CurtPalme.com Home Theater Forum

ecrabb · Posted: Sun Jan 25, 2009 11:38 pm Post subject:

That's a good video to see it in action, but this video totally lays it all out to you can see exactly what they're doing...

http://www.youtube.com/watch?v=3j4HfdImTZo

Sounds like about 900 RPM. That was one of the things I was wondering.

Check it out.

SC

**AnalogRocks** · Posted: Mon Jan 26, 2009 12:12 am Post subject:

Yep I watched that one first. I got the link from that page.

perisoft · Joined: 29 Aug 2007 Posts: 2920 Location: Ithaca, NY

Kind of like my plans for an internal combustion bass drum for use at trance/techno parties...

betel · Posted: Mon Jan 26, 2009 2:50 am Post subject:

Very clever. None of the videos showed it playing an actual audio track though. My guess is it may not be very accurate . Also would need a mechanical low pass filter to get rid of the whir of those blades turning. The principle kind of reminds me of a flying VCR head.

betel · Posted: Mon Jan 26, 2009 2:56 am Post subject:

Did anyone see the episode of MythBusters where they made of subwoofer using a car engine as the prime mover? The took an old car, fabricated a huge diaphram and drove it off the drive shaft with a crank shaft. The up and down oscillation of the crank was connected to the diaphram. I think it worked for about 30 seconds before it self destructed.

jask · Joined: 17 Mar 2006 Posts: 10187 Location: kamloops BC

Mark_A_W · Posted: Tue Jan 27, 2009 10:54 am Post subject:

DrKnow65 · Posted: Wed Jan 28, 2009 1:14 pm Post subject:

Was thinking on this subwoofer yesterday and was woundering how well one could scale down this unit? Imagine a 3" fan woofer in a portable Ipod dock... Brushless RC motor, and get it to hit just a hair higher like 15 to 75hz? a pair of 4" mid woofers and a couple 1" silk dome tweeters Smile

could be pretty sweet.

jask · Joined: 17 Mar 2006 Posts: 10187 Location: kamloops BC

it looks like it need an Infinite Baffle to work well, otherwise it is just a really cool fan.

**AnalogRocks** · Posted: Wed Jan 28, 2009 3:53 pm Post subject:

It's not just a fan. It's a propeller with a pitch control. Now where's that trim button? Very Happy

jask · Joined: 17 Mar 2006 Posts: 10187 Location: kamloops BC

ecrabb · Posted: Thu Jan 29, 2009 4:58 pm Post subject:

Yeah, but then we'd need anti-torque. Damn, it's gets complex fast, doesn't it? Wink

I want somebody to buy one of these and take it apart. I want to see how that pitch control hub is built. I can see how it would be damn expensive, with the small numbers they're building and the mechanical complexity, but come on... 12-grand?!?!? I can't imagine that they have many takers at that price. Seems like they should be able find a way to manufacture them in larger quantities and be able to sell 'em for $3,000 or $4,000 and sell a SHITLOAD more than they do at the price of a nice, used car.

SC

**AnalogRocks** · Posted: Thu Jan 29, 2009 5:01 pm Post subject:

It reminds me of a helicopter rotor. With the pitch control and all.

David_Web · Joined: 02 May 2007 Posts: 418 Location: Sweden

"50W of Amp power= approx 210Db !!!! sweet!!!"

Eh. NO. Not really. Besides 194dB is the limit at one atm.
And nothing will get close to that.

And he did say 110dB.

jask · Joined: 17 Mar 2006 Posts: 10187 Location: kamloops BC

perisoft · Joined: 29 Aug 2007 Posts: 2920 Location: Ithaca, NY

**AnalogRocks** · Posted: Thu Feb 12, 2009 3:08 am Post subject:

WHAT!!?? WHAT'D YOU SAY?!! Very Happy