Turbine JetCat P80 incl Anlei Graupner 6800 The JetCat P80 model turbine works in a similar fashion
to full-size jet aircraft engines. Air is sucked into the
engine and compressed by a single-stage radial compressor.
The air is then mixed with fuel in the combustion
chamber and heated. As the mixture burns, the air
mass expands greatly and is forced out of the engine,
passing through an axial turbine wheel, which in turn drives
the compressor via a shaft. The exhaust gas accelerates
to a very high speed (approx. 1100 km/hr) as it
leaves the tail end of the turbine, and this produces the
thrust required to propel the model. An electric starter
motor is fitted at the front of the turbine´s intake trumpet,
and this motor spins up the turbine to the speed
necessary for it to start running.
The procedure for starting the turbine is completely automatic
using a highly integrated electronic control unit
(Jet-tronic ECU), which also monitors and controls the
engine when running by measuring its rotational speed
and exhaust gas temperature. The turbine
is started using propane
gas which is contained in a refillable miniature tank (lighter gas
canister) carried on the model, and the gas is switched
on automatically as part of the start-up procedure. When
the fuel mixture has been ignited the ECU automatically
switches over to normal fuel operation (kerosene). All the
auxiliary electrical components, i.e. fuel pump, glowplug,
starter etc., are powered by a single 6-cell battery.
The set also includes a display and programming unit
featuring an illuminated alpha-numeric LCD screen (2
lines of 16 characters) plus 10 buttons and 4 monitor
LEDs. The GSU (ground support unit) can be plugged in
and disconnected when the engine is running, so that
you can read off the current operational data and adjust
the settings if necessary.
In addition to the momentary operational data such as
exhaust gas temperature, rotational speed and pump
voltage, the GSU is able to display statistical data including:
overall fuel consumption, total turbine running time,
maximum rotational speed, number of starts, duration
and fuel consumption of the last turbine run, battery voltage
etc. A menu control system based on a plain text
dialogue is used for all displays and input procedures.
The turbine is started and run up to speed fully automatically
on command from the transmitter. The pilot then
pre-sets the level of thrust he wants using the throttle stick; full proportional control is available. The ECU is connected to the receiving system using two receiver channels: channel 1 is used for thrust pre-set (throttle stick), while channel 2 is controlled at the transmitter by a 3-position switch (or rotary knob or slider).
The three switch positions are as follows:
Pos. 0 = Turbine OFF, immediate switch-off (switch back)
Pos. 1 = Standby/start, normal operations (switch central)
Pos. 2 = Automatic switch off (switch forward)
Example of a typical start procedure:
1. Disconnect all refueling lines and outboard connections from the model.
2. Switch on transmitter and receiver.
3. Carry model to take-off strip.
4. Set three-position switch on transmitter to centre.
5. Move throttle stick briefly to idle, then to full-throttle position.
6. The turbine now starts fully automatically, and after about 30 seconds the green "READY" LED lights up to indicate that the pilot has full control of the running engine. JetCat P80 turbine complete with starter, Jet-tronic ECU (electronic control unit), GSU (ground support unit - display and programming unit), LED display board, miniature fuel pump, electro-magnetic fuel shut-off valve, fuel lines, quick-connect set, refueling and gas refilling fittings, fueltank clunk pick-up and cable set, on-board battery (6 cells, 1250 mAh), miniature auxiliary gas tank, turbine mounting clip (RamTec compatible), comprehensive operating instructions. Turbine power (throttle stick)
Turbine control (Off/Start/Auto-stop)
-> 3-position switch or rotary knob/slider. Handling a jet engine requires the greatest care and considerable technical expertise. Please read the safety notes included in the operating instructions. Thrust: 82 N at full load
2.5 N at idle
Weight: 1300 g incl. automatic starter
Diameter: 112 mm
Overall length: 297 mm
Rotational speed: 35,000 - 117,000 rpm
Air throughput: ~ 0.28 kg/s
Output power: 12 kW (jet power)
Exhaust gas temperature: ~ 580°C
Fuel consumption: 250 ml/min (full load)
Fuel: Jet A1, kerosene, diesel
Lubrication: approx. 5% synthetic oil, mixed with fuel
Maintenance interval: 50 hours
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