model aircraft turbines use propane/butane gas along with a glow plug to
start the ignition and rise the burner's temperature above 100oC
before liquid fuel is injected through small holes into the burner.
Once the combustion gets started, the glow plug is no longer
The combustion process may be controlled or stopped by regulating the
amount of the fuel available, the amount of oxygen available or the
source of heat.
Unlike the conventional combustion/piston engines, the jet engines don't
have a natural limitation of the rpm. This means that the rpm will
keep rising as more fuel is fed to the engine until the materials no
longer withstand the high temperature and/or the high rpm and will
Therefore, an Electronic Control Unit (ECU) is required to limit
the max fuel flow. The max value is set by using an external
device called Ground Support Unit (GSU).
Since model aircraft powered by gas turbines flies very fast, with
speeds up to 500Km/h (312mph), these type of engines are definitely not
recommended for the beginners. Besides, operating gas turbines also
involves some risks. So, it's highly recommended to read the
operational guide before using these engines.