I need two.

[irishbreed]

Provided Link: http://www.eminent-tech.com/RWbrochure.htm


Have you all seen this? <A HREF="http://www.eminent-tech.com">www.eminent-tech.com</A>

[shawn_a]

Yeah it made some waves (pun intended) here awhile back. From everything I've heard and read, it's the real deal and does a phenomenal job at testing the structural integrity of your home's construction. Think along the lines of a helicopter main rotor that fits in your home. Same basic principle the way I'm understanding the design. I only hope the price slides down to a level where I could even start dreaming about owning one.

shawn

[klaus]

http://www.betteraudio.com/geolemon/servoproject/servosb2.jpg

Provided Link: Or build this one... (http://www.betteraudio.com/geolemon/servoproject/)


Yep, it’s just a fan with, plus and minus, variable pitch blades. The blade shape minimizes noise and it’s placed inside a box with sound dampening material to knock out and out-of-band whirring type air noises that are produced.

Just get yourself a collective for a model R/C helicopter, connect it to and old washing machine motor and hook the pitch control to a R/C servo modified such that it’s position is proportional to amplitude from your low-frequency pass filter. Cut the blades out of carbon fiber sheet, following the pattern on the web page, for that high-tack look. Put the mess inside a big box with fiberglass and chicken wire lined walls. (The chicken wire keeps the fan, errr, rotary woofer from blowing fiberglass shreds through you house.) Mount it as you would an IB sub driver.

[rex]

>Gee, I was getting all exciting and ready to dish out the $12,900 until I saw that the amplifier and cross-over were not included! LOL

[jtaylor]

> Have you all seen this?
> <A HREF="http://www.eminent-tech.com">www.eminent-tech.com</A>

I spent many years working on the UH-1H HUEY Helicopter flight simulator and it was really neat how they simulated the effect and sound of the main rotor. The mixing of various noise generators controlled by Voltage Controled Oscilators were used to generate the sound effects. For the Main Rotor Motion effect they used a servo driven Hydraulic powered seat shaker. It would take several hours to get the sound and seat motion set up to get that very last thump to coincide just pefectly on start-ups and shut-downs of the turbine and main rotor.

The HUEY Helicopter also had a very violent resonant frequency that occured around 21-22 KTS that would shake the frame realy hard, which meant you had to pass through that speed range very quickly to keep from shaking the helicopter to pieces. I was a really neat experiene to work on those helicopters until I moved on to other aircraft such as the F-4 Phantom fighter jet, and the C-130 Hercules.

[jonpike]

Wow... wonder what happened? Sounded like near completion, then no updates since 6-03.