The receiver included with the 7C 2.4
weighs only 9 grams with the case. It
should be mounted at least 2 inches
away from any metal.
Power Switch: Futaba 7C 2.4 GHz Radio System
MICHAEL RAMSEY
A popular seven-channel system is finally
available with FASST sophistication
AS THERE ARE many types of RC models, there are many types of
radio systems that can meet or exceed a given project’s needs. Most of
our aircraft in the 2- to 16-pound range require a minimum of fourchannel
control, but that just gets the model flying. What if the RC pilot
wants more options?
The mainstream radio systems vary from three- to 14-channel
control. A seven-channel radio is near the middle and, in
most cases, offers the most bang for the buck. The
seven-channel units are typically better than sixchannel
radios because they offer more mixing
capability and flexible switch options.
The perception is that nine- to 14-channel radios
are overly complex, but the six- and seven-channel
radios are friendly to use. If a buyer is looking to
purchase his or her first computer radio system, a
seven-channel unit is worth every extra dollar
compared with a six-channel system.
To suit the needs of the sport pilot and many
aggressive 3-D aircraft or helicopter pilots, the
Futaba 7C has proven to be extremely popular. I
own two of the original 72 MHz versions—one for
aircraft and the other for helicopter.
I have the latter because the smooth collective
stick on the helicopter version is such a strong
benefit for holding a steady hover. The throttle’s
firm ratchet movement on the aircraft version
helps me hold the power at a constant speed more
easily when coordinating rudder input during
complex maneuvers such as Point Rolls.
The new Futaba 7C 2.4 GHz maintains most of
the programming as the still-viable 72 MHz
versions, but because it’s dedicated to the new
Futaba Advanced Spread Spectrum Technology
(FASST), it offers a dramatically improved control
feel a pilot at any skill level can appreciate. New
program features include dual elevator servos (AILEVON),
swash-throttle mix, and governor programmability. The fail-safe
programming has also been changed; I’ll include more about that later.
The new transmitter has more precise stick gimbals. If I moved the
The 7C 2.4 transmitter antenna
can rotate 180° and fold down
to 45° and 0° angles to fit easily
inside common carrying cases.
+
• Versatile features similar to high-end systems’
• Lightweight, full-range receiver
• Upgraded control sticks with firm tension
• Program dial speeds model setup
• Available with heavy-duty digital servos
• Fantastic response to pilot’s transmitter commands
• Dual elevator servo programming
-
• Instruction manual is incomplete in some
function descriptions
• Offering higher-capacity battery packs would be
a welcome benefit
Pluses and Minuses
60 MODEL AVIATION
05sig2.QXD 3/25/08 10:00 AM Page 60
May 2008 61
Overview
System (as reviewed): Futaba 7C 7-channel 2.4GHz (FUTK7000)
Pilot skill level: Intermediate to advanced
Intended usage: 2- to 16-pound aircraft or helicopter
Includes: T7C 2.4 GHz transmitter; R617FS FASST sevenchannel,
full-range receiver; 1000 mAh, 4.8-volt Ni-Cd receiver
battery; 120-volt battery charger with 70 mA transmitter output
and 100 mA receiver output; four S3152 digital high-torque
servos; 600 mAh, 9.6-volt Ni-Cd transmitter battery; switch
harness with charge cord; black transmitter neck strap; servomounting
hardware and instruction manual
Price: $349.98
Options
The 7C 2.4 GHz system is available in the following
configurations (all include the Futaba R617FS receiver):
• Airplane version with four S3152 digital high-torque servos
• Helicopter version with four S3152 digital high-torque servos
• Airplane version with four S3004 standard ball-bearing servos
• Helicopter version with four S3001 standard ball-bearing
servos
• Airplane version with no servos
• Helicopter version with no servos MA
Overview and Options
The function dial makes programming easy and fast. The included
Advanced programming options are similar to those in high-end
radios. The 7C 2.4’s digital trims can be fine-tuned for more or less
movement authority. The stick gimbals have been upgraded also.
Photos by the author
The switches have functions programmed by default but can be
assigned, such as switch G, which can be used for the triple rate
control.
Basic
• Ten-model memory
• Six-character model naming
• Dual rate/exponential
• Endpoint adjustment
• Subtrims
• Servo reversing
• Trim
• Adjustable throttle cut
• Fail-safe (for Channel 3 only)
• Trainer system
• Throttle curve normal (five points)
• Pitch curve normal (five points)
Advanced
• Three programmable mixes
• Flaperon
• Flap trim
• Air brake
• Elevator to flap
• Flap to elevator
• V-tail mixing
• Elevon mixing
• Aileron to rudder
• Ailevon mixing
• Ailevator mixing
• Snap
Helicopter
• Throttle curve (five points, Idle up 1 & 2)
• Pitch curve (five points, Idle up 1 & 2)
• Revo mixing
• Gyro
• Hovering throttle
• Hovering pitch
• Throttle hold
• Offset
• Six swashplate setups (five CCPM options)
• Governor select
• Swash-to-throttle mixing MA
Programming Features
05sig2.QXD 3/25/08 9:21 AM Page 61
62 MODEL AVIATION
Futaba 6EX, 7C, and TM-7 Service Advisory
Find out More About FASST
The standard-size S3152 digital servo has more than 70 ounces of
torque and is great for high-performance 50-size aircraft and
helicopters.
The extra-capacity 1000 mAh, 4.8-volt battery is suitable for .40-
to .50-size glow- or electric-powered models.
stick back and forth quickly on my older 7C radio, as is done while
performing a “cracked” 3-D maneuver, the stick would soon start
squeaking because of the friction and bind. The new one doesn’t do
that. In addition, the stick tensions have been factory-adjusted to be
tight—the way I like them.
Providing tight sticks shows forethought because with a new
FASST radio the stick movement is transmitted so much more
quickly that it makes the servos move instantaneously. They act
jittery in a way, but the servos are actually doing exactly what
they’re supposed to do. It means that the latency of the radio signal
is almost zero.
Futaba calls this ability “Real-Time Response,” and it’s my
favorite advantage to using digital spread spectrum technology.
A minute number of TM-7 modules and 6EX and 7C FASST
systems were incorrectly coded with a common GUID
(Globally Unique Identifier) during the manufacturing process.
If two or more units with this common identification code are
used simultaneously, they might interfere with one another.
If your FASST system has the following serial specifications,
it will not be affected.
• 6EX: All A8xxxxxxx or systems with the A7xxxxxxx serial
number which include the “I” (Inspected) sticker
• 7C: All 08xxxxxxx or systems with the 07xxxxxxx which
include the “I” (Inspected) sticker
• TM-7: All 08xxxxxx or modules with the 07xxxxxx which
include the “I” (Inspected) sticker
If you have one or more of the preceding items without the
serial-number specifications, as I did, you need to follow the
precautionary measures. Visit the Web site for more
information and to find a hobby shop in your area that can test
your system for free. If it is affected, there will be no charge to
return and fix it, and it will receive priority service upon
arrival. MA
—Michael Ramsey
Sources:
Service advisory information
http://2.4gigahertz.com/techsupport/service-advisory-tm7-7c-
6ex.html
A section on the Futaba Web site contains answers to
popular questions about Futaba’s FASST 2.4 GHz technology,
technical updates, and programming examples. And because
the 7C FASST system is so similar to the 7C on 72 MHz, the
Futaba Web site features many frequently asked questions
that are useful in learning about this radio’s advanced
programming capabilities and limitations MA
—Michael Ramsey
Sources:
FASST Technology FAQ
http://2.4gigahertz.com/faq/faq-fasst.html
General frequently asked questions
www.futaba-rc.com
What pilot wouldn’t appreciate instant control response? The
experience is equivalent to a high-speed servo upgrade or receiverbattery
exchange from a four- to five-cell pack.
I tested the 7C 2.4 GHz system in one of my most sensitive and
aerobatic foamies. Hanging the model on the propeller and holding
it in a hover can be touchy because the skill demands almost
precognitive pilot input.
The old 7C worked great, but the new system gave me the
feeling of being physically connected to the airplane. The smallest
input I gave to the transmitter stick produced an instant command to
the aircraft. The sensation enhanced my confidence as well as my
opportunity to fly more precisely.
If you ever have the chance to compare a 72 MHz system with
the new FASST radio, check out how differently the servos work. In
the 2.4 GHz unit they seem to not only move more quickly, but also
to stop and start more precisely. If the control-stick tensions were
soft, as they typically come with a new transmitter, it would be
easier to move the stick and likewise easier to overcontrol the
model.
So there you have it. I was impressed after just holding the
transmitter in my hand.
The 7C 2.4 GHz system I tested was the “full-tilt” version that
included the heavy-duty S3152 sport digital servos. The system is
also available with helicopter-friendly features, different grades of
standard servos, or no servos.
The nice thing about the S3152 servo is that it has great holding
and centering power compared with an analog servo. It is slightly
noisy and not as smooth as a digital servo with a coreless motor, but
it is hard to beat for value. I plan to use it in a 50-size helicopter.
The included receiver is the latest seven-channel, 2.4 GHz
model: the R617FS. Those of you who are Futaba savvy will notice
that this receiver is one number different from the earlier R607FS
seven-channel FASST receiver. The gurus at Futaba tell me that the
617 is a much faster-performing receiver than the 607, and that by
the time this review is printed the pricing will be the same.
05sig2.QXD 3/25/08 9:28 AM Page 62
The receiver weighs 9 grams and offers
range capabilities for any size model.
Lightweight models or foamies can save 2
grams if the user substitutes the case for
heat-shrink wrap. The included receiver is
bound to the transmitter, and the test of
binding other Futaba FASST receivers to the
system proved to be a simple matter.
During testing I mounted the receiver
with only double-stick foam tape, but in
larger models I’d wrap the unit in foam
rubber. Metal objects, batteries, and servos
should be kept at least a few inches away
from the receiver antennas.
The two short antennas should be
mounted so that they are perpendicular to
each other and should never cross. To assure
this I secured the ends of each antenna with
tape.
The “Power Down Mode” on the
transmitter electronically reduces the output
power so a static range test can be
conducted. Three indicators on the
transmitter notify the user of when this
mode is active—one on the 72 x 32-dot
LCD screen, one on the back of the
transmitter where a signal LED will flash in
red, and an audio signal that will sound
every three seconds.
Why all the warnings? It isn’t a good
idea to fly with the transmitter in this
condition.
There’s little worry about accidentally
activating this function. Once the range
check is complete, cycle the power switch
and full range is restored. As with the old
systems, the user should be able to walk 30-
50 paces away from the model with no
glitches.
As an added measure of safety, in case
the user forgets the transmitter will
automatically return to the normal output
mode after 90 seconds in the Power Down
Mode. It takes me longer than 90 seconds to
do the test anyway.
As I mentioned, I’m comfortable with
the 7C radio and its program features and
menus. I find the edit keys in combination
with the command dial easy to operate. The
menu and/or value being adjusted can be
reached as fast as the operator can rotate the
dial.
I found the setup to be oversensitive at
first, but it didn’t take long for me to adapt
and appreciate how the dial’s precision
allowed me to program more quickly. Since
using the dial I find computer radios with
only buttons to operate the programming
functions to be antiquated.
The 7C’s features are split into a Basic
and an Advanced menu. Those who are
familiar with four- to six-channel radio
systems will find that the Basic menu offers
familiar features and all the functions
needed to get an aircraft or helicopter into
the air. To tweak the model, pushing the
Mode button brings the user into the
Advanced menu, which calls up mixing
functions and wing- and tail-type options.
Pilots such as myself who fly larger
aircraft lamented that a seven-channel radio
was inadequate for use on airplanes
equipped with dual elevator servos. These
systems wouldn’t allow a mix to link a slave
channel to the master channel’s trim lever.
The only viable option was to add a
servo accessory to the model, such as the
Futaba SR-10, that would allow independent
adjustment of the two servos outside the
normal radio programming. Only high-end
radios, such as many with eight to 14
channels, accommodated this mix, but now
the sensible 7C 2.4 can fulfill this longawaited
need.
The AILEVON feature alone is enough
reason for me to want this radio. However,
the system’s setup wasn’t at all clear in the
manual. The instructions don’t mention what
channels the elevator and aileron on this mix
feature use. Look for an online FAQ and/or
manual update in the near future.
Obviously two of the four servos go into
the assigned aileron and elevator channels.
Channel 5 is used for the second elevator
servo, and channel 6 is used for the second
aileron. With that information, following the
radio menu and the manual will get the
model trimmed and ready to fly.
Jets are coming back in a big way and in
all sizes; these pilots will appreciate the
AILEVON programming feature as well. It
allows a jet with independent servos on the
elevators and ailerons to swap or share those
transmitter stick functions. The elevators can
function as ailerons and vice versa. This is a
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64 MODEL AVIATION
05sig2.QXD 3/25/08 9:28 AM Page 64
66 MODEL AVIATION
fun option to program on 3-D airplanes too.
The AILEVON mix, as can all the mixing,
can be set to be active all the time or be
switch selectable.
When digital trims first came out, it
didn’t take long for me to want nothing else.
What I like most is that every program of
the 10 available in this radio remembers
where I left the trim. I never have to center
the trim levers again unless I want to be that
fussy. What was awkward until now was
that the user didn’t have control over how
quickly the trim lever could move its
corresponding surface.
The TRIM function in the Basic menu is
used to control the trim sensitivity. On a
new model the user might want to set the
trims to have more movement per “beep” so
that the effect of those adjustments happens
more rapidly. Later the step count on the
trim can be decreased so the control can be
fine-tuned. Along with the 100 steps in the
SUB-TRIM function and the 40 steps in the
trim levers themselves, this radio can help
the user dial in a model perfectly.
The 7C’s TRAINER feature is, by
default, an inhibited function; the springloaded
switch used for that feature is
popular for other jobs. I use the springloaded
switch (SW-F) for the THROTTLE
CUT feature; that way if I bump it while
flying, killing the engine is less likely to
happen.
When a buddy box is connected, or any
compatible four-channel radio, the
functionality and mixing stored in the 7C
transmitter can be experienced through the
basic buddy box or likewise inhibited. I
could not think of a use for this detailed
feature until someone wanted to try my
airplane but I didn’t want to hand that
person my transmitter midflight.
A buddy box added a measure of safety,
and the 7C’s functionality could still be
experienced. The buddy-box pilot could
experience my EXPO and triple rates with
just the flip of a switch.
The six switches and single dial are
assignable for some applications. The
default program assignments are based on
popular demand, and I found most of them
to my liking. On 3-D and aerobatic models I
simplify the dual rate change operation by
locating the aileron, elevator, and rudder
rates on one switch instead of three.
Because I already locate my rates on one
switch, I can take advantage of the one
three-position switch (SW-D) and have
triple rates. The triple-rate feature is a vivid
example of how diverse the switch
assignments are and how personalized the
7C radio can be set up. Such features make
higher-end systems more attractive.
It’s important to remember that when the
user sets up dual rates, the rate is adjustable
on both sides of the control-stick center
point. Depending on the model’s CG
location, control input isn’t always
translated to the model’s reactions.
The pilot has to compensate by not
driving the stick harder one way than the
other. By adjusting the DUAL RATE on
both sides of the stick, the user can change
the control authority so that stick input
requirements are harmonized.
When adjusting the control throws on the
7C, the user can primarily manipulate the
amount of throw and resolution with the
endpoint (E. POINT) program. This
function’s default setting is 100% on both
sides of center, which can be increased to
140%.
That naturally permits full deflection
from the servo, but it also increases the
number of steps available to reach those
ends. The opportunity for precise servo
movement is therefore increased, which is a
bonus for precision Aerobatics pilots.
The DUAL RATE function can also be
used to control limit of throw on the aileron,
elevator, or rudder. If the E.POINT is set to
140% and the DUAL RATE is set to 140%
(which isn’t recommended but can be done),
the transmitter-stick bottom point will move
inward; the last few degrees of stick
movement won’t change the servo location.
I experienced this situation because I was
looking for every bit of travel from the servo
for a 3-D model.
If the E.POINT values are increased to
their full potential, don’t increase the DUAL
RATE value to more than 110%; that’s the
most travel you can get out of the servo and
still have full range in the control stick. The
instruction manual diagrams on page 33
05sig3.QXD 3/25/08 11:36 AM Page 66
May 2008 67
were helpful regarding the conditions of
these surface-movement features.
I’ve recognized this condition on every
computer radio I’ve used. It will be
refreshing when a radio is offered without
the issue.
Because I have used the 7C systems for a
while and am comfortable with them, the
transmitter battery gets lots of exercise.
The stock 600 mAh transmitter Ni-Cd has
lasted me only approximately an hour. To
be cautious, I stop flying when the battery
voltage drops to less than 9.6.
The typical battery drain on a 7C
FASST system is 180 mA. That’s low
compared to a 72 MHz system that drains
250 mA on average. I should be getting
more than three hours of operation, so
maybe I have a bad battery. Futaba advises
that it’s safe to operate the transmitter
when the voltmeter reads close to 9.0, so
perhaps I’m overcautious.
The good news is that I’ll never lose
my programming data. The internal
hardware uses an EEPROM (Electrically
Erasable Programmable Read-Only
Memory) chip that doesn’t need a power
source to retain data.
Now that NiMH batteries are so
popular, I’d like to see this radio equipped
with a 1100-1400 mAh transmitter pack.
The 10-model memory is almost full on
the systems I have, and it would be nice if
the transmitter battery lasted longer so I
could fly most of those models after a
single charge.
The included receiver pack is a
convenient 4.8-volt, 1000 mAh Ni-Cd pack.
If the pack drops to less than 3.8 volts
during a high-load maneuver, the receiver
will automatically recognize the battery
condition and go into fail-safe mode. By
default, the programming reduces the
throttle to idle but leaves the remaining
controls functioning so that the pilot may
guide the model to a safe landing point.
No matter what radio system is used, we,
as RC pilots, must consider a contingency.
The fail-safe feature in the 7C 2.4 operates
only on the throttle channel. Whether it’s an
aircraft or helicopter, the default fail-safe
setting may be inadequate.
Anytime a pilot programs a new model,
he or she should make sure the default
setting is satisfactory or custom-program the
fail-safe to suit. Do not skip this step, and be
sure to test its function by shutting down the
transmitter and observing the reaction of the
engine/motor.
Anyone who is looking to step up from a
four- or six-channel radio will find that the
Futaba 7C 2.4 GHz FASST system is not
just a tremendous value, but it will almost
instantly change (typically improve) his or
her talent as a pilot. That’s probably
because of the enhancement of the digital
spread spectrum technology and because
the advanced feature options and finetuning
capability will allow the pilot to
grow and improve.
The 7C system is user-ready right out of
the box, which means that anyone who is
familiar with a four- or six-channel radio will
feel comfortable and may want to use the
advanced features. The manual is fairly clear
about what the programming functions can do
and gives examples of why the feature would
be needed, which I found to be helpful.
Some of the most popular programming
features, such as flaperons and CCPM
(Cyclic Collective Pitch Mixing), are
already set; all the user has to do is
activate the feature and fine-tune the
values. High-end niceties such as the
switch assignments and feel of the gimbals
are a welcome bonus. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Great Planes Model Distributors
Box 9021
Champaign IL 61826
(217) 398-3630
www.futaba-rc.com
Other Review Sources:
Backyard Flyer, September 2007
Model Airplane News, January 2008 and
February 2008
R/C Report, March 2008
05sig3.QXD 3/25/08 11:36 AM Page 67
Edition: Model Aviation - 2008/05
Page Numbers: 60,61,62,64,66,67
Edition: Model Aviation - 2008/05
Page Numbers: 60,61,62,64,66,67
The receiver included with the 7C 2.4
weighs only 9 grams with the case. It
should be mounted at least 2 inches
away from any metal.
Power Switch: Futaba 7C 2.4 GHz Radio System
MICHAEL RAMSEY
A popular seven-channel system is finally
available with FASST sophistication
AS THERE ARE many types of RC models, there are many types of
radio systems that can meet or exceed a given project’s needs. Most of
our aircraft in the 2- to 16-pound range require a minimum of fourchannel
control, but that just gets the model flying. What if the RC pilot
wants more options?
The mainstream radio systems vary from three- to 14-channel
control. A seven-channel radio is near the middle and, in
most cases, offers the most bang for the buck. The
seven-channel units are typically better than sixchannel
radios because they offer more mixing
capability and flexible switch options.
The perception is that nine- to 14-channel radios
are overly complex, but the six- and seven-channel
radios are friendly to use. If a buyer is looking to
purchase his or her first computer radio system, a
seven-channel unit is worth every extra dollar
compared with a six-channel system.
To suit the needs of the sport pilot and many
aggressive 3-D aircraft or helicopter pilots, the
Futaba 7C has proven to be extremely popular. I
own two of the original 72 MHz versions—one for
aircraft and the other for helicopter.
I have the latter because the smooth collective
stick on the helicopter version is such a strong
benefit for holding a steady hover. The throttle’s
firm ratchet movement on the aircraft version
helps me hold the power at a constant speed more
easily when coordinating rudder input during
complex maneuvers such as Point Rolls.
The new Futaba 7C 2.4 GHz maintains most of
the programming as the still-viable 72 MHz
versions, but because it’s dedicated to the new
Futaba Advanced Spread Spectrum Technology
(FASST), it offers a dramatically improved control
feel a pilot at any skill level can appreciate. New
program features include dual elevator servos (AILEVON),
swash-throttle mix, and governor programmability. The fail-safe
programming has also been changed; I’ll include more about that later.
The new transmitter has more precise stick gimbals. If I moved the
The 7C 2.4 transmitter antenna
can rotate 180° and fold down
to 45° and 0° angles to fit easily
inside common carrying cases.
+
• Versatile features similar to high-end systems’
• Lightweight, full-range receiver
• Upgraded control sticks with firm tension
• Program dial speeds model setup
• Available with heavy-duty digital servos
• Fantastic response to pilot’s transmitter commands
• Dual elevator servo programming
-
• Instruction manual is incomplete in some
function descriptions
• Offering higher-capacity battery packs would be
a welcome benefit
Pluses and Minuses
60 MODEL AVIATION
05sig2.QXD 3/25/08 10:00 AM Page 60
May 2008 61
Overview
System (as reviewed): Futaba 7C 7-channel 2.4GHz (FUTK7000)
Pilot skill level: Intermediate to advanced
Intended usage: 2- to 16-pound aircraft or helicopter
Includes: T7C 2.4 GHz transmitter; R617FS FASST sevenchannel,
full-range receiver; 1000 mAh, 4.8-volt Ni-Cd receiver
battery; 120-volt battery charger with 70 mA transmitter output
and 100 mA receiver output; four S3152 digital high-torque
servos; 600 mAh, 9.6-volt Ni-Cd transmitter battery; switch
harness with charge cord; black transmitter neck strap; servomounting
hardware and instruction manual
Price: $349.98
Options
The 7C 2.4 GHz system is available in the following
configurations (all include the Futaba R617FS receiver):
• Airplane version with four S3152 digital high-torque servos
• Helicopter version with four S3152 digital high-torque servos
• Airplane version with four S3004 standard ball-bearing servos
• Helicopter version with four S3001 standard ball-bearing
servos
• Airplane version with no servos
• Helicopter version with no servos MA
Overview and Options
The function dial makes programming easy and fast. The included
Advanced programming options are similar to those in high-end
radios. The 7C 2.4’s digital trims can be fine-tuned for more or less
movement authority. The stick gimbals have been upgraded also.
Photos by the author
The switches have functions programmed by default but can be
assigned, such as switch G, which can be used for the triple rate
control.
Basic
• Ten-model memory
• Six-character model naming
• Dual rate/exponential
• Endpoint adjustment
• Subtrims
• Servo reversing
• Trim
• Adjustable throttle cut
• Fail-safe (for Channel 3 only)
• Trainer system
• Throttle curve normal (five points)
• Pitch curve normal (five points)
Advanced
• Three programmable mixes
• Flaperon
• Flap trim
• Air brake
• Elevator to flap
• Flap to elevator
• V-tail mixing
• Elevon mixing
• Aileron to rudder
• Ailevon mixing
• Ailevator mixing
• Snap
Helicopter
• Throttle curve (five points, Idle up 1 & 2)
• Pitch curve (five points, Idle up 1 & 2)
• Revo mixing
• Gyro
• Hovering throttle
• Hovering pitch
• Throttle hold
• Offset
• Six swashplate setups (five CCPM options)
• Governor select
• Swash-to-throttle mixing MA
Programming Features
05sig2.QXD 3/25/08 9:21 AM Page 61
62 MODEL AVIATION
Futaba 6EX, 7C, and TM-7 Service Advisory
Find out More About FASST
The standard-size S3152 digital servo has more than 70 ounces of
torque and is great for high-performance 50-size aircraft and
helicopters.
The extra-capacity 1000 mAh, 4.8-volt battery is suitable for .40-
to .50-size glow- or electric-powered models.
stick back and forth quickly on my older 7C radio, as is done while
performing a “cracked” 3-D maneuver, the stick would soon start
squeaking because of the friction and bind. The new one doesn’t do
that. In addition, the stick tensions have been factory-adjusted to be
tight—the way I like them.
Providing tight sticks shows forethought because with a new
FASST radio the stick movement is transmitted so much more
quickly that it makes the servos move instantaneously. They act
jittery in a way, but the servos are actually doing exactly what
they’re supposed to do. It means that the latency of the radio signal
is almost zero.
Futaba calls this ability “Real-Time Response,” and it’s my
favorite advantage to using digital spread spectrum technology.
A minute number of TM-7 modules and 6EX and 7C FASST
systems were incorrectly coded with a common GUID
(Globally Unique Identifier) during the manufacturing process.
If two or more units with this common identification code are
used simultaneously, they might interfere with one another.
If your FASST system has the following serial specifications,
it will not be affected.
• 6EX: All A8xxxxxxx or systems with the A7xxxxxxx serial
number which include the “I” (Inspected) sticker
• 7C: All 08xxxxxxx or systems with the 07xxxxxxx which
include the “I” (Inspected) sticker
• TM-7: All 08xxxxxx or modules with the 07xxxxxx which
include the “I” (Inspected) sticker
If you have one or more of the preceding items without the
serial-number specifications, as I did, you need to follow the
precautionary measures. Visit the Web site for more
information and to find a hobby shop in your area that can test
your system for free. If it is affected, there will be no charge to
return and fix it, and it will receive priority service upon
arrival. MA
—Michael Ramsey
Sources:
Service advisory information
http://2.4gigahertz.com/techsupport/service-advisory-tm7-7c-
6ex.html
A section on the Futaba Web site contains answers to
popular questions about Futaba’s FASST 2.4 GHz technology,
technical updates, and programming examples. And because
the 7C FASST system is so similar to the 7C on 72 MHz, the
Futaba Web site features many frequently asked questions
that are useful in learning about this radio’s advanced
programming capabilities and limitations MA
—Michael Ramsey
Sources:
FASST Technology FAQ
http://2.4gigahertz.com/faq/faq-fasst.html
General frequently asked questions
www.futaba-rc.com
What pilot wouldn’t appreciate instant control response? The
experience is equivalent to a high-speed servo upgrade or receiverbattery
exchange from a four- to five-cell pack.
I tested the 7C 2.4 GHz system in one of my most sensitive and
aerobatic foamies. Hanging the model on the propeller and holding
it in a hover can be touchy because the skill demands almost
precognitive pilot input.
The old 7C worked great, but the new system gave me the
feeling of being physically connected to the airplane. The smallest
input I gave to the transmitter stick produced an instant command to
the aircraft. The sensation enhanced my confidence as well as my
opportunity to fly more precisely.
If you ever have the chance to compare a 72 MHz system with
the new FASST radio, check out how differently the servos work. In
the 2.4 GHz unit they seem to not only move more quickly, but also
to stop and start more precisely. If the control-stick tensions were
soft, as they typically come with a new transmitter, it would be
easier to move the stick and likewise easier to overcontrol the
model.
So there you have it. I was impressed after just holding the
transmitter in my hand.
The 7C 2.4 GHz system I tested was the “full-tilt” version that
included the heavy-duty S3152 sport digital servos. The system is
also available with helicopter-friendly features, different grades of
standard servos, or no servos.
The nice thing about the S3152 servo is that it has great holding
and centering power compared with an analog servo. It is slightly
noisy and not as smooth as a digital servo with a coreless motor, but
it is hard to beat for value. I plan to use it in a 50-size helicopter.
The included receiver is the latest seven-channel, 2.4 GHz
model: the R617FS. Those of you who are Futaba savvy will notice
that this receiver is one number different from the earlier R607FS
seven-channel FASST receiver. The gurus at Futaba tell me that the
617 is a much faster-performing receiver than the 607, and that by
the time this review is printed the pricing will be the same.
05sig2.QXD 3/25/08 9:28 AM Page 62
The receiver weighs 9 grams and offers
range capabilities for any size model.
Lightweight models or foamies can save 2
grams if the user substitutes the case for
heat-shrink wrap. The included receiver is
bound to the transmitter, and the test of
binding other Futaba FASST receivers to the
system proved to be a simple matter.
During testing I mounted the receiver
with only double-stick foam tape, but in
larger models I’d wrap the unit in foam
rubber. Metal objects, batteries, and servos
should be kept at least a few inches away
from the receiver antennas.
The two short antennas should be
mounted so that they are perpendicular to
each other and should never cross. To assure
this I secured the ends of each antenna with
tape.
The “Power Down Mode” on the
transmitter electronically reduces the output
power so a static range test can be
conducted. Three indicators on the
transmitter notify the user of when this
mode is active—one on the 72 x 32-dot
LCD screen, one on the back of the
transmitter where a signal LED will flash in
red, and an audio signal that will sound
every three seconds.
Why all the warnings? It isn’t a good
idea to fly with the transmitter in this
condition.
There’s little worry about accidentally
activating this function. Once the range
check is complete, cycle the power switch
and full range is restored. As with the old
systems, the user should be able to walk 30-
50 paces away from the model with no
glitches.
As an added measure of safety, in case
the user forgets the transmitter will
automatically return to the normal output
mode after 90 seconds in the Power Down
Mode. It takes me longer than 90 seconds to
do the test anyway.
As I mentioned, I’m comfortable with
the 7C radio and its program features and
menus. I find the edit keys in combination
with the command dial easy to operate. The
menu and/or value being adjusted can be
reached as fast as the operator can rotate the
dial.
I found the setup to be oversensitive at
first, but it didn’t take long for me to adapt
and appreciate how the dial’s precision
allowed me to program more quickly. Since
using the dial I find computer radios with
only buttons to operate the programming
functions to be antiquated.
The 7C’s features are split into a Basic
and an Advanced menu. Those who are
familiar with four- to six-channel radio
systems will find that the Basic menu offers
familiar features and all the functions
needed to get an aircraft or helicopter into
the air. To tweak the model, pushing the
Mode button brings the user into the
Advanced menu, which calls up mixing
functions and wing- and tail-type options.
Pilots such as myself who fly larger
aircraft lamented that a seven-channel radio
was inadequate for use on airplanes
equipped with dual elevator servos. These
systems wouldn’t allow a mix to link a slave
channel to the master channel’s trim lever.
The only viable option was to add a
servo accessory to the model, such as the
Futaba SR-10, that would allow independent
adjustment of the two servos outside the
normal radio programming. Only high-end
radios, such as many with eight to 14
channels, accommodated this mix, but now
the sensible 7C 2.4 can fulfill this longawaited
need.
The AILEVON feature alone is enough
reason for me to want this radio. However,
the system’s setup wasn’t at all clear in the
manual. The instructions don’t mention what
channels the elevator and aileron on this mix
feature use. Look for an online FAQ and/or
manual update in the near future.
Obviously two of the four servos go into
the assigned aileron and elevator channels.
Channel 5 is used for the second elevator
servo, and channel 6 is used for the second
aileron. With that information, following the
radio menu and the manual will get the
model trimmed and ready to fly.
Jets are coming back in a big way and in
all sizes; these pilots will appreciate the
AILEVON programming feature as well. It
allows a jet with independent servos on the
elevators and ailerons to swap or share those
transmitter stick functions. The elevators can
function as ailerons and vice versa. This is a
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64 MODEL AVIATION
05sig2.QXD 3/25/08 9:28 AM Page 64
66 MODEL AVIATION
fun option to program on 3-D airplanes too.
The AILEVON mix, as can all the mixing,
can be set to be active all the time or be
switch selectable.
When digital trims first came out, it
didn’t take long for me to want nothing else.
What I like most is that every program of
the 10 available in this radio remembers
where I left the trim. I never have to center
the trim levers again unless I want to be that
fussy. What was awkward until now was
that the user didn’t have control over how
quickly the trim lever could move its
corresponding surface.
The TRIM function in the Basic menu is
used to control the trim sensitivity. On a
new model the user might want to set the
trims to have more movement per “beep” so
that the effect of those adjustments happens
more rapidly. Later the step count on the
trim can be decreased so the control can be
fine-tuned. Along with the 100 steps in the
SUB-TRIM function and the 40 steps in the
trim levers themselves, this radio can help
the user dial in a model perfectly.
The 7C’s TRAINER feature is, by
default, an inhibited function; the springloaded
switch used for that feature is
popular for other jobs. I use the springloaded
switch (SW-F) for the THROTTLE
CUT feature; that way if I bump it while
flying, killing the engine is less likely to
happen.
When a buddy box is connected, or any
compatible four-channel radio, the
functionality and mixing stored in the 7C
transmitter can be experienced through the
basic buddy box or likewise inhibited. I
could not think of a use for this detailed
feature until someone wanted to try my
airplane but I didn’t want to hand that
person my transmitter midflight.
A buddy box added a measure of safety,
and the 7C’s functionality could still be
experienced. The buddy-box pilot could
experience my EXPO and triple rates with
just the flip of a switch.
The six switches and single dial are
assignable for some applications. The
default program assignments are based on
popular demand, and I found most of them
to my liking. On 3-D and aerobatic models I
simplify the dual rate change operation by
locating the aileron, elevator, and rudder
rates on one switch instead of three.
Because I already locate my rates on one
switch, I can take advantage of the one
three-position switch (SW-D) and have
triple rates. The triple-rate feature is a vivid
example of how diverse the switch
assignments are and how personalized the
7C radio can be set up. Such features make
higher-end systems more attractive.
It’s important to remember that when the
user sets up dual rates, the rate is adjustable
on both sides of the control-stick center
point. Depending on the model’s CG
location, control input isn’t always
translated to the model’s reactions.
The pilot has to compensate by not
driving the stick harder one way than the
other. By adjusting the DUAL RATE on
both sides of the stick, the user can change
the control authority so that stick input
requirements are harmonized.
When adjusting the control throws on the
7C, the user can primarily manipulate the
amount of throw and resolution with the
endpoint (E. POINT) program. This
function’s default setting is 100% on both
sides of center, which can be increased to
140%.
That naturally permits full deflection
from the servo, but it also increases the
number of steps available to reach those
ends. The opportunity for precise servo
movement is therefore increased, which is a
bonus for precision Aerobatics pilots.
The DUAL RATE function can also be
used to control limit of throw on the aileron,
elevator, or rudder. If the E.POINT is set to
140% and the DUAL RATE is set to 140%
(which isn’t recommended but can be done),
the transmitter-stick bottom point will move
inward; the last few degrees of stick
movement won’t change the servo location.
I experienced this situation because I was
looking for every bit of travel from the servo
for a 3-D model.
If the E.POINT values are increased to
their full potential, don’t increase the DUAL
RATE value to more than 110%; that’s the
most travel you can get out of the servo and
still have full range in the control stick. The
instruction manual diagrams on page 33
05sig3.QXD 3/25/08 11:36 AM Page 66
May 2008 67
were helpful regarding the conditions of
these surface-movement features.
I’ve recognized this condition on every
computer radio I’ve used. It will be
refreshing when a radio is offered without
the issue.
Because I have used the 7C systems for a
while and am comfortable with them, the
transmitter battery gets lots of exercise.
The stock 600 mAh transmitter Ni-Cd has
lasted me only approximately an hour. To
be cautious, I stop flying when the battery
voltage drops to less than 9.6.
The typical battery drain on a 7C
FASST system is 180 mA. That’s low
compared to a 72 MHz system that drains
250 mA on average. I should be getting
more than three hours of operation, so
maybe I have a bad battery. Futaba advises
that it’s safe to operate the transmitter
when the voltmeter reads close to 9.0, so
perhaps I’m overcautious.
The good news is that I’ll never lose
my programming data. The internal
hardware uses an EEPROM (Electrically
Erasable Programmable Read-Only
Memory) chip that doesn’t need a power
source to retain data.
Now that NiMH batteries are so
popular, I’d like to see this radio equipped
with a 1100-1400 mAh transmitter pack.
The 10-model memory is almost full on
the systems I have, and it would be nice if
the transmitter battery lasted longer so I
could fly most of those models after a
single charge.
The included receiver pack is a
convenient 4.8-volt, 1000 mAh Ni-Cd pack.
If the pack drops to less than 3.8 volts
during a high-load maneuver, the receiver
will automatically recognize the battery
condition and go into fail-safe mode. By
default, the programming reduces the
throttle to idle but leaves the remaining
controls functioning so that the pilot may
guide the model to a safe landing point.
No matter what radio system is used, we,
as RC pilots, must consider a contingency.
The fail-safe feature in the 7C 2.4 operates
only on the throttle channel. Whether it’s an
aircraft or helicopter, the default fail-safe
setting may be inadequate.
Anytime a pilot programs a new model,
he or she should make sure the default
setting is satisfactory or custom-program the
fail-safe to suit. Do not skip this step, and be
sure to test its function by shutting down the
transmitter and observing the reaction of the
engine/motor.
Anyone who is looking to step up from a
four- or six-channel radio will find that the
Futaba 7C 2.4 GHz FASST system is not
just a tremendous value, but it will almost
instantly change (typically improve) his or
her talent as a pilot. That’s probably
because of the enhancement of the digital
spread spectrum technology and because
the advanced feature options and finetuning
capability will allow the pilot to
grow and improve.
The 7C system is user-ready right out of
the box, which means that anyone who is
familiar with a four- or six-channel radio will
feel comfortable and may want to use the
advanced features. The manual is fairly clear
about what the programming functions can do
and gives examples of why the feature would
be needed, which I found to be helpful.
Some of the most popular programming
features, such as flaperons and CCPM
(Cyclic Collective Pitch Mixing), are
already set; all the user has to do is
activate the feature and fine-tune the
values. High-end niceties such as the
switch assignments and feel of the gimbals
are a welcome bonus. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Great Planes Model Distributors
Box 9021
Champaign IL 61826
(217) 398-3630
www.futaba-rc.com
Other Review Sources:
Backyard Flyer, September 2007
Model Airplane News, January 2008 and
February 2008
R/C Report, March 2008
05sig3.QXD 3/25/08 11:36 AM Page 67
Edition: Model Aviation - 2008/05
Page Numbers: 60,61,62,64,66,67
The receiver included with the 7C 2.4
weighs only 9 grams with the case. It
should be mounted at least 2 inches
away from any metal.
Power Switch: Futaba 7C 2.4 GHz Radio System
MICHAEL RAMSEY
A popular seven-channel system is finally
available with FASST sophistication
AS THERE ARE many types of RC models, there are many types of
radio systems that can meet or exceed a given project’s needs. Most of
our aircraft in the 2- to 16-pound range require a minimum of fourchannel
control, but that just gets the model flying. What if the RC pilot
wants more options?
The mainstream radio systems vary from three- to 14-channel
control. A seven-channel radio is near the middle and, in
most cases, offers the most bang for the buck. The
seven-channel units are typically better than sixchannel
radios because they offer more mixing
capability and flexible switch options.
The perception is that nine- to 14-channel radios
are overly complex, but the six- and seven-channel
radios are friendly to use. If a buyer is looking to
purchase his or her first computer radio system, a
seven-channel unit is worth every extra dollar
compared with a six-channel system.
To suit the needs of the sport pilot and many
aggressive 3-D aircraft or helicopter pilots, the
Futaba 7C has proven to be extremely popular. I
own two of the original 72 MHz versions—one for
aircraft and the other for helicopter.
I have the latter because the smooth collective
stick on the helicopter version is such a strong
benefit for holding a steady hover. The throttle’s
firm ratchet movement on the aircraft version
helps me hold the power at a constant speed more
easily when coordinating rudder input during
complex maneuvers such as Point Rolls.
The new Futaba 7C 2.4 GHz maintains most of
the programming as the still-viable 72 MHz
versions, but because it’s dedicated to the new
Futaba Advanced Spread Spectrum Technology
(FASST), it offers a dramatically improved control
feel a pilot at any skill level can appreciate. New
program features include dual elevator servos (AILEVON),
swash-throttle mix, and governor programmability. The fail-safe
programming has also been changed; I’ll include more about that later.
The new transmitter has more precise stick gimbals. If I moved the
The 7C 2.4 transmitter antenna
can rotate 180° and fold down
to 45° and 0° angles to fit easily
inside common carrying cases.
+
• Versatile features similar to high-end systems’
• Lightweight, full-range receiver
• Upgraded control sticks with firm tension
• Program dial speeds model setup
• Available with heavy-duty digital servos
• Fantastic response to pilot’s transmitter commands
• Dual elevator servo programming
-
• Instruction manual is incomplete in some
function descriptions
• Offering higher-capacity battery packs would be
a welcome benefit
Pluses and Minuses
60 MODEL AVIATION
05sig2.QXD 3/25/08 10:00 AM Page 60
May 2008 61
Overview
System (as reviewed): Futaba 7C 7-channel 2.4GHz (FUTK7000)
Pilot skill level: Intermediate to advanced
Intended usage: 2- to 16-pound aircraft or helicopter
Includes: T7C 2.4 GHz transmitter; R617FS FASST sevenchannel,
full-range receiver; 1000 mAh, 4.8-volt Ni-Cd receiver
battery; 120-volt battery charger with 70 mA transmitter output
and 100 mA receiver output; four S3152 digital high-torque
servos; 600 mAh, 9.6-volt Ni-Cd transmitter battery; switch
harness with charge cord; black transmitter neck strap; servomounting
hardware and instruction manual
Price: $349.98
Options
The 7C 2.4 GHz system is available in the following
configurations (all include the Futaba R617FS receiver):
• Airplane version with four S3152 digital high-torque servos
• Helicopter version with four S3152 digital high-torque servos
• Airplane version with four S3004 standard ball-bearing servos
• Helicopter version with four S3001 standard ball-bearing
servos
• Airplane version with no servos
• Helicopter version with no servos MA
Overview and Options
The function dial makes programming easy and fast. The included
Advanced programming options are similar to those in high-end
radios. The 7C 2.4’s digital trims can be fine-tuned for more or less
movement authority. The stick gimbals have been upgraded also.
Photos by the author
The switches have functions programmed by default but can be
assigned, such as switch G, which can be used for the triple rate
control.
Basic
• Ten-model memory
• Six-character model naming
• Dual rate/exponential
• Endpoint adjustment
• Subtrims
• Servo reversing
• Trim
• Adjustable throttle cut
• Fail-safe (for Channel 3 only)
• Trainer system
• Throttle curve normal (five points)
• Pitch curve normal (five points)
Advanced
• Three programmable mixes
• Flaperon
• Flap trim
• Air brake
• Elevator to flap
• Flap to elevator
• V-tail mixing
• Elevon mixing
• Aileron to rudder
• Ailevon mixing
• Ailevator mixing
• Snap
Helicopter
• Throttle curve (five points, Idle up 1 & 2)
• Pitch curve (five points, Idle up 1 & 2)
• Revo mixing
• Gyro
• Hovering throttle
• Hovering pitch
• Throttle hold
• Offset
• Six swashplate setups (five CCPM options)
• Governor select
• Swash-to-throttle mixing MA
Programming Features
05sig2.QXD 3/25/08 9:21 AM Page 61
62 MODEL AVIATION
Futaba 6EX, 7C, and TM-7 Service Advisory
Find out More About FASST
The standard-size S3152 digital servo has more than 70 ounces of
torque and is great for high-performance 50-size aircraft and
helicopters.
The extra-capacity 1000 mAh, 4.8-volt battery is suitable for .40-
to .50-size glow- or electric-powered models.
stick back and forth quickly on my older 7C radio, as is done while
performing a “cracked” 3-D maneuver, the stick would soon start
squeaking because of the friction and bind. The new one doesn’t do
that. In addition, the stick tensions have been factory-adjusted to be
tight—the way I like them.
Providing tight sticks shows forethought because with a new
FASST radio the stick movement is transmitted so much more
quickly that it makes the servos move instantaneously. They act
jittery in a way, but the servos are actually doing exactly what
they’re supposed to do. It means that the latency of the radio signal
is almost zero.
Futaba calls this ability “Real-Time Response,” and it’s my
favorite advantage to using digital spread spectrum technology.
A minute number of TM-7 modules and 6EX and 7C FASST
systems were incorrectly coded with a common GUID
(Globally Unique Identifier) during the manufacturing process.
If two or more units with this common identification code are
used simultaneously, they might interfere with one another.
If your FASST system has the following serial specifications,
it will not be affected.
• 6EX: All A8xxxxxxx or systems with the A7xxxxxxx serial
number which include the “I” (Inspected) sticker
• 7C: All 08xxxxxxx or systems with the 07xxxxxxx which
include the “I” (Inspected) sticker
• TM-7: All 08xxxxxx or modules with the 07xxxxxx which
include the “I” (Inspected) sticker
If you have one or more of the preceding items without the
serial-number specifications, as I did, you need to follow the
precautionary measures. Visit the Web site for more
information and to find a hobby shop in your area that can test
your system for free. If it is affected, there will be no charge to
return and fix it, and it will receive priority service upon
arrival. MA
—Michael Ramsey
Sources:
Service advisory information
http://2.4gigahertz.com/techsupport/service-advisory-tm7-7c-
6ex.html
A section on the Futaba Web site contains answers to
popular questions about Futaba’s FASST 2.4 GHz technology,
technical updates, and programming examples. And because
the 7C FASST system is so similar to the 7C on 72 MHz, the
Futaba Web site features many frequently asked questions
that are useful in learning about this radio’s advanced
programming capabilities and limitations MA
—Michael Ramsey
Sources:
FASST Technology FAQ
http://2.4gigahertz.com/faq/faq-fasst.html
General frequently asked questions
www.futaba-rc.com
What pilot wouldn’t appreciate instant control response? The
experience is equivalent to a high-speed servo upgrade or receiverbattery
exchange from a four- to five-cell pack.
I tested the 7C 2.4 GHz system in one of my most sensitive and
aerobatic foamies. Hanging the model on the propeller and holding
it in a hover can be touchy because the skill demands almost
precognitive pilot input.
The old 7C worked great, but the new system gave me the
feeling of being physically connected to the airplane. The smallest
input I gave to the transmitter stick produced an instant command to
the aircraft. The sensation enhanced my confidence as well as my
opportunity to fly more precisely.
If you ever have the chance to compare a 72 MHz system with
the new FASST radio, check out how differently the servos work. In
the 2.4 GHz unit they seem to not only move more quickly, but also
to stop and start more precisely. If the control-stick tensions were
soft, as they typically come with a new transmitter, it would be
easier to move the stick and likewise easier to overcontrol the
model.
So there you have it. I was impressed after just holding the
transmitter in my hand.
The 7C 2.4 GHz system I tested was the “full-tilt” version that
included the heavy-duty S3152 sport digital servos. The system is
also available with helicopter-friendly features, different grades of
standard servos, or no servos.
The nice thing about the S3152 servo is that it has great holding
and centering power compared with an analog servo. It is slightly
noisy and not as smooth as a digital servo with a coreless motor, but
it is hard to beat for value. I plan to use it in a 50-size helicopter.
The included receiver is the latest seven-channel, 2.4 GHz
model: the R617FS. Those of you who are Futaba savvy will notice
that this receiver is one number different from the earlier R607FS
seven-channel FASST receiver. The gurus at Futaba tell me that the
617 is a much faster-performing receiver than the 607, and that by
the time this review is printed the pricing will be the same.
05sig2.QXD 3/25/08 9:28 AM Page 62
The receiver weighs 9 grams and offers
range capabilities for any size model.
Lightweight models or foamies can save 2
grams if the user substitutes the case for
heat-shrink wrap. The included receiver is
bound to the transmitter, and the test of
binding other Futaba FASST receivers to the
system proved to be a simple matter.
During testing I mounted the receiver
with only double-stick foam tape, but in
larger models I’d wrap the unit in foam
rubber. Metal objects, batteries, and servos
should be kept at least a few inches away
from the receiver antennas.
The two short antennas should be
mounted so that they are perpendicular to
each other and should never cross. To assure
this I secured the ends of each antenna with
tape.
The “Power Down Mode” on the
transmitter electronically reduces the output
power so a static range test can be
conducted. Three indicators on the
transmitter notify the user of when this
mode is active—one on the 72 x 32-dot
LCD screen, one on the back of the
transmitter where a signal LED will flash in
red, and an audio signal that will sound
every three seconds.
Why all the warnings? It isn’t a good
idea to fly with the transmitter in this
condition.
There’s little worry about accidentally
activating this function. Once the range
check is complete, cycle the power switch
and full range is restored. As with the old
systems, the user should be able to walk 30-
50 paces away from the model with no
glitches.
As an added measure of safety, in case
the user forgets the transmitter will
automatically return to the normal output
mode after 90 seconds in the Power Down
Mode. It takes me longer than 90 seconds to
do the test anyway.
As I mentioned, I’m comfortable with
the 7C radio and its program features and
menus. I find the edit keys in combination
with the command dial easy to operate. The
menu and/or value being adjusted can be
reached as fast as the operator can rotate the
dial.
I found the setup to be oversensitive at
first, but it didn’t take long for me to adapt
and appreciate how the dial’s precision
allowed me to program more quickly. Since
using the dial I find computer radios with
only buttons to operate the programming
functions to be antiquated.
The 7C’s features are split into a Basic
and an Advanced menu. Those who are
familiar with four- to six-channel radio
systems will find that the Basic menu offers
familiar features and all the functions
needed to get an aircraft or helicopter into
the air. To tweak the model, pushing the
Mode button brings the user into the
Advanced menu, which calls up mixing
functions and wing- and tail-type options.
Pilots such as myself who fly larger
aircraft lamented that a seven-channel radio
was inadequate for use on airplanes
equipped with dual elevator servos. These
systems wouldn’t allow a mix to link a slave
channel to the master channel’s trim lever.
The only viable option was to add a
servo accessory to the model, such as the
Futaba SR-10, that would allow independent
adjustment of the two servos outside the
normal radio programming. Only high-end
radios, such as many with eight to 14
channels, accommodated this mix, but now
the sensible 7C 2.4 can fulfill this longawaited
need.
The AILEVON feature alone is enough
reason for me to want this radio. However,
the system’s setup wasn’t at all clear in the
manual. The instructions don’t mention what
channels the elevator and aileron on this mix
feature use. Look for an online FAQ and/or
manual update in the near future.
Obviously two of the four servos go into
the assigned aileron and elevator channels.
Channel 5 is used for the second elevator
servo, and channel 6 is used for the second
aileron. With that information, following the
radio menu and the manual will get the
model trimmed and ready to fly.
Jets are coming back in a big way and in
all sizes; these pilots will appreciate the
AILEVON programming feature as well. It
allows a jet with independent servos on the
elevators and ailerons to swap or share those
transmitter stick functions. The elevators can
function as ailerons and vice versa. This is a
Tru-Turn now offers 2 Spinners made to fit the new ARF P-51’s from Hangar 9.
A 3-1/2” P-51 Spinner for the .60 P-51 ARF and a 5” P-51 Spinner for the 77”,
1.50 P-51 ARF – Available in 2, 3 & 4-blade prop slots!
The 3-1/2” is available in our “120-Slot” for your 4-stroke. The 5” is also
available in our “Menz Cut” for your euro props up to 28” diameter!
Browse our website to see these new items today! Use our Adapter
Finder™ online to find the right Adapter Kit for your engine, then:
See your Hobby Dealer or contact Tru-Turn direct!
281-479-9600 www.tru-turn.com
Made in the U.S.A.
by Romco Manufacturing, Inc.
100 West First Street, Deer Park, Texas 77536
PRECISION MODEL PRODUCTS
P-51 SPINNERS FOR YOUR
HANGAR-9 ARF Tru-Turn makes 11
sizes of P-51 Spinners
to suit your needs!
64 MODEL AVIATION
05sig2.QXD 3/25/08 9:28 AM Page 64
66 MODEL AVIATION
fun option to program on 3-D airplanes too.
The AILEVON mix, as can all the mixing,
can be set to be active all the time or be
switch selectable.
When digital trims first came out, it
didn’t take long for me to want nothing else.
What I like most is that every program of
the 10 available in this radio remembers
where I left the trim. I never have to center
the trim levers again unless I want to be that
fussy. What was awkward until now was
that the user didn’t have control over how
quickly the trim lever could move its
corresponding surface.
The TRIM function in the Basic menu is
used to control the trim sensitivity. On a
new model the user might want to set the
trims to have more movement per “beep” so
that the effect of those adjustments happens
more rapidly. Later the step count on the
trim can be decreased so the control can be
fine-tuned. Along with the 100 steps in the
SUB-TRIM function and the 40 steps in the
trim levers themselves, this radio can help
the user dial in a model perfectly.
The 7C’s TRAINER feature is, by
default, an inhibited function; the springloaded
switch used for that feature is
popular for other jobs. I use the springloaded
switch (SW-F) for the THROTTLE
CUT feature; that way if I bump it while
flying, killing the engine is less likely to
happen.
When a buddy box is connected, or any
compatible four-channel radio, the
functionality and mixing stored in the 7C
transmitter can be experienced through the
basic buddy box or likewise inhibited. I
could not think of a use for this detailed
feature until someone wanted to try my
airplane but I didn’t want to hand that
person my transmitter midflight.
A buddy box added a measure of safety,
and the 7C’s functionality could still be
experienced. The buddy-box pilot could
experience my EXPO and triple rates with
just the flip of a switch.
The six switches and single dial are
assignable for some applications. The
default program assignments are based on
popular demand, and I found most of them
to my liking. On 3-D and aerobatic models I
simplify the dual rate change operation by
locating the aileron, elevator, and rudder
rates on one switch instead of three.
Because I already locate my rates on one
switch, I can take advantage of the one
three-position switch (SW-D) and have
triple rates. The triple-rate feature is a vivid
example of how diverse the switch
assignments are and how personalized the
7C radio can be set up. Such features make
higher-end systems more attractive.
It’s important to remember that when the
user sets up dual rates, the rate is adjustable
on both sides of the control-stick center
point. Depending on the model’s CG
location, control input isn’t always
translated to the model’s reactions.
The pilot has to compensate by not
driving the stick harder one way than the
other. By adjusting the DUAL RATE on
both sides of the stick, the user can change
the control authority so that stick input
requirements are harmonized.
When adjusting the control throws on the
7C, the user can primarily manipulate the
amount of throw and resolution with the
endpoint (E. POINT) program. This
function’s default setting is 100% on both
sides of center, which can be increased to
140%.
That naturally permits full deflection
from the servo, but it also increases the
number of steps available to reach those
ends. The opportunity for precise servo
movement is therefore increased, which is a
bonus for precision Aerobatics pilots.
The DUAL RATE function can also be
used to control limit of throw on the aileron,
elevator, or rudder. If the E.POINT is set to
140% and the DUAL RATE is set to 140%
(which isn’t recommended but can be done),
the transmitter-stick bottom point will move
inward; the last few degrees of stick
movement won’t change the servo location.
I experienced this situation because I was
looking for every bit of travel from the servo
for a 3-D model.
If the E.POINT values are increased to
their full potential, don’t increase the DUAL
RATE value to more than 110%; that’s the
most travel you can get out of the servo and
still have full range in the control stick. The
instruction manual diagrams on page 33
05sig3.QXD 3/25/08 11:36 AM Page 66
May 2008 67
were helpful regarding the conditions of
these surface-movement features.
I’ve recognized this condition on every
computer radio I’ve used. It will be
refreshing when a radio is offered without
the issue.
Because I have used the 7C systems for a
while and am comfortable with them, the
transmitter battery gets lots of exercise.
The stock 600 mAh transmitter Ni-Cd has
lasted me only approximately an hour. To
be cautious, I stop flying when the battery
voltage drops to less than 9.6.
The typical battery drain on a 7C
FASST system is 180 mA. That’s low
compared to a 72 MHz system that drains
250 mA on average. I should be getting
more than three hours of operation, so
maybe I have a bad battery. Futaba advises
that it’s safe to operate the transmitter
when the voltmeter reads close to 9.0, so
perhaps I’m overcautious.
The good news is that I’ll never lose
my programming data. The internal
hardware uses an EEPROM (Electrically
Erasable Programmable Read-Only
Memory) chip that doesn’t need a power
source to retain data.
Now that NiMH batteries are so
popular, I’d like to see this radio equipped
with a 1100-1400 mAh transmitter pack.
The 10-model memory is almost full on
the systems I have, and it would be nice if
the transmitter battery lasted longer so I
could fly most of those models after a
single charge.
The included receiver pack is a
convenient 4.8-volt, 1000 mAh Ni-Cd pack.
If the pack drops to less than 3.8 volts
during a high-load maneuver, the receiver
will automatically recognize the battery
condition and go into fail-safe mode. By
default, the programming reduces the
throttle to idle but leaves the remaining
controls functioning so that the pilot may
guide the model to a safe landing point.
No matter what radio system is used, we,
as RC pilots, must consider a contingency.
The fail-safe feature in the 7C 2.4 operates
only on the throttle channel. Whether it’s an
aircraft or helicopter, the default fail-safe
setting may be inadequate.
Anytime a pilot programs a new model,
he or she should make sure the default
setting is satisfactory or custom-program the
fail-safe to suit. Do not skip this step, and be
sure to test its function by shutting down the
transmitter and observing the reaction of the
engine/motor.
Anyone who is looking to step up from a
four- or six-channel radio will find that the
Futaba 7C 2.4 GHz FASST system is not
just a tremendous value, but it will almost
instantly change (typically improve) his or
her talent as a pilot. That’s probably
because of the enhancement of the digital
spread spectrum technology and because
the advanced feature options and finetuning
capability will allow the pilot to
grow and improve.
The 7C system is user-ready right out of
the box, which means that anyone who is
familiar with a four- or six-channel radio will
feel comfortable and may want to use the
advanced features. The manual is fairly clear
about what the programming functions can do
and gives examples of why the feature would
be needed, which I found to be helpful.
Some of the most popular programming
features, such as flaperons and CCPM
(Cyclic Collective Pitch Mixing), are
already set; all the user has to do is
activate the feature and fine-tune the
values. High-end niceties such as the
switch assignments and feel of the gimbals
are a welcome bonus. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Great Planes Model Distributors
Box 9021
Champaign IL 61826
(217) 398-3630
www.futaba-rc.com
Other Review Sources:
Backyard Flyer, September 2007
Model Airplane News, January 2008 and
February 2008
R/C Report, March 2008
05sig3.QXD 3/25/08 11:36 AM Page 67
Edition: Model Aviation - 2008/05
Page Numbers: 60,61,62,64,66,67
The receiver included with the 7C 2.4
weighs only 9 grams with the case. It
should be mounted at least 2 inches
away from any metal.
Power Switch: Futaba 7C 2.4 GHz Radio System
MICHAEL RAMSEY
A popular seven-channel system is finally
available with FASST sophistication
AS THERE ARE many types of RC models, there are many types of
radio systems that can meet or exceed a given project’s needs. Most of
our aircraft in the 2- to 16-pound range require a minimum of fourchannel
control, but that just gets the model flying. What if the RC pilot
wants more options?
The mainstream radio systems vary from three- to 14-channel
control. A seven-channel radio is near the middle and, in
most cases, offers the most bang for the buck. The
seven-channel units are typically better than sixchannel
radios because they offer more mixing
capability and flexible switch options.
The perception is that nine- to 14-channel radios
are overly complex, but the six- and seven-channel
radios are friendly to use. If a buyer is looking to
purchase his or her first computer radio system, a
seven-channel unit is worth every extra dollar
compared with a six-channel system.
To suit the needs of the sport pilot and many
aggressive 3-D aircraft or helicopter pilots, the
Futaba 7C has proven to be extremely popular. I
own two of the original 72 MHz versions—one for
aircraft and the other for helicopter.
I have the latter because the smooth collective
stick on the helicopter version is such a strong
benefit for holding a steady hover. The throttle’s
firm ratchet movement on the aircraft version
helps me hold the power at a constant speed more
easily when coordinating rudder input during
complex maneuvers such as Point Rolls.
The new Futaba 7C 2.4 GHz maintains most of
the programming as the still-viable 72 MHz
versions, but because it’s dedicated to the new
Futaba Advanced Spread Spectrum Technology
(FASST), it offers a dramatically improved control
feel a pilot at any skill level can appreciate. New
program features include dual elevator servos (AILEVON),
swash-throttle mix, and governor programmability. The fail-safe
programming has also been changed; I’ll include more about that later.
The new transmitter has more precise stick gimbals. If I moved the
The 7C 2.4 transmitter antenna
can rotate 180° and fold down
to 45° and 0° angles to fit easily
inside common carrying cases.
+
• Versatile features similar to high-end systems’
• Lightweight, full-range receiver
• Upgraded control sticks with firm tension
• Program dial speeds model setup
• Available with heavy-duty digital servos
• Fantastic response to pilot’s transmitter commands
• Dual elevator servo programming
-
• Instruction manual is incomplete in some
function descriptions
• Offering higher-capacity battery packs would be
a welcome benefit
Pluses and Minuses
60 MODEL AVIATION
05sig2.QXD 3/25/08 10:00 AM Page 60
May 2008 61
Overview
System (as reviewed): Futaba 7C 7-channel 2.4GHz (FUTK7000)
Pilot skill level: Intermediate to advanced
Intended usage: 2- to 16-pound aircraft or helicopter
Includes: T7C 2.4 GHz transmitter; R617FS FASST sevenchannel,
full-range receiver; 1000 mAh, 4.8-volt Ni-Cd receiver
battery; 120-volt battery charger with 70 mA transmitter output
and 100 mA receiver output; four S3152 digital high-torque
servos; 600 mAh, 9.6-volt Ni-Cd transmitter battery; switch
harness with charge cord; black transmitter neck strap; servomounting
hardware and instruction manual
Price: $349.98
Options
The 7C 2.4 GHz system is available in the following
configurations (all include the Futaba R617FS receiver):
• Airplane version with four S3152 digital high-torque servos
• Helicopter version with four S3152 digital high-torque servos
• Airplane version with four S3004 standard ball-bearing servos
• Helicopter version with four S3001 standard ball-bearing
servos
• Airplane version with no servos
• Helicopter version with no servos MA
Overview and Options
The function dial makes programming easy and fast. The included
Advanced programming options are similar to those in high-end
radios. The 7C 2.4’s digital trims can be fine-tuned for more or less
movement authority. The stick gimbals have been upgraded also.
Photos by the author
The switches have functions programmed by default but can be
assigned, such as switch G, which can be used for the triple rate
control.
Basic
• Ten-model memory
• Six-character model naming
• Dual rate/exponential
• Endpoint adjustment
• Subtrims
• Servo reversing
• Trim
• Adjustable throttle cut
• Fail-safe (for Channel 3 only)
• Trainer system
• Throttle curve normal (five points)
• Pitch curve normal (five points)
Advanced
• Three programmable mixes
• Flaperon
• Flap trim
• Air brake
• Elevator to flap
• Flap to elevator
• V-tail mixing
• Elevon mixing
• Aileron to rudder
• Ailevon mixing
• Ailevator mixing
• Snap
Helicopter
• Throttle curve (five points, Idle up 1 & 2)
• Pitch curve (five points, Idle up 1 & 2)
• Revo mixing
• Gyro
• Hovering throttle
• Hovering pitch
• Throttle hold
• Offset
• Six swashplate setups (five CCPM options)
• Governor select
• Swash-to-throttle mixing MA
Programming Features
05sig2.QXD 3/25/08 9:21 AM Page 61
62 MODEL AVIATION
Futaba 6EX, 7C, and TM-7 Service Advisory
Find out More About FASST
The standard-size S3152 digital servo has more than 70 ounces of
torque and is great for high-performance 50-size aircraft and
helicopters.
The extra-capacity 1000 mAh, 4.8-volt battery is suitable for .40-
to .50-size glow- or electric-powered models.
stick back and forth quickly on my older 7C radio, as is done while
performing a “cracked” 3-D maneuver, the stick would soon start
squeaking because of the friction and bind. The new one doesn’t do
that. In addition, the stick tensions have been factory-adjusted to be
tight—the way I like them.
Providing tight sticks shows forethought because with a new
FASST radio the stick movement is transmitted so much more
quickly that it makes the servos move instantaneously. They act
jittery in a way, but the servos are actually doing exactly what
they’re supposed to do. It means that the latency of the radio signal
is almost zero.
Futaba calls this ability “Real-Time Response,” and it’s my
favorite advantage to using digital spread spectrum technology.
A minute number of TM-7 modules and 6EX and 7C FASST
systems were incorrectly coded with a common GUID
(Globally Unique Identifier) during the manufacturing process.
If two or more units with this common identification code are
used simultaneously, they might interfere with one another.
If your FASST system has the following serial specifications,
it will not be affected.
• 6EX: All A8xxxxxxx or systems with the A7xxxxxxx serial
number which include the “I” (Inspected) sticker
• 7C: All 08xxxxxxx or systems with the 07xxxxxxx which
include the “I” (Inspected) sticker
• TM-7: All 08xxxxxx or modules with the 07xxxxxx which
include the “I” (Inspected) sticker
If you have one or more of the preceding items without the
serial-number specifications, as I did, you need to follow the
precautionary measures. Visit the Web site for more
information and to find a hobby shop in your area that can test
your system for free. If it is affected, there will be no charge to
return and fix it, and it will receive priority service upon
arrival. MA
—Michael Ramsey
Sources:
Service advisory information
http://2.4gigahertz.com/techsupport/service-advisory-tm7-7c-
6ex.html
A section on the Futaba Web site contains answers to
popular questions about Futaba’s FASST 2.4 GHz technology,
technical updates, and programming examples. And because
the 7C FASST system is so similar to the 7C on 72 MHz, the
Futaba Web site features many frequently asked questions
that are useful in learning about this radio’s advanced
programming capabilities and limitations MA
—Michael Ramsey
Sources:
FASST Technology FAQ
http://2.4gigahertz.com/faq/faq-fasst.html
General frequently asked questions
www.futaba-rc.com
What pilot wouldn’t appreciate instant control response? The
experience is equivalent to a high-speed servo upgrade or receiverbattery
exchange from a four- to five-cell pack.
I tested the 7C 2.4 GHz system in one of my most sensitive and
aerobatic foamies. Hanging the model on the propeller and holding
it in a hover can be touchy because the skill demands almost
precognitive pilot input.
The old 7C worked great, but the new system gave me the
feeling of being physically connected to the airplane. The smallest
input I gave to the transmitter stick produced an instant command to
the aircraft. The sensation enhanced my confidence as well as my
opportunity to fly more precisely.
If you ever have the chance to compare a 72 MHz system with
the new FASST radio, check out how differently the servos work. In
the 2.4 GHz unit they seem to not only move more quickly, but also
to stop and start more precisely. If the control-stick tensions were
soft, as they typically come with a new transmitter, it would be
easier to move the stick and likewise easier to overcontrol the
model.
So there you have it. I was impressed after just holding the
transmitter in my hand.
The 7C 2.4 GHz system I tested was the “full-tilt” version that
included the heavy-duty S3152 sport digital servos. The system is
also available with helicopter-friendly features, different grades of
standard servos, or no servos.
The nice thing about the S3152 servo is that it has great holding
and centering power compared with an analog servo. It is slightly
noisy and not as smooth as a digital servo with a coreless motor, but
it is hard to beat for value. I plan to use it in a 50-size helicopter.
The included receiver is the latest seven-channel, 2.4 GHz
model: the R617FS. Those of you who are Futaba savvy will notice
that this receiver is one number different from the earlier R607FS
seven-channel FASST receiver. The gurus at Futaba tell me that the
617 is a much faster-performing receiver than the 607, and that by
the time this review is printed the pricing will be the same.
05sig2.QXD 3/25/08 9:28 AM Page 62
The receiver weighs 9 grams and offers
range capabilities for any size model.
Lightweight models or foamies can save 2
grams if the user substitutes the case for
heat-shrink wrap. The included receiver is
bound to the transmitter, and the test of
binding other Futaba FASST receivers to the
system proved to be a simple matter.
During testing I mounted the receiver
with only double-stick foam tape, but in
larger models I’d wrap the unit in foam
rubber. Metal objects, batteries, and servos
should be kept at least a few inches away
from the receiver antennas.
The two short antennas should be
mounted so that they are perpendicular to
each other and should never cross. To assure
this I secured the ends of each antenna with
tape.
The “Power Down Mode” on the
transmitter electronically reduces the output
power so a static range test can be
conducted. Three indicators on the
transmitter notify the user of when this
mode is active—one on the 72 x 32-dot
LCD screen, one on the back of the
transmitter where a signal LED will flash in
red, and an audio signal that will sound
every three seconds.
Why all the warnings? It isn’t a good
idea to fly with the transmitter in this
condition.
There’s little worry about accidentally
activating this function. Once the range
check is complete, cycle the power switch
and full range is restored. As with the old
systems, the user should be able to walk 30-
50 paces away from the model with no
glitches.
As an added measure of safety, in case
the user forgets the transmitter will
automatically return to the normal output
mode after 90 seconds in the Power Down
Mode. It takes me longer than 90 seconds to
do the test anyway.
As I mentioned, I’m comfortable with
the 7C radio and its program features and
menus. I find the edit keys in combination
with the command dial easy to operate. The
menu and/or value being adjusted can be
reached as fast as the operator can rotate the
dial.
I found the setup to be oversensitive at
first, but it didn’t take long for me to adapt
and appreciate how the dial’s precision
allowed me to program more quickly. Since
using the dial I find computer radios with
only buttons to operate the programming
functions to be antiquated.
The 7C’s features are split into a Basic
and an Advanced menu. Those who are
familiar with four- to six-channel radio
systems will find that the Basic menu offers
familiar features and all the functions
needed to get an aircraft or helicopter into
the air. To tweak the model, pushing the
Mode button brings the user into the
Advanced menu, which calls up mixing
functions and wing- and tail-type options.
Pilots such as myself who fly larger
aircraft lamented that a seven-channel radio
was inadequate for use on airplanes
equipped with dual elevator servos. These
systems wouldn’t allow a mix to link a slave
channel to the master channel’s trim lever.
The only viable option was to add a
servo accessory to the model, such as the
Futaba SR-10, that would allow independent
adjustment of the two servos outside the
normal radio programming. Only high-end
radios, such as many with eight to 14
channels, accommodated this mix, but now
the sensible 7C 2.4 can fulfill this longawaited
need.
The AILEVON feature alone is enough
reason for me to want this radio. However,
the system’s setup wasn’t at all clear in the
manual. The instructions don’t mention what
channels the elevator and aileron on this mix
feature use. Look for an online FAQ and/or
manual update in the near future.
Obviously two of the four servos go into
the assigned aileron and elevator channels.
Channel 5 is used for the second elevator
servo, and channel 6 is used for the second
aileron. With that information, following the
radio menu and the manual will get the
model trimmed and ready to fly.
Jets are coming back in a big way and in
all sizes; these pilots will appreciate the
AILEVON programming feature as well. It
allows a jet with independent servos on the
elevators and ailerons to swap or share those
transmitter stick functions. The elevators can
function as ailerons and vice versa. This is a
Tru-Turn now offers 2 Spinners made to fit the new ARF P-51’s from Hangar 9.
A 3-1/2” P-51 Spinner for the .60 P-51 ARF and a 5” P-51 Spinner for the 77”,
1.50 P-51 ARF – Available in 2, 3 & 4-blade prop slots!
The 3-1/2” is available in our “120-Slot” for your 4-stroke. The 5” is also
available in our “Menz Cut” for your euro props up to 28” diameter!
Browse our website to see these new items today! Use our Adapter
Finder™ online to find the right Adapter Kit for your engine, then:
See your Hobby Dealer or contact Tru-Turn direct!
281-479-9600 www.tru-turn.com
Made in the U.S.A.
by Romco Manufacturing, Inc.
100 West First Street, Deer Park, Texas 77536
PRECISION MODEL PRODUCTS
P-51 SPINNERS FOR YOUR
HANGAR-9 ARF Tru-Turn makes 11
sizes of P-51 Spinners
to suit your needs!
64 MODEL AVIATION
05sig2.QXD 3/25/08 9:28 AM Page 64
66 MODEL AVIATION
fun option to program on 3-D airplanes too.
The AILEVON mix, as can all the mixing,
can be set to be active all the time or be
switch selectable.
When digital trims first came out, it
didn’t take long for me to want nothing else.
What I like most is that every program of
the 10 available in this radio remembers
where I left the trim. I never have to center
the trim levers again unless I want to be that
fussy. What was awkward until now was
that the user didn’t have control over how
quickly the trim lever could move its
corresponding surface.
The TRIM function in the Basic menu is
used to control the trim sensitivity. On a
new model the user might want to set the
trims to have more movement per “beep” so
that the effect of those adjustments happens
more rapidly. Later the step count on the
trim can be decreased so the control can be
fine-tuned. Along with the 100 steps in the
SUB-TRIM function and the 40 steps in the
trim levers themselves, this radio can help
the user dial in a model perfectly.
The 7C’s TRAINER feature is, by
default, an inhibited function; the springloaded
switch used for that feature is
popular for other jobs. I use the springloaded
switch (SW-F) for the THROTTLE
CUT feature; that way if I bump it while
flying, killing the engine is less likely to
happen.
When a buddy box is connected, or any
compatible four-channel radio, the
functionality and mixing stored in the 7C
transmitter can be experienced through the
basic buddy box or likewise inhibited. I
could not think of a use for this detailed
feature until someone wanted to try my
airplane but I didn’t want to hand that
person my transmitter midflight.
A buddy box added a measure of safety,
and the 7C’s functionality could still be
experienced. The buddy-box pilot could
experience my EXPO and triple rates with
just the flip of a switch.
The six switches and single dial are
assignable for some applications. The
default program assignments are based on
popular demand, and I found most of them
to my liking. On 3-D and aerobatic models I
simplify the dual rate change operation by
locating the aileron, elevator, and rudder
rates on one switch instead of three.
Because I already locate my rates on one
switch, I can take advantage of the one
three-position switch (SW-D) and have
triple rates. The triple-rate feature is a vivid
example of how diverse the switch
assignments are and how personalized the
7C radio can be set up. Such features make
higher-end systems more attractive.
It’s important to remember that when the
user sets up dual rates, the rate is adjustable
on both sides of the control-stick center
point. Depending on the model’s CG
location, control input isn’t always
translated to the model’s reactions.
The pilot has to compensate by not
driving the stick harder one way than the
other. By adjusting the DUAL RATE on
both sides of the stick, the user can change
the control authority so that stick input
requirements are harmonized.
When adjusting the control throws on the
7C, the user can primarily manipulate the
amount of throw and resolution with the
endpoint (E. POINT) program. This
function’s default setting is 100% on both
sides of center, which can be increased to
140%.
That naturally permits full deflection
from the servo, but it also increases the
number of steps available to reach those
ends. The opportunity for precise servo
movement is therefore increased, which is a
bonus for precision Aerobatics pilots.
The DUAL RATE function can also be
used to control limit of throw on the aileron,
elevator, or rudder. If the E.POINT is set to
140% and the DUAL RATE is set to 140%
(which isn’t recommended but can be done),
the transmitter-stick bottom point will move
inward; the last few degrees of stick
movement won’t change the servo location.
I experienced this situation because I was
looking for every bit of travel from the servo
for a 3-D model.
If the E.POINT values are increased to
their full potential, don’t increase the DUAL
RATE value to more than 110%; that’s the
most travel you can get out of the servo and
still have full range in the control stick. The
instruction manual diagrams on page 33
05sig3.QXD 3/25/08 11:36 AM Page 66
May 2008 67
were helpful regarding the conditions of
these surface-movement features.
I’ve recognized this condition on every
computer radio I’ve used. It will be
refreshing when a radio is offered without
the issue.
Because I have used the 7C systems for a
while and am comfortable with them, the
transmitter battery gets lots of exercise.
The stock 600 mAh transmitter Ni-Cd has
lasted me only approximately an hour. To
be cautious, I stop flying when the battery
voltage drops to less than 9.6.
The typical battery drain on a 7C
FASST system is 180 mA. That’s low
compared to a 72 MHz system that drains
250 mA on average. I should be getting
more than three hours of operation, so
maybe I have a bad battery. Futaba advises
that it’s safe to operate the transmitter
when the voltmeter reads close to 9.0, so
perhaps I’m overcautious.
The good news is that I’ll never lose
my programming data. The internal
hardware uses an EEPROM (Electrically
Erasable Programmable Read-Only
Memory) chip that doesn’t need a power
source to retain data.
Now that NiMH batteries are so
popular, I’d like to see this radio equipped
with a 1100-1400 mAh transmitter pack.
The 10-model memory is almost full on
the systems I have, and it would be nice if
the transmitter battery lasted longer so I
could fly most of those models after a
single charge.
The included receiver pack is a
convenient 4.8-volt, 1000 mAh Ni-Cd pack.
If the pack drops to less than 3.8 volts
during a high-load maneuver, the receiver
will automatically recognize the battery
condition and go into fail-safe mode. By
default, the programming reduces the
throttle to idle but leaves the remaining
controls functioning so that the pilot may
guide the model to a safe landing point.
No matter what radio system is used, we,
as RC pilots, must consider a contingency.
The fail-safe feature in the 7C 2.4 operates
only on the throttle channel. Whether it’s an
aircraft or helicopter, the default fail-safe
setting may be inadequate.
Anytime a pilot programs a new model,
he or she should make sure the default
setting is satisfactory or custom-program the
fail-safe to suit. Do not skip this step, and be
sure to test its function by shutting down the
transmitter and observing the reaction of the
engine/motor.
Anyone who is looking to step up from a
four- or six-channel radio will find that the
Futaba 7C 2.4 GHz FASST system is not
just a tremendous value, but it will almost
instantly change (typically improve) his or
her talent as a pilot. That’s probably
because of the enhancement of the digital
spread spectrum technology and because
the advanced feature options and finetuning
capability will allow the pilot to
grow and improve.
The 7C system is user-ready right out of
the box, which means that anyone who is
familiar with a four- or six-channel radio will
feel comfortable and may want to use the
advanced features. The manual is fairly clear
about what the programming functions can do
and gives examples of why the feature would
be needed, which I found to be helpful.
Some of the most popular programming
features, such as flaperons and CCPM
(Cyclic Collective Pitch Mixing), are
already set; all the user has to do is
activate the feature and fine-tune the
values. High-end niceties such as the
switch assignments and feel of the gimbals
are a welcome bonus. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Great Planes Model Distributors
Box 9021
Champaign IL 61826
(217) 398-3630
www.futaba-rc.com
Other Review Sources:
Backyard Flyer, September 2007
Model Airplane News, January 2008 and
February 2008
R/C Report, March 2008
05sig3.QXD 3/25/08 11:36 AM Page 67
Edition: Model Aviation - 2008/05
Page Numbers: 60,61,62,64,66,67
The receiver included with the 7C 2.4
weighs only 9 grams with the case. It
should be mounted at least 2 inches
away from any metal.
Power Switch: Futaba 7C 2.4 GHz Radio System
MICHAEL RAMSEY
A popular seven-channel system is finally
available with FASST sophistication
AS THERE ARE many types of RC models, there are many types of
radio systems that can meet or exceed a given project’s needs. Most of
our aircraft in the 2- to 16-pound range require a minimum of fourchannel
control, but that just gets the model flying. What if the RC pilot
wants more options?
The mainstream radio systems vary from three- to 14-channel
control. A seven-channel radio is near the middle and, in
most cases, offers the most bang for the buck. The
seven-channel units are typically better than sixchannel
radios because they offer more mixing
capability and flexible switch options.
The perception is that nine- to 14-channel radios
are overly complex, but the six- and seven-channel
radios are friendly to use. If a buyer is looking to
purchase his or her first computer radio system, a
seven-channel unit is worth every extra dollar
compared with a six-channel system.
To suit the needs of the sport pilot and many
aggressive 3-D aircraft or helicopter pilots, the
Futaba 7C has proven to be extremely popular. I
own two of the original 72 MHz versions—one for
aircraft and the other for helicopter.
I have the latter because the smooth collective
stick on the helicopter version is such a strong
benefit for holding a steady hover. The throttle’s
firm ratchet movement on the aircraft version
helps me hold the power at a constant speed more
easily when coordinating rudder input during
complex maneuvers such as Point Rolls.
The new Futaba 7C 2.4 GHz maintains most of
the programming as the still-viable 72 MHz
versions, but because it’s dedicated to the new
Futaba Advanced Spread Spectrum Technology
(FASST), it offers a dramatically improved control
feel a pilot at any skill level can appreciate. New
program features include dual elevator servos (AILEVON),
swash-throttle mix, and governor programmability. The fail-safe
programming has also been changed; I’ll include more about that later.
The new transmitter has more precise stick gimbals. If I moved the
The 7C 2.4 transmitter antenna
can rotate 180° and fold down
to 45° and 0° angles to fit easily
inside common carrying cases.
+
• Versatile features similar to high-end systems’
• Lightweight, full-range receiver
• Upgraded control sticks with firm tension
• Program dial speeds model setup
• Available with heavy-duty digital servos
• Fantastic response to pilot’s transmitter commands
• Dual elevator servo programming
-
• Instruction manual is incomplete in some
function descriptions
• Offering higher-capacity battery packs would be
a welcome benefit
Pluses and Minuses
60 MODEL AVIATION
05sig2.QXD 3/25/08 10:00 AM Page 60
May 2008 61
Overview
System (as reviewed): Futaba 7C 7-channel 2.4GHz (FUTK7000)
Pilot skill level: Intermediate to advanced
Intended usage: 2- to 16-pound aircraft or helicopter
Includes: T7C 2.4 GHz transmitter; R617FS FASST sevenchannel,
full-range receiver; 1000 mAh, 4.8-volt Ni-Cd receiver
battery; 120-volt battery charger with 70 mA transmitter output
and 100 mA receiver output; four S3152 digital high-torque
servos; 600 mAh, 9.6-volt Ni-Cd transmitter battery; switch
harness with charge cord; black transmitter neck strap; servomounting
hardware and instruction manual
Price: $349.98
Options
The 7C 2.4 GHz system is available in the following
configurations (all include the Futaba R617FS receiver):
• Airplane version with four S3152 digital high-torque servos
• Helicopter version with four S3152 digital high-torque servos
• Airplane version with four S3004 standard ball-bearing servos
• Helicopter version with four S3001 standard ball-bearing
servos
• Airplane version with no servos
• Helicopter version with no servos MA
Overview and Options
The function dial makes programming easy and fast. The included
Advanced programming options are similar to those in high-end
radios. The 7C 2.4’s digital trims can be fine-tuned for more or less
movement authority. The stick gimbals have been upgraded also.
Photos by the author
The switches have functions programmed by default but can be
assigned, such as switch G, which can be used for the triple rate
control.
Basic
• Ten-model memory
• Six-character model naming
• Dual rate/exponential
• Endpoint adjustment
• Subtrims
• Servo reversing
• Trim
• Adjustable throttle cut
• Fail-safe (for Channel 3 only)
• Trainer system
• Throttle curve normal (five points)
• Pitch curve normal (five points)
Advanced
• Three programmable mixes
• Flaperon
• Flap trim
• Air brake
• Elevator to flap
• Flap to elevator
• V-tail mixing
• Elevon mixing
• Aileron to rudder
• Ailevon mixing
• Ailevator mixing
• Snap
Helicopter
• Throttle curve (five points, Idle up 1 & 2)
• Pitch curve (five points, Idle up 1 & 2)
• Revo mixing
• Gyro
• Hovering throttle
• Hovering pitch
• Throttle hold
• Offset
• Six swashplate setups (five CCPM options)
• Governor select
• Swash-to-throttle mixing MA
Programming Features
05sig2.QXD 3/25/08 9:21 AM Page 61
62 MODEL AVIATION
Futaba 6EX, 7C, and TM-7 Service Advisory
Find out More About FASST
The standard-size S3152 digital servo has more than 70 ounces of
torque and is great for high-performance 50-size aircraft and
helicopters.
The extra-capacity 1000 mAh, 4.8-volt battery is suitable for .40-
to .50-size glow- or electric-powered models.
stick back and forth quickly on my older 7C radio, as is done while
performing a “cracked” 3-D maneuver, the stick would soon start
squeaking because of the friction and bind. The new one doesn’t do
that. In addition, the stick tensions have been factory-adjusted to be
tight—the way I like them.
Providing tight sticks shows forethought because with a new
FASST radio the stick movement is transmitted so much more
quickly that it makes the servos move instantaneously. They act
jittery in a way, but the servos are actually doing exactly what
they’re supposed to do. It means that the latency of the radio signal
is almost zero.
Futaba calls this ability “Real-Time Response,” and it’s my
favorite advantage to using digital spread spectrum technology.
A minute number of TM-7 modules and 6EX and 7C FASST
systems were incorrectly coded with a common GUID
(Globally Unique Identifier) during the manufacturing process.
If two or more units with this common identification code are
used simultaneously, they might interfere with one another.
If your FASST system has the following serial specifications,
it will not be affected.
• 6EX: All A8xxxxxxx or systems with the A7xxxxxxx serial
number which include the “I” (Inspected) sticker
• 7C: All 08xxxxxxx or systems with the 07xxxxxxx which
include the “I” (Inspected) sticker
• TM-7: All 08xxxxxx or modules with the 07xxxxxx which
include the “I” (Inspected) sticker
If you have one or more of the preceding items without the
serial-number specifications, as I did, you need to follow the
precautionary measures. Visit the Web site for more
information and to find a hobby shop in your area that can test
your system for free. If it is affected, there will be no charge to
return and fix it, and it will receive priority service upon
arrival. MA
—Michael Ramsey
Sources:
Service advisory information
http://2.4gigahertz.com/techsupport/service-advisory-tm7-7c-
6ex.html
A section on the Futaba Web site contains answers to
popular questions about Futaba’s FASST 2.4 GHz technology,
technical updates, and programming examples. And because
the 7C FASST system is so similar to the 7C on 72 MHz, the
Futaba Web site features many frequently asked questions
that are useful in learning about this radio’s advanced
programming capabilities and limitations MA
—Michael Ramsey
Sources:
FASST Technology FAQ
http://2.4gigahertz.com/faq/faq-fasst.html
General frequently asked questions
www.futaba-rc.com
What pilot wouldn’t appreciate instant control response? The
experience is equivalent to a high-speed servo upgrade or receiverbattery
exchange from a four- to five-cell pack.
I tested the 7C 2.4 GHz system in one of my most sensitive and
aerobatic foamies. Hanging the model on the propeller and holding
it in a hover can be touchy because the skill demands almost
precognitive pilot input.
The old 7C worked great, but the new system gave me the
feeling of being physically connected to the airplane. The smallest
input I gave to the transmitter stick produced an instant command to
the aircraft. The sensation enhanced my confidence as well as my
opportunity to fly more precisely.
If you ever have the chance to compare a 72 MHz system with
the new FASST radio, check out how differently the servos work. In
the 2.4 GHz unit they seem to not only move more quickly, but also
to stop and start more precisely. If the control-stick tensions were
soft, as they typically come with a new transmitter, it would be
easier to move the stick and likewise easier to overcontrol the
model.
So there you have it. I was impressed after just holding the
transmitter in my hand.
The 7C 2.4 GHz system I tested was the “full-tilt” version that
included the heavy-duty S3152 sport digital servos. The system is
also available with helicopter-friendly features, different grades of
standard servos, or no servos.
The nice thing about the S3152 servo is that it has great holding
and centering power compared with an analog servo. It is slightly
noisy and not as smooth as a digital servo with a coreless motor, but
it is hard to beat for value. I plan to use it in a 50-size helicopter.
The included receiver is the latest seven-channel, 2.4 GHz
model: the R617FS. Those of you who are Futaba savvy will notice
that this receiver is one number different from the earlier R607FS
seven-channel FASST receiver. The gurus at Futaba tell me that the
617 is a much faster-performing receiver than the 607, and that by
the time this review is printed the pricing will be the same.
05sig2.QXD 3/25/08 9:28 AM Page 62
The receiver weighs 9 grams and offers
range capabilities for any size model.
Lightweight models or foamies can save 2
grams if the user substitutes the case for
heat-shrink wrap. The included receiver is
bound to the transmitter, and the test of
binding other Futaba FASST receivers to the
system proved to be a simple matter.
During testing I mounted the receiver
with only double-stick foam tape, but in
larger models I’d wrap the unit in foam
rubber. Metal objects, batteries, and servos
should be kept at least a few inches away
from the receiver antennas.
The two short antennas should be
mounted so that they are perpendicular to
each other and should never cross. To assure
this I secured the ends of each antenna with
tape.
The “Power Down Mode” on the
transmitter electronically reduces the output
power so a static range test can be
conducted. Three indicators on the
transmitter notify the user of when this
mode is active—one on the 72 x 32-dot
LCD screen, one on the back of the
transmitter where a signal LED will flash in
red, and an audio signal that will sound
every three seconds.
Why all the warnings? It isn’t a good
idea to fly with the transmitter in this
condition.
There’s little worry about accidentally
activating this function. Once the range
check is complete, cycle the power switch
and full range is restored. As with the old
systems, the user should be able to walk 30-
50 paces away from the model with no
glitches.
As an added measure of safety, in case
the user forgets the transmitter will
automatically return to the normal output
mode after 90 seconds in the Power Down
Mode. It takes me longer than 90 seconds to
do the test anyway.
As I mentioned, I’m comfortable with
the 7C radio and its program features and
menus. I find the edit keys in combination
with the command dial easy to operate. The
menu and/or value being adjusted can be
reached as fast as the operator can rotate the
dial.
I found the setup to be oversensitive at
first, but it didn’t take long for me to adapt
and appreciate how the dial’s precision
allowed me to program more quickly. Since
using the dial I find computer radios with
only buttons to operate the programming
functions to be antiquated.
The 7C’s features are split into a Basic
and an Advanced menu. Those who are
familiar with four- to six-channel radio
systems will find that the Basic menu offers
familiar features and all the functions
needed to get an aircraft or helicopter into
the air. To tweak the model, pushing the
Mode button brings the user into the
Advanced menu, which calls up mixing
functions and wing- and tail-type options.
Pilots such as myself who fly larger
aircraft lamented that a seven-channel radio
was inadequate for use on airplanes
equipped with dual elevator servos. These
systems wouldn’t allow a mix to link a slave
channel to the master channel’s trim lever.
The only viable option was to add a
servo accessory to the model, such as the
Futaba SR-10, that would allow independent
adjustment of the two servos outside the
normal radio programming. Only high-end
radios, such as many with eight to 14
channels, accommodated this mix, but now
the sensible 7C 2.4 can fulfill this longawaited
need.
The AILEVON feature alone is enough
reason for me to want this radio. However,
the system’s setup wasn’t at all clear in the
manual. The instructions don’t mention what
channels the elevator and aileron on this mix
feature use. Look for an online FAQ and/or
manual update in the near future.
Obviously two of the four servos go into
the assigned aileron and elevator channels.
Channel 5 is used for the second elevator
servo, and channel 6 is used for the second
aileron. With that information, following the
radio menu and the manual will get the
model trimmed and ready to fly.
Jets are coming back in a big way and in
all sizes; these pilots will appreciate the
AILEVON programming feature as well. It
allows a jet with independent servos on the
elevators and ailerons to swap or share those
transmitter stick functions. The elevators can
function as ailerons and vice versa. This is a
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64 MODEL AVIATION
05sig2.QXD 3/25/08 9:28 AM Page 64
66 MODEL AVIATION
fun option to program on 3-D airplanes too.
The AILEVON mix, as can all the mixing,
can be set to be active all the time or be
switch selectable.
When digital trims first came out, it
didn’t take long for me to want nothing else.
What I like most is that every program of
the 10 available in this radio remembers
where I left the trim. I never have to center
the trim levers again unless I want to be that
fussy. What was awkward until now was
that the user didn’t have control over how
quickly the trim lever could move its
corresponding surface.
The TRIM function in the Basic menu is
used to control the trim sensitivity. On a
new model the user might want to set the
trims to have more movement per “beep” so
that the effect of those adjustments happens
more rapidly. Later the step count on the
trim can be decreased so the control can be
fine-tuned. Along with the 100 steps in the
SUB-TRIM function and the 40 steps in the
trim levers themselves, this radio can help
the user dial in a model perfectly.
The 7C’s TRAINER feature is, by
default, an inhibited function; the springloaded
switch used for that feature is
popular for other jobs. I use the springloaded
switch (SW-F) for the THROTTLE
CUT feature; that way if I bump it while
flying, killing the engine is less likely to
happen.
When a buddy box is connected, or any
compatible four-channel radio, the
functionality and mixing stored in the 7C
transmitter can be experienced through the
basic buddy box or likewise inhibited. I
could not think of a use for this detailed
feature until someone wanted to try my
airplane but I didn’t want to hand that
person my transmitter midflight.
A buddy box added a measure of safety,
and the 7C’s functionality could still be
experienced. The buddy-box pilot could
experience my EXPO and triple rates with
just the flip of a switch.
The six switches and single dial are
assignable for some applications. The
default program assignments are based on
popular demand, and I found most of them
to my liking. On 3-D and aerobatic models I
simplify the dual rate change operation by
locating the aileron, elevator, and rudder
rates on one switch instead of three.
Because I already locate my rates on one
switch, I can take advantage of the one
three-position switch (SW-D) and have
triple rates. The triple-rate feature is a vivid
example of how diverse the switch
assignments are and how personalized the
7C radio can be set up. Such features make
higher-end systems more attractive.
It’s important to remember that when the
user sets up dual rates, the rate is adjustable
on both sides of the control-stick center
point. Depending on the model’s CG
location, control input isn’t always
translated to the model’s reactions.
The pilot has to compensate by not
driving the stick harder one way than the
other. By adjusting the DUAL RATE on
both sides of the stick, the user can change
the control authority so that stick input
requirements are harmonized.
When adjusting the control throws on the
7C, the user can primarily manipulate the
amount of throw and resolution with the
endpoint (E. POINT) program. This
function’s default setting is 100% on both
sides of center, which can be increased to
140%.
That naturally permits full deflection
from the servo, but it also increases the
number of steps available to reach those
ends. The opportunity for precise servo
movement is therefore increased, which is a
bonus for precision Aerobatics pilots.
The DUAL RATE function can also be
used to control limit of throw on the aileron,
elevator, or rudder. If the E.POINT is set to
140% and the DUAL RATE is set to 140%
(which isn’t recommended but can be done),
the transmitter-stick bottom point will move
inward; the last few degrees of stick
movement won’t change the servo location.
I experienced this situation because I was
looking for every bit of travel from the servo
for a 3-D model.
If the E.POINT values are increased to
their full potential, don’t increase the DUAL
RATE value to more than 110%; that’s the
most travel you can get out of the servo and
still have full range in the control stick. The
instruction manual diagrams on page 33
05sig3.QXD 3/25/08 11:36 AM Page 66
May 2008 67
were helpful regarding the conditions of
these surface-movement features.
I’ve recognized this condition on every
computer radio I’ve used. It will be
refreshing when a radio is offered without
the issue.
Because I have used the 7C systems for a
while and am comfortable with them, the
transmitter battery gets lots of exercise.
The stock 600 mAh transmitter Ni-Cd has
lasted me only approximately an hour. To
be cautious, I stop flying when the battery
voltage drops to less than 9.6.
The typical battery drain on a 7C
FASST system is 180 mA. That’s low
compared to a 72 MHz system that drains
250 mA on average. I should be getting
more than three hours of operation, so
maybe I have a bad battery. Futaba advises
that it’s safe to operate the transmitter
when the voltmeter reads close to 9.0, so
perhaps I’m overcautious.
The good news is that I’ll never lose
my programming data. The internal
hardware uses an EEPROM (Electrically
Erasable Programmable Read-Only
Memory) chip that doesn’t need a power
source to retain data.
Now that NiMH batteries are so
popular, I’d like to see this radio equipped
with a 1100-1400 mAh transmitter pack.
The 10-model memory is almost full on
the systems I have, and it would be nice if
the transmitter battery lasted longer so I
could fly most of those models after a
single charge.
The included receiver pack is a
convenient 4.8-volt, 1000 mAh Ni-Cd pack.
If the pack drops to less than 3.8 volts
during a high-load maneuver, the receiver
will automatically recognize the battery
condition and go into fail-safe mode. By
default, the programming reduces the
throttle to idle but leaves the remaining
controls functioning so that the pilot may
guide the model to a safe landing point.
No matter what radio system is used, we,
as RC pilots, must consider a contingency.
The fail-safe feature in the 7C 2.4 operates
only on the throttle channel. Whether it’s an
aircraft or helicopter, the default fail-safe
setting may be inadequate.
Anytime a pilot programs a new model,
he or she should make sure the default
setting is satisfactory or custom-program the
fail-safe to suit. Do not skip this step, and be
sure to test its function by shutting down the
transmitter and observing the reaction of the
engine/motor.
Anyone who is looking to step up from a
four- or six-channel radio will find that the
Futaba 7C 2.4 GHz FASST system is not
just a tremendous value, but it will almost
instantly change (typically improve) his or
her talent as a pilot. That’s probably
because of the enhancement of the digital
spread spectrum technology and because
the advanced feature options and finetuning
capability will allow the pilot to
grow and improve.
The 7C system is user-ready right out of
the box, which means that anyone who is
familiar with a four- or six-channel radio will
feel comfortable and may want to use the
advanced features. The manual is fairly clear
about what the programming functions can do
and gives examples of why the feature would
be needed, which I found to be helpful.
Some of the most popular programming
features, such as flaperons and CCPM
(Cyclic Collective Pitch Mixing), are
already set; all the user has to do is
activate the feature and fine-tune the
values. High-end niceties such as the
switch assignments and feel of the gimbals
are a welcome bonus. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Great Planes Model Distributors
Box 9021
Champaign IL 61826
(217) 398-3630
www.futaba-rc.com
Other Review Sources:
Backyard Flyer, September 2007
Model Airplane News, January 2008 and
February 2008
R/C Report, March 2008
05sig3.QXD 3/25/08 11:36 AM Page 67
Edition: Model Aviation - 2008/05
Page Numbers: 60,61,62,64,66,67
The receiver included with the 7C 2.4
weighs only 9 grams with the case. It
should be mounted at least 2 inches
away from any metal.
Power Switch: Futaba 7C 2.4 GHz Radio System
MICHAEL RAMSEY
A popular seven-channel system is finally
available with FASST sophistication
AS THERE ARE many types of RC models, there are many types of
radio systems that can meet or exceed a given project’s needs. Most of
our aircraft in the 2- to 16-pound range require a minimum of fourchannel
control, but that just gets the model flying. What if the RC pilot
wants more options?
The mainstream radio systems vary from three- to 14-channel
control. A seven-channel radio is near the middle and, in
most cases, offers the most bang for the buck. The
seven-channel units are typically better than sixchannel
radios because they offer more mixing
capability and flexible switch options.
The perception is that nine- to 14-channel radios
are overly complex, but the six- and seven-channel
radios are friendly to use. If a buyer is looking to
purchase his or her first computer radio system, a
seven-channel unit is worth every extra dollar
compared with a six-channel system.
To suit the needs of the sport pilot and many
aggressive 3-D aircraft or helicopter pilots, the
Futaba 7C has proven to be extremely popular. I
own two of the original 72 MHz versions—one for
aircraft and the other for helicopter.
I have the latter because the smooth collective
stick on the helicopter version is such a strong
benefit for holding a steady hover. The throttle’s
firm ratchet movement on the aircraft version
helps me hold the power at a constant speed more
easily when coordinating rudder input during
complex maneuvers such as Point Rolls.
The new Futaba 7C 2.4 GHz maintains most of
the programming as the still-viable 72 MHz
versions, but because it’s dedicated to the new
Futaba Advanced Spread Spectrum Technology
(FASST), it offers a dramatically improved control
feel a pilot at any skill level can appreciate. New
program features include dual elevator servos (AILEVON),
swash-throttle mix, and governor programmability. The fail-safe
programming has also been changed; I’ll include more about that later.
The new transmitter has more precise stick gimbals. If I moved the
The 7C 2.4 transmitter antenna
can rotate 180° and fold down
to 45° and 0° angles to fit easily
inside common carrying cases.
+
• Versatile features similar to high-end systems’
• Lightweight, full-range receiver
• Upgraded control sticks with firm tension
• Program dial speeds model setup
• Available with heavy-duty digital servos
• Fantastic response to pilot’s transmitter commands
• Dual elevator servo programming
-
• Instruction manual is incomplete in some
function descriptions
• Offering higher-capacity battery packs would be
a welcome benefit
Pluses and Minuses
60 MODEL AVIATION
05sig2.QXD 3/25/08 10:00 AM Page 60
May 2008 61
Overview
System (as reviewed): Futaba 7C 7-channel 2.4GHz (FUTK7000)
Pilot skill level: Intermediate to advanced
Intended usage: 2- to 16-pound aircraft or helicopter
Includes: T7C 2.4 GHz transmitter; R617FS FASST sevenchannel,
full-range receiver; 1000 mAh, 4.8-volt Ni-Cd receiver
battery; 120-volt battery charger with 70 mA transmitter output
and 100 mA receiver output; four S3152 digital high-torque
servos; 600 mAh, 9.6-volt Ni-Cd transmitter battery; switch
harness with charge cord; black transmitter neck strap; servomounting
hardware and instruction manual
Price: $349.98
Options
The 7C 2.4 GHz system is available in the following
configurations (all include the Futaba R617FS receiver):
• Airplane version with four S3152 digital high-torque servos
• Helicopter version with four S3152 digital high-torque servos
• Airplane version with four S3004 standard ball-bearing servos
• Helicopter version with four S3001 standard ball-bearing
servos
• Airplane version with no servos
• Helicopter version with no servos MA
Overview and Options
The function dial makes programming easy and fast. The included
Advanced programming options are similar to those in high-end
radios. The 7C 2.4’s digital trims can be fine-tuned for more or less
movement authority. The stick gimbals have been upgraded also.
Photos by the author
The switches have functions programmed by default but can be
assigned, such as switch G, which can be used for the triple rate
control.
Basic
• Ten-model memory
• Six-character model naming
• Dual rate/exponential
• Endpoint adjustment
• Subtrims
• Servo reversing
• Trim
• Adjustable throttle cut
• Fail-safe (for Channel 3 only)
• Trainer system
• Throttle curve normal (five points)
• Pitch curve normal (five points)
Advanced
• Three programmable mixes
• Flaperon
• Flap trim
• Air brake
• Elevator to flap
• Flap to elevator
• V-tail mixing
• Elevon mixing
• Aileron to rudder
• Ailevon mixing
• Ailevator mixing
• Snap
Helicopter
• Throttle curve (five points, Idle up 1 & 2)
• Pitch curve (five points, Idle up 1 & 2)
• Revo mixing
• Gyro
• Hovering throttle
• Hovering pitch
• Throttle hold
• Offset
• Six swashplate setups (five CCPM options)
• Governor select
• Swash-to-throttle mixing MA
Programming Features
05sig2.QXD 3/25/08 9:21 AM Page 61
62 MODEL AVIATION
Futaba 6EX, 7C, and TM-7 Service Advisory
Find out More About FASST
The standard-size S3152 digital servo has more than 70 ounces of
torque and is great for high-performance 50-size aircraft and
helicopters.
The extra-capacity 1000 mAh, 4.8-volt battery is suitable for .40-
to .50-size glow- or electric-powered models.
stick back and forth quickly on my older 7C radio, as is done while
performing a “cracked” 3-D maneuver, the stick would soon start
squeaking because of the friction and bind. The new one doesn’t do
that. In addition, the stick tensions have been factory-adjusted to be
tight—the way I like them.
Providing tight sticks shows forethought because with a new
FASST radio the stick movement is transmitted so much more
quickly that it makes the servos move instantaneously. They act
jittery in a way, but the servos are actually doing exactly what
they’re supposed to do. It means that the latency of the radio signal
is almost zero.
Futaba calls this ability “Real-Time Response,” and it’s my
favorite advantage to using digital spread spectrum technology.
A minute number of TM-7 modules and 6EX and 7C FASST
systems were incorrectly coded with a common GUID
(Globally Unique Identifier) during the manufacturing process.
If two or more units with this common identification code are
used simultaneously, they might interfere with one another.
If your FASST system has the following serial specifications,
it will not be affected.
• 6EX: All A8xxxxxxx or systems with the A7xxxxxxx serial
number which include the “I” (Inspected) sticker
• 7C: All 08xxxxxxx or systems with the 07xxxxxxx which
include the “I” (Inspected) sticker
• TM-7: All 08xxxxxx or modules with the 07xxxxxx which
include the “I” (Inspected) sticker
If you have one or more of the preceding items without the
serial-number specifications, as I did, you need to follow the
precautionary measures. Visit the Web site for more
information and to find a hobby shop in your area that can test
your system for free. If it is affected, there will be no charge to
return and fix it, and it will receive priority service upon
arrival. MA
—Michael Ramsey
Sources:
Service advisory information
http://2.4gigahertz.com/techsupport/service-advisory-tm7-7c-
6ex.html
A section on the Futaba Web site contains answers to
popular questions about Futaba’s FASST 2.4 GHz technology,
technical updates, and programming examples. And because
the 7C FASST system is so similar to the 7C on 72 MHz, the
Futaba Web site features many frequently asked questions
that are useful in learning about this radio’s advanced
programming capabilities and limitations MA
—Michael Ramsey
Sources:
FASST Technology FAQ
http://2.4gigahertz.com/faq/faq-fasst.html
General frequently asked questions
www.futaba-rc.com
What pilot wouldn’t appreciate instant control response? The
experience is equivalent to a high-speed servo upgrade or receiverbattery
exchange from a four- to five-cell pack.
I tested the 7C 2.4 GHz system in one of my most sensitive and
aerobatic foamies. Hanging the model on the propeller and holding
it in a hover can be touchy because the skill demands almost
precognitive pilot input.
The old 7C worked great, but the new system gave me the
feeling of being physically connected to the airplane. The smallest
input I gave to the transmitter stick produced an instant command to
the aircraft. The sensation enhanced my confidence as well as my
opportunity to fly more precisely.
If you ever have the chance to compare a 72 MHz system with
the new FASST radio, check out how differently the servos work. In
the 2.4 GHz unit they seem to not only move more quickly, but also
to stop and start more precisely. If the control-stick tensions were
soft, as they typically come with a new transmitter, it would be
easier to move the stick and likewise easier to overcontrol the
model.
So there you have it. I was impressed after just holding the
transmitter in my hand.
The 7C 2.4 GHz system I tested was the “full-tilt” version that
included the heavy-duty S3152 sport digital servos. The system is
also available with helicopter-friendly features, different grades of
standard servos, or no servos.
The nice thing about the S3152 servo is that it has great holding
and centering power compared with an analog servo. It is slightly
noisy and not as smooth as a digital servo with a coreless motor, but
it is hard to beat for value. I plan to use it in a 50-size helicopter.
The included receiver is the latest seven-channel, 2.4 GHz
model: the R617FS. Those of you who are Futaba savvy will notice
that this receiver is one number different from the earlier R607FS
seven-channel FASST receiver. The gurus at Futaba tell me that the
617 is a much faster-performing receiver than the 607, and that by
the time this review is printed the pricing will be the same.
05sig2.QXD 3/25/08 9:28 AM Page 62
The receiver weighs 9 grams and offers
range capabilities for any size model.
Lightweight models or foamies can save 2
grams if the user substitutes the case for
heat-shrink wrap. The included receiver is
bound to the transmitter, and the test of
binding other Futaba FASST receivers to the
system proved to be a simple matter.
During testing I mounted the receiver
with only double-stick foam tape, but in
larger models I’d wrap the unit in foam
rubber. Metal objects, batteries, and servos
should be kept at least a few inches away
from the receiver antennas.
The two short antennas should be
mounted so that they are perpendicular to
each other and should never cross. To assure
this I secured the ends of each antenna with
tape.
The “Power Down Mode” on the
transmitter electronically reduces the output
power so a static range test can be
conducted. Three indicators on the
transmitter notify the user of when this
mode is active—one on the 72 x 32-dot
LCD screen, one on the back of the
transmitter where a signal LED will flash in
red, and an audio signal that will sound
every three seconds.
Why all the warnings? It isn’t a good
idea to fly with the transmitter in this
condition.
There’s little worry about accidentally
activating this function. Once the range
check is complete, cycle the power switch
and full range is restored. As with the old
systems, the user should be able to walk 30-
50 paces away from the model with no
glitches.
As an added measure of safety, in case
the user forgets the transmitter will
automatically return to the normal output
mode after 90 seconds in the Power Down
Mode. It takes me longer than 90 seconds to
do the test anyway.
As I mentioned, I’m comfortable with
the 7C radio and its program features and
menus. I find the edit keys in combination
with the command dial easy to operate. The
menu and/or value being adjusted can be
reached as fast as the operator can rotate the
dial.
I found the setup to be oversensitive at
first, but it didn’t take long for me to adapt
and appreciate how the dial’s precision
allowed me to program more quickly. Since
using the dial I find computer radios with
only buttons to operate the programming
functions to be antiquated.
The 7C’s features are split into a Basic
and an Advanced menu. Those who are
familiar with four- to six-channel radio
systems will find that the Basic menu offers
familiar features and all the functions
needed to get an aircraft or helicopter into
the air. To tweak the model, pushing the
Mode button brings the user into the
Advanced menu, which calls up mixing
functions and wing- and tail-type options.
Pilots such as myself who fly larger
aircraft lamented that a seven-channel radio
was inadequate for use on airplanes
equipped with dual elevator servos. These
systems wouldn’t allow a mix to link a slave
channel to the master channel’s trim lever.
The only viable option was to add a
servo accessory to the model, such as the
Futaba SR-10, that would allow independent
adjustment of the two servos outside the
normal radio programming. Only high-end
radios, such as many with eight to 14
channels, accommodated this mix, but now
the sensible 7C 2.4 can fulfill this longawaited
need.
The AILEVON feature alone is enough
reason for me to want this radio. However,
the system’s setup wasn’t at all clear in the
manual. The instructions don’t mention what
channels the elevator and aileron on this mix
feature use. Look for an online FAQ and/or
manual update in the near future.
Obviously two of the four servos go into
the assigned aileron and elevator channels.
Channel 5 is used for the second elevator
servo, and channel 6 is used for the second
aileron. With that information, following the
radio menu and the manual will get the
model trimmed and ready to fly.
Jets are coming back in a big way and in
all sizes; these pilots will appreciate the
AILEVON programming feature as well. It
allows a jet with independent servos on the
elevators and ailerons to swap or share those
transmitter stick functions. The elevators can
function as ailerons and vice versa. This is a
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64 MODEL AVIATION
05sig2.QXD 3/25/08 9:28 AM Page 64
66 MODEL AVIATION
fun option to program on 3-D airplanes too.
The AILEVON mix, as can all the mixing,
can be set to be active all the time or be
switch selectable.
When digital trims first came out, it
didn’t take long for me to want nothing else.
What I like most is that every program of
the 10 available in this radio remembers
where I left the trim. I never have to center
the trim levers again unless I want to be that
fussy. What was awkward until now was
that the user didn’t have control over how
quickly the trim lever could move its
corresponding surface.
The TRIM function in the Basic menu is
used to control the trim sensitivity. On a
new model the user might want to set the
trims to have more movement per “beep” so
that the effect of those adjustments happens
more rapidly. Later the step count on the
trim can be decreased so the control can be
fine-tuned. Along with the 100 steps in the
SUB-TRIM function and the 40 steps in the
trim levers themselves, this radio can help
the user dial in a model perfectly.
The 7C’s TRAINER feature is, by
default, an inhibited function; the springloaded
switch used for that feature is
popular for other jobs. I use the springloaded
switch (SW-F) for the THROTTLE
CUT feature; that way if I bump it while
flying, killing the engine is less likely to
happen.
When a buddy box is connected, or any
compatible four-channel radio, the
functionality and mixing stored in the 7C
transmitter can be experienced through the
basic buddy box or likewise inhibited. I
could not think of a use for this detailed
feature until someone wanted to try my
airplane but I didn’t want to hand that
person my transmitter midflight.
A buddy box added a measure of safety,
and the 7C’s functionality could still be
experienced. The buddy-box pilot could
experience my EXPO and triple rates with
just the flip of a switch.
The six switches and single dial are
assignable for some applications. The
default program assignments are based on
popular demand, and I found most of them
to my liking. On 3-D and aerobatic models I
simplify the dual rate change operation by
locating the aileron, elevator, and rudder
rates on one switch instead of three.
Because I already locate my rates on one
switch, I can take advantage of the one
three-position switch (SW-D) and have
triple rates. The triple-rate feature is a vivid
example of how diverse the switch
assignments are and how personalized the
7C radio can be set up. Such features make
higher-end systems more attractive.
It’s important to remember that when the
user sets up dual rates, the rate is adjustable
on both sides of the control-stick center
point. Depending on the model’s CG
location, control input isn’t always
translated to the model’s reactions.
The pilot has to compensate by not
driving the stick harder one way than the
other. By adjusting the DUAL RATE on
both sides of the stick, the user can change
the control authority so that stick input
requirements are harmonized.
When adjusting the control throws on the
7C, the user can primarily manipulate the
amount of throw and resolution with the
endpoint (E. POINT) program. This
function’s default setting is 100% on both
sides of center, which can be increased to
140%.
That naturally permits full deflection
from the servo, but it also increases the
number of steps available to reach those
ends. The opportunity for precise servo
movement is therefore increased, which is a
bonus for precision Aerobatics pilots.
The DUAL RATE function can also be
used to control limit of throw on the aileron,
elevator, or rudder. If the E.POINT is set to
140% and the DUAL RATE is set to 140%
(which isn’t recommended but can be done),
the transmitter-stick bottom point will move
inward; the last few degrees of stick
movement won’t change the servo location.
I experienced this situation because I was
looking for every bit of travel from the servo
for a 3-D model.
If the E.POINT values are increased to
their full potential, don’t increase the DUAL
RATE value to more than 110%; that’s the
most travel you can get out of the servo and
still have full range in the control stick. The
instruction manual diagrams on page 33
05sig3.QXD 3/25/08 11:36 AM Page 66
May 2008 67
were helpful regarding the conditions of
these surface-movement features.
I’ve recognized this condition on every
computer radio I’ve used. It will be
refreshing when a radio is offered without
the issue.
Because I have used the 7C systems for a
while and am comfortable with them, the
transmitter battery gets lots of exercise.
The stock 600 mAh transmitter Ni-Cd has
lasted me only approximately an hour. To
be cautious, I stop flying when the battery
voltage drops to less than 9.6.
The typical battery drain on a 7C
FASST system is 180 mA. That’s low
compared to a 72 MHz system that drains
250 mA on average. I should be getting
more than three hours of operation, so
maybe I have a bad battery. Futaba advises
that it’s safe to operate the transmitter
when the voltmeter reads close to 9.0, so
perhaps I’m overcautious.
The good news is that I’ll never lose
my programming data. The internal
hardware uses an EEPROM (Electrically
Erasable Programmable Read-Only
Memory) chip that doesn’t need a power
source to retain data.
Now that NiMH batteries are so
popular, I’d like to see this radio equipped
with a 1100-1400 mAh transmitter pack.
The 10-model memory is almost full on
the systems I have, and it would be nice if
the transmitter battery lasted longer so I
could fly most of those models after a
single charge.
The included receiver pack is a
convenient 4.8-volt, 1000 mAh Ni-Cd pack.
If the pack drops to less than 3.8 volts
during a high-load maneuver, the receiver
will automatically recognize the battery
condition and go into fail-safe mode. By
default, the programming reduces the
throttle to idle but leaves the remaining
controls functioning so that the pilot may
guide the model to a safe landing point.
No matter what radio system is used, we,
as RC pilots, must consider a contingency.
The fail-safe feature in the 7C 2.4 operates
only on the throttle channel. Whether it’s an
aircraft or helicopter, the default fail-safe
setting may be inadequate.
Anytime a pilot programs a new model,
he or she should make sure the default
setting is satisfactory or custom-program the
fail-safe to suit. Do not skip this step, and be
sure to test its function by shutting down the
transmitter and observing the reaction of the
engine/motor.
Anyone who is looking to step up from a
four- or six-channel radio will find that the
Futaba 7C 2.4 GHz FASST system is not
just a tremendous value, but it will almost
instantly change (typically improve) his or
her talent as a pilot. That’s probably
because of the enhancement of the digital
spread spectrum technology and because
the advanced feature options and finetuning
capability will allow the pilot to
grow and improve.
The 7C system is user-ready right out of
the box, which means that anyone who is
familiar with a four- or six-channel radio will
feel comfortable and may want to use the
advanced features. The manual is fairly clear
about what the programming functions can do
and gives examples of why the feature would
be needed, which I found to be helpful.
Some of the most popular programming
features, such as flaperons and CCPM
(Cyclic Collective Pitch Mixing), are
already set; all the user has to do is
activate the feature and fine-tune the
values. High-end niceties such as the
switch assignments and feel of the gimbals
are a welcome bonus. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Great Planes Model Distributors
Box 9021
Champaign IL 61826
(217) 398-3630
www.futaba-rc.com
Other Review Sources:
Backyard Flyer, September 2007
Model Airplane News, January 2008 and
February 2008
R/C Report, March 2008
05sig3.QXD 3/25/08 11:36 AM Page 67