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Always choose a wide-open space for flying your plane. 
It is ideal for you to fly at a sanctioned flying field. If you 
are not flying at an approved site, always avoid flying near
houses, trees, wires and buildings. You should also be 
careful to avoid flying in areas where there are many 
people, such as busy parks, schoolyards, or soccer fields. 
Consult laws and ordinances before choosing a location 
to fly your aircraft. After takeoff, gain some altitude. Climb 
to a safe altitude and begin to trim the model till it’s tracks 
well through all aspects of flight, including high speed 
passes, inverted flight, loops, and point rolls. 

1. Land the model when you hear the motor pulsing (LVC) 
or if you notice a reduction in power. If using a transmitter 
with a timer, set the timer so you have enough flight time to
make several landing approaches.

2. Recharge the battery and repair the model as needed. 
The model’s three point landing gear allows the model to 
land on hard surfaces. Align model directly into the wind 
and fly down to the ground. Fly the airplane down to the 
ground using 1/4-1/3 throttle to keep enough energy 
for proper flare. Before the model touches down, always 
fully decrease the throttle to avoid damaging the propeller 
or other components. The key to a great landing is to 
manage the power and elevator all the way to the ground 
and set down lightly on the main landing gear. After a few 
flights you will find the model can be set down lightly on 
the mains and you can hold the tail wheel off balancing the 
model on the mains till it slows and gently settles the tail.

Repairs to the foam should be made with foam safe
adhesives such as hot glue, foam safe CA, and 5 min 
epoxy. When parts are not repairable, see the Spare Parts 
List for ordering by item number. Always check to make 
sure all screws on the aircraft are tightened.  

As a precaution, an operational ground range test 
should be performed before the first flight each time 
you go out. Performing a range test is a good way to 
detect problems that could cause loss of control such 
as low batteries, defective or damaged radio 
components, or radio interference.  This usually 
requires an assistant and should be done at the actual 
flying site you will be using.

First turn on the transmitter, then install a fully-charged 
battery into the fuselage. Connect the battery and
install the hatch.

Remember, use care not to bump the throttle stick, 
otherwise, the propeller will turn and possibly cause 
damage or injury.  

Note:

 Please refer to your 

Transmitter Manual

 that 

came with your radio control system to perform a 
ground range check. If the controls are not working 
correctly or if anything seems wrong, do not fly the 
model until you correct the problem.  Make certain 
all the servo wires are securely connected to the 
receiver and the transmitter batteries have a good 
connection.

Find a flying site clear of buildings, trees, power lines 
and other obstructions. Until you know how much area 
will be required and have mastered flying your plane 
in confined spaces, choose a site which is at least the 
size of two to three football fields – a flying field 
specifically for R/C planes is best. Never fly near 
people– especially children who can wander 
unpredictably. 

Monitor and limit your flight time using a timer (such a
s one on a wrist watch or in your transmitter if available). 
When the batteries are getting low you will usually 
notice a performance drop before the ESC cuts off 
motor power, so when the plane starts flying slower 
you should land. Often (but not always) power can be 
briefly restored after the motor cuts off by holding the 
throttle stick all the way down for a few seconds.

To avoid an unexpected dead-stick landing on your f
irst flight, set your timer to a conservative 4 minutes. 
When your alarm sounds you should land right away.
When you learn how much flight time you are getting
you can adjust your timer accordingly.

Find a suitable flying site

Perform a range  check

Monitor your flight time

Take

 

off

Until you have become comfortable with  flying your

Arcus

 , do not fly if the wind speed is greater than

10mph.

One final  check before takeoff: always double-check the 
flight control response to your inputs from the transmitter 
before every flight. Be sure the ailerons, elevator and 
rudder respond correctly and that none of the controls 
have inadvertently become reversed.

And make sure the spinner and the propeller are firmly 
in place before every flight.

Place the model on your “runway” with the nose pointing 
into the wind-this will reduce the speed that must be 
reached and automatically provide the assist for the 
take off, make the takeoff and steering  easier. Slowly 
advance the throttle, adding rudder correction as needed 
to keep the model rolling straight. When the plane becomes  
light continue to apply throttle until you are at full-power, all 
this will happen in a few seconds. When sufficient liftoff 
speed has been reached gradually and slowly apply 
up elevator, allowing the model to leave the ground. 

Flying

Landing

Note: 

If during a rough landing, the propeller become 

stuck  and cannot rotate,  the battery and the ESC will 
become very hot. Immediately move the throttle down 
to  cease the power input,  if you fail to do so, the motor
or the ESC may be damaged.

After flight

12

Summary of Contents for Arcus F3A

Page 1: ... Loading 30 0g sq dm Motor Size 3536 KV900 Radio 4 channel radio system Required Servos 4 9g servos CG center of gravity 3 3 4 to 4 in 95 100mm back from the leading edge of the top wing Prop Size 11x7 electric propeller Speed Control 40 amp brushless Recommended Battery 11 1V 3S 2200 mAh LiPo Required Instruction Manual ...

Page 2: ...s may differ slightly from the photos In those instances the written instructions should be considered as correct 3 If you are not an experienced pilot or have not flown this type of model before we recommend that you get the assistance of an experienced pilot in your R C club for your first flights If you re not a member of a club your local hobby shop has information about clubs in your area who...

Page 3: ...if you need assistance with assembly contact HK Product Support Team When reporting defective or missing parts use the part name exactly as they are written in the KIT CONTENTS list REPLACEMENT PARTS LIST Order No Description KIT CONTENTS 1 2 4 5 6 7 8 9 10 3 1 Top wing 2 Lower wing 3 Fuselage With the spinner 4 Horizontal stabilizer 5 Main landing gear 6 Propeller 7 Interplane struts 8 Screw set ...

Page 4: ... charge through the charge lead NEVER charge through the discharge lead NEVER charge at currents greater than 1C ALWAYS set charger s output volts to match battery volts ALWAYS charge in a fireproof location NEVER trickle charge NEVER allow the battery temperature to exceed 150 F 65 C NEVER disassemble or modify pack wiring in any way or puncture cells NEVER discharge below 3 0V per cell NEVER plac...

Page 5: ... the horn to the rudder using foam safe glue 4 Glue in the magnets for the cowling and battery hatch 5 Before installation of the motor and propeller connect the ESC to the motor 6 Attach the sheet metal to the battery hatch and put the hatch into place 4 ...

Page 6: ...e screw mounting holes and let cure to strengthen the plywood before mounting the servos into place 2 Install the control surface horns to the lower wings using Epoxy and mount the aileron servos in the servo bays using Epoxy 4 Install the strut mounting bases the swivel ball mounting plates and the wing mounting washers to the top wing using Epoxy 3 Install the lower wing mounting nose using Epox...

Page 7: ...assembly 1 Put together the wheel pants clips using CA Secure the gear axles with the nylon nuts provided and fit the wheels into the wheel pants and the wheel pants to the clips Put the wheel assembly onto the axles align the wheel pants and secure them by using four wood screws on each side on the inside of the strut Put a washer on each axle in between the pants and the wheel before securing th...

Page 8: ...elevator connector is properly in place on both halves before fully inserting the stabilizer into place 1 Snap the horizontal stabilizer into place by inserting the right stabilizer half into the mounting slot first Make sure to slide it all the way to the front and bottom of the slot Install the horizontal stabilizer 1 To install the aileron control rods insert the Z bend of the respective rod in...

Page 9: ...ing bay Secure the wing using two wood screws 3 To install the interplane struts use the strut with the Arcus logo on the right side and the strut with the H KING logo on the left side Use 4 wood screws provided for each strut to attach them to both wings 2 Note You can wiggle the wing several times to make sure the wing is properly fitted into place Install the top wing by keying the screw mounti...

Page 10: ...the control system testing Caution To prevent personal injury do not install the propeller onto the motor shaft in the process to bind your RX to your TX and to test all the control channels until the manual tell you to do it 2 Move the sticks on the transmitter to make sure all of the surfaces are moving in right direction please refer the following pictures If the control surfaces deflect in the...

Page 11: ...he second four beeps 4 Battery selection and configuration We recommend the 11 1V 1P 25C 2200mAh to 2600mAh 180g 240g Lipo battery If using another battery the battery must be at least a 11 1V 1P 25C 2200mAh to 2600mAh battery your battery should be approximately the same capacity weight and can even fit into the Arcus battery hatch 1 Mechanically adjust the linkage rod to align the surface with t...

Page 12: ...too far aft tail heavy the model will be too responsive and difficult to control If the C G is too far forward nose heavy the model will be too stable and not responsive enough Follow the instructions to make sure the model is balanced properly and the C G is in the correct location 1 The recommended C G location for your model is from the most leading edge of the top wing as the picture shows whi...

Page 13: ...h your radio control system to perform a ground range check If the controls are not working correctly or if anything seems wrong do not fly the model until you correct the problem Make certain all the servo wires are securely connected to the receiver and the transmitter batteries have a good connection Find a flying site clear of buildings trees power lines and other obstructions Until you know h...

Page 14: ...Power loss to receiver Aircraft will not respond to the throttle but responds to other controls ESC is not armed Throttle channel is reversed Lower throttle stick and throttle trim to lowest settings Reverse throttle channel on transmitter Replace damaged parts Tighten parts for propeller adapter propeller and spinner Remove and install propeller correctly Completely recharge flight battery Replac...

Page 15: ...MADE IN CHINA ...

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