Helicopter mechanics
with model turbine engine
34
Safety notes
•
Turbines may damage your hearing; always wear ear protectors when operating these
engines!
•
This engine must not be operated in a confined space!
•
When the turbine is running keep your hands at least 15 cm away from the area of the
intake trumpet. The engine develops a very powerful suction force in this area, which is
perfectly capable of sucking a hand, finger or other object into the spinning compressor in
an instant. Keep this potential hazard in your mind at all times!
•
When the jet engine is running, never look, reach or walk into the area of the hot exhaust
gas efflux.
•
When running the jet engine always ensure that no persons, animals or movable objects
are in the plane of rotation of the engine (hazard zone!)!
•
It is essential to keep a C0² fire extinguisher to hand at all times!!!
•
Before you run the engine, remove all loose objects from the area of the intake duct. This
applies to cleaning cloths, screws, nuts, cables and any other miscellaneous objects.
•
Check in particular before you run the engine for the first time that you have not left any
small loose items in the inlet duct, such as waste materials from building the model, odd
screws or even sanding dust. Loose parts can very quickly enter the turbine and cause
serious damage.
•
When installing and working around the turbine in the model, seal the intake and efflux
openings of the engine with wide parcel tape or similar, to avoid dust, scrap material and
other detritus entering the turbine accidentally.
•
Ensure that the fuel you use contains about 5% turbine oil.
Use only special, non-coking fully synthetic oils.
Castrol TTS fully synthetic oil is not suitable, as it is incompatible with turbine fuel!
•
Before starting the turbine always ascertain that there is no fuel in the turbine.
Maintenance
A build-up of dust and oil deposits on the compressor nut may cause the starter unit coupling to
slip, or fail to engage properly. If this should happen, you can eliminate the problem by cleaning
and de-greasing the compressor nut (e.g. using cellulose thinners or similar solvent on a
paintbrush). You can check that the starter unit is working properly when the turbine is in the
"OFF" state by pressing the "IGNITION" button.
The maintenance interval of the turbine is around 50 hours. When the engine has completed
this period of running, it should be sent to the factory for checking, complete with the control
electronics. The total run time of the turbine can be read off in the "STATISTIC" menu.
Exhaust gas duct system
The exhaust duct you use must have an internal diameter of at least 70 mm. A larger outlet
diameter is even better, as the residual thrust declines in direct proportion to the outlet area.
If you use a bifurcated exhaust duct the internal diameter of each pipe must be 55 mm or larger.
A larger outlet diameter is even better, as the residual thrust declines in direct proportion to the
outlet area.
If the duct is of smaller diameter than stated, the result is higher exhaust gas temperature, and a
loss of potential maximum power from the turbine.
Содержание JetCat 6810
Страница 31: ...31 Bedienungsanleitung ...
Страница 101: ...31 Operating Instructions Graupner Jetcat Modell Helicopter Turbine PHT 3 ...
Страница 107: ...37 Wiring diagram fuel pump and starter glowplug Connections overwiew of the turbine s operating components ...
Страница 171: ...31 Instructions d utilisation ...
Страница 177: ...37 Schéma de connexion Pompe à carburant et Starter Bougie Connexions des éléments de commande Généralité ...
