Turbine P160 Graupner 6806 The JetCat P160 model jet engine works in the same way as its full-size counterparts. The single-stage radial compressor sucks in and compresses air, which is then mixed with fuel in the combustion chamber and heated. Combustion occurs, causing the air mass to expand greatly. The hot air then passes through an axial turbine wheel which in turn drives the compressor via a shaft. The exhaust efflux is accelerated to high speed (around 1100 km/hr) and leaves the tail end of the turbine, generating the thrust required to propel the model. An electric starter motor is fitted at the turbine´s intake funnel, and this is used to accelerate the turbine to the speed necessary for it to run. The engine is started and controlled fully automatically via a highly integrated electronic control unit (Jet-tronic ECU) which monitors and regulates the turbines operation by measuring the turbine speed andexhaust gas temperature. Initial ignition of the turbine occurs using propane gas (lighter gas), which is fed to the engine from a miniature refillable tank in the model The gas is supplied to the engine automatically when the starting process is initiated. When ignition has taken place the electronic unit automatically switches the engine to liquid fuel (kerosene). All the electrical components are powered by a separate 6-cell battery; this is used for the auxiliary equipment such as the fuel pump, glowplug, starter etc. The external dimensions and weight of the JetCat P160 model jet engine are approximately the same as those of the JetCat P80 / P120, many thousands of which are now in use. Compared to the P80 / P120 the new engine delivers much higher thrust at around 160 N, and this is due primarily to the new compressor and turbine stages. These parts have been optimised for even higher air throughput, and it is these changes that have made it possible to generate a further increase in power (thrust) from the same size of engine. The enormous output power of this turbine makes it suitable for large models and those with a take-off weight of at least 14 kg. Please note: if it is installed in a lighter model aircraft (e.g. HOT SPOT, KANGAROO, HARPOON), the turbines speed must be limited so that the thrust corresponds to no more than 90% of the models weight. The display / programming unit included in the set features an illuminated alpha-numeric LCD screen (2 lines, 16 characters each), plus 10 operating buttons and 4 monitor LEDs. The GSU (Ground Support Unit) allows the user to read out the current operational data and also change the settings; it can be connected and disconnected when the engine is running. As well as showing the current operational data such as exhaust gas temperature, rotational speed and pump voltage, the GSU can also display statistical information such as overall fuel consumption, total turbine run time, maximum rotational speed, number of starts, duration and fuel consumption of the last turbine run, battery voltage etc. All information is displayed under menu control in a plain language dialogue. The turbine starts and ramps up to speed fully automatically when the operator gives a command from the transmitter. The pilot then controls the desired thrust proportionally using the throttle stick.
The ECU is connected to the receiving system and uses two receiver channels:
channel 1 is used for thrust control (throttle stick); channel 2 is assigned to a 3-position switch on the transmitter (alternatively rotary control or slider).
The three positions of the switch are then used as follows:
Pos. 0 = Turbine OFF: immediate engine cut (switch in back position)
Pos. 1= Stand-by / Start, normal operation (switch in centre position)
Pos. 2= Automatic switch-off (switch in forward position) 1. Disconnect all filler hoses and other connections to the model.
2. Switch on the transmitter and receiver.
3. Carry the model to the take-off site.
4. Move the three-position switch on the transmitter to the centre position.
5. Move the throttle stick briefly to idle, then to the full-throttle position.
6. The turbine now starts completely automatically; after about 30 seconds control is passed to the pilot.(green READY LED lights up). JetCat P160 turbine complete with starting system, Jet-tronic ECU (electronic control unit), GSU (display / programming unit), LED display board, miniature fuel pump, electro-magnetic fuel cut-off valve, electro-magnetic gas valve, fuel hose, quick-release connector set, filler fittings, clunk weight and cable set, power supply 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 control / slider. Thrust 160 N at full load 2.5 N at idle
Weight 1390 g incl. automatic start
Diameter 112 mm
Overall length 285 mm
Rotational speed 32,000 - 128,000 rpm
Mass flow ~0.38 kg/sec
Efflux velocity ~1600 km/hr
Output power 28 kW (jet power)
Exhaust gas temperature ~690°C
Fuel consumption 385 ml/min (full load)
Fuel Jet A1, kerosene
Lubrication approx. 5% synthetic oil added to fuel
Maintenance interval 50 hours
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