Jet Central Rabbit User manual

OPERATION AND
MAINTENANCE MANUAL

January, 2009 1
INTRODUCTION
JET CENTRAL produces the most advanced micro turbines available today: smaller,
more powerful, faster acceleration, less fuel burn, lower temperatures, higher quality,
less maintenance and the best price. JET CENTRAL, an ISO 9000 Company is a full
production engine manufacturer, producing high quality parts to be assembled into
the newest line of micro turbines....
We are committed to our turbines in a way never seen before. You won’t find a more
knowledgeable company in micro turbines to turn than to JET CENTRAL.

January, 2009 2
TABLE OF CONTENTS
1. SAFETY INFORMATION……………………………………………………………………………….....………3
1.1 SAFETY RULES……………………………………………………………………………….……………….5
2. TURBINE SYSTEM COMPONENTS DESCRIPTION…………………………………….……………………6
2.1 PARTS LIST……………………………………….……………………………………………………………6
2.2 TURBINE……………………………………………………………………………………………….…….….7
2.3 I.C.S………………………………………………………………………………………………………………8
2.4 FUEL / OIL SYSTEM…………………………………………………………………………………………...9
2.5 STARTING GAS SYSTEM……………………………………………………………………………………..9
2.6 KEROSTART SYSTEM…………………………………………………………………………………………9
2.7 HAND DATA TERMINAL (HDT)……………………………………………………………………………….9
3. TURBINE SYSTEM INSTALLATION INSTRUCTIONS…………………………………………………….…10
3.1 I.C.S…………………………………………………………………………………………………………….10
3.2 PUMP/STARTER BATTERY…………………………………………………………………………………11
3.3 RADIO RECEIVER……………………………………………………………………………………………11
3.4 THERMOCOUPLE………………………………………………………………………………………..…..11
3.5 FUEL PUMP LINE OUT………………………………………………………………………………………12
3.6 RPM SENSOR…………………………………………………………………………………………..…….12
4. PROGRAMMING THE I.C.S…………………………………………………………………………………...…17
4.1 FIRST SCREEN………………………………………………………………………………………………..17
4.2 MAIN SCREEN…………………………………………………………………………………………………17
4.3 SECONDARY SCREEN………………………………………………………………………………………18
4.4 MENU SCREEN…………………………………………………………………………………………..……18
4.5 START SUBMENU FOR GAS START……………………………………………………………...……….19
4.6 START SUBMENU FOR KEROSTART…………………………………………………………….……….20
4.7 INFO SUBMENU……………………………………………………………………………………………….21
4.8 RADIO SUBMENU……………………………………………………………………………………….…….23
4.9 RUN SUBMENU………………………………………………………………………………………..………26
4.10 LAST RUN SHUTDOWN REASON………………………………………………………………...………27
5. RADIO LINK FAILSAFE…………………………………………………………………………………………..28
6. STARTING THE ENGINE…………………………………………………………………………………..…….29
7. PROPER RANGE CHECKING……………………………………………………………………………..…….35
8. FUEL AND FUEL SYSTEM CARE……………………………………………………………………...……….36
9. MULTIENGINE INSTALLATION…………………………………………………………………………………37
10. MAINTENANCE…………………………………………………………………………………………...……….38
11. TROUBLESHOOTING…………………………………………………………………………………………….39
12. IMPORTANT UPDATES…………………………………………………………………………………………..41
13. ECU LEARNING PROCEDURE…………………………………………………………………………….……42
14. WORLDWIDE SERVICE………………………………………………………………………………………….43
15. LIFETIME TURBINE WARRANTY………………………………………………………………………………44

January, 2009 3
1 Safety Information
The JET CENTRAL TURBINE ENGINES are in its own right a single stage centrifugal flow
gas turbine engine, configured to operate as a TURBOJET ENGINE for use mainly, but not
exclusively, in remotely piloted fixed wing aircraft. Such aircraft and their control systems
must be appropriately designed and constructed to be compatible with the performance of the
TURBOJET ENGINE.
NOTE: The airworthiness, structural design, integrity of the aircraft and its control systems
are the entire responsibility of the owner/builder/operator. JET CENTRAL and its agents
cannot accept responsibility for any failure, structural or otherwise, of the aircraft or its control
systems. JET CENTRAL and its agents cannot accept responsibility for any inappropriate or
unauthorized use of the JET CENTRAL ENGINE.
The JET CENTRAL gas turbine engine is a very safe, easy to operate unit. The JET
CENTRAL is a state of the art gas turbine engine and all components are manufactured
within the highest standards. If operated correctly it will provide years of reliable, trouble-free
service, with low maintenance.
It cannot however, be stressed highly enough, that the operating instructions be fully
understood before attempting to operate your engine. Any alterations to the engine
whatsoever, without the written consent of JET CENTRAL, will render any warranty
null and void and as a consequence the controlling body in your country may not grant
approval for use.
The JET CENTRAL gas turbines are high performance TURBOJET ENGINES that need
discipline, commitment to correct and safe operation. With other persons present while
operation, the TURBOJET ENGINE ALWAYS ENFORCE THE PROPER SAFE DISTANCES
FROM THE TURBINE!
The recommended minimum safe distances are:
In front of the turbine: 15 feet
Beside of the turbine: 25 feet
Behind the turbine: 25 feet
Fire extinguishers should be on hand at all times. JC recommends CO2variety. To avoid
hearing damage, always use hearing protection when near a running turbine engine. When
the turbine is running never place your hands closer than 6 inches into the area of the intake.
An EXTREME SUCTION, which can grasp a hand, fingers or other objects in a flash,
prevails in this area. Be aware of this danger always!

January, 2009 4
Prevent foreign materials from entering the intake when working the turbine. Before
operation, make sure there are no lose parts or debris near the turbine. Objects being sucked
in can cause severe damage.
Always exercise caution around the hot parts of the turbine, to avoid burns. The outer case at
the turbine stage and nozzle reaches 400 - 500ºC (750 - 950 ºF), while the exhaust gas may
exceed 600º C (1290 ºF).
Assure that the fuel is mixed with the correct amount of synthetic oil for the specific engine.
Use only synthetic turbine oils always.
Use common sense when operating model turbine jet aircraft. Never operate in or around
heavily populated areas, and in or around areas experiencing drought or dryness.

January, 2009 5
1.1 Safety Rules
Rule 1 Never run your engine indoors; always ensure you are in the open air.
Ensure non-associated persons are at least 9 meters (10 yards) away from
the engine when running. Always have a fully operational CO2fire
extinguisher available and ready for use when starting and running your
engine.
Rule 2 When bench running or engine starting in an airframe; never allow yourself
or another person to stand behind or in the rear quadrant of the engine.
Always ensure the exhaust of the engine is directed away from persons and
property as the heat of the engine exhaust can cause damage and injury.
Rule 3 Air will save the engine, in the event of a hot or failed start always isolate
the fuel to the engine, but always keep the start air running to the engine,
this will clear the engine of residual fuel and will keep the core of the engine
cool. If you are using the Electric starter, once again isolate the fuel supply
to the engine and keep the starter running. Do not be afraid to use your fire
extinguisher, a CO2extinguisher will not harm the engine in any way. A
hand held blower is another good safety item to have on hand during the
start up and shut down of the motor.
Rule 4 Never attempt to start a flooded or wet engine, this will result in a hot or wet
start and you will have flames. To dry out or clear the engine, stand it tail
pipe down and either run the starter motor or blow air through the engine
until all residual fuel has been blown out of it.
Rule 5 Always start the engine with the nose of the plane pointed into the wind and
shut down with the nose pointed into the wind also.
Rule 6 In the event of a hot start, or sever engine fire, close the throttle and the trim
lever to the fully back position and turn off the fuel isolation valve, this will
allow the engine to clear itself, be ready to use your fire extinguisher. A CO2
type extinguisher will not harm the engine in any way; if a dry powder
extinguisher is used and the powder is ingested into the engine then you
must return the engine to our service department.

January, 2009 6
2 Turbine System Components Description
2.1 Parts List
Before starting installation of the engine please check the contents against the parts list. If
any part is missing or damaged, contact JET CENTRAL or their agent in your country for
correction. DO NOT substitute missing or damaged parts as this will void your warranty and
your country’s controlling body’s approval for use.
1 - Turbine Engine
1 - I.C.S. Unit
1 - Clear Fuel Line 4mm.
1 - Clear Kerosen Line 3 mm.
1 - Battery Li-Manganese
1 - Hand Data Terminal (HDT)
1 - Plug (4mm.)
1 - Manual
Box #1 with:
1 - Fuel Pump
1 - Fuel Valve
1 - Kerosen Valve
1 - Nylon Strap
1 - Fuel Pump Mount
Box #2 with:
1 - Festo “T” Connector (4mm.)
1 - On/Off Festo Valve (4mm.)
1 - Straight Festo Connector (4mm.)
1 - Straight Festo Connector (3mm.)
1 - One Way Festo Connector (4mm.)
1 - Fuel Filter
1 - RPM Extension
1 - Temp. Extension
1 - Power Extension

January, 2009 7
2.2 Turbine
It is a single shaft turbojet with an annular combustor. A single stage axial flow turbine drives
a single stage centrifugal compressor. The shaft is supported by 2 fuel/oil lubricated pre-
loaded angular contact bearings. The turbine speed is controlled by the amount of fuel
received from the fuel pump, which is controlled by the I.C.S.
Turbine Specifications
Bee II
Rabbit
Cheetah
Rhino
Mammoth
Thrust Class
7 Kg (15.5 Lbs)
@185,000 RPM
8.6 Kg (19 Lbs)
@152,000 RPM
14 Kg (31 Lbs)
@ 130,000 RPM
16.3 Kg (36 Lbs)
@ 117,000 RPM
21.5 Kg (48 Lbs)
@ 104,000 RPM
Full Throttle
Fuel
Consumption
0.24 Lt/min
(8.1 Oz/min)
0.31 Lt/min
(10.4 Oz/min)
0.47 Lt/min
(16 Oz/min)
0.52 Lt/min
(17.5 Oz/min)
0.70 Lt/min
(23 Oz/min)
R.P.M. range
55,000-185,000
40,000-152,000
35,000-130,000
30,000-117,000
28,000-104,000
E.G.T.
500°C - 700°C
(932 -1292°F)
500°C - 700°C
(932 -1292°F)
500°C - 700°C
(932 -1292°F)
500°C - 700°C
(932 -1292°F)
500°C - 700°C
(932 -1292°F)
Weight
0.880 Kg
(1.94 Lbs)
with starter
1.0 Kg
(2.2 Lbs) with
starter
1.360 Kg
(3 Lbs)
with starter
1.700 Kg
(3.75 Lbs)
with starter
2.240 Kg
(4.9 Lbs)
With starter
Diameter
82 mm
(3.228 inches)
91 mm
(3.582 inches)
102 mm
(4 inches)
111 mm
(4.37 inches)
124 mm
(4.881 inches)
Length
232 mm
(9.13 inches)
245 mm
(9.645 inches)
250 mm
(9.842 inches)
300 mm
(11.8 inches)
349 mm
(13.74 inches)

January, 2009 8
2.3 I.C.S.
The I.C.S. (intelligent Control System) is a total system for the control of a model gas turbine
engine. Its main function is to control and regulate the fuel pump, providing the turbine engine
with the necessary amount of fuel for safe and controlled operation.
The I.C.S. measures the exhaust gas temperature, the relative position of the throttle stick
and the rotor speed. It monitors all of the controls necessary to guarantee that the engine
stays between the user-defined parameters of operation, also providing fail-safe shutdown of
the engine when it has detected any important anomaly. In order to make this assessment,
the I.C.S. has a RPM sensor, a thermocouple input, a throttle servo input, power connections
for the fuel pump, starter, glow plug, fuel and gas valves, battery and a digital (RS232) serial
port to program and read the data in real-time to a PC.
The measurements made by the I.C.S. are:
Temperature of the exhaust gas
Pump battery voltage
Width of the throttle pulses from the radio
transmitter
Engine rotor RPM
Engine run time
External analog signal
All of these measurements can be read into and displayed on the Hand Data terminal (HDT)
that is connected to the I.C.S. by a RJ-45 connector, or into a personal computer through a
RS232 adapter. The configuration/setup parameters are stored in the I.C.S. by the HDT or
the PC.
Features:
RPM input: Magnetic sensor up to 250,000 R.P.M.
Temperature range up to 1000ºC using a "K" type thermocouple
PWM control of 8192 steps for pump
Build-in electronic brake for the starter motor to help the clutch to disengage
Blown glow-plug detector
Adjustable glow-plug power
Adjustable gas flow
Elapsed engine run timers
Status LED on the unit plus 2 more remote on option
RS232 interface to interface to a PC
Black box function. Record the engine measures each 0.5 sec up to 51 minutes
Used mAh counter
Bad RC pulses (glitches) counter

January, 2009 9
2.4 Fuel / Oil System
The Fuel/Oil is pre mixed together. Where the fuel line connects to the motor a T-fitting sends
some of the Fuel/Oil to the bearings and the rest is sent to the fuel nozzles in the combustion
chamber. It is important to filter the fuel and use proper types of fuel in the turbine Engine.
Without proper filtering one or more of the injector needles could become clogged, thus
affecting the proper running of the engine. Only synthetic turbine engine oil is to be used and
MIXED TO THE PROPER AMOUNT of 2.5% or 16 US ounces per 5 US gallons fuel.
2.5 Starting Gas System
When you choose “AUTO – GAS” option in the Start Menu.
In the initial start sequence, the motor uses propane or a propane/butane mixture. This
system uses an onboard gas tank and a solenoid valve to deliver the gas to the combustion
chamber, the glow plug is powered momentary to cause ignition. When certain parameters
are meet the fuel solenoid valve is opened by the I.C.S. and then fuel is used to bring the
engine to the proper idle RPM during the remaining ramps. The gas valve is automatically
closed when a certain RPM is reached during the fuel ramp.
2.6 Kerostart System
The main difference between gas and kerosene is that in the case of a failed ignition, the gas
dissipates quickly on the air and don't keep inside the engine. Kerosene is liquid and, if
unburned, will pool inside the engine and stay there forever. The engine can hold a big
quantity of kerosene inside. This kerosene will be ignited on next successful start up and will
be pushed to the exhaust as soon as the airflow inside the engine is sufficient, and will be
ignited in the exhaust, causing a hot start (in extreme cases a big fireball) that will not hurt the
engine, but can destroy the model.
2.7 Hand data Terminal (HDT)
The Hand Data Terminal is simple and easy to operate. The HDT is used to read the different
information and to program certain parameters in the I.C.S., this is a link between the user
and the I.C.S. Make sure to take the necessary time and learn the operation, as this is the
only exact way the operator can monitor and check that the turbine is running properly. The
unit is small and compact, but always remove it before flying.
Note: If you leave it installed, remember it uses power from your RX battery.
HDT