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TAXIING
Start the engine and set the throttle trim for a slow, steady idle. Have
your instructor or a helper hold the plane while you work the
controls. Upon release advance the throttle slightly to start rolling,
then back-off the power to prevent going too fast and possibly taking
off. Stand behind the plane as it taxies away from you and note the
direction it turns as you move the rudder control. One thing to keep
in mind with R/C models (whether it be cars, boats, or planes) is that
the steering controls may seem to “reverse” when the model is
moving toward you. For example, if you are flying toward yourself,
and you give a right control input (ailerons or rudder), the model will
move off to your left. The fact of the matter is, of course, that the
controls are not reversed and the aircraft did actually enter a right
turn. The plane does move off to your left from your vantage point,
but if you imagined yourself in the cockpit you would realize the
plane turned to the right as commanded. All it takes is a little practice
to maintain proper orientation of your aircraft, but that’s why we
recommend finding an instructor.

When you feel comfortable, advance the throttle a little while
standing behind the plane to get the feel of a takeoff roll, but pull
back on the power before the model lifts off. Try this several times,
adding a little more power each time. Use the rudder stick on your
transmitter to steer the plane with the nose wheel while on the
ground If the plane starts to veer off, immediately cut the power to
prevent a mishap.

Although many R/C pilots have taught themselves to fly, we strongly
recommend that you find an instructor to help get you started.
Although trainers offer the greatest opportunity of success for the
self-taught, there is a high probability that you will crash your
airplane on the first flight. Protect your investment of time and
money—obtain the assistance of an experienced R/C pilot.

TAKEOFF
Your first flights should be made in little or no wind. If you have dual
rates on your transmitter, set the switches to “low rate” for takeoff. Taxi
into position, pointing directly into the wind. Although this model has
good low speed characteristics, you should always build up as much
speed as your runway will permit before lifting off, as this will give
you a safety margin in case of a “flame-out.”  Advance the throttle
smoothly to the wide open setting. When the plane has sufficient
flying speed (you won’t know until you try), lift off by smoothly
applying a little up elevator (don’t force it off into a steep climb!), and
climb out gradually, trying to keep it straight and the wings level.
Climb to about 100 feet before starting a VERY gentle turn by moving
the aileron stick. Apply a little more back pressure on the elevator
stick as the model turns. Stop the turn by moving the aileron stick in
the opposite direction until the wings are level, then return the stick
to the neutral position. Pull the power back to 1/2 throttle.

FLYING
We recommend that you take it easy with your model for the first
several flights and gradually “get acquainted” with the plane as your
engine becomes fully broken-in. Trainers are designed to fly level
with neutral elevator trim at approximately 1/3 - 1/2 throttle — this
is the best speed for learning to fly. On 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 are
accomplished by banking the aircraft with the ailerons then gently
adding some back stick (up elevator). Enough back stick should be
held in to keep the aircraft at a constant altitude. To stop turning, apply
opposite aileron to level the wings, then release the stick. There is a
memory aid that may help keep you out of trouble when the plane is
flying toward you — “put the stick under the low wing.” In other
words, move the aileron stick in the direction of the low wing to raise
that wing. When you are comfortable flying the aircraft, you can
practice using the rudder along with the ailerons to “coordinate” the
turns — usually, a small amount of rudder applied in the direction of
the turn will keep the tail following in the exact same track as the nose.

The most common mistake when learning to fly is “over control.”
Think of pressure instead of large movements of the control sticks.
Remember, most trainers will recover from almost any over control
situation (given enough altitude) if you simply let go of the sticks.

Add and practice one maneuver at a time, learning how your model
behaves in each one. For ultra-smooth flying and normal maneuvers,
we recommend using the “low rate” settings as listed on page 18.
High rate control throws will give your model enough control for
loops, barrel rolls, and many other basic aerobatic maneuvers.

After you have several flights on your model, it’s time to reward
yourself with your first aerobatic maneuver — a loop. Climb to a safe
altitude and turn into the wind. Apply full throttle, level the wings,
then slowly pull back on the elevator stick to about 1/2 to 3/4 up
elevator (depending on your throws), and hold this control input.
After you go over the top and start down the back side of the loop,
pull the throttle back to about half. This will keep the stresses on the
airplane low and the airspeed relatively constant. Keep holding “up”
elevator until the plane is level, then slowly release the stick. You’re
done! It’s really that easy!

CAUTION (THIS APPLIES TO ALL R/C AIRPLANES): If, while flying,
you notice any unusual sounds, such as a low-pitched “buzz,” this
may be an indication of control surface “flutter.” Because flutter can
quickly destroy components of your airplane, any time you detect
flutter you must immediately cut the throttle and land the airplane!
Check all servo grommets for deterioration (this will indicate which
surface fluttered), and make sure all pushrod linkages are slop-free.
If it fluttered once, it will probably flutter again under similar
circumstances unless you can eliminate the slop or flexing in the
linkages. Here are some things which can result in flutter: excessive
hinge gap; not mounting control horns solidly; sloppy fit of clevis pin
in horn; elasticity present in flexible plastic pushrods; side-play of
pushrod in guide tube caused by tight bends; sloppy fit of Z-bend in
servo arm; insufficient glue used when gluing in the elevator joiner
wire or aileron torque rod; excessive flexing of aileron, caused by
using too soft balsa aileron; excessive “play” or “backlash” in servo
gears; and insecure servo mounting.

21

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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