Rail mounts for engine 1pair
Mounting screws for rail mounts M4 x 20mm 4pcs
M4 washer 10pcs
Motor box 1pcs
Mounting screw for motor and motor box: socket head screw M4 x 16 8pcs
Lock nut for motor M4 4pcs
M4 washer for motor 4pcs
Fuel tank 240cc 1pcs
Zip tie 2pcs
Main landing gear 1pcs
Mounting screws for main landing gear socket head M4 x 16mm 3pcs
Screw for wheel pants: M2.5 x 12mm self-tapping screw 2pcs
Wheel 55mm diameter 2pcs
Axel M6x35mm 2pcs
M6 locknut 2pcs
Wheel collar 4pcs
Wheel pant 1pair
Wing tube 19 x 375mm 1pcs
Wing screw M3 x 15mm 2pcs
Aileron push rod 1.8 x 125mm 2pcs
Elevator pushrod 1.8 x 600m 1pcs
Rudder pushrod 1.8 x 600mm 1pcs
Throttle push rod 2.0 x 350mm 1pcs
The elevator joiner wing 1pcs
Push rod connector 5pcs
Control horn 4 set
Screw 1 for control horn M2 x 12mm 4pcs
Screw 2 for control horn M2 x 20mm 4pcs
Tailwheel assembly 1pcs
Servo hatch 1 pair
Screw for mounting servo hatch: self-tapping screw M2 x 10mm 12pcs
Mounting block 4pcs
CA hinges 17pcs

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Section1. Aileron Installation
Step1. Use the hobby knife to remove the covering
for the servo opening.
Step2. Place four hinges into the pre-cut slots in
the wing. Apply thin CA to the hinges. Make sure
the hinges are glued to the wing.
Step3. Slide the aileron and wing together. The gap
between the aileron and wing should be infinitely
small, approximately 1/41-inch.
Apply the thin CA to the hinges again. Make sure
the aileron is glued to the hinges.
Step4. Repeat steps 1 through 7 for remaining
aileron.
Section2. Aileron Servo & Linkage Installation
Step1. Prepare an aileron servo by installing servo
horn, grommets and brass eyelets.
Step2. Put the servo in position on the servo hatch,
and use a pen to trace outline of the servo.
(It is not necessary to position the servo horn in
the middle of the slot because the aileron only
needs a small control throw; you can move the
servo to the left a little.)
Step3. Use thin CA to glue the mounting blocks to
the servo hatch.

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Step4. Install the servo onto the servo mounting
using the screws provide with the servo.
Step5. Install the pushrod connector to the servo
horn.
Step6. Locate the aileron pushrod (1.8 x 125mm)
and connect it to the second hole on the servo
horn.
Step7. Slide the push rod through the pushrod
connector and position the control horn on the
aileron.
Use a pen to mark the mounting holes for the
control horn.
Step8. Use the M2 x 12mm socket head screws and
the control backplate to install the control horn
onto the aileron.

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Step9. With the aileron centered, tighten the screw
on the push rod connector.
Step10. Cut off the excess push rod.
Step11. Repeat steps 1 through 10 for the
remaining aileron servo.
Section3. Stabilizer and Elevator Installation
Step1. Remove the covering from the fuselage as
shown.
Step2. Slide the horizontal stabilizer into the slot in
the fuselage, with the leading edge pushed
forward in the slot. Center the stabilizer in the
opening by measuring the distance from the
fuselage to each tip. The stabilizer is aligned when
both measurements are identical.

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Step3 Check the distance from each stabilizer tip to
each wing tip. These measurements must also be
equal.
Step4 The last alignment step is making sure the
wing and stabilizer are parallel. If they are not,
lightly sand the opening in the fuselage for the
stabilizer until the stabilizer rests parallel to the
wing.
Step5 Use a pen to trace the outline of the fuselage
on the bottom and top of the stabilizer.
Step5. Remove the stabilizer from the fuselage,
and use hobby knife to remove the coverings along
the line drawn in the previous step.
Step6. Place the elevator joiner wire into the slot.

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Step7. Apply the epoxy to the exposed area on the
bottom and top of the stabilizer, slide the stabilizer
back into the slot and double-check the alignment
of the stabilizer.
Step8. Insert the hinges into the elevator and apply
thin CA to the hinges.
Step9. Test fit the elevator and stabilizer together,
Mark on the elevator where the elevator joiner
wire will be insert.
Step10. Drill the hole on the elevator for the
elevator joiner wire.
Step11. Attach the elevator to the stabilizer
through the joiner wire and CA hinges.
Apply epoxy to the groove and holes for the joiner
wire, and apply thin CA to the hinges.

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Section4. Vertical Tail and Tailwheel
Installation
Step1. Insert three CA hinges into the slots in the
rudder. Apply thin CA to the hinges.
Step2. Prepare a tailwheel assembly as shown.
Step3. Cut a groove in the leading edge of the
rudder to accommodate the landing gear wire, and
drill a hole for the vertical shaft.
Step4. Apply epoxy in the groove and the hole for
the tail gear wire, and then glue the tailwheel
assembly to the rudder.
Step5. Glue the fin into position and use a Triangle
to make sure the fin is perpendicular to the
stabilizer.
Step6. Attach the rudder to the fin, and install the
tailwheel to the fuselage using the screws provided
with the tailwheel assembly.

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Section5. Elevator and Rudder Servo
Installation
Step1. Insert the elevator pushrod and rudder
pushrod (1.8 x 600mm) into the guide tube in the
fuselage.
Step2. Install elevator and rudder servo onto the
fuselage using the screws provided with the servo.
Step3. Finish the rudder & elevator servo linkage
installation using the same methods for aileron
servos’.
Section6. Main Landing Gear Installation
Step1. Use two wheel collars to install the wheel to
the M6 x 35mm axle.
Step2. Insert the wheel into the wheel pant.
Step3. Use a M6 lock nut to attach the wheel to
the landing gear.

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Step4. Use a M2.5 x 12 self-tapping screw to
secure the wheel pant to the landing gear.
Step5 Repeat steps through 1 to 4 for the
remaining wheel.
Step6. Install the main landing gear to the fuselage
using three M4 x 16mm socket head screws.
Section7. Wing Installation
Step1. Attach the assembled wing panels to the
fuselage using the aluminum wing joiner.
Step2. Use two wing screws to secure the wing
panels to the fuselage as shown.
Step3. Attach the canopy to the fuselage.

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Section8. Motor Installation
Step1. Prepare a motor with prop adapter installed
Step2. Install the motor box onto the fuselage
using four M4 x 16mm socket head screws.
Step3. Install the motor to the motor box using
four M4 x 16mm socket head screws, f our M4
locknut and four M4 washers.
Step4. Test fit the cowling to the fuselage.
Step5. Use four M3 x 12mm screws to secure the
cowling to the fuselage.
Step6. Slide the spinner backplate onto the prop
shaft and install the prop.
Step7. Install the spinner.

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Section9
Recommended CG
For the first flights, the recommended center of
gravity location is 115mm (4-1/2inch) behind the
leading edge of the wing against the fuselage.
Recommended control throws
1. Low/Precision Rates and corresponding
exponential
Aileron 20 degree up/down Expo: 40%
Elevator 20 degree up/down Expo: 25%
Rudder 30 degree left/right Expo: 30%
2. High/3D Rates and corresponding
exponential
Aileron 45 degree up/down Expo: 80%
Elevator 60 degree up/down Expo: 80%
Rudder 50 degree left/right Expo: 60%
Note that Futaba and Hitec radios require
NEGATIVE exponential, while JR and
Spektrum use positive exponential.
Range test your radio
Step1. Before fly, be sure to range check your radio
as manufacturer’s instruction manual of your
radios
Step2. Double-check all controls (aileron, elevator,
rudder and throttle) move in the correct direction.
Step3. Be sure that your LiPO battery is fully
charged.

2016-07-11