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 Post subject: Blue Angels noise ratio
PostPosted: Sat Oct 06, 2018 9:12 pm 
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So SF got the Blue Angels today, and yep, it's always fun.
But 4 went over the abode pretty low (500'; guess. Not rivet-counting close, but see the pilot if they were upside-down close). NOISY!
But it got me to wondering: How much is the jet exhaust and how much is a result of the air being violently shoved aside and then slapping back together (as in thunder)?
Anybody got a clue?

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PostPosted: Sat Oct 06, 2018 11:21 pm 
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Location: Radondo So Cal
I lived in Brawley near El Centro (10 miles from Mexico) in the middle of Calif.
They train down there and they were always buzzing around,

Heard about a retired Bee Keeper in Brawley with a 356. Tracked the guy down and saw a dusty Pre A all complete and nice.
He didn't want to sell it in 1999. Last year I did some extensive searching calling people and found they guy again.
Said he sold the car couple years ago to his Doctor. Oh well.


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PostPosted: Sun Oct 07, 2018 2:04 pm 
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Ron LaDow wrote:
So SF got the Blue Angels today, and yep, it's always fun.
But 4 went over the abode pretty low (500'; guess. Not rivet-counting close, but see the pilot if they were upside-down close). NOISY!
But it got me to wondering: How much is the jet exhaust and how much is a result of the air being violently shoved aside and then slapping back together (as in thunder)?
Anybody got a clue?


The ratio is probably a variable that changes with aircraft type, engine size and type and the speed.

Obvious example: Sub-sonic would be mostly exhaust sound. Supersonic would add the thunderclap of the shockwave. Afterburner would also increase the exhaust sound. Maybe a good question for AgentJayZ.......

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PostPosted: Sun Oct 07, 2018 2:07 pm 
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An aside: Another guy and I were loading a small blast at an iron mine near Lovelock, Nevada. We were in the bottom of the pit which resembled a miniature Grand Canyon. Two jets from NAS Fallon flew over low and supersonic. We thought we were dead.......

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PostPosted: Sun Oct 07, 2018 7:59 pm 
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Years ago, when they flew F-4 Phantoms, those suckers were LOUD. I grew up living under one of the landing flight lines for the old El Toro air base and it was near ear splitting. But cool for a 12 YO kid...


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PostPosted: Mon Oct 08, 2018 7:49 am 
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I don't know the effect they have on the air but living in the flight pattern of the F-15 school house runway for pilots the sound is a sweet sound of freedom. also always enjoyed the sound of the F-4 and F-16 when they were the training planes for the school house.

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PostPosted: Mon Oct 08, 2018 7:45 pm 
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Wes Bender wrote:
The ratio is probably a variable that changes with aircraft type, engine size and type and the speed.
Obvious example: Sub-sonic would be mostly exhaust sound. Supersonic would add the thunderclap of the shockwave. Afterburner would also increase the exhaust sound. Maybe a good question for AgentJayZ.......

They're flying F-18s, but I have no idea how that relates to other choices.
We were on a boat several years ago; same planes. One did a very low pass (got rooster tails) and misjudged his speed just a bit: BOOOM!!
So, yep, when they go trans-sonic, it ups the noise level a LOT.
And, Jon? It's still cool to a 72YO kid going on 15...

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PostPosted: Mon Oct 08, 2018 10:24 pm 
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Well Ron, you know the old adage regarding F-4's. Given enough thrust, a brick can fly... :P


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PostPosted: Tue Oct 09, 2018 8:35 am 
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back in 1965 when in VN we nick named the f-4 the Rino, big old war horse.

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PostPosted: Mon Nov 19, 2018 1:11 am 
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F-22's put out about 133 DB at full throttle on the flight line - that is very, very loud.
On the delivery flight after they were DD-250'd the pilot would stand the jet on its tail once it cleared the runway and go straight up to past 40,000 feet - they said they had to be careful not to go supersonic during the vertical climb.

C-5A's and C5-B's were loud but the F-22 was even louder. Its a 42,000 pound airplane with over 70,000 pounds of thrust.


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