H-KING J3 Navy Cub User manual

INSTRUCTIONS

CONTENTS
Introduction 1
Features 1
Specification 1
Contents 2
Tools And Items 3
Assembly of the front landing gears 4
Assembly of horizontal tail & 5
vertical tail and tail wheel
Assembly of main wings, 6-7
front landing gear and propeller
Centre of Gravity 7
Pre-Flight Check 8
Flight 8-9
Tips 9
Problem Solving 10
Notes 11

Thank youfor purchasingH-king’s Piper J3 Navy CubElectric R\C airplane, the Piper J3 is a
propeller airplanewhich is ideal for thebeginners, seasoned flyer’s and scale enthusiasts.
TheNavy cubwillperform most aerobatic manoeuvres from loops to stallturns and low slow fly by’s
is the best thingabout flyingtheNavy Cub. Made from tough EPO foam means it willhandle allthe
bumps and repairingany damageis a breeze. In order to fly thePiper J3 please make sure you
read through theinstructions carefully before attemptingto operate themodel for thefirst time.
You alone are responsible for the safe operation of your radio-controlled model. Young people should
only be permitted to operate this model under theinstructionand supervisionof an adult who is
aware of the hazards involved in this activity.
FEATURES:
- Authentic Scale scheme. (Thank youJB)
- Perfect aerobatic manoeuvres, such as
rolls,loops, and stallturns.
- Stable inverted flight.
- Excellent scale performance.
- Excellent stability in pitch.
- Controllable landings andeasy to fly.
- Modular design, easy to replace the
spare parts.
- Wingspan (approx): 1400mm (55”)
-Length: 950 mm
- Flying weight: 1800g
- Wing load: 56 g/dm²
-45A ESC, Powerful 3648 Brushless out-
runner motor with 700kv
- 4 x 9g servos
- Battery: 2200mHa 3~4S LiPo Battery
SPECIFICATION:
INTRODUCTION
1

CONTENTS
1. Cowl
2.
Fuselage
3.
Main Wing
4.
Horizontal Wing
5. Landing gear set
6. Vertical Wing
7. Propeller
8. Wing Rod
9. Prop Adaptor
10. Motor
11. Spare Parts
12. ABS plastic wing
support
13. Inclined strut
8
9
10
11
12
13
1
2
3
4
5
6
7
2

TOOLS AND ITEMS:
3
To assemble this airplane you will require the following tools.
Modelling Knife
Pliers
Cross Head Screwdriver Side Cutters
Set Square
Scissors

ASSEMBLY OF THE MAIN LANDING GEAR:
4
Glue the steel wire to Glue the front landing gear wire to the rear.
the landing gear fairings
Glue the gears parts
together as shown.
Aach the springs to the landing gear anduse heatshrink to cover the springs.
Slide the wheel onto the steel wire and ensure
the wheel rotates easily on the axle.
Screw the wheel chock through the wheel onto
the steel axle in a clockwise direcon.
The landing gear assembly
is now complete.
1
2
3
4
5
6
7

5
Install the rudder plate into
the vercal tail.
Install the control horn to the
elevator using the 1.7X15mm
screws provided.
Install the control hornto
the rudder using the
1.7x15mm screws provided.
Install the horizontal tail onto the fuselage with screw the 2 off M3x30mm screws provided.
4
Install the vercal tail using the M3x45mm and the M3x40mm screw provided.
5
Connect the rudder pushrod to the tailwheel control arm as
shown.
8
1
2
3
Assemble the tailwheel parts using a medium CA glue.Install the tailwheel assembly using
the 2.6x8mm screws provided.
6
7
ASSEMBLY OF HORIZONTAL TAIL, VERTICAL TAIL & TAIL WHEEL:
Set the elevator at neutral
and connect the pushrod.

6
ASSEMBLY OF MAIN WINGS, FRONT LANDING GEAR AND PROPELLER:
Install the aileron control horns using the 1.7x15mm screws provided. Then
attach the aileron pushrods to the 2nd hole in the servo output arms and
connect to the control horns.
Slide the wing joining rod into both wings then secure with the screws provided.
Connect the aileron servo leads to the Y lead. Install the main wing onto the cabin top with the 2
off M3x35mm screws provided. The Y lead should be fed into the cockpit area,
Attach the 2 wing strut
assemblies using the screws
provided.
Attach the main landing
gear with the supplied
screws.
1
2
3
4
5
6
7
8

7
CENTER OF GRAVITY
Attach the tailplane bracing struts using the supplied 2.6x20mm screws.
Slide the propeller onto the motor shaft, then the washer and finally screw on the
domed threaded spinner using a tommy bar.
1. Check wings and control surfaces for alignment and damage. Check allconnections to the
control surfaces, check allscrews and glue joints.
2. Check thepropeller, adaptor and undercarriage.
3. Check theH-King Navy Cub’s Centre of Gravity. (CoG)
4. Always turn your transmitter on before poweringup your RC plane.
9
10
PRE-FLIGHT CHECK
C of G is 65mm from
the wing leading edge.

8
FLIGHT
5. Switch thetransmitter on, then switch thereceiver on.
6. Always perform a range check with your transmitter. Make sure your plane is secure to prevent
damage to people andproperty.
7. Check plane responds properly to control inputs.
8. Re-check allyour control surfaces, airframe, screws andundercarriage etc.
9. If there is no interference on the RC controls then the plane is ready to fly.
Take-off:
1. Place the model into wind and hold in some elevator, slowly increase thethrottle, use therudder to
keeptheCub flying straight. Slowly ease off some of the elevator and let the tail of the Cub rise
slightly until it is running on the main wheels only, a small touch of up elevator will see the Cub
become airborne.
2. Try and fly straight into wind gaining height,once at height and you are comfortable with theflying
attitude of your plane then adjust the trims for hands off flying. If trimmed correctly the Cub should
fly straight and level at about 50% throttle.
3. Be careful not to over control theplane, just keep the turns gentle and steady and fly at a safe
height as you get used to the Cub's flying characteristics.As you get used to it you should start to
make gentle circular climbs. As you become more familiar with your H-King Navy Cub and your flying
confidence develops themore manoeuvres youcantry and perform.
Flight:
1. Theplane should fly level at around 50% throttle.
2. Theflight time will be prolonged if youare economic with the power, the Cub does not want
to be flown about at full throttle all the time.
Landing:
Now your first flight is coming to an end, it’s time to land. Make sure you do a practice approach. After
this approach start your landingpattern beginningwith a downwind leg, reducingthrottle to slow the
Cub to a suitable speed. Turn onto your base leg part of thecircuit, use your rudder elevator and
ailerons to fly a co-ordinatedturn. Turn onto final approach keep flyingtheCub straight using the
rudder to adjust yaw control, theelevator controls your attitude and thethrottle controls your altitude.
Usingthis method, theCub is easy to control. Slowly decrease throttle and slowly fly theCub onto
its main landinggear, whenthe Cub settles cut thethrottle and slowly apply some up elevator.

TIPS
9
this keeps the tailwheel on the ground.Youhave now finished your first flight. Taxi your plane back
holding in full up elevator and steering with the rudder. Once back in the pit area safely remove the
flight battery and switch off your transmitter.
1. Train yourself with an RC flight model simulator before youfly theH-King J3 Navy Cub electric RC
airplane. It will help youwith coordinationfor whenfly your model.
2. Taxi theJ3 Navy Cubon theground to learn how to control the directionof theplane.
Please remember when theplane flies towards to youtheaileron andrudder control directionis
reversed.
3. Fly with theassistance of an experiencedpilot if this is your first flight with this type of model.
4. Do not fly in strong windsor inclement weather.
5. Always head into windwhen takingoff and landing.
6. Do not fly theplane above or behind you, this canlead to disorientation, always fly theplane in front
of theflight line and never behind.
7. Please consider purchasinga spare battery pack for longer flights.
8. Do not fly this plane with damaged or brokenparts this may result in accidents or injury. Spare parts
are available via our website.
Phenomenon Typical error Problem solving
Motor does
not run
1. The battery is not full charged
2. The battery of thetransmitter
islow on power.
3. Something is disconnected in
the plane
1. Charge thebattery
2. Replace the battery in the
transmitter.
3. Check motor,ESC
connections.
PROBLEM SOLVING:

10
||Motor runs
backwards 1. Motor/ESC connection error
1. Swap around any 2 of
the 3 ESC/motor wire
connections
Servos not
operating
properly
1. The servo leads are connected
to the Rx incorrectly.
2. The servo is damaged.
1. Make sure the servo leads
are connected properly.
2. Replace servo.
Difficult to trim
1. Control surfaces not centered.
2. CoG is not in the correct
position.
1. Adjust thetrims on the
transmitter.
2. Re-position the battery
suggested.

11