Their lower exhaust speed makes them quieter, but they tend to be larger, resulting in higher drag at supersonic speeds. Higher bypass ratio turbofan engines are more fuel efficient than turbojets. The amount of this air defines the engine’s “bypass ratio”. A turbofan engine, meanwhile, derives most of its thrust from the amount of the air it accelerates with its fan blades. A turbojet produces all of its thrust from its exhaust gas when it is moving at faster speeds. The Colorado-based company is likely to choose between a turbojet and turbofan engine. You’d therefore expect Boom, which is in the prototype stage of developing the Overture, to concentrate its designs on increasing fuel efficiency. Breaking the sound barrier produces a loud sonic boom.īreaking the sound barrier also requires engines which burn through lots of jet fuel – one of Concorde’s key drawbacks and something that’s only become more contentious in recent years.
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