ALLEN CARGILL of Warwick,
Pennsylvania, designed and builds a new
CL electronic system that is available in
four-, six-, and eight-channel units. Shown
are the four-channel unit that Allen uses
and the six-channel variation that Joe
Scroczyk of Philadelphia, Pennsylvania,
used for the Piper Twin Comanche I
featured in the April 2008 column.
Both systems are mounted on two-line
Stunt-type handles, and all the controls will be
in your line of sight while flying a model.
There is no need to take your eyes off the
airplane and/or grope for controls such as
those on modified RC systems that hang from
your belt or strap over your shoulder.
The photos of the transmitter systems show
the diverse arrangements that can be built into
a unit. The four-channel setup has all channels
in full proportional operational mode.
The six-channel system made for the Twin
Comanche has two channels of full
proportional operation and four channels
dedicated to on/off switch control. The fifth
switch is the on and off power switch. Control
might be used for proportional for throttle and
landing-gear retraction, landing lights, opening
and closing bomb-bay doors, and dropping
bombs.
The decoder unit, which you can see in the
photo of the six-channel unit, is small and has
connector terminals for the servos and battery.
There’s no need for lead soldering by the user.
The decoder uses the standard RC 4.8-volt
battery for power. The servo connectors on the
board accept Futaba and uni-type plugs.
If a servo is placed some distance away
from the decoder, an extension lead with
proper connectors has to be made. The lead
shown coming from the decoder unit is the
signal lead with a two-pin connector for
connection to the flying lines.
Servos and batteries are not provided with
Allen’s systems. However, more than one
decoder unit is available for any of the three
systems.
Power for the transmitter units is a
standard 9-volt battery that is regulated down
to 5 volts for the output signal. There is an
on/off switch and a red LED on the front panel
of the unit to indicate that the power is
activated. The four-, six-, and eight-channel
units will have the 9-volt battery and its
connection enclosed in the transmitter unit,
rather than featuring the external battery
connection shown in the photo of the fourchannel
unit.
Allen recommends using Futaba and Hitec
servos, but he suggests that any standard RC
servo (1- to 2-millisecond operation) that has
the same connector wiring as the Futaba or
Hitec should work with no problem. The
servos plug directly into the decoder.
As with all electronic systems, there is a
need to use insulated flying lines. A nylon or
non-electricity-conducting bellcrank and
Also included in this column:
• Polen Special racer
• Wanted: Ju-87
isolation of the flying lines at the control
handle is also required. The photos show
two handles that might be used.
Allen’s systems cost $120 for the fourchannel
unit, $135 for the six-channel unit,
and $150 for the eight-channel unit. Their
price is based on the average mix of
proportional and switch operation
arrangements.
Each unit includes a corresponding
decoder. However, if the buyer wants an
additional decoder, the cost is $20-$30 for
the four- to eight-channel units.
The bottom line is that Allen Cargill
will provide four-, six-, and eight-channel
systems that are configured to your
individual specifications. The systems
should satisfy the operational feature
needs of the simple to the most
sophisticated CL Scale model.
All you have to do is let him know how
many proportional channels are needed
and how many must be switch controlled.
Allen Cargill’s contact information is in
the “Sources” list.
Allen Cargill scratch-built the Polen
Special racer, shown in one of the photos,
to a scale of 2 inches = 1 foot, which
produced a wingspan of 44 inches. The
model’s total weight is 44 ounces.
The Polen is powered by an AXi 2820-
series motor and uses a Jeti Advance 40
ESC. Power is supplied by a Thunder
Power three-cell, 3200 mAh battery.
Operational features are throttle, flaps, and
retracts from Robart driven by a Futaba
servo. Allen uses his four-channel system
to control the racer.
Dennis Polen built the unique full-scale
Polen Special in the late 1960s and early
1970s. It made its first appearance at the
EAA (Experimental Aircraft Association)
show in 1973.
Some 20 years later, when Dennis
could no longer fly the airplane, it became
the property of Dick Keyt of Grandbury,
Texas. An American Airlines pilot and an
Air Force veteran with an aerospace
engineering background, Dick flew the
aircraft at various air shows throughout the
next several years.
Equipped with only a four-cylinder
engine and with the ability to attain high
152 MODEL AVIATION
speeds, the Polen Special has been called
one of the most efficient aircraft of modern
times. It holds a world speed record for
500 kilometers of 303.5 mph.
Dick Keyt and the Polen Special have
been honored with the Blériot Medal for
the aircraft’s outstanding contribution to
aviation. The two also had the honor of
participating in the Centennial of Flight
ceremony that took place at Kitty Hawk,
South Carolina, in December 2006.
Wanted: C. Larry McCormack of Novato,
California, wrote that when he was a
teenager, his mother bought him a
Scalemaster Ju-87 Stuka kit for one of his
birthdays and that, sadly, he let it get away
from him before he even started to build it.
The model spanned 45 inches, was
designed for a .35 engine, and was
produced in the 1950s.
Larry has looked everywhere but is
unable to locate one of these kits. He
wonders if someone out there might be
able to help him. If you can assist Larry,
you will find his contact information in the
“Sources” list at the end of this column.
Please send ideas, notice of upcoming CL
Scale events, contest reports, and
especially photos of CL Scale activity to
me at the e-mail address at the top of this
column or to my address listed in the
following. MA
Sources:
Bill Boss
77-06 269th St.
New Hyde Park NY 11040
Futaba
(217) 398-8970
www.futaba-rc.com
Hitec RCD
(858) 748-6948
www.hitecrcd.com
Thunder Power
(702) 228-8883
www.thunderpowerrc.com
AXi motors, Jeti ESCs:
Hobby Lobby
(866) 933-5972
www.hobby-lobby.com
MS Composit
(317) 578-1955
www.mscompositusa.com
Allen Cargill
1218 Alex Ln.
Warwick PA 18974
(215) 431-8524
C. Larry McCormack
2603 Center Rd.
Novato CA 94947
(415) 892-0371
[email protected]
Edition: Model Aviation - 2009/02
Page Numbers: 151,152
Edition: Model Aviation - 2009/02
Page Numbers: 151,152
ALLEN CARGILL of Warwick,
Pennsylvania, designed and builds a new
CL electronic system that is available in
four-, six-, and eight-channel units. Shown
are the four-channel unit that Allen uses
and the six-channel variation that Joe
Scroczyk of Philadelphia, Pennsylvania,
used for the Piper Twin Comanche I
featured in the April 2008 column.
Both systems are mounted on two-line
Stunt-type handles, and all the controls will be
in your line of sight while flying a model.
There is no need to take your eyes off the
airplane and/or grope for controls such as
those on modified RC systems that hang from
your belt or strap over your shoulder.
The photos of the transmitter systems show
the diverse arrangements that can be built into
a unit. The four-channel setup has all channels
in full proportional operational mode.
The six-channel system made for the Twin
Comanche has two channels of full
proportional operation and four channels
dedicated to on/off switch control. The fifth
switch is the on and off power switch. Control
might be used for proportional for throttle and
landing-gear retraction, landing lights, opening
and closing bomb-bay doors, and dropping
bombs.
The decoder unit, which you can see in the
photo of the six-channel unit, is small and has
connector terminals for the servos and battery.
There’s no need for lead soldering by the user.
The decoder uses the standard RC 4.8-volt
battery for power. The servo connectors on the
board accept Futaba and uni-type plugs.
If a servo is placed some distance away
from the decoder, an extension lead with
proper connectors has to be made. The lead
shown coming from the decoder unit is the
signal lead with a two-pin connector for
connection to the flying lines.
Servos and batteries are not provided with
Allen’s systems. However, more than one
decoder unit is available for any of the three
systems.
Power for the transmitter units is a
standard 9-volt battery that is regulated down
to 5 volts for the output signal. There is an
on/off switch and a red LED on the front panel
of the unit to indicate that the power is
activated. The four-, six-, and eight-channel
units will have the 9-volt battery and its
connection enclosed in the transmitter unit,
rather than featuring the external battery
connection shown in the photo of the fourchannel
unit.
Allen recommends using Futaba and Hitec
servos, but he suggests that any standard RC
servo (1- to 2-millisecond operation) that has
the same connector wiring as the Futaba or
Hitec should work with no problem. The
servos plug directly into the decoder.
As with all electronic systems, there is a
need to use insulated flying lines. A nylon or
non-electricity-conducting bellcrank and
Also included in this column:
• Polen Special racer
• Wanted: Ju-87
isolation of the flying lines at the control
handle is also required. The photos show
two handles that might be used.
Allen’s systems cost $120 for the fourchannel
unit, $135 for the six-channel unit,
and $150 for the eight-channel unit. Their
price is based on the average mix of
proportional and switch operation
arrangements.
Each unit includes a corresponding
decoder. However, if the buyer wants an
additional decoder, the cost is $20-$30 for
the four- to eight-channel units.
The bottom line is that Allen Cargill
will provide four-, six-, and eight-channel
systems that are configured to your
individual specifications. The systems
should satisfy the operational feature
needs of the simple to the most
sophisticated CL Scale model.
All you have to do is let him know how
many proportional channels are needed
and how many must be switch controlled.
Allen Cargill’s contact information is in
the “Sources” list.
Allen Cargill scratch-built the Polen
Special racer, shown in one of the photos,
to a scale of 2 inches = 1 foot, which
produced a wingspan of 44 inches. The
model’s total weight is 44 ounces.
The Polen is powered by an AXi 2820-
series motor and uses a Jeti Advance 40
ESC. Power is supplied by a Thunder
Power three-cell, 3200 mAh battery.
Operational features are throttle, flaps, and
retracts from Robart driven by a Futaba
servo. Allen uses his four-channel system
to control the racer.
Dennis Polen built the unique full-scale
Polen Special in the late 1960s and early
1970s. It made its first appearance at the
EAA (Experimental Aircraft Association)
show in 1973.
Some 20 years later, when Dennis
could no longer fly the airplane, it became
the property of Dick Keyt of Grandbury,
Texas. An American Airlines pilot and an
Air Force veteran with an aerospace
engineering background, Dick flew the
aircraft at various air shows throughout the
next several years.
Equipped with only a four-cylinder
engine and with the ability to attain high
152 MODEL AVIATION
speeds, the Polen Special has been called
one of the most efficient aircraft of modern
times. It holds a world speed record for
500 kilometers of 303.5 mph.
Dick Keyt and the Polen Special have
been honored with the Blériot Medal for
the aircraft’s outstanding contribution to
aviation. The two also had the honor of
participating in the Centennial of Flight
ceremony that took place at Kitty Hawk,
South Carolina, in December 2006.
Wanted: C. Larry McCormack of Novato,
California, wrote that when he was a
teenager, his mother bought him a
Scalemaster Ju-87 Stuka kit for one of his
birthdays and that, sadly, he let it get away
from him before he even started to build it.
The model spanned 45 inches, was
designed for a .35 engine, and was
produced in the 1950s.
Larry has looked everywhere but is
unable to locate one of these kits. He
wonders if someone out there might be
able to help him. If you can assist Larry,
you will find his contact information in the
“Sources” list at the end of this column.
Please send ideas, notice of upcoming CL
Scale events, contest reports, and
especially photos of CL Scale activity to
me at the e-mail address at the top of this
column or to my address listed in the
following. MA
Sources:
Bill Boss
77-06 269th St.
New Hyde Park NY 11040
Futaba
(217) 398-8970
www.futaba-rc.com
Hitec RCD
(858) 748-6948
www.hitecrcd.com
Thunder Power
(702) 228-8883
www.thunderpowerrc.com
AXi motors, Jeti ESCs:
Hobby Lobby
(866) 933-5972
www.hobby-lobby.com
MS Composit
(317) 578-1955
www.mscompositusa.com
Allen Cargill
1218 Alex Ln.
Warwick PA 18974
(215) 431-8524
C. Larry McCormack
2603 Center Rd.
Novato CA 94947
(415) 892-0371
[email protected]
