E-flite Brio 10 ARF - Manual (Page 37)

Some 35A–40A brushless ESC on the market
either warn against running four (4) sub-micro
servos or do not specify this setup will work.
The reason is because oftentimes running four
sub-micro servos with a 3-cell Li-Po battery
are outside the range of the controller’s BEC
capability. Most controllers on the market can
only handle 800mA to 1 Amp continuous draw
when using a 3-cell Li-Po battery, some even
lower. However, many consumers are
still running four sub-micro servos with success.
If you choose to attempt this, you must set up
your plane properly and check the current
draw (under load) of your radio system,
making sure it is within the specifications of the
controller’s BEC. Be sure to put the ESC in a
position to get the best airflow since cooling
will help the BEC capacity.
Our E-flite 40A Brushless ESC (V2) (EFLA312B)
is equipped with a higher rated, heavy-duty
BEC that can dissipate more heat and handle
higher wattage when using a 3-cell Li-Po
battery. Make sure you specify this part number
to ensure you are getting the correct controller.
You should always still check your setup first
before flying.
Some other alternatives are available:
 A. Disable the controller’s BEC per manufacturer’s
instructions and use a flight pack battery.
 B. Buy a device such as an external BEC that is
specified to handle more current.
 C. Select a controller such as the Castle
Phoenix 35 or our updated E-flite ™ 40A Brushless
ESC (EFLA312B) that has a higher rated, heavy-
duty BEC.
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