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12

Balance the Model (C.G.)

WARNING! 

DO NOT plug the motor battery into the ESC.

 1. At this stage the model should be in ready-to-fl y condition 

with all of the systems in place including the motor, propeller, 

spinner, radio system, battery and battery hatch. 

NOTE:

 The 

landing gear will have a slight effect on the C.G. position.

 2. Use a felt-tip pen or 1/8" [3mm]-wide tape to accurately 

mark the C.G. on the top of the wing on both sides of the 
fuselage. The C.G. is located 3" [76mm] back from the 
leading edge of the wing at the wing root where the wing 
meets the fuselage.

This is where your model should balance for the fi rst fl ights. 
Later, you may wish to experiment by shifting the C.G. up 
to 1/4" [6mm] forward or 1/4" [6mm] back to change the 
fl ying characteristics. Moving the C.G. forward may improve 
the smoothness and stability, but the model may then 
require more speed for takeoff and make it more diffi cult 
to slow for landing. Moving the C.G. aft makes the model 
more maneuverable, but could also cause it to become too 
diffi cult to control. In any case, start at the recommended 
balance point and do not at any time balance the model 
outside the specifi ed range.

 3. With all parts of the model installed (ready to fl y) and a 

battery pack in place (do not connect it), place your fi ngers 
on the marks you made and balance the model.

 4. If the tail drops, the model is “tail heavy” and the battery 

pack must be shifted forward or weight must be added to 
the nose to balance. If the nose drops, the model is “nose 
heavy” and the battery pack must be shifted aft or weight 
must be added to the tail to balance.

 5. Using a felt-tip pen, mark the position of the battery 

pack in the battery compartment. This will help eliminate trim 
changes or unwanted surprises each time that you change 
the battery. When using different capacity batteries, you 
may have to re-balance your plane and place an additional 
mark in the battery compartment. If you plan to fl y the model 

with and without landing gear, make separate marks to help 
you know where to place the battery to balance correctly in 

each confi guration.

  6.  If  additional  weight  is  required,  use  Great  Planes 

(GPMQ4485) “stick-on” lead. A good place to add stick-on 

nose weight is to the motor box under the cowl (don’t attach 

weight to the cowl—it is not intended to support weight). 
Begin by placing increasing amounts of weight on the top 

of the cowl over the fi rewall until the model balances. Once 

you have determined the amount of weight required, it can 

be permanently attached by removing the cowl and installing 
the weight.

IMPORTANT:

 If you found it necessary to add any weight, 

recheck the C.G. after the weight has been installed.

APPLY THE DECALS

 1. Be certain the model is clean and free from oily 

fi ngerprints and dust. Prepare a dishpan or small bucket 
with a mixture of liquid dish soap and warm water – about 

½ teaspoon of soap per gallon of water. Submerse one of 

the decals in the solution and peel off the paper backing. 
Note: Even though the decals have a “sticky-back” and are 
not the water transfer type, submersing them in soap and 
water allows accurate positioning and reduces air bubbles 
underneath.

 2. Position the decal on the model where desired. Holding the 

decal down, use a paper towel to wipe most of the water away.

 3. Use a piece of soft balsa or something similar to 

squeegee the remaining water from under the decal. Apply 
the rest of the decals the same way.

Summary of Contents for P-51 MUSTANG MKII EP Rx-R

Page 1: ...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 buyer is not prepared to accept the liability associated with the use of this product the buyer is advised to return this kit immediately in new and unused condition to the place of purchase To make a warranty claim send the defective part or i...

Page 2: ... to property 2 You must assemble the model according to the instructions Do not alter or modify the model as doing so may result in an unsafe or unflyable model In a few cases the instructions may differ slightly from the photos In those instances the written instructions should be considered as correct 3 You must take time to build straight true and strong 4 You must use an R C radio system that ...

Page 3: ... is perfect for 3S batteries used with the P 51 Mustang ARF and may be powered either by an external DC power source such as a 12V battery or a 110V AC outlet The Onyx also has an adjustable charge rate to charge your batteries in as little as a half hour or less depending on the condition of your batteries and the manufacturer s specified charge rate The Onyx can also charge large batteries and b...

Page 4: ...4 CONTENTS 1 Fuselage 2 Canopy Hatch 3 Spinner 4 Propeller 5 Propeller Adapter 6 Fixed Landing Gear w Covers 7 Horizontal Stabilizer 8 Foam Plugs 9 Tail Wheel 10 Wing 11 Cowl 1 4 7 2 5 8 3 6 9 10 11 ...

Page 5: ... the stabilizer into the opening in the fuselage When you install the stabilizer slide the right side of the stabilizer into the left side of the fuselage Be sure to key the stab to the slots in the fuselage Position the stab so that it is centered and the holes in the bottom of the fuselage are aligned with the holes in the stabilizer 5 Partially install the two foam plugs into the holes in the b...

Page 6: ...tion as recommended by the radio manufacturer 2 Separate the hook side from the loop side of the remaining adhesive backed hook and loop material Stick the hook side to the fuselage and the loop side to the back of your battery pack To prepare your other battery packs you may purchase more Great Planes hook and loop material GPMQ4480 from Tower Hobbies 3 Attach the wing to the fuselage with a 4mm ...

Page 7: ...ing compound to the threads and re installing the locking screws 6 Using your radio center the aileron servos Check to see that the ailerons are also centered If they need adjustment loosen the locking screw and adjust the ailerons until they are centered at zero deflection Tighten the set screw of the screw lock pushrod connector Again use threadlocker on the threads OPTIONAL FLAP INSTALLATION 1 ...

Page 8: ...Gently shake the wing to guide the nut and string to the opening in the top center of the wing 7 Attach the flap servo lead to the string and carefully pull it through the wing and out of the opening Tip Tie the string to the retract cable and use a piece of masking tape to position the string at the end of the connector 8 Connect a Y harness to the flap servo lead 9 Plug the flap servo into the f...

Page 9: ...t amount of throw INSTALL THE FIXED LANDING GEAR Optional This airplane is supplied with fixed landing gear but this should only be used if you have an asphalt or concrete runway Any length of grass will be too much resistance for the wheels to roll on Landing gear is not necessary for take off or landing The airplane is easily hand launched and lands very well on its belly in grass 1 Install the ...

Page 10: ...a charged battery 2 With the transmitter and receiver still on check to make sure that all of the control surfaces are correctly centered so that they are at zero deflection Check to see that the locking screws on the pushrod connectors are tight and that the servo arm locking screws are installed Make sure that the nylon Faslinks are also installed properly and are holding the pushrods securely F...

Page 11: ...rs rudder and ailerons If the control throws are too high you can move the pushrod connectors on the servo arms inward toward the output shaft to decrease total travel These are the recommended control surface throws ELEVATOR HIGH RATE LOW RATE 1 4 6mm 12 Up 1 4 6mm 12 Down 1 8 3 mm 6 Up 1 8 3 mm 6 Down 1 2 13 mm 23 Up 1 2 13 mm 23 Down 3 8 10 mm 18 Up 3 8 10 mm 18 Down 11 16 17 mm 18 Right 11 16 ...

Page 12: ...felt tip pen mark the position of the battery pack in the battery compartment This will help eliminate trim changes or unwanted surprises each time that you change the battery When using different capacity batteries you may have to re balance your plane and place an additional mark in the battery compartment If you plan to fly the model with and without landing gear make separate marks to help you...

Page 13: ...teries LiPo batteries can cause serious damage if misused ALWAYS unplug the motor batteries first ALWAYS use a LiPo approved charger ALWAYS set the charger s output volts to match the battery volts ALWAYS charge a LiPo battery in a fireproof location ALWAYS charge through the charge lead ALWAYS KEEP OUT OF THE REACH OF CHILDREN ALWAYS remove the batteries from the plane after a crash Set them asid...

Page 14: ...ife Take Off Until you have become comfortable with flying your P 51 do not fly if the wind speed is greater than 10 mph 16 kilomoters hr One final check before takeoff always double check the flight control response to your inputs from the transmitter before every flight Be certain the ailerons elevator and rudder respond correctly and that none of the controls has inadvertently become reversed I...

Page 15: ...lly add up elevator to control the glide path and altitude Continue to apply elevator until the model touches down at which time you should be holding full or nearly full up elevator This will cause the airplane to slow and settle to the ground CAUTION If during a rough landing the propeller be comes jammed and cannot rotate the battery and speed control will become very hot if you attempt to add ...

Page 16: ...16 2016 Tower Hobbies A subsidiary of Hobbico Inc v1 1 ...

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