Depron Bug Airframe Kit – V2

(Build Instructions)

Your kit contains the following components Fittings: Carbon rods, undercarriage, wheels, control linkages, screws, motor and gearbox, propeller.

Pre-cut airframe parts (2 sheets)

Features Wingspan: 370mm

Length: 35cm Flying Weight: 25grams Channels: 3 (Throttle, Elevator and Rudder)

Suggested Receiver: 3 Ch Brick Motor: 7mm Geardrive with 140mm prop

Kit Contents

* 3mm Depron Airframe – pre cut

* Fittings (Bracing, undercarriage, control linkages) * 7 mm Geardrive * 140mm propeller

Needed to Complete

* Receiver and Transmitter

* Battery and charger

* Glue, hinge tape and basic workshop tools

All the parts are pre-cut and some tabs have

been left in to hold the parts in the sheets.

Using a hobby knife, carefully cut through the tabs to remove the parts.

First, insert the front part of the wing support

through the slot in the horizontal fuselage section

Slide the horizontal fuselage section over the

front of the wing support and push it back into the crevasse as far as it to go.

For the moment just allow the horizontal fuselage section to run alongside the fin like this.

Then push the back part of the horizontal fuselage section down over the rear part of the

wing support.

Slide the whole horizontal fuselage section

forward as far as it will go.

Then lift up the rear part of the horizontal fuselage section and slot it down over the fin and work it down gently.

Work the whole horizontal fuselage section

backward bit by bit until the rear slot fits neatly into the slot in the fin.

Glue the horizontal fuselage section in place with UHU Expanded Polystyrene Glue or other foam safe glue.

(Product Link) Next take the wing parts and sand the upper surface of both around the edge to form a

smooth rounded leading and trailing edge.

Insert the wings carefully, bit by bit into the wing shapers until they protrude about 2 cm.

Optional Step: You can now insert the wings (with the shapers

still on) into hot water to form the Depron to the

shape of the curves.

Briefly sand the inner parts which will be joined

at about 10 degrees before gluing them so they fit together flush.

Glue the wings with the shapers in place and

allow the glue to dry before removing the shapers.

The completed wing should have dihedral and

curvature.

The tailplane attached. Remember to also glue the tailplane to the horizontal fuselage section for added strength.

Both the tailplane and vertical stabiliser control

surfaces are attached by a small section. Cut through this section to remove the control surfaces.

These control surfaces will need to be cut or sanded at an angle as shown here to allow them

to pivot freely.

Control Surface Tailplane

Hinge Tape

Remove the wooden parts from the sheet. Use a hobby knife to cut around the parts to make them easier to remove.

Glue the motor mount in place remembering the R goes on the right hand side of the fuselage. The motor mount holes are positioned to give a

small amount of right thrust to the motor.

Before gluing the undercarriage mount in place screw in the three positioning screws in place

which hold the wire frame in place. Check the

undercarriage is firm.

Then glue the undercarriage in place.

Glue in place the triangular support pieces as

shown here.

Mount the motor on the motor mount with the

supplied screws. Put the supplied spacers under the rear of the motor mount as shown here to give the motor

down-thrust. NOTE: Spacers included in the kit are clear plastic – not red in colour as shown in the image here.

You may wish to solder your connector (not supplied with kit) to the motor leads before mounting it on the airframe.

The motor mount has pre-cut holes which accommodate 5320 servos. If you are using a

receiver and servo setup (not included with kit) you can screw the servos in place. Cut holes as needed in the airframe to route the servo wires

back to the receiver.

(Product Link)

This micro receiver mounts nicely between the servos.

(Product link)

If you are using a brick style receiver, (not included with kit) it can be mounted directly on

top of the motor mount board.

(MicronWings Receivers Link)

Attach your control surfaces with hinge tape and

ensure there is about ½ mm gap between the stabilizer surface and the control surface to allow for full movement.

(Product link)

Next, glue in place the control horns and connect up the pushrods.

Before doing this step be sure to turn on your transmitter and receiver and centre the servo arms and trims on the transmitter.

Also check which side your control horns need to go on if using a brick style receiver. You may

also need to reverse direction of rudder or

elevator on your transmitter.

Attach only this control linkage to the ends of the two control rods. Use a dab of glue to tack them in place and cut a short length of heat shrink from the tube to

cover them with. The glue is important because when the heat shrink is heated the glue heats up and binds the pushrod and heat shrink together. Heat the heat

shrink with a soldering iron or something else hot. These connectors are for the ends of the pushrods which attach to the servos.

Example of the pushrods connected to the servos. Attach the control linkages to the inner most hole of the servo (if using servos). This will reduce the over travel of the pushrod to a more appropriate amount.

Once again turn on your transmitter and check your servos are cantered.

Use a piece of stiff masking tape or a pin to keep the control surface level and then trim the pushrod with plier cutters about 5mm from the control horn.

Attach the control linkage with the hoop in it, add a little glue and heat to shrink the heat shrink to bond the join.

Attach the control linkage to the hole further most away from the control surface.

Be sure to check that the control surface is level.

Adjust your maximum servo travel for the rudder on

your transmitter. This image shows the maximum amount of throw needed. You will most likely need to dial down the maximum servo travel in the settings on

your transmitter.

Use a section of heat shrink 3mm long and heat it to shrink it to the axel to keep the wheels on.

To attach the propeller, don’t press it onto the shaft by holding the geardrive as this will most likely result in a bent shaft. Instead, lay the propeller on a bench and grip the

geardrive shaft with a pair of fine tip pliers. Press the shaft down into the propeller.

Next glue on the wings. If using UHU Expanded

Polystyrene glue, apply a small amount to both surfaces and allow to dry till very tacky before bringing the two surfaces together.

Check the wings are level.

Use some modelling tape to pull the front and back down onto the pylon where the wings attach.

Glue in place the two ribs next to the fuselage. These will help to keep the wings level and add strength to

the mount. Again tape the ribs in place till they dry.

Put a small amount of glue onto the back of the screws protruding through the undercarriage mount and screw on the soft rubber tubes. This will protect from scratched from the screw tips.

Attach the VELCRO® Brand Super Fine Dots to the fuselage where the battery need to be attached.

This image shows the approximate position of the battery. But this may vary depending on your receiver

choice and servo setup.

Centre of Balance. Adjust the position of the battery so the balance point is 30mm back from the leading edge of the wing.

Finished.

Check control surfaces before flight. You only need a slight amount of throw on the control surfaces. In most cases you will need to dial down the throws on the control surfaces. Do a test glide first over grass to check the balance point. Start out with low throttle and hand launch. Try a gentle turn left and right and land ahead and adjust servo travel if needed.

Sample Flight Video

https://youtu.be/hEfyqlDqBsc

Copyright © MicronWings 2017: All rights reserved.

This manual is for personal use only. No unauthorized copying or digital distributing permitted.

30mm