The R2 Buffer pack
is snugly installed
inside the author’s
Synergy E7 SE.
The buffer pack control board has highly visible
LEDs that let you know the pack is on and
the power is gone, it’s gone! There’s
no autogyroing safely in. It’s just going
to come down,
usually hard, and
probably on the
only patch of
concrete on the
entire field. If you
use a BEC, what
can you do?
There are a
of backup guards that you can put
on your helicopter. They consist of a
number of large capacitors that charge
while you are flying. Given a sudden
loss of power, they store enough energy
so that you can safely autogyro your
helicopter to the ground in one piece.
They are lightweight and self-sustaining,
so you don’t have to remember to
My friend, Danny Melnik, at
DemonAero.com, convinced me to try
the R2 Buffer Circuit 50F in my Synergy
E7. It uses 50 Farad capacitors that store
enough power to get your aircraft down
to the ground in a hurry should the need
arise. All you have to do is plug it into an
empty receiver (or gyro) slot and it will
charge itself when you power on.
A red LED light indicates that the
buffer pack is getting power, and a
green LED light shows you that it is
fully charged. There is also a switch that
allows you to turn it off after flight, but
it will automatically discharge regardless.
It has two adjustable potentiometers
on the controller board. One lets you set
the charge rate—from 300 mAh to 900
mAh—and the second allows you to set
the low-voltage cutoff for the capacitors.
It is rated up to 8. 5 volts, so it’s perfect
for use with high-voltage setups. On a
full charge, it will give you anywhere
from 10 to 60 seconds of power
(depending on your setup), which could
mean the difference between a quick
landing and taking home a bag of parts.
In addition to the backup power
feature, there are a few other advantages.
It will buffer current peaks to prevent
damage to BECs and ESCs, as well as
buffering reverse induction currents
(electromotive force, aka EMF) from
servos (which I didn’t even know
existed!). It stabilizes the output voltage
during heavy maneuvers, and helps
prevent brownouts if your BEC voltage
momentarily drops too low.
It is a handy piece of equipment to
have, and my Synergy E7 has never been
happier! If you use a buffer pack/backup
guard and one has saved your heli, I’d
love to hear your story!
Synergy R/C Helicopters
(217) 398-8970, ext. 2
International Radio Controlled Helicopter
106 Model Aviation JULY 2015 www.ModelAviation.com