)
O
~ElM
RIVERSI
~SANTAANA
VISTA, CALIF.
HOME OF KRAFT SYSTEMS, INC.
SAN DIEGO
facility
intrllducUon
Those who did not start radio control during its early stages
cannot appreciate its progress. Today our control systems
approach perfection in control accuracy and response, and
with capable pilots, our aircraft last for years. These compact! lightweight, and versatile systems permit projects of
a scope limited only by our imaginations.
The first commercial radio control equipment produced in
the early 1950's was by today's standards unbelievably
crude. One, or sometimes two, tubes were employed to
give a modest current change to a heavy relay. The relay
switched a clock type escapement driven by tightly wound
rubber bands which provided a sequential type of control.
One blip gave right rudder, two blips left. If the last command position was forgotten, one had to guess at what
control came next.
A pound or more of batteries were required and since they
were not rechargeable, flying was expensive. The simple
receivers were relatively non-selective and! therefore, subject to a variety of interference. A great flying session was
one where we succeeded in making a few turns in some
way similar to our commands and returned with a repairable aircraft.
In the late 1950's, resonant reed equipment
had been
developed to a fairly high degree of reliability in the hands
of a skilled mechanic. Four control functions were available
and although control was not proportional, a skilled pilot
could "blip-blip"
his way around the sky through surprisingly good maneuvers. Equipment was still very heavy and
required extensive maintenance.
Early attempts at proportional
control in the !50's used
rapidly wagging controls and were called "pulse-proportional."
Only two proportional
control functions were
available and operation was very unreliable.
In March 1959, the first Kraft radio was introduced
soon became the most popular unit of its kind.
and
By the early 1960's! reed type equipment had been developed to a high degree of reliability and relative miniaturization. Some of this equipment is still in use today.
In 1964 the Kraft KP-4 introduced the modern era of radio
control with a reliable, lightweight! and accurate proportional system.
From the beginning, the Kraft name has stood for quality,
reliability, performance! advanced design, and dedication to
customer satisfaction. As a result, the company has grown
to become the world's largest manufacturer of radio control
equipment. Your purchase of a Kraft product is protected by
the sound business judgment! integrity! and financial stability of the company behind it. Radio control manufacturers may come and go! but we will be here tomorrow to
service the product we sell today.
CUFF WErRICK
EXECUTIVE
JE
DOUG SPRENG
Y
CONSULTING
ENGINEER
DESIGN
ENGINEER
P"IL KRAFT
PRESIDENT
VICE-PRESIDENT
~ I _,
r
---
I
..._
Since their introduction, Kraft proportional sets have won
more major contests than all competition combined. A few
of the recent victories include four consecutive wins at the
United States Nationals; 1969, 1970, 1971, and 1972
Grand National Championships; first in 1967 and 1968
World Championships; second in 1969 and 1970 World
Championships; third in 1970 and 1971 World Championships (top placed U.S.Team member); first in both divisions
of the 1970 Las Vegas International Air Races; first In both
Formula I and II at the 1970 Nationals; first in Scale at the
1970 Nationals; first in Formula I in 1971 and 1972 Nationals, etc. In addition, Kraft sets hold most of the world records in various categories, such as endurance, altitude,
glider records, boat speed records, etc.
This outstanding record could only have been achieved with
a system of great accuracy and dependability. Most proportional owners fly purely for pleasure but they have the
assurance that their enjoyment and progress are not limited
by the performance of the radio control system.
Equally important to the product is the attitude of the personnel in all phases of the company. Ours recognize that
customer service is essential to business success. If you call
or visit Kraft Systems, the person who greets you will not
only be pleasant and courteous, but sincerely interested in
helping you in any way possible. Your complete satisfaction is our primary goat
Most of our male employees are active radio control
modelers. Th~s is very important because it better enables
them to understand our customers' needs.
Kraft Systems has the most experienced and talented group
in the industry. CliffWeirick won the United States National
Championship twice; was a two-time member of the United
States World Championship F.A.I. Team; was a former
National Goodyear Racing Champion; won the 1970 Las
Vegas International Pylon Race; is the current National
Formula I Racing Champion; and was a past President of
the Academy of Model Aeronautics.
Phil Kraft, President, was twice United States National
Champion; won the 1967-1968 World Championship;
placed second in the 19~9-1970 World Championship; was
a former National Goodyear Racing Champion; and placed
third in fhe 1971-1972 World Championship.
Doug Spreng, Design Engineer, was twice National Champion; a member of the 1967-1968 World Championship
United States F.A.1.Team; and is a designer of several
famous contest aircraft. More important than these achievements in the contest field is his origination of the concepts
basic to all of today's digital proportional systems.
Consulting Engineer Jerry Pullen designed and flew the first
successful feedback proportional system and is responsible
for many of the technical innovations which make possible
today's highly reliable proportional systems.
This unequaled combination of expenence is your assurance of the finest possible product.
DONNA and JANlCE - Receptionists
MARTHA - Accounting
UBlNIO - Accounting
DARLENE No. 1 lind DARLENE No.2; New and Repair orders
Considering the sales volume and number of invoices processed, Kraft Systems has a relatively small office staff. However, many of the accounting functions are computerized and
the general procedures are highly systemized for efficiency.
As a service oriented company, this means that our customers
receive prompt acknowledgments
of all orders, either for
new units, accessories, parts, or repairs. A daily record is kept
of all repairs in process and invoices are processed swiftly and
accurately. Efficiency means service.
JOHN SOiNaDMJUm
- Controller
~~~fjj;"'_=~
MARTY BARflY- Customer Relations
BARBARA- Secretary to the President
GERI- Secretary
On this page are pictured some of the people in our
Repair Department. No other factor is more important
to continued enjoyment of radio control than service.
Kraft Systems recognized this from the beginning and
established a reputation for service unique in the industry. Perhaps because we are enthusiasts ourselves, we
better appreciate the needs of our customers. Therefore
we emphasize speed, fairness and quality in all of our
service dealings. In recent years we have established a
world-wide
network of service stations. See your favorite radio control magazine for current listing.
JIM WITT
FLORA
GEORGI "tUHN
CONNIE
Our Engineering staff is constantly at
work experimenting with methods of
adding utility to and improving reliability of our products. This group has
throughout the years originated most
of the important electronic developments in proportional radio control.
This is indeed a broad statement but
absolutely true. Innovation and originality have played an important part
in the tremendous growth of Kraft
Systems.
MIkE Gtt.OERTSON - Technical Director
JAY JUNiPER
DOUG
SPRING
ED SUSZ\'NlKI
It is the responsibility of Dan Lutz
and his assistants to see to it that the
many thousands of components making up today's complex radio control systems flow smoothly through
the inventory and production cycle.
This is important to our customers
not only for reasonable delivery time
on new system orders, but also to
ensure that accessory and service
item orders can be filled promptly.
We stock repair parts and accessories
in depth for even the very earliest
model sets.
The production volume and financial
position
of Kraft Systems makes
possible the procurement of many
custom components specifically designed for our particular application.
Component selection is determined
by quality, performance, and source
integrity; component price is the last
item considered.
DAN LUTZ - Purchasing
A constant emphasis on quality is the key characteristic
of our production departments. Incoming components
are inspected and selected where necessary. Circuit
boards are machine wave soldered to eliminate the variables of hand soldering, to ensure uniformity, and to
minimize component heating. A" printed circuit board
assemblies are carefully examined with a 50 power
microscope.
After the circuit boards have been wired to their mechanical assemblies, they are completely inspected again before they pass on to the production technicians for yet
another inspection. Series Seventy-Three transmitters and
receivers are aligned and temperature cycled by the production technicians before being connected to a special
burn-in fixture, which turns them on and off electronically at least 15,000 cycles during the 24-hour minimum
test cycle. This cycling treatment serves as an accelerated
aging process to seek out defective components. After
this process, the probability of component failure becomes extremely low.
The complete system is now realigned and temperature
cycled again. A very comprehensive series of tests are
performed and these are checked off on a sheet which
accompanies the system from then on. The sheet is
signed by the senior technician performing the test and
the set then becomes his personal responsibility.
Final system inspection is performed by an inspector responsible only to top management. Each set is completely gone through and examined for mechanical integrity,
DON and VERN - Production Supervisors
RANDY
JOHN
JEKRY and
JA(](
MW
and LARRY
smoothness of servo operation, control stick feel,
response, and general appearance. A complete
operational range check is performed and transmitter output is re-evaluated. Any shortcomings
are logged and, if necessary, the set is returned
to the responsible technician for correction and
re-testing.
Finally, the Shipping Department cleans the system and carefully packs it with the appropriate
accessories checked
which is included.
off against the packing list
The complexity of the electronic systems with
their thousands of purchased components
precludes perfection, but not because we don't try.
New testing and production methods are constantly being explored to achieve the highest
possible standard of reliability. The Kraft reputation for quality is not accidental.
~:if:
"~~~1j
~f·~~.;"
.1:I1!iW''_~~
P1ttNTW CIRCUrr BOARD ASSEM8LY
01
recehnog ~~
stockrOom
l·"·~
~~~
Chuck Hayes, Manager of the Plastic Products Division, is a master in the design and
tooling of intricate plastic parts. His division is an integrated operation from diemaking to finished assemblies. Its components, particularly servo mechanics and
control stick assemblies, are widely used by radio control manufacturers throughout
the world. The proprietary line of quality radio control accessory items has met with
great success and is being rapidly expanded.
CARL HAMMONS - Mechanical
JOHN RICHARDS - Illustration
Engineering
& Graphics
BENNY
BLOCK CONNECTOR
ASSFM81 Y
JOE MARTIN
Headed by Joe Martin, this division supplies Kraft Systems with precision connectors specifically designed for
the demanding requirements of radio control. It is also
engaged in the development of many new experimental
products and has introduced what we believe to be the
first truly practical retractable landing gear for radio controlled model aircraft.
I
I
We have continued in 1973 with our objectives of producing
the finest possible radio control equipment permitted by the
state of the art. To achieve this goal, we were able to draw
upon the talents of an engineering staff who pioneered the
concepts used in all of today's proportional
radio control
systems and the production experience gained in producing
over 35,000 sets.
SUMMARY
OF FEATURES FOR SERIES SEVENTY-THREE
• Four and six channel sets have been increased to five and
seven channels at no extra cost.
• Precision open gimbal type control
available.
sticks are optionally
• Precision closed control sticks have a specially developed
potentiometer providing accuracy of better than 1/2 % with
improved smoothness and feel.
• All Kraft Systems feature very low current requirements.
Actual flight time per full charge exceeds 2112 hours when
using the KP-SB or KP-7B system with five servos.
• Specially designed, heavy-duty, vibration
resistant bar
teries are standard throughout and virtually eliminate batte
problems.
• A convenient
fast-charge battery system is standard.
• A positive locking antenna retracts into the five and sev
channel cases for convenience and safety.
• The versatile dual output transformer-isolated
batte
charger will charge receiver and transmitter batteries ind
pendently or simultaneously.
• Training interconnection
seven channel systems.
system is standard with five a
• We offer the industry's broadest selection of servos, tra
mitter configurations, receiver types, and accessories.
• Accelerated aging and extensive testing procedures
prove reliability.
im
• New design transmitters with relocated controls furth
improve an already excellent design. These transmitters a
carefully designed for proper balance, ensuring better co
trol and minimum fatigue.
• Field proven dual conversion receiver is optionally available and highly recommended in areas where interference
is a problem.
• Three completely new servo mechanics are available with
new gear trains designed to withstand the most severe shock
and overloads. One version has been specifically designed
for high power, slow speed applications and features 18
pounds of static thrust.
• New, improved standard receiver circuitry has been designed with a low drain integrated circuit decoder for greater
simplicity and reliability.
• A two-position landing gear switch has been provided f
added convenience on five and seven channel transmitte
• The single-ended, 3 -wire servo system will continue to
operate when one battery is dead or shorted (very unlikely
with the new type battery cells).
• A remote charging jack is incorporated in the switch ha
ness to permit convenient battery charging without th
necessity of removing wings or hatches.
• Remote electronic frequency switching is optional on aI
models, except the dual conversion receiver and open gimb
models.
• The unitized block receptacle in the receiver has a positiv
locking tab preventing accidental plug disconnection.
• Our precision connectors are built by us and have be
designed for the demanding requirements of radio contra
FlVE-CHANNEl
AIRBORNE SYSTEM
KPS-12 SERVOS
(ROTARY OUIPUT)
KB-4E
BATTERY PACI(
ON/OFF
SWITCH,
KPR-58
RECEIVER
CHARGE
RECEPTACrE
!
I•
seriessn.·three systems
FIVE AND SEVEN OfANNn
SYSTEMS
Available in either the dual stick or single stick configuration, these sets provide all the control functions required
for even the most complex models. Systems include everything necessary for radio control:
transmitter,
receiver,
servos, rechargeable transmitter and receiver battery packs,
charger, switch harness, all hardware, and servo mounting
trays.
A five channel system will operate five servos (one servo is
used for each control function).
A seven channel system
will operate seven servos.
NOTE: Four servos of your choice are included in the system price for both five and seven channel sets.
are self-neutralizing
but can be converted to a positionabltype stick by simply removing the centering springs. TIr.:
third channel is actuated by a lever located on the front G
the transmitter
case.
The KP-3S features the precision two-axis
mechanicalJ
trimmable
Kraft control stick. This stick is located on the
right-hand side of the transmitter case and is self-centering
on both axes. The third channel is actuated by a lever located on the upper left-hand side of the transmitter face
Both systems include transmitter,
receiver, rechargeable
transmitter and receiver battery packs, charger, two servo'
of your choice, switch harness, and hardware.
DUAL FREQUENCY
THREE CHANNEL
SYSTEMS
The KP-3B and KP-3S have answered the demand for high
quality systems for use where a greater number of channels
are not required.
The KP-3B utilizes two single-axis mechanically
trimmable
Kraft control sticks. The left stick moves in a vertical plane,
and the right one ina horizontal plane. Both of these sticks
Dual frequency
switching
is optional
with all systems
except those ordered with the dual conversion receiver and
open gimbal models. This permits either of two adjacen;
frequency channels to be switch selected without the necessity of removing the receiver from the installation
or the
usual fumbling
with crystals. This feature is primarily
intended to facilitate competitive
racing.
COMPLETE
7 OtANNEl
;
-,
~
I-I
SYSTEM
I
These very compact designs feature perfect balance and
feel. The hands position comfortably and naturally over
the controls promoting maximum guidance accuracy and
minimum fatigue. Featuring the custom quality of Kraft
control sticks, transmitters are available in either two-stick
or single stick configurations. These controls have chrome
plated, hand-lapped actuating bails with a centerless ground
chrome plated ball for exceptional smoothness and long
life. Mechanical trim controls for the four primary functions
are conveniently located, easily operated, and do not affect
control stick position.
Optionally available in the two-stick 7 channel configuration are precision open stick gimbals preferred by many
fliers.
Antennas on the five and seven channel models retract into
the transmitter case for convenience during transportation.
The retracted antenna is also disconnected so that interference to other systems is virtually eliminated should the
switch be left on accidentally. In the up position, the antenna is securely locked and repeated use will not affect its
mechanical integrity.
All Series Seventy-Three transm itters feature a heavy-duty
shock and vibration resistant rechargeable battery pack.
These packs incorporate a fast charge feature enabling complete recharging in less than six hours.
The transmitter cases are formed from heavy-gauge, long
wearing vinyl-covered aluminum. Electronic components
are conservatively rated for reliability and long life. RF output is extremely high combined with very low harmonic
radiation.
Five channel sets may be factory converted to seven channels when desired.
TRAINER SVSTIMS
All five and seven channel transmitters incorporate a train
ing system originated by us. This gives the beginner chance to learn without the usual discouragement an
expense of crashes. For training purposes, two transmitte
are connected together by a cable which is plugged into
the same receptable used for battery charging. Transmitte
need not be on the same frequency and may be four, fiv
six, or seven channels, and the system is interchangeabl
between Mode II and Single stick. During operation, th
instructor retains control until he pushes a button tran
ferring control to the student "slave" transmitter. As Ion
as the instructor holds down the transfer control button, th
student has full control. If the student gets into troubl
the instructor releases the button and assumes control, pr
venting an accident.
The trainer interconnecting cable is not supplied with s
tems but is available separately as an option.
AllXlUAaY
CONTROL
Five channel transmitters include one switch selected auxil
iary channel. Seven channel transmitters include one switc
selected auxiliary channel and two proportional channel
The switched channel is most often used for retractabl
landing gear which requires a positive up and down contro
The proportional controls are used for any other auxilia
functions.
lllAlNER
SYSTEM
t
I
TRANSMfITER CONTROLS
(MOOl: II SHOWN; MODE I
HAS nmOTTLf
l~
I II
,i
AND ELEVATOR REVERSED)
TRANSMmER
CONTROLS
ELEVATOR TRIM
KP-3BX and KP..3SX THREE CfiANN£L SYSTEM
(Third S~tvo is optional and not included in system price)
HVEN CHANNEl
KPT-1Z OPEN GIMBAL TRANSMITTER
rlolVers
The standard three, five, and seven channel Series Seventy-Three
receivers are the same size. The optional dual conversion receiver
is of similar shape but is slightly larger in size. The cube shape of
these receivers is the most adaptable to various installations. The
unitized plug system offers light weight, improved reliability, and
greater convenience
by eliminating
the bulky wiring harness.
Servo plugs are securely held in place by a locking tab, but will
pull loose without damage in the event of a crash. Jumper cables
may be ordered if servos are to be installed a great distance from
the receiver.
The connector block and connectors designed and built in our
factory have been specifically developed for the demanding requirements of radio control use. Sockets are gold plated beryllium
copper, crimp connected to machine cut and stripped wire. The
plastic plug body extends over the wiring insulation preventing
stress at the junction between the pin and the wire. Not only is
this wiring method inherently more reliable than soldered connections, it also ensures uniform quality.
Electronically, the receiver design has been refined over the years
to a high degree of performance and dependability.
In 1973, the
RF section has a new layout for even greater performance im-
KPR-5B
provement. A new integrated circuit decoder provides
reliability through simplicity and very low current requirer
No other standard radio control receiver exceeds its abif :
perform accurately under adverse conditions.
DUAL CONVERSION
RECEIVER
Although virtually standard for all quality VHF receivers, the
conversion design has not heretofore been used for radio co;
because of its increased complexity
and more difficult
de
However, certain areas of the country have interference prob!
on specific frequencies, or a band of frequencies, that serio
limit the sport of radio control.
Field proven through extensive testing and production
in 1
the KPR-7D dual conversion receiver has proven itself to be
superior. Since the interference problem is increasing, it is h'
recommended for those areas where standard receivers have
proven reliable. It has virtually no image, harmonic, or other
ious responses. This receiver is available only in the seven q
nel version and can be matched with three, five, or seven char
systems replacing the standard receiver at extra cost.
KPR-7BX (Dual Frequency)
PLUG LOCKING TAB
STANDARD
RECEIVER
\
DUAL FREQUENCY
RECEIVERS ARE
.29 INCHES LONGER
I,.___._ l06
j
-+1
I
",.1
1.17
ACTUAL ~ZE
0.30
:=======-2.-24====-=--=--=--=--=.""-_-L
r
DUAL
1.29
CONVERSION
RECEIVER
-I
1~--1.32---.j
lE CONVERSION
lOCK DIAGRAM
RECEIVER
i"'------_l
....FI
0.30
----2.77-----
..
ACTUAL SIZE
DUAL CONVERSION
RECEIVER
BLOCK DIAGRAM
The reliability of the pencell type rechargeable batteries
previously used, particularly under vibration, has been very
poor. In fact, batteries have been a major cause of failures
in all radio control systems. Fortunately, a new type cell
has been designed specifically to withstand high vibration
and shock. This cell also has a superior seal design, increased capacity, and generally improved performance.
Field experience in 1972 has shown that the new design
has virtually eliminated battery problems. As a result, for
KB-4E BATTERY PACK
1973 we will continue to offer only packs utilizi
heavy-duty cell. The standard pack is the 550 MAH
Because of many requests for an increased capacity
for applications such as long duration gliders and
stunt and scale aircraft, we will continue to offer the 1
MAH KB-4F. Both packs are of the fast charge type and
be fully charged in less than six hours for the KB-4E
less than twelve hours for the KB-4F.
~
BATTERY PACK
The standard KBC charger is a versatile dual output charger
which is transformer-isolated for safety. The transmitter and
receiver battery packs may be charged simultaneously or
independently, and the charge rate can be easily altered if
required.
A new battery charger designed to operate from an automobile cigarette lighter plug is now available. Its transistor
regulated design features constant current output regardless
of variations in the automobile's battery voltage. It is a dual
charger type, providing independent or simultaneous charging of transmitter and receiver battery packs. This charger
(KBC-A) can be ordered for either fast or slow charge rates.
A 10' cord is supplied for convenient charging outside the
vehicle.
-rrChIlIS
KBC-A BATTERY CHARGER
DC SATIERY CHARCfR
KB-4F BArrERY PACK
K8-4£ BATTBlY PACK
i
1
1.00
1.89
t
ACTUAL SIZE
ACTUAL SIZE
1
2.
1.80
1~---1.89---"
'_---1.89---"
All Kraft Series Seventy-Three servos use an integrated circuit amplifier designed by Kraft Systems. This is the result
of over three years of development and represents the ultimate in digital servo amplifier design. It should not be
confused with other integrated circuits used by competitive
manufacturers. Fifty-seven transistors, five diodes, sixtythree resistors, and two capacitors are housed in the integrated circuit package to produce centering and tracking
accuracy better than 1/2 %, virtually zero drift with changes
in temperature and voltage, uniform duty cycle in both
directions, smoothness, and excellent damping characteristics. The design incorporates a bridge type output which
means that the servo motor operates on the full battery
voltage and that only three wires are required for operation.
This permits system operation even though one battery cell
may be dead or shorted. For 1973, there has been further
improvement
with a new integrated circuit processing
method which has resulted in even lower current drain.
Six different
servos are available to suit a variety of appli-
cations. Each servo is electronically
interchangeable
and
features the same full throw, instant response, accuracy, and
high power which have long made Kraft servos the standard
of the industry. To accommodate the greater power available from the new servo amplifier, the servo mechanics in
the KPS-10, KPS-11, and KPS-12 have been strengthened.
For 1973, three new servo mechanic designs have been
added.
The newcomer to radio control is often confused about the
relative merits between the linear output and wheel output
servos. The linear rack type has the advantage that the control push rods move in a straight line which, in some cases,
makes linkage installation less complicated. However, we
feel that the wheel output servo is by far the most versatile
and recommend it because it provides a convenient means
of adjusting the amount of throw required for differential
movement; also, it provides a locking action in the case of
1800 travel.
KPS-11 SERVO
The KPS-11 provides the versatility of both rotary and
dual linear outputs with small size and rugged mechanical design.
Weight:
Static Thrust:
Transit Time:
Available Outputs:
KPS-11
1.9 ounces
Over 5.5 Ibs. with 10 ohm motor
0.5 seconds for .625/1 linear travel
1 rotary wheel or rotary arm
2 linear racks
1_----
SERVO
2.38 IN. -------1
2.52 IN. ---~~,..
'-----ACTUAL SIZE
r
1.55 IN.
j
1---
I
\
2.02 IN. -----
...
~
1CPS-12
KPS-12 SERVO
This is our smallest, lightest digital proportional servo. Despite its small size, it features full throw and high power, and
is suitable for miniature and moderate-duty applications.
Weight:
Static Thrust:
•
0.73 IN.
Transit Time:
Available Outputs:
•
l~
ACTUAL SIZE
smvo
1.2 ounces
Over 4.5 Ibs. with miniature 12 ohm
motor
0.5 seconds for 100° rotary travel
1 rotary wheel or rotary arm
KPS-14 SERVO
KPS-14 SERVO
This is a new servo specifically designed to provide
miniaturization
with the ruggedness to withstand even
unreasonable abuse. This is highly recommended as a
general purpose miniature servo.
Weight:
Static Thrust:
Transit Time:
Available Outputs:
I-
1.4 ounces
Over 4.5 Ibs. with miniature 12 ohm
motor
0.5 seconds for 100° rotary travel
Rotary arm or rotary triangular fittings
2.01 IN. ---
.....--11
0.39 IN.
-1
t------
2.15 IN. ------I~
1.49 IN.
I
il
~L69IN--1
KPS-.15 SERVO
KPS-15 SERVO
This servo has been designed to replace the KPS-10 in new
installations. It also has a new gear train design of tremendous strength which should prove virtually indestructible
in field use.
~2JlIN~
_l
I
I
Weight:
Static Thrust:
Transit Time:
Available Outputs:
0.46 IN.
l.49 IN.
'---'-----' _j_
r ----l
U61N
1.8 ounces
Over 5.5 Ibs. with 10 ohm motor
0.5 seconds for 100° rotary travel
Rotary arm or rotary triangular fittings
KftS..16 SERVO
Basically, this servo is the same as the KPS-1S but with additional gearing to provide 18 pounds of static thrust. Its tremendous power greatly simplifies mechanical linkages used
for such applications as retractable landing gears. Because
of the additional gearing, the transit time of the servo is
slow, making for greater realism in applications for which
it is intended.
Weight:
Static Thrust:
Transit Time:
Available Outputs:
2.1 ounces
Over 18 Ibs. with 10 ohm motor
3 seconds for 1800 rotary travel
Rotary arm or rotary triangular fittings
KPS-16 SERVO
1-1------
2.11IN·-----tl
_L
0.46IN.
!---1.76IN. -----I
~1
...
SERVO TRAV, STYLE 1
(KPS-12 SHOWN)
SERVO TRAV, STYLE 2
(KPS-11 SHOWN)
TYPE OF
SERVO
TRAY
PART NUMBERS
KPS-9
STYLE1
STYlE 2
AILERON BRACKET
(KPS-11A SHOWN)
KPS-10
KPS-11
S10M-1
KPS-12
KPS·14
KPS-15
KPS-16
S12M-2
S14M-2
S15M-2
S15M-2
S9M-1
S10M·2
S11M-3
S12M-3
S14M-3
S15M-3
S15M-3
AILERON
BRACKET S9M-2
S10M·3
S11M-1
S12M-1
S14M-1
S15M-1
S15M·1
series seventy·three
AIRBORNE SYSTEMS
Complete airborne system weight
servos and KB-4E battery pack:
!
KPT-5B
with
four
KPS-11
KPT-5S
KPT-7B
.
.
KP-5B
14.1 ounces
KPT-7S
KP-7B
14.2 ounces
KPT-7Z
As above with four KPS-12 servos:
WEIGHT
63,4"
X
6"
6%"
(including
X
2"
X
61/2" x 2"
antenna):
KP-SB
11.3 ounces
KPT-3B
1 lb. 12 oz.
KP-7B
11.4 ounces
KPT-3S
1 lb. 13 oz.
Complete KP-3B airborne system weight with two KPS11 A servos and KB-4E battery pack
9.9 ounces
As above with KPS-12 servos
8.9 ounces
KPT-5B
2 lb.
4 oz.
KPT-5S
KPT-7B
KPT-7S
2 lb.
2Ib.
2 lb.
4 oz.
6 oz.
6 oz.
KPT-7Z
2Ib.120z.
TRANSMITT'E'RS
R.F. Input Power (nominal)
R.F. Output Power (nominal)
825 mw
500 mw
Approx. current drain
Temperature range
100 ma
0-150oF
Modulation:
Pulse position type 1.4 ms pulse spacing
at control neutral. Pulse time stability ±1% 0-140°F
and over the useful operating voltage of the power
pack. All transmitters use 9.6v 550 MAH high reliability
nickel-cadmium
battery packs.
I.F. Frequency:
455 KHz
Current Drain (5 channel): 20 ma
Usable Sensitivity (O.Sv detected): 3/Lv nominal
Selectivity:
3 db down at 3 KHz
Image Rejection: -2 db
Spurious and Harmonic Rejection:
x
53/a"xS%" 2"
-50 db min.
Noise Limiting: Series clipper and pulse integration
provides high immunity to shot and ignition noise.
Temperature Range: 0-150°F
Semiconductors
(Receiver):
SIZE:
~~~~~~ ::::::::::::::::::::}
RECBVERS - KPR-18, KPR-5B, KPR-1B
5-Bipolar
2-Silicon
Silicon
Diodes
Transistors
SIZE:
~~m'. >
Semiconductors (7 channel logic):
2-Bipolar Silicon Transistors
3-Silicon
Diodes
2-lntegrated
Circuits
First Conversion:
455 KHz
3 Stage High "Q" preselector for superior
and image rejection
Image rejection-greater
than: -60 db
rejection-greater
harmonic
than:
3 db down at 3 KHz
Noise Limiting: Series clipper and pulse integration
provides high immunity to shot and ignition noise.
Temperature Range: 0-150oF
Semiconductors (Receiver):
2-Dual Gate Metal Oxide Semiconductor
Field Effect Transistors
5-Junction Field Effect Transistors
2-Silicon
Diodes
Silicon Transistors
Semiconductors
2-Bipolar
Silicon Transistors
1-Silicon
Diode
2-lntegrated
\
(7 channel logic):
Circuits
KPR-3B
1.6 ounces
KPR-3BX
KPR-5B
KPR-5BX
2.0 ounces
1.6 ounces
2.0 ounces
KPR-7B
1.7 ounces
KPR-7BX
2.1 ounces
KPR-7D
2.4 ounces
IECEIVBl BA rrERY PACKS
than: -90 db
Other spurious response rejection-greater
-80 db
3-BipoJar
2.77" x 1.29 " 1.32"
WEIGHT:
Current Drain (no signal): 20 ma max.
Current Drain (with signal): 21 ma max.
Usable Sensitivity (O.5v detected): 2-3 p'v
Selectivity:
2.55/1x1.10"x1.20"
.
10.7 MHz
Second Conversion:
Harmonic
225", ,,0"".20"
1
KPR-3BX
KPR-5BX
KPR-7BX
KPR-7D
DUAL CONVERSION RECBVEI-KPR-1D
1
KB-4E 550 MAH (milliampere hours) Fast Charge
Size: 2.25" x 1.89" x 1.0"
Weight: 4.6 ounces
KB-4F 1000 MAH (milliampere hours) Fast Charge
Size: 1.89" x 1.89" x 1.8"
Weight: 7.1 ounces
SERVOS
All servos feature ±0.25% positioning
tually zero drift from 0° to 160°F.
COM'ATlBJUTY Of
accuracy and vir-
snvos
Series Seventy-Three integrated circuit servos are compatible with Series Seventy-One and Series Seventy-Two
sets but not earlier models. All earlier model servos (1967
and later, with proper plugs) are compatible with the
1973 receivers. However, 1972-1973 servos and earlier
servos cannot be mixed.
THE SPORT SERIES LINE HAS BEEN DESIGNED TO MAKE AVAILABLETOP
PERfORMANCE AND QUALITY TO THE AVERAGE RADIO CONTROL ENTHUSIAST. THE DESIGNS ARE NEW ANO HAVE BEEN SPECIFICALLY DEVELOPED FOR SIMPLICITY AND RESULTANT- RELIABILITY. ALTHOUGH
THE SPORT SERIESSYSTEMS DO NOT OfFER THE VERSATILITYAND OPTIONS AVAILABLEWITH THE KRAFT SERIfS .SEVENTY-THREE LINE, THEY
ARE OF IDENTICAL QUALITY AND RELIABILITY, BACKED BY THE KRAFT
REPUTAnON FOR SERVICE.
(~
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1
SPORT SERIES
-I
KP..5
FIVE CHANNEL
SYSTEM
KPS-11A SERVO
I
The KPS-11A servo is
supplied as standard
with the KP-5 system.
It is the same as the
KPS-11except the rack
outputs are not furn[shed and the resulting
production economies
are reflected in a lower
price.
".
In the few short months since its introduction, the KP-5
has become dominant in the low priced, multi-channel
field. It is truly a superior product, featuring simplicity
and great reliability. The KP-5 is available in the twostick, Mode II configuration only, although it may be
easily converted to Mode I by the purchaser if desired.
This system provides aU the control functions required
Z
-.....::.----~....J,11
fOT even complex models and is supplied with everything
necessary for radio control: transmitter with 'liuilt-in_
charger for both fransmitter and receiver batterY packs,
receiver, four KPS"11Aservos, transmitter and receiver
rechargeable battery packs, switch wired into battery pack
lead, and-all hardware.
An economical 9 volt dry battery
powers the transmitters and should
last a season's normal use.
The receiver and servos have been
integrated into one rugged nylon
case which mounts easily with
four screws.
KP-lIJ
K'-2S
KP-2B AND KP-2S TWO CHANNEL SYSTEMS
Introduced in 1971, the KP-2B and KP-2S have become virtually standard in the glider
and boat field, and are well suited for any application requiring two proportional
functions such as cars and small powered aircraft. The reliability and superior performance of these systems resulted in their having virtually no competition in this
field. The transmitters are available in either the two-stick or single stick configuration.
The KP-2B utilizes two single axis mechanically trimmable Kraft control sticks. The
left stick moves in a vertical plane, and the right one in a horizontal plane. Both of
these sticks are self-neutralizing,
but can be converted to a positionable type stick
by simply removing the centering springs. The KP-2S features the precision two-axis
mechanically trimmable Kraft control stick. This stick is located on the right hand side
of the transmitter case and is self-centering on both axes.
A wired battery box is provided
and is designed to use four alkaline pencell batteries. These batteries will give well over four
hours of continuous use.
An optional rechargeable receiver
battery and charger are available
at extra cost.
DUAL FREQUENCY
Dual frequency switching is optional on the KP-2B and KP-2S.
This permits either of two adjacent
frequency channels to be switch
selected without the necessity of
removing the receiver from the instarIation or the usual fumbling
with crystals. This feature is primarily intended to facilitate competitive racing.
ICPR-2B
RECEIVER-SERVO
ANT.
f
0.850IN.
•
ACTUAL SIZE
~---
3.550 IN.----~
11---2.975 IN. ---_"'I
1.42 IN.
~1.665
r
\
IN.~
r
KPR-5
S CHANNa
CONFIGURA-TION
IS FOR MODE U.
'SPORt SERIES RECEiVER
SHOWN
THROlTLE AND ELEVATOR
ARE REVERSED FOR MODE I
2,08IN.
t
t
0.81IN.
r-I
(
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I
0,90IN'j
12~21IN.
L
KPR-2B •..•••••.••••..•••••.••.••••••
KPR-2BX .•.••...•••.••..••.••••••••••
KPR-5 •.•••.•.....••.•••••.••••••••••
snvos
/
4;9 ounces
5.1
2.0
ounces'
flunces
,
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