It would depend on the kind of engine used. Even home built jets must use commercially-manufactured engines, as they require precision parts, special metals and fabrication techniques, and are too complex to build at home.
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the flight of the first jet airplane was in Germany
Heinkel in Germany built the first flying jet aircraft.
Frank Whittle invented and built the first Jet Engine.
It depends on the power of the jet engines. The normal cost would be atleast 1 million dollars for a reasonably good power engine. There are also engines less than that cost.
General Dynamics originally built the F-16.
Its depends from comercial to jumbo jets 15000 to 30000 hp
Jet engines can vary in speed depending on the type and size of the engine. Commercial jet engines typically operate at speeds between 9,000 and 25,000 rpm (revolutions per minute). Military jet engines can reach even higher speeds, often exceeding 30,000 rpm.
Boeing uses many jet engines from different manufacturers. Every jet aircraft is fitted with 2 to 4 propulsion engines, usually built by Pratt and Whitney. Every large jet transport also has an APU or Auxiliary Power Unit. These are generally Garrett turbines, this is a small jet engine in the tail unit driving a generator and sometimes a hydraulic pump to give ground power in the absence of airfield units.
Jet powered aircraft have a number of advantages over conventional internal combustion propeller driven aircraft. To start with, jet engines can operate in a much wider range of conditions. Propellers lose their effectiveness at high altitudes and at high speeds while jet engines are capable of operating at much higher altitudes and a much much higher speeds with little or no loss of power. Jet engines have fewer moving parts than internal combustion engines which makes them easier and simpler to design, build, maintain and repair. Jet engines run on fuel that is very similar to diesel fuel, and is much safer to handle and store than gasoline. Jet engines can produce much more thrust power for their weight than conventional reciprocating engines do.
The Me 262 was built by Messerschmitt A G.
If you're referring to the power of the engine, it is not in hertz. The power of of a jet engine is measured in pounds.