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The jet engine?
1. There are theoretical limits to the speed of propellor-driven aircraft.
2. There are practical limits to the power of propellor propulsion.
3. Piston engines, for given output, are large, and need cooling.
The jet engine can propel aircraft at supersonic speeds, can be scaled up to very large powers, especially by using fan/ bypass technology, and the jet turbine can be made self-cooling by the large volumes of air it consumes.
One example of a jet turbine's superiority over piston engines is the Chinook helicopter, which uses two turboshaft (jet engine with a shaft connection) to drive its large rotors. This design is superior to using piston engines.
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