My favourite sound...

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Really? I always thought
View: https://www.youtube.com/watch?v=KEnOeITKZAA.

Actually, Muller, that's a great example of a Merlin roaring by.

I think its great (almost poetic) that each country's "champion fighter" had its own sound.
It was another mark that denoted what it was and what it stood for.

The Allisons, The Merlins, The Daimlers....heck, even
View: https://www.youtube.com/watch?v=akTQN_4YcPY

Seriously, how many of us have caught ourselves running out of the house, looking up, like some astonished 5-year-old, when we hear the "pop-pop-pop" that can ONLY come from a radial engine.



...and speaking of radial engines and low passes (as seen on Muller's vid), did I ever tell you guys about the time a friend and I were driving around?
Well, a friend and I were driving around one afternoon and we came upon this house that was under construction.
He was all into housing ideas back then, and seeing how no one was around, we stopped and took a little tour of the place.
I remember standing in what we figured was probably the master bedroom when I hear something.
I motioned him over to the large opening I was looking out of and told him to watch and he'd see an old airplane fly over.
He asked how I knew, and I mentioned the sound off in the distance that was steadily getting louder was from a radial engine, and that usually mean "old airplane".

...oh yeah, we saw an old airplane alright...

It was a B-25 in full dress (minus the guns) doing about 200 knots and 10 feet off the tree tops!

Other than the day the B-29 was delivered to the Museum of Flight and buzzed the shop I used to work at (along with two P-51 escorts) and the free airshow I got for my 18th birthday, that was about the coolest thing I've ever seen!

Funny how well the trees can mask the sound of an engine(s). I could tell it was approaching, but sounded like it was still a fair distance off, then WHOOM! it erupted out of the trees and came right over us.

A memory I shant soon forget.





Elvis
 

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There is also that special sound an engine takes on with turbocharging.

It just sounds right on some planes, but if I get to see any P-47 flying even w/out turbo I'm not going to complain. ;) I'll just be a little extra happy if it has one. :) Hey, the closer to authentic the better. (within reason, there's safety to think of, of course)


Correct me I I'm wrong, but this one sound's like it's got a turbo:
View: https://www.youtube.com/watch?v=Wi1d4P774eE



And here's a long one:
View: https://www.youtube.com/watch?v=lKr2dsz9PlE
 
There is also that special sound an engine takes on with turbocharging.

It just sounds right on some planes, but if I get to see any P-47 flying even w/out turbo I'm not going to complain. ;) I'll just be a little extra happy if it has one. :) Hey, the closer to authentic the better. (within reason, there's safety to think of, of course)


Correct me I I'm wrong, but this one sound's like it's got a turbo:
View: https://www.youtube.com/watch?v=Wi1d4P774eE



And here's a long one:
View: https://www.youtube.com/watch?v=lKr2dsz9PlE


Kool Kitty, are you referring to "turbo whine"?
That high pitched schrill the supercharger makes as it spools up.

I can hear it on this one better -
View: https://www.youtube.com/watch?v=zYUXAKSl8Ps

...and this one especially -
View: https://www.youtube.com/watch?v=t_CaOmKUztY




Elvis
 
No I don't mean turbo whine, in fact the normal centrifugal superchargers will make a similar siren like whine when spooling up. I meant the partially muffeled "whuffle" sound the engine makes.

And as you just demonstrated that sound is not unique to turbochargers, but the mechanical centrifugal superchargers as well.
 
Here is a fantastic link with a few warbird films (some shot on old 8mm/16mm cameras). The sound quality is great on some of them - in particular that Pratt Whitney Double Wasp in the P-47 'Little Demon' film and the Packard Merlin in the 'P-51 at Oppenheim' film 8)

LINK

Enjoy!
 
Yeah, they're most common in turboshaft engines, but a few smaller engines use it too, where lower cost, weight, complexity and maintenence are preferred over aerodynamic efficiency. Plus there are some more advanced designs using "diagonal compressors" and axi-centrifugal desings (axial stages following centrifugal), somtimes with fan stages as well. They also are much more rugged, and tolerant to ingestion of foreign material.

What do you think powers the T-37? (granted the A-37 switched to the J85) Turbomeca Marboré - Wikipedia, the free encyclopedia
Fouga Magister - Wikipedia, the free encyclopedia same thing.
MarboreIIsideview.jpg


Or the L-39 Delfin?
Motorlet_M701_turbojet.jpg



But that video I posted is of a RR Derwent engine (Mk.V or later, scaled down Nene, not the original)
 

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