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Got the idea hearing a jet fly overhead at the same time
as a Harley drove by under full throttle. The sound was
nothing short of amazing. Only thing missing was the
impressive chugga-chugga sound of an old steam engine
running balls out.
The turbojet would blow through the boiler providing
steam for your steam engine and the whole thing would
augmented by an internal combustion engine. Not sure
many GPM (gallons per mile) this would get, but I'm
assuming it would be a lot.
Or maybe not. Either way that wouldn't be the point.
sound this baby would make would be amazing.
[goldbb, Jul 27 2015]
||Now THAT would be loud! Of course you're talking in
addition to, not in place of the turbojet.
||The think would be to have these all contained in one
chassis. I'm picturing a radial piston on the outside
perimeter, a turbofan inside that and the pulse jet in the
middle. Then I guess you could have the steam pistons on
the outside of the radial engine.
||Theyre orders of magnitude different in sound
volume for the same distance. Last summer I was
recording four channel
sound a lot down by the dock front near where I live,
opposite the airport. It was handy for recording the
(free and available) panoramic sound of jets
taking off (and turboprops, which are often even
louder, especially when landing).
||Theres also the patrol cars running up and down the
strip, faster than theyre legally allowed to on the
street, and whilst
you can easily hear them alone across the dock water
on a clear day (and the fire engines,
when they trundle up on a drill to douse the fake
plane that catches fire), with a jet taking off
theyre nowhere near registering any volume on the
||//Theyre orders of magnitude different in sound volume
for the same distance.//
||You raise a good point. They'd have to be sound balanced
by matching their size appropriately.
||I would assume an 6 foot tall 5,000 hp radial engine
would be about the same volume as two foot long pulse
jet. The steam engine would have to be massive to get
over the roar of this and the turbine engine.
||That of course would relegate the noisy little pulse jet to
noisemaker status since it would add very little thrust to
the contraption. In other words, their noise to thrust
ratios would be
wildly off. But we're not concerned with a logical design
||Of course nobody's mentioned the obvious missing piece
here, the mighty Goddard engine. (as it should be called)
Kerosene and liquid oxygen slammed together in a
combustion chamber is going to be louder than all these
things combined unless you make it pretty darn small.
||This would end up being a very loud, powerful, fast
moving sculpture more than an actual mode of
||If you make your pulse jet too short, would it not produce
an unpleasantly high pitched noise?
||Also, Goddard's engine used gasoline, not kerosene.
||Perhaps what you want to do is take an regular internal
combustion engine, add a turbocharger to it, then connect
the wastegate to a pneumatic noise generator.
||No, that would be just silly.