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9

SAFETY PRECAUTIONS

1. Your Extra 300 SX should not be considered a toy, but 
rather a sophisticated, working model that functions very 
much like a full-size airplane. Because of its performance 
capabilities, the Extra 300 SX, if not assembled and 
operated correctly, could possibly cause injury to yourself 
or spectators and damage to property.

2. You must assemble the Extra 300 SX 

according to the 

instructions

. Do not alter or modify the model, as doing 

so may result in an unsafe or unfl yable 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 use an R/C radio system that is in good 
condition. All components must be correctly installed so 
that the model operates correctly on the ground and in 
the air. You must check the operation of the model and all 
components before 

every

 fl ight.

4. If you are not an experienced pilot or have not fl own 
this type of model before, we recommend that you get 
the assistance of an experienced pilot in your R/C club 
for your fi rst fl ights. If you’re not a member of a club, your 
local hobby shop has information about clubs in your area 
whose membership includes experienced pilots.

5. While this kit has been fl ight tested to exceed normal 
use, if the plane will be used for extremely high stress 
fl ying, such as racing, or if a motor or battery larger than 
ones in the recommended range is used, the modeler is 
responsible for taking steps to reinforce the high stress 
points and/or substituting hardware more suitable for the 
increased stress. 

We, as the kit manufacturer, provide you with a top quality, 
thoroughly tested kit and instructions, but ultimately the 
quality and fl yability of your fi nished model depends 
on how you build it; therefore, we cannot in any way 
guarantee the performance of your completed model, 
and no representations are expressed or implied as to 
the performance or safety of your completed model.

MOTOR SAFETY PRECAUTIONS

Failure to follow these safety precautions may result 
in severe injury to yourself and others.

  Wear safety glasses whenever running motors.

  Keep your face and body as well as all spectators away 

from the plane of rotation of the turning propeller.

  Keep loose clothing and objects such as pencils or 

screwdrivers that may fall out of shirt or jacket pockets 
away from the prop.

BATTERY CHARGING PRECAUTIONS

  Be careful to avoid overcharging the battery. Only use 

a LiPo approved charger. Never use a NiCd/NiMH peak 
charger. 

  Remember to check the temperature of the battery 

during the charge. The battery should not get hot. If it 
does, unplug the battery from the charger.

  Charge the battery at a maximum charge rate of 2.1 

amps. A higher charge rate will cause the battery to get 
hot.

  Never place the battery on combustible material or 

leave it unattended while charging.

  Never charge the battery in the plane.

  We recommend that a balancing charger be used to 

charge the battery. A properly cared for battery will last 
a long time. If the battery pack is continually charged 
without balancing the individual cells, the life of the 
battery pack will be shortened. 

ACADEMY OF MODEL AERONAUTICS

If you are not already a member of the AMA, please join! The 
AMA is the governing body of model aviation and membership 
provides liability insurance coverage, protects modelers’ 
rights and interests and is required to fl y at most R/C sites.

Academy of Model Aeronautics

5151 East Memorial Drive
Muncie, IN 47302-9252
Tele. (800) 435-9262
Fax (765) 741-0057

www.modelaircraft.org

Summary of Contents for extra 300 sx

Page 1: ...trol over the final assembly or material 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...

Page 2: ...a 3D capable aircraft with a 3S 1800mAh LiPo A 3S 2200mAh LiPo is also suitable but the additional weight of a heavier battery may detract from its 3D performance slightly In any case if you start exp...

Page 3: ...5mm hex key wrench M3 set screw M4 x 40 wing bolt Wing Foam wing Aileron servos 2 Servo extensions Y harness Aileron linkage pushrods screw lock connectors 90 pushrod connectors R L horizontal stabil...

Page 4: ...o is set up later 4 Fit the elevator and rudder pushrods into the middle hole in their respective control horns and secure with the 90 pushrod keepers 5 Fit the tail gear wire into the tail gear assem...

Page 5: ...ne in the photo approximately 2 1 2 65mm ahead of the wing bolt 10 Connect the servo and ESC wires to the receiver If using a dual diversity receiver with two antennas use tape to hold the antennas pe...

Page 6: ...Down 3 4 19mm 21 Up 3 4 19mm 21 Down NOTE The control throws are measured at the widest part of each surface at the root ends of the elevators and ailerons and at the bottom of the rudder Set the Fail...

Page 7: ...down suspended by the wing with your fingertips This procedure will be easiest and most accurate if you can feel the C G range with your fingertips A quick way is to temporarily insert T pins or regul...

Page 8: ...1440mAh 1440mAh divided by 170mAh minute 8 47 minutes we ll round down to 8 1 2 minutes On your second flight perhaps set your timer to 7 minutes and repeat the procedure to continue to log data for c...

Page 9: ...tructions but ultimately the quality and flyability of your finished model depends on how you build it therefore we cannot in any way guarantee the performance of your completed model and no represent...

Page 10: ...16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 B C D E F G FORMULAS Flight Time 10ths Recharge Capacity mAh minute Battery Capacity Target Capacity to Use In Flight Recommended Flight Time Average In F...

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