Turbine P 60 Graupner 6798 The JetCat P60 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. Theexhaust gas accelerates to a very high speed (approx. 1450 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 funnel, 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) 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 gastemperature, 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 ramped up to speed fully automatically on command from the transmitter. Thepilot then pre-sets the level of thrust he requires 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 a3-position switch (or rotary knob or slider).
The three switch positions are as follows:
Pos. 0 = Turbine OFF, immediate cut-off (switch back).
Pos. 1 = Standby/start, normal operations (switch central).
Pos. 2 = Automatic power-down (switch forward). 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. (à green READY LED lights up). Handling a jet-engined model requires the greatest care and considerable technical expertise. Please read the safety notes included in the operating instructions. Turbine power (throttle stick)
Turbine control (Off/Start/Auto-Stop) à 3-position switch or rotary knob/slider. JetCat P60 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 cut-off valve, electro-magnetic gas valve, fuel lines, quick-connect set, refueling and gas filler fittings, fueltank clunk pick-up and cable set, on-board battery (6 cells, 1250 mAh), miniature auxiliary gas tank, turbine mounting clamp (RamTec-compatible), comprehensive operating instructions. Mass throughput 0.15 kg/sec
Efflux velocity 1450 km/hr
Output power 12 kW
Exhaust gas temperature 500 - 680 °C
Speed range 50,000 - 175,000 rpm
Fuel consumption 70 - 190 ml/min
Turbine weight 800 g
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