Compressors, Gas Turbines and Jet Engines
In the aircraft propellers

Propulsive matter is ejected from within the propelled body
All of these
The propulsive matter is caused to flow around the propelled body
Its functioning does not depend on presence of air

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Compressors, Gas Turbines and Jet Engines
Producer gas is produced by

Carbonisation of coal
Passing air and a large amount of steam over waste coal at about 65°C
Passing steam over incandescent coke
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

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