"Please adjust volume so that my talking sounds normal" Lucky I had my cursor hovering over that mute button, just in case. That would have blown my ears off.
Wanna make it louder? Make or buy a blower, even a shop vac and force it into the intake making positive pressure, aka "supercharging the siren" this is the method of the Federal Signal Thunderbolt and ACA Hurricane
Or attach it with a air funnel to the big-ass bumper on my truck. Let's see how loud it is at 60 MPH!!!! Now SUBSCRIBE ALREADY PEOPLE - Has this man not done enough cool videos YET to earn your subscription? What are you waiting for, a scroll sawed, personalized invite?
Bradley Brand That wouldn't generate near the same sound pressure. Blowers such as those generate over 250 CFM of airflow at over 9-10PSI. Uncompressed free air wouldn't work that way with your truck.
+Max Glick Oh no don't dare try it with head phones. It's frightening as it is on Bose Comanion 5 speakers now with a head set? Unless people want to scair themselves mindless.
I'm sure his neighbors just love him to pieces... I love the homemade air raid siren, but I won't try to repeat his efforts, as I live in the city, and don't like meeting the police that much...
In order to make it louder, you need to match the acoustic impedance of air. You can do this by adding horns that convert the low impedance output of the siren to the high impedance of the air. Once matched, the power transfer to the air will be far more efficient and that 1.2kW will be absolutely deafening!
G3RMANARMY 1200W is equivalent to the sound of a medium DJ system, but those have to produce a lot of bass frequencies. If it were putting all of that energy into two sounds which contain most of their energy in the middle of the audio spectrum for human hearing where it is most sensitive, then it would sound orders of magnitude louder!
or, ... Place a Microphone beside the siren, now, Conect to amplifier, then to another amplifier, then to another, then another, all set to -0DB (from -DBs) then another amplifier, now connect atleast 2 1200Watt speakers, This will burst the ground of loudness >_
ok .. so i have this pretty sweet sound system .. i normally have the volume on 12 .. when you asked to adjust it , i put it on 76 , sounded like normal .. then WTF OMG JEEEEEZUS !!!!!!!! i think i woke up the neighbours !!!!!
It's funny how he was like "turn up your volume so I can hear my voice," and I was like "nah," and then turned down the volume instead. About as loud as expected
No idea why this guy set a trap at the end of the video, but don't turn your speakers up when he tells you to.. Turn them down until you can barely hear him talk.
He tells you to turn it up so you can hear him talk, then turn it down before he switches the alarm on. I don't see how it's a trap if he's in a small space with a loud machine and puts on ear safety equipment, saying "Okay, here we go."
Him putting up ear protection was somewhat of a give-away that it might not be very clever to turn up your volume to listen to this. After all, an air raid siren was designed to be bloody loud. You were supposed to hear it from quite the distance away, because you know, air raid and all that.
An "alarm" is sounded by raising and lowering the pitch (a sound we have all heard on many WWII movies). The "all clear" was given by keeping the same pitch.
The audio is omni-directional coming out. If you put some kind of horn to help make it uni-directional you'll get a lot louder of a sound. Thats why air raids have horns, to direct all of the sound in one direction at the same time helping amplify it.
So impressed with your skills in many arenas. A man after my own heart. I can see you've built almost everything custom in your shop, too. I used to build pipe organs, was the cabinet maker, so have a deep appreciation for what you do. Thanks for sharing everything you share.
It is a much less offensive note, thats for sure, although, sirens are meant to be offensive to the ears, so I suppose that should be expected. Man, that note is so close tho... I bet a 7/10 would give you that fear of god feeling a siren is suppose to give you :P
Watched this video when it first was posted, even with the volume way down the noise woke my dad up from a sound sleep...three rooms away! Sound is really amazing thing to study...{both sound & light}
You may be able to amplify it by turning it into a compression driver. Enclose it with a forward facing aperture - located in the center in line with the motor shaft is fine - and then make a simple box horn to act as a megaphone. You're only interested in volume, not fidelity, so no need to muck about with flaring or anything fancy for a first pass. A compression driver has a smaller opening that the actual driver (hence the compression) so the aperture having less area than the total area of the open slots at any time ought to provide the desired results. Really loved the videos on this, many thanks, very inspiring!
I grew up in central Oklahoma. That was the sound we got every Friday at noon during tornado season. And during actual tornadoes, but those were a lot less common.
Awesome! As I recall, the real ones had a horn assembly that was driven to rotate slowly to scan the horizon to increase the sound level to make distant listeners notice the sound. Keep up the great work! Arlen
just "no"? can you please explain to me how yours is different, in essence, from these horns? www.directindustry.com/prod/klaxon-signals/high-power-sirens-15275-954623.html now, don't get me wrong. the fact you built this by hand and with wood is very impressive indeed. i'm not trying to take away from that. just wanna know the difference between yours and a klaxon.
***** The siren your link leads to is a Klaxon brand Siren. Confusing, possibly, but both are sirens, and not klaxons. A klaxon uses an electromagnetically oscillating plate to create its sound, I believe
Jim H ***** Original Klaxon-brand sirens used a steel diaphragm struck by the teeth of a spinning cog. They also used horns for better impedance matching. They are known for producing that "ah-oog-ah" sound you hear in old submarine films.
I see that evil little smirk. uh-huh. It's like what if Rick Moranis was an inventive crafty geek with an evil prank streak SO busy fighting off all those delicious prank thoughts. I get it. Your sense of humor is the BEST! And the siren is awesome!
i have that air raid siren its on a switch and just to make it not so loud, the air raid siren itself has a switch to change the rpm. I have it on 750 rpm so its loud enough (about 100 dB from 5 meters away from it) So i use the siren to tell my FAMILY WHEN ITS LUNCH TIME OR SOMETHING OTHER BECAUSE THEY ARE ADOUND THE HOUSE EVERYWHERE. Oops sorry for the caps.
If you were to cut a "Doughnut" shape from a a piece of 3/8" thick steel and attach it to the face of your impeller, the siren would wind up and down more slowly when energized and de-energized making for a more even sound. Great video!!
The simplest way to make it louder would be an amplifier cone, or something similar. Beyond that, scaling it up might be the next simplest. MIGHT. Either way, amazing proof of concept. And useful, somehow. Probably. Maybe.
If you want to make it louder, just build a cone like shape for where the sound comes out. It's all about the cone shape as well. You know the hand held speaker the camp councilors always used at camp to talk to everyone outside? That's what you want to use to make it louder.
Using wood dampens the notes significantly - there’s a distinct difference in the sound from a stock alloy stator and metal casing but still a great project and good results
I needed to put a little fence around my house so the alarm does not scare anyone nearby and also It spins! meaning the siren as it sounds, spins around and around and around and around and around.
You have the right concept in the design, but can you get the rotor closer to the chopper radius (the dual tone rings on the outside of the unit?) If so, you will be able to maximize the output of the siren. The tones are very good and have a good harmony. Last thing I would do would be to use a 3/4-1 HP step up 220V electric motor for the driver. I notice that when it winds down it is bogging a little bit. Imagine building a siren exactly like this design only have it be 2.25 times larger. You would be able to hear that close to a mile away. The key elements are:1) Closeness of rotor fit to the chopper radius internally;2) Use a 220/240V Electric step-up motor. (Sounds like you are using a 110-115V STD. Motor now. 3) Be sure that you use good roller bearings for proper support and levelness. Beings you are using wood, you need not worry about weight problems and that will help the motor that you use to kick it up faster. Some of that bogging you had there I think might be from those bearings as they may have heavy duty bearing grease in them and looks like it was cold outside then. That would tend to thicken those bearings grease and by not having a strong enough motor, you may get that bogging. Good job and good luck!
Good idea but megaphones have a max volume they can reach, they don't just flatly increase any sound otherwise you could use them to make an obscenely loud sound by linking a bunch together. this siren is probably louder than any megaphone
You could use an acoustic megaphone. A lot of the professional ones actually "horn load" the output of the slots e.g. put an expanding trumpet/funnel of air on the end of the slots in order to compress and move more air! And those are REALLY LOUD!
"turn volume so that my voice sounds normal..." TRYNA GET PEOPLE KILLED SIR!!!
+urgandma lmao
lol
Laughed my ass off yeah mans wild
*yes*
my ears hurt now
"Turn up your audio" Ha ha nope
Mark Murarescu wut?
Der Kaiser I recognize your name from somewhere.
"Well... it's not.. deathing loud...."
Ow My ear holes
Der Kaiser I'm really glad I didn't as right now I'm recovering from an ear operation!
"Please adjust volume so that my talking sounds normal"
Lucky I had my cursor hovering over that mute button, just in case. That would have blown my ears off.
+Kipah i did as well lol i knew it would happen
+Kipah I had my volume on my headphones ready XD still got caught
+Kipah same here, i felt a tingling in my guts saying "aww maybe set volume at half of that, and keep mouse ready on mute, bro"
Mine already are if it isn't bombs it's the sirens
@@thetoastedwaffle5763 Where the hell do you live? Syria? Israel? Palestine? An American school?
Hopefully no one gets "alarmed" by it
Hacked by R.H.H Buh dumsss
Hacked by R.H.H bah dum tss
how would they get alarmed? it's a siren lol
I adjusted my volume then skip ahead 10 seconds with earbuds
Hacked by R.H.H you can see yourself out not the door is around the corner
Wanna make it louder? Make or buy a blower, even a shop vac and force it into the intake making positive pressure, aka "supercharging the siren" this is the method of the Federal Signal Thunderbolt and ACA Hurricane
Or attach it with a air funnel to the big-ass bumper on my truck. Let's see how loud it is at 60 MPH!!!!
Now SUBSCRIBE ALREADY PEOPLE - Has this man not done enough cool videos YET to earn your subscription? What are you waiting for, a scroll sawed, personalized invite?
Bradley Brand That wouldn't generate near the same sound pressure. Blowers such as those generate over 250 CFM of airflow at over 9-10PSI. Uncompressed free air wouldn't work that way with your truck.
You haven't even seen my funnel! JK.
I think mounting a horn on it would help Too, so the sound would balance a bit.
If you lived on a farm you could use it to let your family know its dinner time...or that your in-laws just arrived or something. XD
so that they can run as fast as they can to the kitchen or the storm shelter, respectively.
Wait, I think I saw you on a simple history video about weird weapons of WWI.
They use them in plants to signal shift change/ lunch and when there is an emergency
I can't like because it's at 420 likes lmao
Shaw is yyyyyyÿ
If this guy was any more Canadian he'd be frozen in a hockey rink filled with maple syrup
he's actually German by blood
phgoil then he should of made a Jericho trumpet
jackson talbot Nice one
petro he’s from Wisconsin
@@phgoil Nothing wrong with that! Im German by decent....
Rip headphone users, like SERIOUSLY rip headphone users
Max Glick Nice original comment kid.
Max Glick It was not even that loud.
Max Glick my ears actually vibrated... HOLY SHIT.
+Max Glick Oh no don't dare try it with head phones. It's frightening as it is on Bose Comanion 5 speakers now with a head set? Unless people want to scair themselves mindless.
Hamit Campos yeah I know I had my volume on low on my headset and took it off. it played through the headset and it was WAY too loud!
I'm sure his neighbors just love him to pieces...
I love the homemade air raid siren, but I won't try to repeat his efforts, as I live in the city, and don't like meeting the police that much...
put i do like meeting with the police and i dont give a shit about my neighbors or city
69th like
@@maaz7228 xd
Same xd
You son of a bitch!!!
Headphone wearers DO NOT ADJUST YOUR VOLUME!!!!!
I still REALLY want one of these though! :-D
Make about 50 of these and set them up around a city :D
Deep face u
its not WW2
hahaha!!!
Re But these things still exist ... And the Second World War will be not the last wort war ...
Everyone will be all like "OH SHIT ISIS IS ATTACKING!!!"
put it on church and get ready for silent hill
I'm commenting before I hear the siren... I have headphones
Noisy hill
flamingpanda r.i.p
Vanguard Detonados that’s funny there is a Sentry 10V2T Siren my favorite siren that I have one too but anyway ITS RIGHT BY MY CHURCH ⛪
That would need to be an stl 10 or km Europe
In order to make it louder, you need to match the acoustic impedance of air. You can do this by adding horns that convert the low impedance output of the siren to the high impedance of the air. Once matched, the power transfer to the air will be far more efficient and that 1.2kW will be absolutely deafening!
Good explanation! He should really do that.
Thenormalsteve just imagine. if a 100 watt speaker gets you house shaking, what would a 1200 watt "speaker" do if it was as ifficent.
G3RMANARMY
1200W is equivalent to the sound of a medium DJ system, but those have to produce a lot of bass frequencies. If it were putting all of that energy into two sounds which contain most of their energy in the middle of the audio spectrum for human hearing where it is most sensitive, then it would sound orders of magnitude louder!
***** that what i meant basically!
or, ... Place a Microphone beside the siren, now, Conect to amplifier, then to another amplifier, then to another, then another, all set to -0DB (from -DBs) then another amplifier, now connect atleast 2 1200Watt speakers,
This will burst the ground of loudness >_
....... MY EARZ I THOUGHG IT WOULDNT BE SO LOUD BUT NOW IM SHAKING AND MY EARS HURT but good project
Tommy Le LMAO SAMEEE
It's an _air raid siren_, what did any of you expect?
Tommy Le same... luckily my headphones have a really fast lolume control i just spun it all the way down after like half a second...
***** At least you don't have hell in you anymore
Same here.
Beautiful woodworking! Most Canadian dual-tone sirens had ten and twelve ports like WWII British sirens, but sounded at a higher pitch.
ok .. so i have this pretty sweet sound system .. i normally have the volume on 12 .. when you asked to adjust it , i put it on 76 , sounded like normal .. then WTF OMG JEEEEEZUS !!!!!!!! i think i woke up the neighbours !!!!!
i woke up my neighbours for sure and i'm on headphones
angelo yepp... heard your headphones, and Im from Sweden.
***** I don't believe either of you, and I'm a believer.
"I build noisemakers just because they are cool" - you're a five-year-old with a workshop and that's amazing!
Jethro Q. Walrustitty why so mean
He's not being mean, he's telling the guy that he is really fun.
@@dominicsmith1771 Having childlikeness in your later years can be a good thing. it's not necessarily mean.
It's funny how he was like "turn up your volume so I can hear my voice," and I was like "nah," and then turned down the volume instead. About as loud as expected
same :D i didn't want a realistic experience as the person standing next to it had just put hearing protection on :D
I speakers exploded
I'm lucky my ears didn't explode and bleed!
I was wearing headphones :(
yea same
I was wearing earbuds at full volume so his voice sounded normal I wasn't think and now I can't hear
Reapersurvival Gaming rip
No idea why this guy set a trap at the end of the video, but don't turn your speakers up when he tells you to.. Turn them down until you can barely hear him talk.
He tells you to turn it up so you can hear him talk, then turn it down before he switches the alarm on. I don't see how it's a trap if he's in a small space with a loud machine and puts on ear safety equipment, saying "Okay, here we go."
He never tells you to turn it down again before he switches it on.
I love your face at 2:40 like, "maybe I shouldn't have done that"
+jrdubois112277 ahah yeah like "omg what have i done..."
+jrdubois112277 IKR. That's a my-wife/girlfriend-is-going-to-yell-at-me kind of look.
2:07 Guys - DO NOT TURN UP THE VOLUME, your ears will get ripped at 2:30
This "advice" was a stupid and dangerous trap.
found the idiot
yes rip. your ears
you didnt think about it hahah :D
Him putting up ear protection was somewhat of a give-away that it might not be very clever to turn up your volume to listen to this. After all, an air raid siren was designed to be bloody loud. You were supposed to hear it from quite the distance away, because you know, air raid and all that.
Yup!
My lawyer needs your contact information for the lawsuit due to hearing loss from following your instructions on this video lol
An "alarm" is sounded by raising and lowering the pitch (a sound we have all heard on many WWII movies). The "all clear" was given by keeping the same pitch.
As someone who lives next to a dockyard where a ton of these go off 3 times a day. It's pretty much the same as the real thing ...nice one man! =)
i felt how my eardrums exploded when i turned up the volume
The audio is omni-directional coming out. If you put some kind of horn to help make it uni-directional you'll get a lot louder of a sound. Thats why air raids have horns, to direct all of the sound in one direction at the same time helping amplify it.
GOOD GOD MAN WOKE THE ENTIRE HOUSE UP THROUGH MY HEADPHONES THUMBS UP FROM ME
So impressed with your skills in many arenas. A man after my own heart. I can see you've built almost everything custom in your shop, too. I used to build pipe organs, was the cabinet maker, so have a deep appreciation for what you do. Thanks for sharing everything you share.
Saw both the making and testing of the siren videos. They made me smile.
That port ratio
It is a much less offensive note, thats for sure, although, sirens are meant to be offensive to the ears, so I suppose that should be expected. Man, that note is so close tho... I bet a 7/10 would give you that fear of god feeling a siren is suppose to give you :P
7/10 port sirens exist, and they are terrifying sounding. HOR made one.
Marcus Toroian well 10 is 3 away from 7, so it would be a devil's interval. It should inherently sound pretty dark :P
Marcus Toroian It's a minor sixth. A second inversion (6-4-1) major chord.Very pleasing sound.
Watched this video when it first was posted, even with the volume way down the noise woke my dad up from a sound sleep...three rooms away! Sound is really amazing thing to study...{both sound & light}
Nobody:
Everyone:
Me: Siren head.
bruh.
Head phone users have never been matched with such a fierce opponent.
ever heard of a switch?
phatrides222000
He did, but he didn't have any spare switches laying around
You may be able to amplify it by turning it into a compression driver. Enclose it with a forward facing aperture - located in the center in line with the motor shaft is fine - and then make a simple box horn to act as a megaphone. You're only interested in volume, not fidelity, so no need to muck about with flaring or anything fancy for a first pass. A compression driver has a smaller opening that the actual driver (hence the compression) so the aperture having less area than the total area of the open slots at any time ought to provide the desired results. Really loved the videos on this, many thanks, very inspiring!
Because its made of wood, the sound is not as crisp! If it was made of metal and was a bit bigger you would hear it really really really far away!
Your enthusiasm and craftsmanship are impressive.
If you somehow wired it to a dimmer switch, you could easily make the air raid sound rise and lower like the normal ones.
I cant get away from ponies on the internet... -_-
No, no you can't. Sorry. :/
Giving in is the only choice for people these days...
Not really, its a great show. Or at least it is to me.
Giving in....
2:30 RIP headphone users
IS IT ME OR DOES THIS GUY REMIND ANYONE OF THE GUY FROM GHOST BUSTERS?
Joey R he reminds me of the Michael Bolton in Office Space LOL
Lol
Haha yeah you mean the nerdy guy in ghost busters, he was also in revenge of the nerds.
+Julian Veritas I think you're confusing Rick Moranis with Robert Carradine.
I like how my volume didn't go nearly high enough to make him sound normal.
Not RIP my speakers.
I actually legitimately thought my house was gonna explode
No one:
People around: GET IN THE BUNKER GET IN THE BUNKER
I would get arrested if I built one of these...
Zen Kitteh yes because you are scearing thousands of people
Holy shit. This man blew my eardrums out.
R.I.P. Headphone Users!
+GothicSocietyClan And their fathers, and their fathers' fathers.
i die laughing everytime i come back and watch this
1:16 10/10 pun approved. You are now the world pun champion.
I was like "oh come on, we have much louder from ww2 in Europe that are still in use", then the "turn up the volume" part came
i had to crank the volume all the way up to hear him. and than the siren comes on....
WHY
I grew up in central Oklahoma. That was the sound we got every Friday at noon during tornado season. And during actual tornadoes, but those were a lot less common.
R.I.P headphone users
You should make another one of these, except instead of 6 and 10 ports, add 10 and 12 ports. Has a really good sound.
Put a microphone near it, a HUGE speaker, put it on 11...
Awesome!
As I recall, the real ones had a horn assembly that was driven to rotate slowly to scan the horizon to increase the sound level to make distant listeners notice the sound.
Keep up the great work!
Arlen
isn't that type of siren called a klaxon?
***** no
just "no"? can you please explain to me how yours is different, in essence, from these horns?
www.directindustry.com/prod/klaxon-signals/high-power-sirens-15275-954623.html
now, don't get me wrong. the fact you built this by hand and with wood is very impressive indeed. i'm not trying to take away from that. just wanna know the difference between yours and a klaxon.
***** The siren your link leads to is a Klaxon brand Siren. Confusing, possibly, but both are sirens, and not klaxons. A klaxon uses an electromagnetically oscillating plate to create its sound, I believe
Jim H ***** Original Klaxon-brand sirens used a steel diaphragm struck by the teeth of a spinning cog. They also used horns for better impedance matching. They are known for producing that "ah-oog-ah" sound you hear in old submarine films.
Nelumbo Nucifera thx.
I would totally love to hang out with this guy, sit back and have a few beers.
I'm bleeding from my ears now, is that supposed to happen?
The last part made me throw my earbuds after turning it up like you told me to
would be louder with a horn on it obviously
I see that evil little smirk. uh-huh. It's like what if Rick Moranis was an inventive crafty geek with an evil prank streak SO busy fighting off all those delicious prank thoughts. I get it. Your sense of humor is the BEST! And the siren is awesome!
BRO YOU TOLD US TO TURN UP THE VOLUME THEN BLAST THE AIR RAID SIREN
Amazing!!! Grandpa just ran to the garden thinking that Tojos started to attack us again
Holy shit i thought my headphones were gonna blow
@ 1:17 "Hopefully nobody's going to get alarmed by it." LOL
RIP headphone users (me included) x.x
Since I was a child this sound always scare the shit out of me.
Scare the entire neighborhood much
i have that air raid siren its on a switch and just to make it not so loud, the air raid siren itself has a switch to change the rpm. I have it on 750 rpm so its loud enough (about 100 dB from 5 meters away from it) So i use the siren to tell my FAMILY WHEN ITS LUNCH TIME OR SOMETHING OTHER BECAUSE THEY ARE ADOUND THE HOUSE EVERYWHERE. Oops sorry for the caps.
@ 2:32 Wife's cat "oh shitted" outta here faster than Mercury the god.
Coulda juss said hermes
Nice build. Just found your channel and I can tell I am going to be spending more time in the wood shop.
dB rating?
998889999999999
Deafening
If you were to cut a "Doughnut" shape from a a piece of 3/8" thick steel and attach it to the face of your impeller, the siren would wind up and down more slowly when energized and de-energized making for a more even sound. Great video!!
lets all have a momment of silence for everyone who turned up there volume and salute those who were brave to wear headphones...rip ears
"Turn up your volume" **casually puts on ear protectors**
The simplest way to make it louder would be an amplifier cone, or something similar. Beyond that, scaling it up might be the next simplest. MIGHT.
Either way, amazing proof of concept. And useful, somehow. Probably. Maybe.
Hey do YOU know that he is not stupid?
He looks so proud of it. Sweet
No dB test?
I wondered how many dB SPL as well. Maybe he doesn't own an SPL meter
If you want to make it louder, just build a cone like shape for where the sound comes out. It's all about the cone shape as well. You know the hand held speaker the camp councilors always used at camp to talk to everyone outside? That's what you want to use to make it louder.
it starts up and slows down too quickly i suggest adding counter balanced weights to it.
Exactly although most dont know what that is.
That would add a nice affect to the wailing. Would the pressure be too much for the wood?
Not much maybe some steel disks. Sheet steel i should say.
I would think a good speed controller on the motor would be a better idea rather than adding unnecessary weight.
Using wood dampens the notes significantly - there’s a distinct difference in the sound from a stock alloy stator and metal casing but still a great project and good results
cool I just blew out my speakers lol
You're handier than a pocket on a T-shirt....Nice job !
I just noticed his name couldn't be more german. Is this common in canada?
A really talented guy!
I turned up my volume to full. I died thanks a lot for my death Matthias
Mad respect to a guy who makes an air raid siren for fun
RIP Headphone users D:
I needed to put a little fence around my house so the alarm does not scare anyone nearby and also It spins! meaning the siren as it sounds, spins around and around and around and around and around.
when you told us to turn up our volume all the way ouch
Hook it up to your workshop fire alarm. I'm sure when your neighbors patience finally breaks you're gonna need it.
'Please adjust the volume, so that my voice sounds normal, and that your ears are ready for rape.' 'HERE WE GO!'
ha,ha,ha,hahaha!!!!!!
Dennis Cane speakin of ear rape,thats cuz every time I try for the mouth, they keep turnin their flippin head!
Lol insane
i turned the volume up, using my earphones... the siren sounds great... i loved it... thanks for sharing...
i used haedphones! rip me
me too my ears died
Same here... My earphone couldn't go harder and I still couldn't hear him talking that loud...
Then he turned the siren on... RIP :(
scared me so much
I used headphones on loud.
Oh, relax. I was always deaf!
TrainedWarrior is this safe
Never realized how grateful I am for sound equalization.
May come in handy when the zombies attack.
You have the right concept in the design, but can you get the rotor closer to the chopper radius (the dual tone rings on the outside of the unit?) If so, you will be able to maximize the output of the siren. The tones are very good and have a good harmony. Last thing I would do would be to use a 3/4-1 HP step up 220V electric motor for the driver. I notice that when it winds down it is bogging a little bit. Imagine building a siren exactly like this design only have it be 2.25 times larger. You would be able to hear that close to a mile away. The key elements are:1) Closeness of rotor fit to the chopper radius internally;2) Use a 220/240V Electric step-up motor. (Sounds like you are using a 110-115V STD. Motor now. 3) Be sure that you use good roller bearings for proper support and levelness. Beings you are using wood, you need not worry about weight problems and that will help the motor that you use to kick it up faster. Some of that bogging you had there I think might be from those bearings as they may have heavy duty bearing grease in them and looks like it was cold outside then. That would tend to thicken those bearings grease and by not having a strong enough motor, you may get that bogging. Good job and good luck!
Add a megaphone to it.
Good idea but megaphones have a max volume they can reach, they don't just flatly increase any sound otherwise you could use them to make an obscenely loud sound by linking a bunch together. this siren is probably louder than any megaphone
so add like 20 megaphones, a'la Bart
You could use an acoustic megaphone. A lot of the professional ones actually "horn load" the output of the slots e.g. put an expanding trumpet/funnel of air on the end of the slots in order to compress and move more air! And those are REALLY LOUD!
That wooden build is perfect for a concert or small gathering for a chaos type effect!!