Many movies and songs use a lot of of bass to make it feel more real to the viewer or listener. Because of this, subwoofers are common in high-quality audio setups, often costing a substantial part of the budget. [Daniel Fajkis] takes the subwoofer to it’s logical extreme by building a rotary subwoofer on a $200 budget.
The principle of a rotary subwoofer is that a normal subwoofer physically moves the air, and so does a fan. If you could make a fan oscillate the air instead of only pushing it, you could turn it into such a subwoofer, which is exactly what [Daniel] did. [Daniel] mounts a large electric motor on the case of an ex-subwoofer to spin the fan. Then, he uses the rotor linkage of a model helicopter and a modified subwoofer speaker to pitch the fan blades, spinning around to create a truly impressive gust of air oscillating at as low as 1 Hz.
The video, after the break, is well made with some good humor, including the legendary quote: “It’s gonna tear apart my household, there’s no way we’re surviving this one.”
If that isn’t enough force from a subwoofer for you, maybe this subwoofer vortex cannon is.
That is an impressive sub-woofer!
That is Really cool!!!
I love these dang things—one of the most hilariously absurd machines ever conceived in the neverending quest for bass that will melt your face. One would definitely want to put a baffle on it, and probably move it down into the basement and turn the basement into a huge tuned resonator.
http://www.rotarywoofer.com/
Yes, but can you put it in a car’s trunk…..
Yes, cut out the hole where the spare tire is and install using the vehicle floor as the infinie baffle. The vehicle body IS now the subwoofer enclosure.
I am glad someone mentioned a Leslie speaker joke here. There’s hope for this worldz
I used a Leslie with a guitar amp in my Band back in the day…
It has to have an infinite baffle . To put another way: a MINIMUM of 500 cubic ft of air space. Behind it.
You cannot put a baffle on it.
This dude rules
Holy crap, that’s awesome. Love it.
Reminds me of the Myth busters episode when they built a giant woofer for a car. Blew the sunroof out.
Finished a rough copy, but the fan motor I have is junk and I accidentally bought a 450 rotor head, but should have bought a series 550 or 600, anybody have some parts?
Awesome.
I had a buddy back in the day that got tired of his vehicle-installed sub rotting from the wild vehicular environment of heat and humidity and made one from a solenoid and stainless colander. It worked surprisingly well! I believe the driver was DC-out and there was a 555(or the dual 556) involved with some hefty caps from an old Lambda PS.
Very impressive work.
What am I missing? Is this for music or just opening doors? It would have been nice to actually hear/see some *music* played through it
At a minimum he should have demonstrated it at 25 Hz, then 20 Hz, then 15 Hz, then 10 Hz.
Because demonstrating 10 Hz via cellphone camera microphone -> YouTube encoding -> viewer’s audio system is expecting way more than the signal chain can handle.
Not quite as artistic of a video, but this is definitely a better demonstration of the capabilities of one of these:
https://youtu.be/FvzHyYzXEdw
Same guy also has a detailed build video on how to make your own
Totally agree. 1 hz – 10 hz is not really a sound, more of a respiration. All the doors in the house moving back and forth once a second is not going to improve your music listening experience, IMHO…
Its a sound, homo sapiens is just not equipped to hear it. All the elephants in the neighbourhood can pick it up just fine.
Definitely agree with you I was waiting to hear music as well. Little disappointing to not hear any music, at this point seems he just built a fan for the living room.
You damn kids.
https://hackaday.com/2006/09/27/rotary-subwoofer/
https://hackaday.com/2016/03/30/rotary-subwoofer-combines-a-speaker-coil-w-a-fan/
That’s it everyone! Someone did something before, we need to shut the entire Internet down!
This is a place for NEW IDEAS ONLY!
THAT’S WHY THE WEBSITE CLEARLY READS “BRANDNEWHACKS.COM”
Guess I needed an explicit /s
Here’s a how-to someone put up. He’s even linked STL files. Let’s Go build one, people!!
https://youtu.be/dpwPDGCEb80?si=ZXBZxYI7pzbJFSb3
Could this be done with two brushless motors and ESC’s?
Great creation!! I just found this in reddit this morning
Music for the deaf from a famous DJ
Including speakers backpacks and other awesome inventions
https://reddit.com/r/WTF/s/QvZScMweM5
I wish he fired out some Tracks to listen to.
Rotary subwoofers have been around for some time: https://www.soundandvision.com/content/eminent-technology-trw-17-rotary-subwoofer
Leslie speakers for Hammond organs… Old School
I want to hear the 1812 overture played back with that thing!
A 5 bladed rotor head, swashplate and all!
Would a flybar stabilize it?
Naw, but why not one that flies?!
💡!
Modulate an existing helicopter design, retaining the collective and cyclic control for flight…
Then scale it up to size needed.
Need to scare the Americans for spooking your Vietcong with that Huey that had all the speakers mounted on it?
An Mi-8 transport helicopter rigged for this would scare them crapless.
h̥͇͕̻o͖̯͓͓̊̆ͫ̿̓ͦl̴̦̲̈́ͩÿ̮̬̞̭́͑̀ͨ͘s͔͓̥̮̭̈ͣ̔̂ͣ̽̊͠ͅh̖̬̹̭̭ͪ͊̀ͅi͎̯̖̦̘͇̫ͬ̃̄ͬt̵̖͔ͬ̇
My next 700 size chopper will incorporate this idea. Patent pending as of this posting.
Not sure… the effect on a helicopter might just be to shake the heli to bits.
Very good point. Extra safety wire would be mandatory for flight safety reasons.
Also the gaps between inspection intervals for critical components would need to be shortened considerably.
Does it need to be placed in the window. If I built this into a normal sub woofer box and then put a few large duct pipes from the sub out the window.. not sealed.. would it still work the same?
Did I miss the part where he specified the helicopter part he used to make this thing?
A swashplate assembly from any large RC helicopter, of appropriate specs. (Blade count).
The $200 would just about be cashed with this purchase alone. Not counting even the pushrods or bellcranks.
Unless you just happened to have a retired five bladed RC helicopter laying around… Then the cost estimate would fit more inline.
Who wants to listen to 10 hz!?? I thought it would be used for music….like a Bass Guitar Amp or bass drums, etc….dont “buzz” the house, ROCK IT!!
If you check out the YouTube video in my earlier comment (https://youtu.be/FvzHyYzXEdw), the guy demonstrates his with several music tracks in the latter half of the video – the house is definitely rocking.
His build video (https://youtu.be/dpwPDGCEb80) also demonstrates the house-shaking power at the beginning, and has pretty detailed instructions and links to STL files to build your own.
I don’t know how old this is or really any other information except what and that some1 is interested understands how this is not a toy and deserves a no corners cut approach I would gladly support an honest effort in any way I can help with I personally think the applications are far more than just music or sounds anyway please if u would like to explore this further let me know i don’t have much at all really but I really do believe in this platform plus a couple tesla things like his turban or his valve its beautiful thank u I’m Brian