SR-71

Bertie the Bunyip wrote:


Not quite. Though the principle is essentially the same, the engine
has not moving valve at the front. A pulse jet wouldn't be able for
supersonic, let alone hypersonic flight.
the inlet would have an annular inlet arranged so the flow would
direct each pulse down the rear of the engine, but there would be a
small efflux out of the annular inlet. The biggest advantage to this
system is that it's easily throttleable simply by varying the
frequency of the pulses. this thing almost certainly exists. More
than likely it's a development of the Convair Kingfish which was ,
like the A-12, an upshot of project GUSTO, but we're not going to be
told anytime soon! I read about the Kingfish years ago and can't find
anything decent about it on the net, but it was a parasite aircraft
with some sort of ramjet or zip engine that had a ceramic coating and
was capable of cruising at over mach 4. At least one of it's
designers has alluded to it actually having gone ahead, but it's
still a very black item.



I mis-wrote. I should have written Pulse Detonation Engine

http://en.wikipedia.org/wiki/Pulse_detonation_engine

"Gig 601XL Builder" wrDOTgiaconaATsuddenlink.net wrote in
:

http://en.wikipedia.org/wiki/Pulse_detonation_engine

Hmm, amybe I'll try welding one up out of some old drainpipe I have
outside!
I'll never forget the sound of the old dynajets some of the guys had at my
CL field when I was a kid.



Bertie