FASST compatible receivers for use
with the Futaba radio systems.
The three radios shown in the
foreground of Figure 12 are receivers
from different manufacturers, and
each works perfectly. The Corona
R6FA-SB is even S-bus compatible.
In addition, Tactic sells a device
called an Anylink. It plugs into the
back of my Futaba and lets me
transmit to all my Tactic receivers. I
am able to use my Futaba 72 MHz
radio on the 2. 4 GHz band.
One last thing about selecting the
radio to use with your multi-rotor.
While simple radios like the HK6
and the Tactic are okay for the basics,
you want a radio that gives you
configurability, and I don't just mean
reversing control for direction and
• Ability to adjust the endpoints
for each control.
• Multiple model storage for the
Look for a radio that has these
• 2. 4 GHz.
Throttle curves and sub trims are
also a plus. If you select the right
radio, it will serve all your R/C needs
— be it flying a multi-rotor or
controlling a ground based robot.
The single most important
component in a multi-rotor is the
tiny computer called the flight
controller (shown in Figure 13).
The flight controller uses gyros and
accelerometers to sense its current
It then controls the speed of
each of the motors to provide any
corrections to keep the craft level.
At the same time, the controller is
monitoring the input from the
receiver so that it can factor in
your transmitter joysticks.
For example, when you
increase the throttle it will increase
the rpm of all motors by the same
amount. If you move the aileron
control to the right, it will raise the
rpm of the motors on the left and
decrease the rpm of the motors on
the right. It does all this while also
taking into account the gyros and
Some of the flight controllers
have additional sensors like
barometric sensors to help with
altitude holding. Still others have
upgrade capabilities that add GPS and
compass sensors. These will allow
even more stabilization of your craft.
• DJI NAZA
• Multiwii V2.0
personal preferences — will affect the
I will cover mounting each of
these in the Kronos Flyer. I will also
cover the setup interface for each
one. The actual settings and tuning
procedures and detailed reviews for
each controller will be posted on the
Kronos Flyer web page.
In the fourth article of this series,
I will include as much of this
information as space permits. You will
need to keep in mind that the
settings and procedures for tuning
will change as firmware upgrades are
made available to the various
When sensors are added,
variations in design — and even
In this series, I will be touching
on three particular controllers:
• Hobby King KK2
Next time, I will be concentrating
on the actual design of the Kronos
Flyer. I will provide you with a
complete breakdown of all the parts.
This will give you a chance to collect
everything for assembly in the third
installment. For now, you need to
start thinking about the radio you are
going to use to give your Kronos Flyer