Above: The Atlas motor is highlighted by
its finely machined parts and fitted strain
relief on the output wires.
Left: Three nicely packaged Atlas motors;
each version is marked on the end of the
box. These solid outrunners for airplanes
weigh roughly 18 ounces.
IT SEEMS AS though we’re presented with
a new line of brushless motors every week.
Although some are remarkable, others are
forgettable, and my experience with the
three Atlas motors that Hobby Lobby sent
for testing shows them to be undeniably in
the first category.
I tested the AM2312/09, AM2312/07,
and AM2308/14 Atlas motors. Each version
lists for approximately $59, but a recent
check of the Web site showed them to be on
sale for $39.
With quality do-it-yourself kits selling
for roughly the same price, it’s hard to
imagine why I’d build one instead of buying
one of these Atlases. Add the fact that they
come with all the accessories you’re likely
to need, and these motors are a real deal!
Construction: Each motor is an outrunner,
so you’ll be spinning a large propeller
without a gearbox. I found each motor to run
extremely smoothly, with no need for
advanced programming. That means you’ll
save even more money when you shop for
your controller.
The motor’s main shaft is supported by
two ball bearings, as you can see in the photo
where I took it apart. The motor comes apart
easily by removing the circlip from the shaft.
A word of caution: there is no reason
whatsoever to take a motor apart unless
you’ve worn it out and plan to rebuild it. At
these prices I wouldn’t even bother. I took one
apart so you could see the inside, and I hope it
satisfies your curiosity.
The magnets are neodymium and each
shaft is hardened 3.17mm, or approximately
1/8 inch, steel. The numbers in the name
designate the size of the stator and the
rounded-off Kv.
On the Bench: The charts show all the
factory predictions for each motor I tested. I
always take these numbers with a grain of salt
because each motor can vary and
manufacturers often get better numbers than
we do on the bench.
I was pleasantly surprised to find that
my test numbers were very much in line
with the findings on the charts. They aren’t
exact, but it’s about as close as I’ve ever
come to my results matching the marketing
numbers.
You can see on the chart for the
AM2312/07 that predictions are to spin a
10 x 7 propeller on 9.7 volts at 8.9 amps
and see an rpm of 4,685. On the bench I
found that at 9.7 volts the motor drew 9.4
amps but spun the propeller at 4,900 rpm. It
got even better in flight when I hooked up
the Eagle Tree MicroPower data logger.
The same setup in flight showed a drop
to 8.1 amps, and the rpm increased to 5,200
at the same voltage. Bench-testing doesn’t
reveal the amount of unloading a motor
goes through in flight, and even that can
vary depending on the airplane. However,
these numbers are excellent and accurate
for planning, and that’s a nice thing to find.
Each motor comes with all the
accessories you’ll need to mount it behind or
in front of the firewall. This is a welcome
find too because so many of the inexpensive
motors end up costing so much more when
you have to buy after-market
mounts, etc.
The propeller adapter is
a nicely machined
aluminum type. All the
proper screws for
assembly and
mounting are
included along with
the appropriate
Allen wrenches.
The Truth Is in the
Flying: The 2308
series is designed for
airplanes weighing as
much as 16 ounces, and
the 2312 series is for
airplanes weighing as much as
18 ounces. Looking around the
shop, I quickly found a couple models I
could easily mount the Atlases to, and one
of them allowed the use of the MicroPower
logger.
I mounted the AM2308/14 in my
Thunder Tiger Velocity flying wing. This is
a fast little model on a standard ferrite
motor, and it’s downright scary with the
Atlas motor installed.
I went from a 5 x 5 propeller on the
original setup to a 7 x 5. Both setups ran on
a 3S Li-Poly pack, but after the modification
I was spinning a larger propeller
at just more than 10,000 rpm.
The sound alone got my attention,
and it was all propeller noise. Performance
took a climb that has to be seen to be
appreciated, but I was suddenly “on my
toes” trying to keep up.
I mounted the AM2312/07 on my
Horizon Hobby Tribute foamie. I had a
somewhat smaller outrunner on it before
spinning the same 10 x 7 slow flyer
propeller on a 3S Li-Poly pack, so I was
anxious to compare performance. I did pick
up a little weight because I installed the data
logger for some in-flight testing, as I
mentioned.
The performance was excellent and any
3-D maneuver was easy—assuming you can
do them. I’m a lousy 3-D novice, but the
guys at the field who were more than willing
to “test” my setup found it to be a lot of fun.
I didn’t have a dynamometer to give these
motors a true lab test, but I’m an average
everyday flier so that’s the way I
approached the tests. I found the Atlases to
be nicely machined, and the work inside
looked neat and tidy.
The motor in the Tribute has not
exceeded 130° even in our recent 95°
temperatures, but it does hang out in the
open for cooling. The power plant in the
66 MODEL AVIATION
Above: The motor is disassembled for inspection, showing all included
hardware. The 12-pole motor design promotes greater power output.
Left: The included propeller hub is a nice bonus. An AM2312/07 is tested
with a 10 x 7 propeller, shown with firewall mount installed.
The three versions tested required a
12- to 15-amp speed control. The
AM2312/09’s higher wind provides
more torque for the use of larger
propellers.
The Thunder Tiger
Velocity EP is a
Speed 400-size flying
wing. The fastturning
AM2308/14
is a great upgrade.
The performance is
incredible.
+•
Smooth operation.
• All hardware included.
• Excellent propeller adapter.
• Sturdy firewall mount. -•
None noted.
Pluses and Minuses
Velocity is completely enclosed, and a
check with the temperature gun upon
landing shows that it’s running a bit hotter
but not enough to burn your finger.
I like the fact that I didn’t have to go out
and search for mounting hardware or Allen
wrenches to fit the bolts. I think Hobby
Lobby has found a good, inexpensive motor
for the modelers. MA
Greg Gimlick
[email protected]
Distributor:
5614 Franklin Pike Cir.
Brentwood TN 37027
(615) 373-1444
Fax: (615) 377-6948
www.hobby-lobby.com/atlasoutrunners.
htm
April 2007 67
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
9 x 6 Voltage 7.2 8.3 9.4 10.6 11.7 6.8 9.6
Current (amps) 7.2 9.0 10.9 12.8 14.5 6.5 10.7
rpm 5,043 5,603 6,099 5,626 6,891 4,811 6,075
10 x 4.7 Voltage 7.1 8.3 9.4 10.5 11.7 6.8 9.5
Current (amps) 7.5 9.3 11.1 13.0 14.7 6.8 11.0
rpm 4,925 5,468 5,967 6,424 6,807 4,678 5,949
10 x 7 Voltage 7 8.1 9.2 — — 6.6 9.3
Current (amps) 9.4 11.5 13.5 — — 8.5 13.5
rpm 4,364 4,804 5,186 — — 4,173 5,183
ATLAS
AM2312/09
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
10 x 7 Voltage 7.2 8.4 9.6 10.8 12.0 6.9 9.7
Current (amps) 6.2 7.6 9.1 10.5 11.9 5.6 8.9
rpm 3,904 4,349 4,714 5,049 5,329 3,711 4,685
11 x 4.7 Voltage 7.3 8.4 9.6 10.8 12.0 6.9 9.8
Current (amps) 5.8 7.2 8.6 10.2 11.4 5.3 8.5
rpm 4,008 4,465 4,861 5,251 5,564 3,835 5,073
11 x 7 Voltage 7.2 8.3 9.5 10.7 11.9 6.9 9.7
Current (amps) 7.1 8.6 10.2 11.5 12.8 6.3 9.8
rpm 3,586 3,964 4,310 4,539 4,761 3,379 4,239
ATLAS
AM2312/07
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
7 x 4 Voltage 7.2 8.3 9.5 10.6 11.7 6.9 9.6
Current (amps) 6.2 7.8 9.5 11.3 13.1 5.7 9.6
rpm 8,372 9,375 10,286 11,125 11,862 8,037 10,329
7 x 5 Voltage 7.2 8.3 9.4 10.6 11.7 6.8 9.6
Current (amps) 6.8 8.4 10.1 11.9 13.7 6.3 10.2
rpm 8,148 9,141 10,076 10,949 11,712 7,821 10,126
8 x 3.8 Voltage 7 8.1 9.2 10.4 — 6.7 9.4
Current (amps) 8.4 10.4 12.5 14.5 — 7.6 12.5
rpm 7,493 8,292 9,016 9,650 — 7,187 9,017
ATLAS
AM2308/14
An eight- to 12-amp brushless ESC is recommended
An eight- to 12-amp brushless ESC is recommended
An eight- to 12-amp brushless ESC is recommended
Product Name AM2312/09 AM2312/07 AM2308/14
Voltage Range 6-10 cells 6-10 cells 6-10 cells
3x Li-Poly 3x Li-Poly 2-3x Li-Poly
Kv Rating 920 rpm/V 750 rpm/V 1,430 rpm/V
Dimensions 28.5 x 28.1mm 28.5 x 28.1 mm 28.5 x 24.1mm
OxL mm (inches) 1.12 x 1.11 inches 1.12 x 1.11 inches 1.12 x 0.95 inches
Shaft Diameter 3.175mm 3.175mm 3.175mm
mm (inch) 0.125 inch 0.125 inch 0.125 inch
Current Range 6-14A 4-12A 6-15A
Current Capacity 17A/60s 14A/60s 17A/60s
Internal Resistance 150mOhms 210mOhms 110mOhms
Propeller APC 9 x 6 APC 10 x 7 APC 7 x 4
Recommended APC 10 x 4.7 APC 11 x 4.7 APC 7 x 5
APC 10 x 7 APC 11 x 7 APC 8 x 3.8
Weight 54 grams 54 grams 43 grams
Specifications
Edition: Model Aviation - 2007/04
Page Numbers: 65,66,67
Edition: Model Aviation - 2007/04
Page Numbers: 65,66,67
Above: The Atlas motor is highlighted by
its finely machined parts and fitted strain
relief on the output wires.
Left: Three nicely packaged Atlas motors;
each version is marked on the end of the
box. These solid outrunners for airplanes
weigh roughly 18 ounces.
IT SEEMS AS though we’re presented with
a new line of brushless motors every week.
Although some are remarkable, others are
forgettable, and my experience with the
three Atlas motors that Hobby Lobby sent
for testing shows them to be undeniably in
the first category.
I tested the AM2312/09, AM2312/07,
and AM2308/14 Atlas motors. Each version
lists for approximately $59, but a recent
check of the Web site showed them to be on
sale for $39.
With quality do-it-yourself kits selling
for roughly the same price, it’s hard to
imagine why I’d build one instead of buying
one of these Atlases. Add the fact that they
come with all the accessories you’re likely
to need, and these motors are a real deal!
Construction: Each motor is an outrunner,
so you’ll be spinning a large propeller
without a gearbox. I found each motor to run
extremely smoothly, with no need for
advanced programming. That means you’ll
save even more money when you shop for
your controller.
The motor’s main shaft is supported by
two ball bearings, as you can see in the photo
where I took it apart. The motor comes apart
easily by removing the circlip from the shaft.
A word of caution: there is no reason
whatsoever to take a motor apart unless
you’ve worn it out and plan to rebuild it. At
these prices I wouldn’t even bother. I took one
apart so you could see the inside, and I hope it
satisfies your curiosity.
The magnets are neodymium and each
shaft is hardened 3.17mm, or approximately
1/8 inch, steel. The numbers in the name
designate the size of the stator and the
rounded-off Kv.
On the Bench: The charts show all the
factory predictions for each motor I tested. I
always take these numbers with a grain of salt
because each motor can vary and
manufacturers often get better numbers than
we do on the bench.
I was pleasantly surprised to find that
my test numbers were very much in line
with the findings on the charts. They aren’t
exact, but it’s about as close as I’ve ever
come to my results matching the marketing
numbers.
You can see on the chart for the
AM2312/07 that predictions are to spin a
10 x 7 propeller on 9.7 volts at 8.9 amps
and see an rpm of 4,685. On the bench I
found that at 9.7 volts the motor drew 9.4
amps but spun the propeller at 4,900 rpm. It
got even better in flight when I hooked up
the Eagle Tree MicroPower data logger.
The same setup in flight showed a drop
to 8.1 amps, and the rpm increased to 5,200
at the same voltage. Bench-testing doesn’t
reveal the amount of unloading a motor
goes through in flight, and even that can
vary depending on the airplane. However,
these numbers are excellent and accurate
for planning, and that’s a nice thing to find.
Each motor comes with all the
accessories you’ll need to mount it behind or
in front of the firewall. This is a welcome
find too because so many of the inexpensive
motors end up costing so much more when
you have to buy after-market
mounts, etc.
The propeller adapter is
a nicely machined
aluminum type. All the
proper screws for
assembly and
mounting are
included along with
the appropriate
Allen wrenches.
The Truth Is in the
Flying: The 2308
series is designed for
airplanes weighing as
much as 16 ounces, and
the 2312 series is for
airplanes weighing as much as
18 ounces. Looking around the
shop, I quickly found a couple models I
could easily mount the Atlases to, and one
of them allowed the use of the MicroPower
logger.
I mounted the AM2308/14 in my
Thunder Tiger Velocity flying wing. This is
a fast little model on a standard ferrite
motor, and it’s downright scary with the
Atlas motor installed.
I went from a 5 x 5 propeller on the
original setup to a 7 x 5. Both setups ran on
a 3S Li-Poly pack, but after the modification
I was spinning a larger propeller
at just more than 10,000 rpm.
The sound alone got my attention,
and it was all propeller noise. Performance
took a climb that has to be seen to be
appreciated, but I was suddenly “on my
toes” trying to keep up.
I mounted the AM2312/07 on my
Horizon Hobby Tribute foamie. I had a
somewhat smaller outrunner on it before
spinning the same 10 x 7 slow flyer
propeller on a 3S Li-Poly pack, so I was
anxious to compare performance. I did pick
up a little weight because I installed the data
logger for some in-flight testing, as I
mentioned.
The performance was excellent and any
3-D maneuver was easy—assuming you can
do them. I’m a lousy 3-D novice, but the
guys at the field who were more than willing
to “test” my setup found it to be a lot of fun.
I didn’t have a dynamometer to give these
motors a true lab test, but I’m an average
everyday flier so that’s the way I
approached the tests. I found the Atlases to
be nicely machined, and the work inside
looked neat and tidy.
The motor in the Tribute has not
exceeded 130° even in our recent 95°
temperatures, but it does hang out in the
open for cooling. The power plant in the
66 MODEL AVIATION
Above: The motor is disassembled for inspection, showing all included
hardware. The 12-pole motor design promotes greater power output.
Left: The included propeller hub is a nice bonus. An AM2312/07 is tested
with a 10 x 7 propeller, shown with firewall mount installed.
The three versions tested required a
12- to 15-amp speed control. The
AM2312/09’s higher wind provides
more torque for the use of larger
propellers.
The Thunder Tiger
Velocity EP is a
Speed 400-size flying
wing. The fastturning
AM2308/14
is a great upgrade.
The performance is
incredible.
+•
Smooth operation.
• All hardware included.
• Excellent propeller adapter.
• Sturdy firewall mount. -•
None noted.
Pluses and Minuses
Velocity is completely enclosed, and a
check with the temperature gun upon
landing shows that it’s running a bit hotter
but not enough to burn your finger.
I like the fact that I didn’t have to go out
and search for mounting hardware or Allen
wrenches to fit the bolts. I think Hobby
Lobby has found a good, inexpensive motor
for the modelers. MA
Greg Gimlick
[email protected]
Distributor:
5614 Franklin Pike Cir.
Brentwood TN 37027
(615) 373-1444
Fax: (615) 377-6948
www.hobby-lobby.com/atlasoutrunners.
htm
April 2007 67
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
9 x 6 Voltage 7.2 8.3 9.4 10.6 11.7 6.8 9.6
Current (amps) 7.2 9.0 10.9 12.8 14.5 6.5 10.7
rpm 5,043 5,603 6,099 5,626 6,891 4,811 6,075
10 x 4.7 Voltage 7.1 8.3 9.4 10.5 11.7 6.8 9.5
Current (amps) 7.5 9.3 11.1 13.0 14.7 6.8 11.0
rpm 4,925 5,468 5,967 6,424 6,807 4,678 5,949
10 x 7 Voltage 7 8.1 9.2 — — 6.6 9.3
Current (amps) 9.4 11.5 13.5 — — 8.5 13.5
rpm 4,364 4,804 5,186 — — 4,173 5,183
ATLAS
AM2312/09
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
10 x 7 Voltage 7.2 8.4 9.6 10.8 12.0 6.9 9.7
Current (amps) 6.2 7.6 9.1 10.5 11.9 5.6 8.9
rpm 3,904 4,349 4,714 5,049 5,329 3,711 4,685
11 x 4.7 Voltage 7.3 8.4 9.6 10.8 12.0 6.9 9.8
Current (amps) 5.8 7.2 8.6 10.2 11.4 5.3 8.5
rpm 4,008 4,465 4,861 5,251 5,564 3,835 5,073
11 x 7 Voltage 7.2 8.3 9.5 10.7 11.9 6.9 9.7
Current (amps) 7.1 8.6 10.2 11.5 12.8 6.3 9.8
rpm 3,586 3,964 4,310 4,539 4,761 3,379 4,239
ATLAS
AM2312/07
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
7 x 4 Voltage 7.2 8.3 9.5 10.6 11.7 6.9 9.6
Current (amps) 6.2 7.8 9.5 11.3 13.1 5.7 9.6
rpm 8,372 9,375 10,286 11,125 11,862 8,037 10,329
7 x 5 Voltage 7.2 8.3 9.4 10.6 11.7 6.8 9.6
Current (amps) 6.8 8.4 10.1 11.9 13.7 6.3 10.2
rpm 8,148 9,141 10,076 10,949 11,712 7,821 10,126
8 x 3.8 Voltage 7 8.1 9.2 10.4 — 6.7 9.4
Current (amps) 8.4 10.4 12.5 14.5 — 7.6 12.5
rpm 7,493 8,292 9,016 9,650 — 7,187 9,017
ATLAS
AM2308/14
An eight- to 12-amp brushless ESC is recommended
An eight- to 12-amp brushless ESC is recommended
An eight- to 12-amp brushless ESC is recommended
Product Name AM2312/09 AM2312/07 AM2308/14
Voltage Range 6-10 cells 6-10 cells 6-10 cells
3x Li-Poly 3x Li-Poly 2-3x Li-Poly
Kv Rating 920 rpm/V 750 rpm/V 1,430 rpm/V
Dimensions 28.5 x 28.1mm 28.5 x 28.1 mm 28.5 x 24.1mm
OxL mm (inches) 1.12 x 1.11 inches 1.12 x 1.11 inches 1.12 x 0.95 inches
Shaft Diameter 3.175mm 3.175mm 3.175mm
mm (inch) 0.125 inch 0.125 inch 0.125 inch
Current Range 6-14A 4-12A 6-15A
Current Capacity 17A/60s 14A/60s 17A/60s
Internal Resistance 150mOhms 210mOhms 110mOhms
Propeller APC 9 x 6 APC 10 x 7 APC 7 x 4
Recommended APC 10 x 4.7 APC 11 x 4.7 APC 7 x 5
APC 10 x 7 APC 11 x 7 APC 8 x 3.8
Weight 54 grams 54 grams 43 grams
Specifications
Edition: Model Aviation - 2007/04
Page Numbers: 65,66,67
Above: The Atlas motor is highlighted by
its finely machined parts and fitted strain
relief on the output wires.
Left: Three nicely packaged Atlas motors;
each version is marked on the end of the
box. These solid outrunners for airplanes
weigh roughly 18 ounces.
IT SEEMS AS though we’re presented with
a new line of brushless motors every week.
Although some are remarkable, others are
forgettable, and my experience with the
three Atlas motors that Hobby Lobby sent
for testing shows them to be undeniably in
the first category.
I tested the AM2312/09, AM2312/07,
and AM2308/14 Atlas motors. Each version
lists for approximately $59, but a recent
check of the Web site showed them to be on
sale for $39.
With quality do-it-yourself kits selling
for roughly the same price, it’s hard to
imagine why I’d build one instead of buying
one of these Atlases. Add the fact that they
come with all the accessories you’re likely
to need, and these motors are a real deal!
Construction: Each motor is an outrunner,
so you’ll be spinning a large propeller
without a gearbox. I found each motor to run
extremely smoothly, with no need for
advanced programming. That means you’ll
save even more money when you shop for
your controller.
The motor’s main shaft is supported by
two ball bearings, as you can see in the photo
where I took it apart. The motor comes apart
easily by removing the circlip from the shaft.
A word of caution: there is no reason
whatsoever to take a motor apart unless
you’ve worn it out and plan to rebuild it. At
these prices I wouldn’t even bother. I took one
apart so you could see the inside, and I hope it
satisfies your curiosity.
The magnets are neodymium and each
shaft is hardened 3.17mm, or approximately
1/8 inch, steel. The numbers in the name
designate the size of the stator and the
rounded-off Kv.
On the Bench: The charts show all the
factory predictions for each motor I tested. I
always take these numbers with a grain of salt
because each motor can vary and
manufacturers often get better numbers than
we do on the bench.
I was pleasantly surprised to find that
my test numbers were very much in line
with the findings on the charts. They aren’t
exact, but it’s about as close as I’ve ever
come to my results matching the marketing
numbers.
You can see on the chart for the
AM2312/07 that predictions are to spin a
10 x 7 propeller on 9.7 volts at 8.9 amps
and see an rpm of 4,685. On the bench I
found that at 9.7 volts the motor drew 9.4
amps but spun the propeller at 4,900 rpm. It
got even better in flight when I hooked up
the Eagle Tree MicroPower data logger.
The same setup in flight showed a drop
to 8.1 amps, and the rpm increased to 5,200
at the same voltage. Bench-testing doesn’t
reveal the amount of unloading a motor
goes through in flight, and even that can
vary depending on the airplane. However,
these numbers are excellent and accurate
for planning, and that’s a nice thing to find.
Each motor comes with all the
accessories you’ll need to mount it behind or
in front of the firewall. This is a welcome
find too because so many of the inexpensive
motors end up costing so much more when
you have to buy after-market
mounts, etc.
The propeller adapter is
a nicely machined
aluminum type. All the
proper screws for
assembly and
mounting are
included along with
the appropriate
Allen wrenches.
The Truth Is in the
Flying: The 2308
series is designed for
airplanes weighing as
much as 16 ounces, and
the 2312 series is for
airplanes weighing as much as
18 ounces. Looking around the
shop, I quickly found a couple models I
could easily mount the Atlases to, and one
of them allowed the use of the MicroPower
logger.
I mounted the AM2308/14 in my
Thunder Tiger Velocity flying wing. This is
a fast little model on a standard ferrite
motor, and it’s downright scary with the
Atlas motor installed.
I went from a 5 x 5 propeller on the
original setup to a 7 x 5. Both setups ran on
a 3S Li-Poly pack, but after the modification
I was spinning a larger propeller
at just more than 10,000 rpm.
The sound alone got my attention,
and it was all propeller noise. Performance
took a climb that has to be seen to be
appreciated, but I was suddenly “on my
toes” trying to keep up.
I mounted the AM2312/07 on my
Horizon Hobby Tribute foamie. I had a
somewhat smaller outrunner on it before
spinning the same 10 x 7 slow flyer
propeller on a 3S Li-Poly pack, so I was
anxious to compare performance. I did pick
up a little weight because I installed the data
logger for some in-flight testing, as I
mentioned.
The performance was excellent and any
3-D maneuver was easy—assuming you can
do them. I’m a lousy 3-D novice, but the
guys at the field who were more than willing
to “test” my setup found it to be a lot of fun.
I didn’t have a dynamometer to give these
motors a true lab test, but I’m an average
everyday flier so that’s the way I
approached the tests. I found the Atlases to
be nicely machined, and the work inside
looked neat and tidy.
The motor in the Tribute has not
exceeded 130° even in our recent 95°
temperatures, but it does hang out in the
open for cooling. The power plant in the
66 MODEL AVIATION
Above: The motor is disassembled for inspection, showing all included
hardware. The 12-pole motor design promotes greater power output.
Left: The included propeller hub is a nice bonus. An AM2312/07 is tested
with a 10 x 7 propeller, shown with firewall mount installed.
The three versions tested required a
12- to 15-amp speed control. The
AM2312/09’s higher wind provides
more torque for the use of larger
propellers.
The Thunder Tiger
Velocity EP is a
Speed 400-size flying
wing. The fastturning
AM2308/14
is a great upgrade.
The performance is
incredible.
+•
Smooth operation.
• All hardware included.
• Excellent propeller adapter.
• Sturdy firewall mount. -•
None noted.
Pluses and Minuses
Velocity is completely enclosed, and a
check with the temperature gun upon
landing shows that it’s running a bit hotter
but not enough to burn your finger.
I like the fact that I didn’t have to go out
and search for mounting hardware or Allen
wrenches to fit the bolts. I think Hobby
Lobby has found a good, inexpensive motor
for the modelers. MA
Greg Gimlick
[email protected]
Distributor:
5614 Franklin Pike Cir.
Brentwood TN 37027
(615) 373-1444
Fax: (615) 377-6948
www.hobby-lobby.com/atlasoutrunners.
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April 2007 67
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
9 x 6 Voltage 7.2 8.3 9.4 10.6 11.7 6.8 9.6
Current (amps) 7.2 9.0 10.9 12.8 14.5 6.5 10.7
rpm 5,043 5,603 6,099 5,626 6,891 4,811 6,075
10 x 4.7 Voltage 7.1 8.3 9.4 10.5 11.7 6.8 9.5
Current (amps) 7.5 9.3 11.1 13.0 14.7 6.8 11.0
rpm 4,925 5,468 5,967 6,424 6,807 4,678 5,949
10 x 7 Voltage 7 8.1 9.2 — — 6.6 9.3
Current (amps) 9.4 11.5 13.5 — — 8.5 13.5
rpm 4,364 4,804 5,186 — — 4,173 5,183
ATLAS
AM2312/09
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
10 x 7 Voltage 7.2 8.4 9.6 10.8 12.0 6.9 9.7
Current (amps) 6.2 7.6 9.1 10.5 11.9 5.6 8.9
rpm 3,904 4,349 4,714 5,049 5,329 3,711 4,685
11 x 4.7 Voltage 7.3 8.4 9.6 10.8 12.0 6.9 9.8
Current (amps) 5.8 7.2 8.6 10.2 11.4 5.3 8.5
rpm 4,008 4,465 4,861 5,251 5,564 3,835 5,073
11 x 7 Voltage 7.2 8.3 9.5 10.7 11.9 6.9 9.7
Current (amps) 7.1 8.6 10.2 11.5 12.8 6.3 9.8
rpm 3,586 3,964 4,310 4,539 4,761 3,379 4,239
ATLAS
AM2312/07
Propeller Battery Six Cells Seven Cells Eight Cells Nine Cells 10 Cells 2S1P 3S1P
Li-Poly Li-Poly
7 x 4 Voltage 7.2 8.3 9.5 10.6 11.7 6.9 9.6
Current (amps) 6.2 7.8 9.5 11.3 13.1 5.7 9.6
rpm 8,372 9,375 10,286 11,125 11,862 8,037 10,329
7 x 5 Voltage 7.2 8.3 9.4 10.6 11.7 6.8 9.6
Current (amps) 6.8 8.4 10.1 11.9 13.7 6.3 10.2
rpm 8,148 9,141 10,076 10,949 11,712 7,821 10,126
8 x 3.8 Voltage 7 8.1 9.2 10.4 — 6.7 9.4
Current (amps) 8.4 10.4 12.5 14.5 — 7.6 12.5
rpm 7,493 8,292 9,016 9,650 — 7,187 9,017
ATLAS
AM2308/14
An eight- to 12-amp brushless ESC is recommended
An eight- to 12-amp brushless ESC is recommended
An eight- to 12-amp brushless ESC is recommended
Product Name AM2312/09 AM2312/07 AM2308/14
Voltage Range 6-10 cells 6-10 cells 6-10 cells
3x Li-Poly 3x Li-Poly 2-3x Li-Poly
Kv Rating 920 rpm/V 750 rpm/V 1,430 rpm/V
Dimensions 28.5 x 28.1mm 28.5 x 28.1 mm 28.5 x 24.1mm
OxL mm (inches) 1.12 x 1.11 inches 1.12 x 1.11 inches 1.12 x 0.95 inches
Shaft Diameter 3.175mm 3.175mm 3.175mm
mm (inch) 0.125 inch 0.125 inch 0.125 inch
Current Range 6-14A 4-12A 6-15A
Current Capacity 17A/60s 14A/60s 17A/60s
Internal Resistance 150mOhms 210mOhms 110mOhms
Propeller APC 9 x 6 APC 10 x 7 APC 7 x 4
Recommended APC 10 x 4.7 APC 11 x 4.7 APC 7 x 5
APC 10 x 7 APC 11 x 7 APC 8 x 3.8
Weight 54 grams 54 grams 43 grams
Specifications