RE: [DMCForum] Drum roll please!

["Travis Goodwin" <tgoodwin@xxxxxxxxxxxx>]

I've been pretty happy with the performance so far, but I might mess with
the fans a little more and see what I can come up with. The fans can't be
on
the outside of the box, but I might create some sort of shroud for them.

As for the duct, the flexible dryer duct was for testing. I have the rigid
duct awaiting installation.

> -----Original Message-----
> From: Walter Coe [mailto:Whalt@xxxxxxx]
> Sent: Thursday, September 12, 2002 2:26 PM
> To: DMCForum@xxxxxxxxxxxxxxx
> Subject: Re: [DMCForum] Drum roll please!
> 
> Travis,
> 
> I have some thoughts on improving the efficiency of your smoke system.
> 
> First some background:
> Squirrel cage fans are used to blow air; propeller fans are used to suck
> air.  Consider applications you've seen before, and they usually choose
> the
> right kind of fan for the job.
> 
> So if you are looking for an increase in efficiency over what you have
so
> far, try moving the fans to the other ends of the ducts.  Or try using
an
> auto a/c squirrel cage blower in the distribution box instead.  That
would
> make a substantial difference at accelerating the smoke -- especially if
> you
> had it turn on a few seconds after the smoke generator started up.  The
> presence of a blower motor will add to the time machine clutter AND it
> will
> actually be functional too.
> 
> It looks like you used flexible clothes dryer duct.  That gives even
more
> resistance to the fans.  And it may not hold up well driving at moderate
> speeds.  You might consider pre-formed rigid sheet metal duct (ala Home
> Depot) or PVC pipe with large radius elbows meant for drain waste
disposal
> (DWD spec).
> 
> I'm considering some kind of modification to the a/c ducts in my car for
> two
> reasons.  First, the accordion-pleated ducts create a lot of turbulence,
> and
> turbulence = noise which my car has plenty of since I normally use the
> blower on high speed.  Second, if I don't use my car for a week, then
the
> a/c smells moldy & stinks my car up until I clear it out.  I thought I
had
> a
> lot of leaves composting in it, but when I took the unit out of the
dash,
> there were only a couple of leaves.  Or does stuff just grow on the
> evaporator?  It looked clean.  I'm thinking about substituting a light
> gauge
> PVC pipe, say a Schedule-20, and shaping it with a heat gun.  It
couldn't
> hurt to try, and the modification would be completely reversible.
> 
> That moderated digest version is going to be really hairy to get set up
> (and
> caught up).  Starting with this paragraph there are 3 interrelated
> threads:
> time machine, a/c system & administrative.  It's going to take a little
> more
> programming to be able to have an "editor" insert hyperlinks.  Once
> debugged, it should all be a point & click issue.  If someone were
> following
> the thread on in-dash a/c ducts, for example, the links would skip to
the
> middle of this post and then to the beginning of the next digest which
> would
> then link to any related post in it and then to the next digest.  I'm
glad
> I'm not the programmer.  :-)
> 
> Walt
> 


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