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3. Cut the inner pushrod tube to the correct length, then

install the last 1" threaded stud with a clevis. Position the
steering arm as shown in the photo. Adjust the length of
the pushrod so that when the rudder is neutral and the
pushrod is connected to the steering arm, the nose wheel
is also neutral.

4. Turn the model over and confirm the coordination of

the rudder and the nose wheel – when the rudder moves
left, the nose wheel should turn left. 

1. Apply a thin film of aliphatic resin (white glue such as

Great Planes Pro) or epoxy to one of the wing tips and the
root of one of the wing extensions then join the two pieces
by clamping them together with T-pins and masking tape.
Hint: Stick the T-pins in first as they will keep the root
extension from shifting while you apply the masking tape.
Place a straightedge on the bottom of the wing across the
wing and the wing extension to make sure you have not
inadvertently built in some dihedral or anhedral to the tip of
the wing.

2. Glue the other wing extension the other wing tip in the

same manner. Allow the glue to fully dry before proceeding.

3. Use a hobby knife or a MultiPro to cut the hole in the

plastic wing shield for the aileron servo. True the sides of the
wing shield with a bar sander and 220-grit sandpaper.

4. Place the wing shield on the wing and aligning the

hole in the shield with the hole in the wing for the aileron
servo. Use a felt-tip pen to mark the edges of the wing
shield onto the trailing edge of the wing.

5. Cut the 1/4" x 5/16" x 24" balsa wing trailing edges so

they fit between the marks you made and the tip of the
wing. Use epoxy or aliphatic resin to glue the trailing edges
to the wing and hold them in position with masking tape
until the glue dries. 

Note: 

The 1/4" side of the trailing edges is the side that

gets glued to the wing.

6. Use a sanding block to sand the ends of the balsa

trailing edges so they are flush with the wing tips.

7. Optional: Trace the outline of both wing tips onto a

1/8" balsa sheet (not included), then cut the wing tips from
the sheet and glue them to the tips of the wing. After the
glue dries use a sanding block and 220-grit sandpaper to
shape the balsa tips to match the contour of the wing. The
1/8" balsa will add a little durability by protecting the wing
tips from dents and dings.

Assemble the Ailerons

Build The Wing

9

Summary of Contents for Trainer 40

Page 1: ...ired High performance Fuselage Length 44 in 1117 6 mm 2 stroke 40 to 46 cu in 6 5 7 5 cc or Radio Required 4 Channel with 4 servos 4 stroke 48 to 51 cu in 7 86cc READ THROUGH THIS INSTRUCTION MANUAL BEFORE BEGINNING ASSEMBLY IT CONTAINS IMPORTANT INSTRUCTIONS AND WARNINGS CONCERNING THE ASSEMBLY AND OPERATION OF THIS MODEL ENTIRE CONTENTS Copyright 2003 Printed in USA DT40P03 for DURA1111 v1 1 ...

Page 2: ...n In no case shall DuraPlane s liability exceed the original cost of the purchased kit DuraPlane reserves the right to change or modify this warranty without notice This instruction manual provides step by step instructions for assembling the Trainer 40 kit Assembly of the Trainer 40 consists of eight major steps and must be completed in the following order BUILD THE TAIL FEATHERS Page 3 ASSEMBLE ...

Page 3: ...e rudder Use the control horn as a template to drill two 1 16 holes for the 2 56 x 1 2 screws Push the screws through the control horn Then thread them into the Control Horn Back Plate until it is snug 3 Mark the locations of the Hinges on the rudder and fin as shown in the photo above 4 Use a hobby knife with a 11 blade to cut the hinge slots Tip Carefully move the blade back and forth to enlarge...

Page 4: ...2 56 x 1 2 screws and the back plate 1 Drill two 1 8 holes through both sides of the rear of the Aluminum Fuselage Channel at the locations shown in the photo the rear is the end with the two pre drilled smaller holes in the bottom that are closer together Insert the fin in the fuselage channel so that the trailing edge is aligned with the aft edge of the channel Mark the location of the holes in ...

Page 5: ...ight side of the mount is close enough Enlarge this hole with a 3 16 drill all the way through the mount If you decide to drill the hole in a different location make sure the throttle pushrod will not interfere with the fuel tank 3 Place the engine on the mount then mark the location of the engine mounting holes Drill 7 64 holes for mounting the engine with 6 x 3 4 screws and washers not included ...

Page 6: ...block to round a bottom corner of each landing gear plate so it will fit the curve inside the fuselage The bottom of the plates is the side with the line you drew Place one of the landing gear plates inside the fuselage so the line is visible through one of the holes you drilled then mark the location of the hole on the landing gear plate Drill a 7 64 hole at the mark Position mark then drill a 7 ...

Page 7: ...way and the recommended way is to make a receiver plate from a piece of 1 8 lite ply and a piece of 3 4 wide balsa not supplied Glue the receiver plate the approximate size of the base of the receiver to the balsa block then fit the block in the fuselage channel like you did the servos Mount the receiver to the plate with 1 4 of foam in between the receiver and the plate Make sure this arrangement...

Page 8: ...where to cut the outer guide tube and the throttle pushrod Cut the tube and pushrod then disconnect the clevis from the carburetor and thread the stud into the throttle pushrod 4 Now that the pushrods are connected and the exact location of the servos is determined attach the servos securely to the aluminum fuselage Wrap two layers of reinforced filament tape around the servos and the fuse channel...

Page 9: ... to fully dry before proceeding 3 Use a hobby knife or a MultiPro to cut the hole in the plastic wing shield for the aileron servo True the sides of the wing shield with a bar sander and 220 grit sandpaper 4 Place the wing shield on the wing and aligning the hole in the shield with the hole in the wing for the aileron servo Use a felt tip pen to mark the edges of the wing shield onto the trailing ...

Page 10: ...rvo into the wing then drill two 1 16 holes in both servo mounts for the servo screws included with your radio system Mount the servo to the servo mounts 3 Thread a clevis about 20 turns onto a 12 wire pushrod then cut 4 off the other end Connect the clevis to the third from the outer hole of a control horn Make another pushrod assembly the same way 4 Make a 2 armed servo arm by cutting the opposi...

Page 11: ...he control horns and hinges then take the stabilizer and fin off the fuselage channel Use a bar sander and 150 grit sandpaper to round the leading edges of the fin and stabilizer Final sand all the tail surfaces with 320 grit sandpaper Tip If you don t mind a little extra work and would like to have a better looking model with a finished appearance taper the rudder and elevator by sanding the trai...

Page 12: ...ssembly Cover The Tail In This Sequence Cover The Wing In This Sequence Many modelers are experts at applying iron on coverings to wood surfaces but have never tried it over foam Here are some tips A Top Flite Hot Sock is highly recommended for covering the foam wing It helps distribute the heat and keeps dents scratches or swirls from being added during covering Find the optimum temperature of th...

Page 13: ... spinner optional and a propeller of the correct size to the engine 6 Mount the switch You can cut a slot and drill two holes just about anywhere and mount it directly to the fuselage or you can use foam mounting tape to secure the switch inside the fuselage at the rear where it is accessible This procedure must not be omitted A model that is improperly balanced will be uncontrollable resulting in...

Page 14: ...s as a starting point The throws are measured at the trailing edge of the ailerons elevator and rudder AILERONS 3 8 Up 3 8 Down ELEVATOR 5 8 Up 1 2 Down RUDDER 1 left 1 Right 1 Confirm the direction of the controls 2 It is highly recommended that you balance the propeller An unbalanced propeller can cause poor engine performance and decrease its life Vibration can cause problems with your in fligh...

Page 15: ...e air you should throttle back to half or even less than half throttle This will allow the model to fly much slower giving you time to calm down focus think and react This rule applies for nearly all the models you will probably build in the future Once your Trainer 40 is airborne and you have throttled back perform a gentle down wind turn You must apply a little up elevator to keep the model leve...

Page 16: ...nquest FM radio systems a good choice for experienced fliers FUTJ39 Great Planes Pro Thin Instant Set CA Instant setting Pro CA is ideal for fast assembly with a curing time of 1 3 seconds All Pro CAs are dated for freshness GPMR6002 O S 48 Surpass 4 stroke Engine Lower noise higher torque increased fuel economy and longer engine life make the O S 48 Surpass engine an excellent choice for your Aer...

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