From: m35products (m35prod@optonline.net)
Date: Mon Jul 04 2005 - 13:05:47 PDT
I have generally found that two DC fans in series results in the following:
One fan stalls, and passes all the current to the other, which spins at
twice its rated speed.
I found out the hard way when trying to fit a 12-volt eemergency light bar
to a 24-volt M35/fire engine. The pairs of equivalent lamps were wired in
series, so they worked OK. However, the motors which rotate the sealed beams
performed as described above.
apb
www.M35products.com
----- Original Message -----
From: "Chris Brunner" <cjbrunner@optonline.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Monday, July 04, 2005 12:51 PM
Subject: Re: [MV] m38a1
> Computer fans are powered by 12v DC. If one were to wire the two fans
> in series they could successfully use them on a 24v system. If you
> salvage fans from an old computer, clean them with compressed air being
> sure to hold the blades stationary. Although they make a cool siren
> noise when spinning from the air pressure it destroys them almost
> immediately.
>
> Chris
>
> Bill Kealey wrote:
>
> >TJ, I have no idea how electricity works ... something to do with Voo Doo
> >is my guess. But, adding to Patricks comments ...
> >
> >I am probably wrong but, don't some of the personal computer cooling fans
> >run off of low voltage DC?
> >
> >Maybe you could find one in the right voltage. I have had success in the
> >past with guys at the electronics repair shops rigging up different
doohickeys
> >or thingamajigs to make electronic (magic stuff to me) gadgets operate
with
> >different voltages than I had available as a source. Inverters?
Converters?
> >Perverters?
> >
> >Perhaps you could put together a box with one end holding a filter,
> >B&S lawn mower engine filter mounted on one end and a hose on
> >the other should work with the fan in the middle. These fans are
> >only a couple of inches in diameter and very thin. If enclosed under
> >the dash or someplace else out of the way but sheltered from moisture
> >should run a long time and don't use a lot of power. They do provide
> >a good movement of air for cooling and are relatively silent.
> >
> >Perhaps "Radio Shack" or other electronics store has a better fan to
> >suit your needs.
> >
> >Hope this isn't just rambling, as I do that a lot, but helpful in some
way.
> >
> >Bill K.
> >
> >********************
> >
> >From: "Patrick Jankowiak" <recycler@swbell.net>
> >
> >
> >I don't know much about the M38, but how about a small surplus
> >24V DC blower or a small fan plumbed to a 1" hose going into the
> >distributor housing? the fan could draw cooler air from somewhere
> > convenient. All you should need is about 2 or 3 CFM across the
> >coil, if you can draw cool air in.
> >
> >
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> >
> >
>
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This archive was generated by hypermail 2.1.4 : Fri Oct 28 2005 - 23:22:15 PDT