Cleaner Flying - A2 Hydrogen-Powered Hypersonic Airliner

The A2 designed to carry up to 300 passengers from Brussels to Sydney in under 4 hours. The speedy airliner will benefit from a 2-mode engine — turbojet and ramjet propulsion systems — that will make it both extremely efficient at slow speeds and able to reach top speeds with great ease. Used in quick succession, these 2 modes allow the A2 to seamlessly shift from Mach-2.5 to Mach-5; a cooling system wrapped around the engine — which includes an extra turbine compressor — prevents the turbines from getting excessively hot.

Reaction Engine says - Flying will never be faster — or greener

Supported in part by a grant from the EU’s Long-Term Advanced Propulsion Concepts and Technologies project (Lapcat), the Mach-5, or 3,400 mph, A2 concept is in many ways the spiritual successor of the late Concorde but differs in two important respects: range and engine efficiency.
Via Treehugger

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