Need? No. Want? Yes.
Do I need a computer radio? My RTR transmitter seems fine, but it would
be nice to have a cooler radio.
Need? Probably not. Want? Of course, everyone wants a cool computer
radio. If you really need one, you already know it because you’ve hit a
setup snag that your basic radio can’t get around. For example, you may
need to set your steering or throttle endpoints individually, or you’d like
to “mix” channels for a four-wheel steering system or mechanical front
and rear brakes. Computer radios can also have faster response times
“S” is for “Series”
In reference to LiPo battery packs, what does the “S” mean in “2S,”
“3S,” and so on. Does it mean “cells”? If so, it would make more
sense to call them “2C” and “3C,” right?
You are actually on the right track. ;e “2S”
does mean two cells, but it is expressed as
“S,” because it means that the two cells are
connected in series (S). Cells are said to be
connected in series when they are assembled
negative to positive, as in the illustration.
Series connection combines the voltages of
the two cells, so two 3.7-volt cells become
one 7.4-volt pack.
Although rarely seen in surface RC, cells
can also be configured in parallel (negative
to negative, positive to positive), expressed
as “P.” When connected in parallel, the cell’s
capacities combine. Let’s say our two 3.7-volt
cells in the illustration are 4000mAh cells. By
connecting them in parallel, we would get a
3.7-volt pack with 8000mAh of capacity.
When cells are connected in series, their voltages are
combined. ;is illustration shows a 2S pack: two 3.7-volt
cells in series. ;e cells are connected by their positive (+)
and negative (-) tabs to deliver 7. 4 volts at the connector.
With its covering removed, we
can see the two stacked cells of
this 2S LiPo. ;e cells have been
tinted so that you can easily
Many computer radios o ;er channel mixing, which is perfect for setting up four- wheel
steering systems (as seen on this Clod Buster), among other uses.
A computerized radio like this Futaba
3PV makes it easy to set endpoints,
rates, exponential, and more—plus
store settings for multiple models.
than other systems,
but most mortals don’t
have the reflexes to feel such
millisecond di;erences. But even
if you don’t need a computer
radio, that doesn’t mean you
won’t appreciate one. Even a
basic computer radio will let you
set up your car more precisely,
and features like steering
exponential can make
it easier to drive your