We get ~100kg of dry ice delivered to our lab every day, so I can definitely snag some for you Eric to give some ideas a try before we totally commit. Just let me know when you want me to snag it.<br><br>An alternative idea may be to use finely atomized water vapor instead of smoke. It should give the same effect...although it could leave you a bit um....soaking wet. Also, mini fog machines have totally already been made in the aerospace industry for wind tunnels. Perhaps we can try to adapt something like that? (see <a href="http://www.aerolab.com/Display_Pages/SMK_Gen.html">http://www.aerolab.com/Display_Pages/SMK_Gen.html</a> for ideas)<br>
<br>Sean<br><br><div class="gmail_quote">On Fri, Jun 4, 2010 at 1:04 AM, Rachel McConnell <span dir="ltr"><<a href="mailto:rachel@xtreme.com">rachel@xtreme.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I have actually seen a costume (last weekend even) that used some kind<br>
of smoke machine (it was a Steam Punk costume, a woman with a mohawk had<br>
made a headdress that produced a steam-like fog). She said it was<br>
nontoxic and it was attached to her belt so it was definitely portable.<br>
I will try to track her down and ask about it b/c it would be the<br>
perfect thing for this.<br>
<font color="#888888"><br>
Rachel<br>
</font><div><div></div><div class="h5"><br>
Eric Boyd wrote:<br>
> So, we're probably going to need fog machines of some sort in order to<br>
> make the beams from the laser properly visible.<br>
><br>
> There are basically three types of fog generators:<br>
><br>
> 1) Chemical, using heat to vaporize "fog juice". This is what clubs use.<br>
> They typically require a ~kW of power for the heater, and 5 minutes to<br>
> warm up. Obviously that'll never be wearable. But, maybe some small<br>
> wearable version could be built somehow? I'm thinking of some kind of<br>
> tiny heater, and a way to "drip" the fog juice. Not sure how much fog<br>
> you could get that way though, even if you pulled it off. Almost<br>
> certainly not the solution we need. Interestingly, you can get these<br>
> fog machines surprisingly cheap, I found several at the $50 price point.<br>
> Fog juice is about $20/gallon. Does noisebridge need a fog machine?!?<br>
><br>
> 2) Ultrasonic. Basically, mechanically force vapor out of water. Makes<br>
> a heavy (sinking) fog. Still has fairly large power requirements,<br>
> typically 24V @>1 amp, i.e. 25W or more - possible for batteries, it'd<br>
> be heavy, but doable. This usually only yields a small amount of fog,<br>
> suitable for e.g. a small fountain. Maybe that's sufficient. Can't be<br>
> used with fog juice, it gums up the ultrasonic emitter (darn!). Overall<br>
> I don't think it could be made to work.<br>
><br>
> 3) The winner: dry ice. Simply add water to dry ice and presto, fog.<br>
> Primary concern is safety, dry ice is dangerous. Still, I think this is<br>
> the clear choice. You could have a little hand-pump to meter out the<br>
> water into a chamber in e.g. a backpack, and tubes to guide the fog<br>
> where you want it. Bonus points if you can engineer the dry-ice chamber<br>
> into your laser costume somehow :-). Anyone know where I could buy some<br>
> dry ice in the Mission?<br>
><br>
> One final thing: you could just actually use smoke, i.e. burn something.<br>
> It might be harder to control that though. Perhaps the use of<br>
> something like Smoke Candles?<br>
><br>
> <a href="http://www.qasupplies.com/2001000.html" target="_blank">http://www.qasupplies.com/2001000.html</a><br>
><br>
> Eric<br>
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