Date:         Thu, 6 Aug 2009 10:37:03 -0700
Reply-To:     neil N <musomuso@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         neil N <musomuso@GMAIL.COM>
Subject:      Re: Dometic Rear Fan *prop* Better than CPU Fan?
Comments: To: David Beierl <dbeierl@attglobal.net>
In-Reply-To:  <4a79e410.1f068e0a.2b69.5027@mx.google.com>
Content-Type: text/plain; charset=ISO-8859-1

On Wed, Aug 5, 2009 at 12:38 PM, David Beierl<dbeierl@attglobal.net> wrote:

> Muffin (R) and similar box-type fans are designed to be thin so as to mount
> easily into equipment chassis and such.  As such they have coplanar motors
> and in the smaller sizes (less than 8-inch, say) there isn't much room for
> the fan blades.  As such they run fast and noisy for a given output.  The
> Dometic fan OTOH was designed to run slow and quiet (rated input power is
> 0.7 watts, BTW, about 60 ma -- so at 270 ma yours obviously has problems or
> is in fact not an original) without regard to size.
>


Thanks David.

Appreciate the insights into fan design. Makes total sense. I can see
what you mean in terms of blade design.

Likely my Dometic motor dirty inside and/or has worn armature
bushings. Found it curious there was such a relatively high draw for
what looks like a small motor. Either that or I used my VOM
incorrectly. Pretty sure it was wired in correctly though.

Neil.

-- 
Neil Nicholson '81 VanaJetta 2.0 "Jaco"

http://tubaneil.googlepages.com/

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines