reply to post by sealteamsix
Hi sealteamsix,
I agree with you in that I don't believe that the Aurora existed, I also believe that any short term hypersonic aircraft will be using combined cycle
engines, as Intelgurl has pointed out with the P&W press release (nice one Intelgurl).
However, where do you get your data about PDE's? I think you are confusing PDE's with pulsejet engines? PDE are amongst the most efficient engines
due to their mechanical simplicity and thermodynamic efficiency.
Whilst pulsejets use a similar principle, they work via deflagration (burning) of fuel, whereas Pulse Detonation Engines........PDE's......actually
detonate the mixture.
It's a bit like comparing gun powder to plastic explosive, one burns very fast, the other detonates via a shockwave and releases much more energy for
a given mass.
I would say that should PDE's ever be developed to run smoothly and reliably, then they will be more efficient than combined cycle engines, and much
cheaper to produce. (but bloody loud!)
Cheers
Robbie