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Date: Mon, 23 Jan 2012 12:16:51 -0500
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Subject: Re: [LML] Steam Gauge Backup
From: Colyn Case <colyncase@earthlink.net>
In-Reply-To: <list-5360798@logan.com>
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References: <list-5360798@logan.com>

Bob/Ed,

Matt asked the question about what happens when a wet pump fails.   I =
happen to have an airwolf wet pump so I tried to figure it out.  I =
couldn't find the plumbing diagram but now I'm wondering if the airwolf =
sends oil back into the oil system or only lets it out via the air =
output.

Looking on the web I tried to find anything about failures.  One guy =
wrote in a blog that the "old wet pumps" make a bigger problem if you =
have an oil fire.   I suppose that would be true if you lit vaporized =
oil that came from the pump exit. but that would require burning through =
the hose that goes to the air/oil sep first.

Colyn

On Jan 23, 2012, at 7:50 AM, Robert R Pastusek wrote:

"The original question was, if you are going to have a backup, what kind =
of backup is preferred."


Group,

When we built our IV-P, the back-up system was a "wet" vacuum pump, =
which operated the artificial horizon.  The wet pumps have an excellent =
service life, having gone several thousand hours without overhaul.  We =
simply plumbed the discharge of the pump into the oil separator that was =
already there for the crankcase vent.  It worked for us and has also =
worked for a IV-P friend of ours who has over 1000 hours on his IV-P.  =
Before we installed the wet pump on his IV-P, he was losing pumps quite =
frequently.
It's old technology, but it works and doesn't require electricity.

Ed Smith
Chesapeake, VA


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