Hobby King DragonFly EDF User manual

Assembly manual

Intended for use by intermediate fliers.

Some build experience is required.

Specifications:

Meterial: Plywood and film covered balsa.

Wingspan: 920MM.

Length: 830MM

Flying weight: 800-900g

Motor: 2830-3600kV (Included)

EDF: 68mm (Included)

ESC: 40A (Required)

Servo: 5x9g (Required – MG90S is recommended)

Battery: 2200 mah 3S (Required)

Radio system: 4+ channel (Required)

Included in the box:

Parts included in your kit:

!Fuselage and canopy

!Main wings x2

!Horizontal stab

!Rudder

!EDF and motor (not shown)

!Motor mount add-ons x2

!Landing gear (wheels and

struts)

!Pushrods x5

!Long and short CF rod/pins

!Additional hardware (screws,

clevises, horns etc.)

!Fiberglass fin

Equipment required (not included):

!4+ channel radio and receiver

!5x9g servos

!30-50A ESC

!Battery (2200mah 3S1P is

recommended)

!Strong epoxy (15-30 min) and

strong CA glue

!Velcro

!30cm servo extension wires x2

!2mm drill bit

!Small screwdrivers and Allen

(hex) keys

!Craft knife

Step 1: Main wing preparation

Glue the ailerons and aileron hinges in

place. To do so, use medium viscosity CA

glue to glue the hinges in the main wings

such that half of each hinge remains

exposed. Place a drop of CA on the tip of

each hinge and slide the ailerons in place.

Ensure that the aileron moves freely.

Repeat for both sides.

Remove the covering film over the servo

bay on the underside of the wing if not

already done so.

Step 2: Main wing servo and pushrod installation

Take a 9g servo, centre it using your radio

and attach a servo horn in the correct

position. Cut away the covering film from

the slot for the servo arm.

Attach the servo to the underside of the

servo bay covers either by gluing the servo

directly in place or by gluing small wooden

blocks in the appropriate locations with CA

glue and screwing the servo to these. Do

not forget to drill 1.5mm pilot holes into the

wooden blocks before screwing into them.

Attach 30cm servo extension leads to the

servo and route these through the main

wings to the exit provided. Attach control

horns to the ailerons on the underside of

the wing using small woodscrews as

shown to the right. Complete the pushrod

and linkage assembly and secure the

servo and cover to the main wing with a

woodscrew in each corner.

Remove covering

film here if not

already done

Glue aileron

hinges in

place

Step 3: Tail assembly and pushrod install

The rudder pushrod is run through the

fuselage to the rudder, while the elevator

pushrod is run through a flexible plastic

sleeve to the top of the vertical stab.

Begin by securing the rudder and hinges

to the vertical stab and the elevator and

hinges to the horizontal stab using the

same procedure as before. Next, install

the rudder servo, pushrod and control

horn. You will have to punch a small hole

in the covering film to allow the rudder

pushrod to pass through. Attach a plastic

control horn to the z bend of the rudder

control horn (the second longest pushrod

supplied in your kit) and slide it into

place as depicted in the uppermost

image to the right. Secure the control

horn to the rudder.

Next, route the elevator pushrod through

its plastic sleeve from the top of the

vertical stab through to the fuselage.

Glue the horizontal stab in place as

shown using 30 minute epoxy. Allow to

fully cure before continuing. Note that

this joint is keyed by design in order to

maximize bond strength. You will need to

cut a small amount of covering film away

from the horizontal stab in the relevant

locations, referring to the images

provided.

Glue the wooden piece seen in the third

image to the right in place. Also add a

control horn to the elevator as per this

image and set up the linkage in the

correct manner. Finally, trim the

fiberglass fin to the correct size and glue

to the tail as per the final image to the

right.

Secure in position using two wood

screws thread-locked with a drop

of CA each. Note that this image

shows the RHS of the aircraft.

Step 4: Rudder and elevator servo install

Installing these servos is relatively

straightforward as depicted in the image

to the right. Simply attach both servos in

place as shown using two woodscrews

each. Note that higher torque servos are

required here (MG90S will suffice). Drill

2mm pilot holes before securing. Attach

each pushrod to the appropriate servo

horn using a small metal clevis and

secure with a hex screw. After you have

confirmed the correct operation of each

servo and control surface, trim the

excess length off each pushrod.

Step 5: Main landing gear install

The main landing gear struts are

glued/screwed directly to the underside

of the main wings. Locate the reinforced

area in which these sit and cut a small

grove in the plywood into which the strut

will sit using a craft knife. Drill a 3mm

hole at the end of the grove closest to

the fuselage at 10mm depth. Secure the

strut in place with 30-minute epoxy and a

plastic strap. Finally, add a wheel and a

collar to the strut. Repeat for both sides.

Step 6: Nose landing gear install

Begin by assembling the nose landing

gear strut, wheel and collars as per the

image to the right.

Next, glue the wooden piece shown in

the image to the right in place. Use

strong CA glue or epoxy to secure.

Install the nose landing gear strut in

position.

Secure with the included control arm and

hex screw. Attach a pushrod and metal

clevis.

Install the nose landing gear servo in the

provided servo mount. Make sure to

mount the servo as far away from the

centerline of the fuselage as possible to

avoid the pushrod interfering with the

battery pack.

Step 7: EDF install

The position of the EDF in the DragonFly is

unique and makes your aircraft quite

efficient for an EDF model. To begin the EDF

install, assemble your motor and fan unit in

the usual manner. Make sure that the collet

is fully secure on the motor shaft and that

the rotor runs true and balanced. Also route

the motor wires through the side of the EDF

unit as depicted. You will need to drill a 6-

7mm hole in the wall of the EDF housing to

accomplish this. Once you have fed the

three motor wires through this hole, solder a

male bullet onto each.

Secure the EDF unit to the fuselage using

four short wood screws. For added

efficiency, add the EDF inlet shroud should

be glued in place using a few drops of CA

glue.

Next, attach the plywood motor mounts

using strong CA glue or epoxy as shown.

Remove a portion of the fuselage as

depicted on the right to allow passage of the

ESC/motor wires. Connect your ESC and

ensure that your fan rotates in the correct

direction. Tidy up the cables, perhaps using

small cable ties.

Add EDF

shroud

Step 8: Main wing installation

First, add the small CF locator pins and

eyehooks to the main wings. Use CA

glue to secure the locator pins in place.

Remove the covering film from the

fuselage in the following locations.

Slide the large CF rod into one of the

main wings and slide that wing in place

onto the fuselage. Slide on the other

main wing and secure one to the other

using the rubber o-ring as shown. You

may need to adjust the eyelets to

achieve the correct tension in the rubber

band.

Locator

Eyehook

Step 9: Finishing touches, CG and throws

Install your electronics in the usual

manner. If you have a 4 channel radio

you will need to install 2 servo Y-

harnesses to combine the two aileron

servos and the rudder and nose wheel

servos.

The location for the CG is shown to the

right. Adjust the location of the battery

such that the CG lies between 53 and

58mm behind the leading edge of the

main wings, as measured at the

fuselage.

The control throws should be +/- 6mm for

the ailerons and elevators and +/- 10mm

for the rudder. If you are using dual

rates, add and subtract 1.5mm on these

values for high and low rates

respectively.

Important:

!Pre-flight adjustment and trimming must be done before flying. Check that all

linkages, nuts, servo horns, linkage nuts and screws are tightened.

!Ensure the flying field is spacious and safe to fly. Bench test the electronic power

system on load for 1 minute.

!Check all electronic equipment. Range-check the radio equipment. Test all control

surface are moving in their assigned directions before each flight.

!Check the battery voltage before use, even the batteries are recently charged.

!After the first flight, it is prudent to check the CG for all subsequent flights.

Table of contents

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