REFLECTOR: Redundancy (was Compass)
Keith Hallsten
KeithHallsten at quiknet.com
Tue Apr 25 22:13:01 CDT 2006
Yes, I have not yet decided whether to use a little second battery or to use
a twin of the "main" battery as the back-up battery. It's likely to be
determined by weight & balance considerations. The main battery does not
have to be particularly large or heavy if a sealed lead-acid battery is
selected. Since I'm not using a vacuum system, I put the B&C SD-8 PM
alternator on the vacuum pump pad. That provides quite a bit of redundancy
in the electrical system. The electrical system will also be divided into
separate buses so that a fault can be isolated. I will have a feed from
each bus to the GRT EFIS.
Keith
_____
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Dave Dent
Sent: Tuesday, April 25, 2006 9:57 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Compass
I would also install a back up for the GRT. It can take two back ups. I
put in a 12V5Ahr li-ion battery as a back up. But you can get a small 7Ahr
lead acid and do the same. It will just be a little heavier. I turn mine
on while doing test with just the ship's battery on. When the gear pump
cycles it drops my GRT/EFIS screen of line for a second. So by turning on
the back up, it keeps it on line. I charge my EFIS battery every 50 hrs
weather it needs it or not, normally it don't. I keep it separate from all
other systems, including the charging system.
----- Original Message -----
From: Keith <mailto:KeithHallsten at quiknet.com> Hallsten
To: 'Velocity Aircraft <mailto:reflector at tvbf.org> Owners and Builders
list'
Sent: Monday, April 24, 2006 9:03 PM
Subject: RE: REFLECTOR: Compass
Whether or not it's strictly required, it seems like a pretty good idea, and
doesn't cost much. I'm putting in the GRT EFIS with a magnetometer, but I
will definitely install an old-fashioned whiskey compass against that day
when nothing in the panel works!
I will also keep a hand-held Comm radio with fresh batteries in the flight
bag, and have a portable GPS up and running that will revert to its own
batteries if the entire ship's electrical system goes out to lunch. It's
not that I have no confidence in my ability to install and maintain a
reliable electrical system; I just believe it's prudent to have a workable
"Plan B" for the failure of ANY component of the aircraft if at all
possible. When it comes to most aircraft systems, it's both possible and
practical.
Keith Hallsten
_____
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Joe Ewen
Sent: Monday, April 24, 2006 6:10 PM
To: Velocity Aircraft Owners and Builders list
Subject: REFLECTOR: Compass
A quick compass question. If the AC is equipped with a glass panel that
provides magnetic compass heading, is a mechanical compass still required?
Thanks,
Joe
_____
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