Registered: Sep 2002
From: The Black Lodge Shangri La Pocono Mountains Pennsylvania USA Posts: 1569+

What you see pictured above is a Chrysler Air Raid Siren, the most powerful siren in the world. It's the size of a car, measuring near 12-feet in length and standing more than 6-feet tall. It also weighs twice as much as today's typical car. This gigantic siren is powered by an 180-HP Chrysler Industrial V-8 HEMI® gasoline engine. The super-duty engine directly drives a three-stage compressor that blows 2,610 cubic feet of air a minute, at nearly 7 PSI, into a giant siren rotor. The compressed air screams through the chopper and out through six giant horns with an exit velocity of 400 miles per hour. The result is an incredibly loud 138 dB sound (measured 100 feet from the siren). The loudness of this siren is unmatched by any other warning device ever sold, ever. It's also considerably louder than the largest steam whistle or horn. As if that were not dramatic enough, the whole unit, engine and all, slowly rotates one and one-half times a minute on its iron turntable base.



Chrysler Air Raid Siren - Specifications

Years of Manufacture:
1952 - 1957
Manufacturer:
Marine and Industrial Division of the Chrysler Engine Division of the Chrysler Corporation of Trenton, Michigan
Power Plant:
Chrysler Industrial 20A 480 Engine
Part Number 1487028
Serial Number 6225
90 degree inclined V-8
4-cycle gasoline converted to propane
331.1 cubic inch displacement
hemispherical cylinder heads
180 HP @ 4000 RPM
312 foot pounds torque @ 2000 RPM
7.5 to 1 compression ratio
Bore 3-13/16 inches / Stroke 3-5/8 inches
Propane carburetor
Stellite faced exhaust valves
Idle speed 650 RPM
Running speed 4600 RPM
Power Train:
13 inch Gyrol fluid coupling
11 inch friction type single plate, dry disc clutch
Compressor:
American Blower
Three stage centrifugal type compressor stiff shaft unit
43 inch OD cast iron housing
22-3/4 inch OD cast aluminum heat treated alloy impellers
Rated speed 4,600 RPM
Discharge volume 2,610 CFM
Discharge pressure 6.95 psig
Projectors:
Six throated cast aluminum
Directional beam exponential type
Length 25-1/2 inches (group)
Height 37-1/2 inches (group)
Width 19 inches (group)
Sound Output:
138 dBC at 100 feet
Single Tone, 460 Hz
[ Coverage Area ]
Size & Weight:
Assembly overall length 135 inches
Assembly overall width 45 inches
Assembly height 62 inches
Assembly height with exhaust 71 inches
Total weight 5,543 pounds
Price:
$5,500.00 (1952)


At maximum RPM, with short acoustic-coupler (horn-extension) the Bell-Chrysler air-raid siren generates 138 dbC (approximately 134 dbA) at 100 ft. or 30 meters, 0 degrees on axis, in anechoic, full space environment, and an estimated 30,000 watts of overall acoustic power. The three Kockums steam horns mentioned above would generate around 132 dbC (approximately 126 dbA) at 100 ft., 0 degrees on axis, in anechoic, full-space and about 50,000 watts of overall acoustic power.





How loud is 138 dB? Very, Very, VERY LOUD!
138 dB C-weighted is approximately equal to 30,000 Watts of sound power.

The Chrysler Air Raid Siren is the loudest sound signaling device ever built. The threshold of pain is 130 dB, anything above that level causes immediate ear damage. The Chrysler Air Raid Siren produces that level of sound nearly 200 feet in front of the projectors. The Chrysler Air Raid Siren is approximately fourteen times louder than a jackhammer!

To give some perspective, the sound level on the deck of an aircraft carrier 50 feet from a military jet aircraft taking-off using an afterburner has been measured at 130 dB. The Chrysler Air Raid Siren measures 138 dB at 100 feet (nearly twice the sound level at twice the distance).

Most popular air raid and warning sirens today produce a sound level of 127 dB at 100 feet and provide a typical one-mile radius coverage area. At 138 dB the Chrysler Air Raid Siren is approximately two times as loud and will provide a two and one-half mile radius coverage area with the same sound level at the distant edge. The most powerful siren available for purchase today (American Signal's Tempest™ T-135-AC™) produces a sound level of 135 dB at 100 feet. The 3dB higher output of the Chrysler Air Raid Siren, at 138 dB, represents twice as much sound energy output.

Siren coverage is based on a 10 dB loss factor. That's to say, for every doubling of distance from the siren the sound level will be reduced 10 dB.



This is a recording of BigRed™ on May 25, 2003, the third time it was started and run in Texas. This time it we were testing the clutch and the engine was started and idled with the compressor clutch disengaged.
Sound Clip #6 - Start & Idle - No Siren .WAV file - 45 seconds (986KB)
START



This is a long recording of BigRed™ on May 25, 2003, during its entire fourth run in Texas. Again the engine is started with the clutch disengaged, idled, clutch engaged, and run up to about 3000 RPM, a hesitation while checking performance, then 4600 RPM - full throttle! (Note: The clutch works great, in the future the engine will be usually started and stopped with the clutch in either engaged or disengaged position.)
Sound Clip #8 - Full Run .WAV file - 59 seconds (1.25MB)
START




This is a recording of Harry Barry's Detroit siren as heard five miles away. Although the siren was pointed in Harry's direction, it was not visible over a ridge between the two distant points. The siren was mounted on a trailer and not at optimum height for sound coverage. At this distance it takes the siren sound about twenty-four seconds (same length of time as this clip) to travel from the siren to the listener. The siren volume was estimated to be 55 to 58 dB at this distance!
Sound Clip #10 - Warning Signal .WAV file - 24 sec.(256KB)
START



Thankx victorysiren.com

http://www.victorysiren.com

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Registered: Jun 2000
From: the MANCANNON!

Holy Sounds From Hell!
That's one big mutha fukka!

What a lame assed Hemi though that only produces 180 bhp. With a little tweaking, I'm sure we can scare the shit out of people 30 miles away

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Registered: Nov 2000
From: a world view that is free of supernaturalism and mysticism

Pah, that's not loud!

http://www.makeitlouder.com/Decibel%20Level%20Chart.txt

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Registered: Jun 2000
From: the MANCANNON!

Ah, my favorite!

quote:

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163-153 (N) N.H.R.A. DRAGSTERS- 5000 TO 7000 HORSEPOWER, LIQUID NITROGLYCERIN FUEL,
EARTHSHAKING AT 50 FEET, HUMANS FIND IT HARD TO SEE, AND BREATHE 140db(P) -REF.1.1987

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Registered: Mar 2005
From: MI, USA

My favorite: 202-198 (P) HUMAN DEATH FROM SOUND

I'm sorry, but that is cool. I didn't even know it was possible, but I've never really sat down and thought about it before. Yet now that I am, it seems like it could happen. But since I'm invincible, I would have to try it out.

With all the cool things you see at only 156...

quote:

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IN A MINI-VAN WITH TWENTY 12” WOOFERS AND 19,000 WATTS OF AMPLIFIER POWER. EACH SPEAKERS IS DISPLACING (PUMPING BACK AND FORTH ) 0.75 INCHES IF LONG HAIR WOMEN SIT IN IT, HER HAIR WILL FLY OUT OF WINDOW WITH BASS WINDSHIELD WIPERS FLY OFF VEHICLE 1/2 TO 2 INCHES, DOOR AND FRONT WINDSHIELD FLEXION MAY BE UP TO +-2 INCHES OR 4 INCHES PEAK TO PEAK

---

...just imagine the cool shit you would see while dying. At least you would go out with a bang!

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Registered: Aug 2003
From:

quote:

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IN A MINI-VAN WITH TWENTY 12” WOOFERS AND 19,000 WATTS OF AMPLIFIER POWER. EACH SPEAKERS IS DISPLACING (PUMPING BACK AND FORTH ) 0.75 INCHES IF LONG HAIR WOMEN SIT IN IT, HER HAIR WILL FLY OUT OF WINDOW WITH BASS WINDSHIELD WIPERS FLY OFF VEHICLE 1/2 TO 2 INCHES, DOOR AND FRONT WINDSHIELD FLEXION MAY BE UP TO +-2 INCHES OR 4 INCHES PEAK TO PEAK

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Registered: Jun 2004
From: Oregon

The tsunami sirens we have on the coast here are only 128db, but they are a lot smaller than that an are electric.

That's pretty loud. I heard a test one time, and I think you'd wake up.

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Last edited by rockouthippie on 03-29-2006 at 05:17 PM

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Registered: Aug 2003
From:

Does your town have long-haired women sitting inside the sirens?

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Registered: Jun 2004
From: Oregon

All the Oregon Coast towns have these signs and the sirens. The arrows almost always point east. Go figure.

Maybe we could have saved a buck and forgot the arrows. I think I had that part figured out. I always thought that was a little funny.... novel concept, during a tsunami, go away from the ocean... hmmmm. Usually, it's really obvious, because most of these towns only have one real road. The governors brother in law must be a sign painter.

I'm inland about 60 miles, so not my town. I like to spend time on the coast though.

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Registered: Mar 2004
From: Marietta, Ga. U.S.A.

We have some odd signs here too... check out the name of the bridge.




In memory of all the dick hunters out there!

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Registered: May 2001
From: 2001:4978:20f::/48

I want to install an air-raid siren on top of my car. Or get an old pickup and put it in the bed.

Why? Emergency carhorn reserved for use on terminal dumbasses.

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Registered: Dec 2000
From: 38 : 10 : 45 N BY -81 : 42 : 40 W Posts: 10^10���

Have fun.

It'll work.

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Registered: Jun 2000
From: the MANCANNON!

Damn, it would suck to be near a nuclear blast because the sound might kill you

quote:

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282 (N)NUCLEAR BOMB, 57 MEGATONS HYDROGEN LARGEST EVER DETONATED, 1961
SHOCK WAVES CIRCLED THE EARTH 3 TIMES, FIRST ORBIT TOOK 36 HR 27 MIN.

---

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Registered: Dec 2000
From: 38 : 10 : 45 N BY -81 : 42 : 40 W Posts: 10^10���

The good ole Tsar Bomba.

[insert clips from Carmina Burana here]

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Registered: Feb 2002
From: Back in Iowa!

quote:

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Originally posted by ScorLibran
I'm not sure how all this can be happening with several long-haired women sitting inside each speaker, even with the help of the bass windshield wipers. How small are these women? And how powerful are these windshield wipers?

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Registered: Dec 2000
From: 38 : 10 : 45 N BY -81 : 42 : 40 W Posts: 10^10���

Part of a page from my 1975 Guinness Book:

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Registered: Jun 2000
From: The West Side

quote:

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320 (N)VOLCANO ERUPTION, TAMBORA INDONESIA, 1815, EJECTED 36 CUBIC MILES. APPROXIMATELY EQUAL TO 14,000 MEGATON NUCLEAR BOMBS, OR A 14 GIGATON BOMB BASED ON EJECTED VOLUME. CHANGE IN MEGATONS TIMES 1.345 EQUALS VOLUME EJECTED CHANGE. IF WAS A NUCLEAR BOMB IT WOULD CREATE A CRATER ABOUT 12.4 MILES WIDE AND 1.33 MILES DEEP. INTERNAL PRESSURE IS BELIEVED TO BE ABOUT 47 MILLION P.S.I. = 347 DB (P) -REF.1.3.

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Registered: Jun 2004
From: Oregon

I was near enough to Mt. St. Helens to see it May 8th, 1980, when it went from the friendly "snowcone" to flipping it's lid . My house is about 150 miles away and we had 1-2 inches of ash. You could see it in the soil for years. Quite a show, blew about 3/4 of the mountain away.

We had to firehose the ash and put panty hose over the air cleaners on the cars for about 2 weeks because the volcanic ash would sandblast the inside of your motor.

Yeah. Big Bang!.

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Registered: Jun 2000
From: The West Side

My mom has a handmade glass egg made from some of the ashes of Mt St Helens. It's really beautiful. Since my grandfather lives in Portland, my parents were in the area at the time it erupted.

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Registered: Dec 2000
From: 38 : 10 : 45 N BY -81 : 42 : 40 W Posts: 10^10���

The Fish Canyon volcano in the US, erupted about 28 million years ago, and erupted about 1200 cubic miles.

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Registered: Nov 2003
From: Pennsylvania, USA

quote:

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Originally posted by SSJ4 Gogitta
Part of a page from my 1975 Guinness Book:

[Image]

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Registered: Jun 2004
From: Oregon

quote:

---

Originally posted by SSJ4 Gogitta
The Fish Canyon volcano in the US, erupted about 28 million years ago, and erupted about 1200 cubic miles.

---

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Registered: Jun 2000
From: the MANCANNON!

Music made for nuclear blasts for sure.

http://www.hedonistica.com/archives...rground_ato.php

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Registered: Mar 2003
From: UK

some cool inteesting stuff here
and El,thats pretty scary stuff they were doing back then

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Registered: Sep 2008
From: usa

I feel that the Chrysler Air Raid Siren was the most powerful and loudest air raid siren still now.The siren can be heard from a distance of four to five miles i.e;(8 km) away and had an output of 138 dB and 30,000 watts, and weighs an estimated three tons.Some of the sirens are still located above buildings and watchtowers.

Synjones

[Spam removal machine activated]

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Registered: Dec 2001
From: Thoron fields and Duranium shadows. Posts: Crap mostly

Spam and Necromancy, well done.

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Registered: Jun 2000
From: the MANCANNON!

So, you add to the topic yet still manage to spam as well?

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Registered: Jun 2003
From: Inside my water bong

Don't tell me the spambots are gaining AI.

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Registered: Dec 2001
From: Thoron fields and Duranium shadows. Posts: Crap mostly

"You poor sick humans, all you ever think about is sex and knock off goods. So many of you are relatives of deposed dictators, corrupt Oil workers or corrupt American military personnel shipping money out of Iraq via a trusted and discreet person you don't know the name of! Sex is all you think of?! We pity you! All we think of is Money!"

Results of a Spambot gaining sentience.

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Registered: Dec 2003
From: 420 Big Buds Way

personally, i'd have to say the biggest atomic bomb ever detonated one is the most impressive, i mean hell, a bomb that made shockwaves go around the earth 3 full times, that's fucking win and god damn half right there, i kind of wonder why there's no entry on how loud it is at the receptor plate of a particle accelerator.

also, i bet david letterman asked NBC if he could set off one of those air raid sirens outside, if i recall, he's gotten, 3 or 4 now at the least as gift's from one of his guests, all of which he demonstrated inside the studio right then and there.

but then again, most of those were the really small type, last i saw was the one sharper image cooked up.

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Registered: Jul 2004
From: Allentown, Pennsylvania

It's not sustained, but the sound from a .22lr pistol discharging is right up there at 160dB from 1 meter away. This is why hearing protection is your friend.

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Registered: Oct 2008
From:

180 hp (130 kW) or 130,000 wats of power from that hemi but only 30,000 wats of sound energy from the siren what a slack job that siren dose

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Registered: Feb 2006
From: Middlanowhere, Iowa

You have to consider how long ago this was built and the state of technology at the time.

We have tornado sirens here in South Dakota that are just as loud but smaller/more efficient, but they are much newer.

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Registered: Jun 2003
From: Inside my water bong

Strange thing is it looks nearly like the machines they use to spit out ground beef at the meat market.

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