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INSTALL THE WING MOUNTING DOWELS

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2. Insert both wing mounting dowels so they protrude an equal

amount on both sides of the fuselage. Mix 1/4 oz. (7ml) of 30-minute
epoxy. Apply glue around the dowels next to the fuselage and slide
them in and out of the fuselage to help distribute the epoxy into the
fuselage. Using a paper towel, spread the excess epoxy around the
ends of the dowels. This will fuelproof and add strength to the wood.
From the inside of the fuselage, apply more epoxy around the dowels
where they meet the sides of the fuselage. These wing dowels will be
used as the anchors for the rubber bands to hold the wing in position.
Wipe off all excess epoxy using a paper towel and rubbing alcohol.

LOCATE THE STABILIZER SLOT

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3. Locate the slot for the horizontal stabilizer under the covering

on the tail section of the fuselage by gently pressing the covering
with your finger. The slot is located on both sides of the fuselage.
Using a sharp hobby knife, carefully remove the covering, exposing
the slots. Note: Do not cut into the wood around the slot.

LOCATE THE VERTICAL FIN SLOT

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4. Using the same technique as in step 3, locate the slot for the

vertical fin on the top of the fuselage. Remove the covering using a
sharp hobby knife.

MARK THE CENTERLINE

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5. On the top surface of the horizontal stabilizer, measure to find

the exact center from side to side. Draw a “centerline” using a felt-tip
pen. Next, extend that centerline onto the trailing edge, in the gap,
as shown in the photo. (DO NOT MARK ON THE ELEVATOR WHEN
PERFORMING THIS STEP.)

ALIGN THE STABILIZER WITH THE WING
Note: Do not 
use any glue until instructed to do so.

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6. Insert the stabilizer into the horizontal stabilizer slot so it is

centered in the fuselage (A). Place the wing onto the fuselage and
secure with two rubber bands. View the plane from a distance of
about 8 feet (2.4m) to check the alignment of the stabilizer to the
wing (B). If the stabilizer is not parallel to the wing, remove the
stabilizer and sand the stabilizer base slightly on the high  side.
Replace the stabilizer and check the alignment. Continue this
process until the wing and stabilizer are parallel.

ALIGN THE STABILIZER WITH THE FUSE

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7. Attach a piece of string with a T-pin to the center of the fuselage

as shown. Hold the string to one corner of the horizontal stabilizer.
Mark the position on the line, then swing the line over to the
opposite tip on the stabilizer. If the mark does not line up, adjust the
positioning of the stabilizer and repeat the “mark and swing”
procedure until the stabilizer is in proper alignment.

STRING

STRING

T-PIN

EQUAL MEASUREMENTS

B=B

A=A

B

B

A

A

Wing/Stab Align

Horizontal
Stabilizer

Fuse

Wing

8

Summary of Contents for Tower Trainer 40 ARF

Page 1: ...terial used for final assembly no liability shall be assumed nor accepted for any damage resulting from the use by the user of the final user assembled product By the act of using the user assembled product the user accepts all resulting liability If the buyers are not prepared to accept the liability associated with the use of this product they are advised to return this kit immediately in new an...

Page 2: ...y and during your first flights You ll learn faster and avoid risking your model before you re truly ready to solo Your local hobby shop has information about flying clubs in your area whose membership includes qualified instructors You can also contact the national Academy of Model Aeronautics AMA which has more than 2 500 chartered clubs across the country Through any one of them instructor trai...

Page 3: ...bove contact Hobby Services at 1 217 398 0007 Monday through Friday 9am 5pm central time Or send the Tower Trainer to Hobby Services 1610 Interstate Drive Champaign Illinois 61822 The information Hobby Services will need is a letter explaining what happened the letter is to be signed by the instructor and yourself name of flying field name of instructor and a copy of invoice as proof of purchase T...

Page 4: ...s 22 Fuel Tank Stopper 23 Plywood Wing Joiner 24 Fuel Tank 25 Main Landing Gear 2 pcs 26 Fuel Tank Clunk 27 Silicone Fuel Tubing 28 Aileron Servo Tray Mounting Blocks 29 Aileron Servo Tray 30 Nose Landing Gear Wire 31 Wing Mounting Dowels 2 pcs 32 Wheels 64mm 2 1 2 in 3 pcs 4 PARTS LIST 1 5 4 17 18 32 25 9 2 7 6 31 26 22 27 24 15 8 30 32 23 29 28 21 19 20 3 10 32 25 Before assembly match the parts...

Page 5: ...y knife remove the covering from the wing panels for the aileron servo TEST FIT THE WING JOINER 5 Test fit the wing joiner in both wing panels by sliding the joiner into the joiner cavity in the wing The joiner should slide in with little resistance up to the centerline that was drawn on the joiner If the joiner will not fit in the cavity lightly sand any uneven surfaces from the joiner edges side...

Page 6: ...o mounting blocks and position them with the dihedral line up Cut or sand the marked angle out of the block This angled side will be placed against the wing when the servo tray is installed ASSEMBLE THE SERVO TRAY 11 Glue the balsa aileron servo mounting blocks onto the aileron servo tray using either 6 minute epoxy or medium CA Make sure that the angled side you just cut is facing away from the p...

Page 7: ...ron pushrods Thread the clevises onto the rods so that 1 16 1 5mm of the rod protrudes between the clevis forks INSTALL THE PUSHRODS 18 Attach the pushrods to the aileron control horns If the pins from the clevises do not fit the holes in the horns drill the holes out to 1 16 1 5mm Press the forks of the clevises together until the pin snaps into the opposite fork Slide the safety tubing into posi...

Page 8: ...y knife MARK THE CENTERLINE 5 On the top surface of the horizontal stabilizer measure to find the exact center from side to side Draw a centerline using a felt tip pen Next extend that centerline onto the trailing edge in the gap as shown in the photo DO NOT MARK ON THE ELEVATOR WHEN PERFORMING THIS STEP ALIGN THE STABILIZER WITH THE WING Note Do not use any glue until instructed to do so 6 Insert...

Page 9: ...nt several times while the epoxy cures INSTALL THE VERTICAL FIN 11 Test fit the vertical fin into the slot on the top of the fuselage Sand the edges of the slot if necessary for a snug fit When fit properly the bottom of the vertical fin will rest on the top of the horizontal stabilizer Remove the fin and mix up 1 4oz 7ml of 30 minute epoxy Using a mixing stick apply epoxy to the top of the stabil...

Page 10: ...tach the Z bend of the wire to the hole on the steering arm Slide the wire into the pushrod housing so that the screw on the steering arm is facing forward The wire should be on the bottom of the steering arm INSTALL THE NOSE LANDING GEAR WIRE 5 Install the nose landing gear wire through the nose gear bracket Next the wire will go through the steering arm Holding the steering arm against the beari...

Page 11: ...ece of silicone fuel tubing Install the clunk onto the tubing Slide the other end of the tubing onto the tube that was not bent in the previous step Measure the distance from the end of the clunk to the back of the stopper Position the fuel tube so the distance measures 5 127mm INSTALL THE STOPPER ASSEMBLY 3 The stopper assembly can now be inserted into the tank The vent tube should be adjusted so...

Page 12: ...e remaining screws and washers Pass the screws through the engine mount pads The screws then go through the mount passing in front of and behind the engine mounting flange The pads will be resting on the top of the engine s mounting flanges The 4mm nuts are then placed into the recesses on the bottom of the engine mount Start the screws but do not tighten them at this time We still need to align t...

Page 13: ...tall the servos into the tray as shown using the screws included with the radio system It may be necessary to enlarge the openings for the servos The arms should be removed from the servos during the installation The servos in the photo are marked as to which is rudder R elevator E and throttle T to help in getting them plugged into the receiver correctly RECEIVER AND BATTERY INSTALLATION 3 Follow...

Page 14: ...d a 3mm washer Slide the washer onto the screw Pass the screw through the elevator from the top SECURE THE ELEVATOR CONTROL SCREW 8 Slide a 3mm washer onto the screw from the bottom Thread a 3mm nut onto the screw Tighten the screw but not too tight as to crush the underlying wood Use threadlock on the nut to prevent loosening INSTALL THE ELEVATOR CONTROL HORN 9 Thread the elevator control horn on...

Page 15: ... the opening in the fuselage next to the fin CONNECT THE RUDDER PUSHROD 15 Attach a clevis to a pushrod Attach the clevis to the rudder control horn CENTER THE SERVOS USING THE RADIO 16 Turn on the transmitter then the receiver Center all of the trim levers on the transmitter Turn off the receiver and then the transmitter By doing this your servos will be at their centered neutral position when yo...

Page 16: ...orn too CONNECT THE STEERING PUSHROD 22 Slide the steering pushrod wire though the Screw Lock Pushrod Connector With the rudder servo in its neutral position center the nose wheel so that the airplane will be able to taxi forward in a straight line Secure the pushrod into position by tightening the screw on the connector CONNECT THE THROTTLE PUSHROD 23 With the radio system on place the throttle s...

Page 17: ...e pin into the top of the fin Adjust the trimmed servo arm until there is a slight amount of tension on the antenna wire The rubber band should be partially stretched Note Never push a pin through the antenna or trim off the excess wire FINAL RADIO INSTALLATION INSPECTION 29 Using mixing sticks secure the radio system and fuel tank as shown in the photo It is best to save this step until after you...

Page 18: ... Aileron 1 2 13mm up 5 8 16mm up 1 4 6mm down 3 8 9 5mm down Elevator 3 8 9 5mm up 1 2 13mm up 3 8 9 5mm down 1 2 13mm down Rudder 1 25mm left Same as low rate 1 25mm right Same as low rate These are the suggested deflection from center of the control surface If you need more control movement you should move the clevis to a hole closer to the control surface or you can move the rod at the servo aw...

Page 19: ...alm down and discuss the flight with your instructor Spending some time after each flight talking about what happened and what you need to work on to improve your skills will pay off with greater confidence in your own growing abilities CHARGE THE BATTERIES Follow the battery charging procedures in your radio instruction manual You should always charge your transmitter and receiver batteries the n...

Page 20: ...t fly my model unless it is identified with my name and address or AMA number on or in the model 9 I will not operate models with pyrotechnics any device that explodes burns or propels a projectile of any kind Radio control 1 I will have completed a successful radio equipment ground check before the first flight of a new or repaired model 2 I will not fly my model aircraft in the presence of spect...

Page 21: ...later flights if you want your model to maintain level flight at full throttle you will need to give it a little down trim Your first flights should consist of mostly straight and level flight with gentle turns to keep the model over the field These flights will give you practice at coordinating your control inputs and maintaining the proper orientation of the airplane As mentioned earlier turns a...

Page 22: ... C airplane without any pre determined flight pattern CA Abbreviation for Cyanoacrylate An instant type glue that is available in various viscosities Thin Medium Thick and Gel These glues are ideal for the assembly of wood airplanes and other materials Note Most CA glues will attack Styrofoam Carburetor The part of the engine which controls the speed or throttle setting and lean rich mixture via s...

Page 23: ...source for igniting the fuel air mixture in the engine When starting the engine a battery is used to heat the filament After the engine is running the battery can be removed The wire filament inside the plug is kept hot by the explosions in the engine s cylinder See next heading and idle bar plug Glow Plug Clip Battery A 1 2 volt battery which is connected to the glow plug on a model airplane engi...

Page 24: ...opeller and read out the engine RPM Tip Stall The outboard end of one wing the tip stops developing lift causing the plane to roll suddenly in the direction of the stalled wing This situation is not fun when you are only a few feet off the runway trying to land Trainer Airplane A model designed to be inherently stable and fly at low speeds to give first time modelers time to think and react as the...

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