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There are a number of engines currently under development for aircraft.
These include:
Prop-fan - a mixture of a turboprop and a turbofan where the fan casing is removed to reveal a 'propeller' like fan, which is placed at the rear of the engine to eliminate the need for long shafts. Prop-fans are proposed to be much more efficient than any existing turbine engine and is designed for use on short - medium range passenger aircraft.
Scimitar: An engine under development by Reaction Engines Limited in the United Kingdom which is designed for use on Supersonic aircraft cruising at Mach 5
It uses Hydrogen fuel and makes use of a pre-cooler which uses the very cold liquid nitrogen fuel to cool the hot, compressed air entering the engine. This makes it extremely efficient at such high speeds.
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