HobbyKing DragonFly EDF Assembly Manual

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Assembly manual
Intended for use by intermediate fliers.
Some build experience is required.
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)
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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
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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
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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.
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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.
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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.
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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 6­7mm 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
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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 pin
Eyehook
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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 Y­harnesses 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.
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