i want to know the mechanism of a minijet engine(reciprocating type)?with a plan of that engine?

Question

minjet is used on model planes because they are light and need much power to take-off or cruise or landing.I need a plan of that engines.I know there are 2 types of those engines:turbine type and reciprocating type.surely the second type is lighter and i need informations about second type.

Answer 1

Here is a supplier of model aircraft turbine engines. Several thousand dollars each! No plans though.