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Avionics and essential Buss?

 
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rparigor(at)SUFFOLK.LIB.N
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PostPosted: Tue Jan 24, 2006 9:53 pm    Post subject: Avionics and essential Buss? Reply with quote

Working on schametic for Europa Rotax 914.

2 Questions:

1) What is the benefit to installing a Avionics Buss master switch when
all the Avionics have a switch of their own?

2) What does and does not belongs on a Essential Buss?

Thx.
Ron Parigoris


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nuckollsr(at)cox.net
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PostPosted: Wed Jan 25, 2006 3:56 am    Post subject: Avionics and essential Buss? Reply with quote

At 05:49 AM 1/25/2006 +0000, you wrote:

Quote:


Working on schametic for Europa Rotax 914.

2 Questions:

1) What is the benefit to installing a Avionics Buss master switch when
all the Avionics have a switch of their own?

Good question. A better question yet is "What benefit
is the avionics master switch at all beyond some
convenience factor?" The "need" for an avionics
master was ill-conceived and the first place and much
fertilized with myth and reverence for tradition since.
See:

http://aeroelectric.com/articles/avmaster.pdf
Quote:
2) What does and does not belongs on a Essential Buss?

ENDURANCE bus is the better term. See chapter 17
of the 'Connection.

Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >


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highflight1(at)gmail.com
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PostPosted: Wed Jan 25, 2006 4:15 am    Post subject: Avionics and essential Buss? Reply with quote

2 Questions:
Quote:

1) What is the benefit to installing a Avionics Buss master switch when
all the Avionics have a switch of their own?

None. An avionics master switch is nothing more than a place to have a
single point of failure that would wipe out ALL your avionics at one time.

2) What does and does not belongs on a Essential Buss?

All you want on the essential buss are those things that allow you to get to
a place to land safely. How much that ends up being depends a lot on how you
design your electrical system and what you feel you NEED to keep working.
No matter how you design your panel, you NEED to have a voltage alarm so you
know immediatly when/if your alternator drops out so you can change your
flight plan if need be.

Vern W.
Quote:





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lhelming(at)sigecom.net
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PostPosted: Wed Jan 25, 2006 4:37 am    Post subject: Avionics and essential Buss? Reply with quote

Subject: Avionics and essential Buss?
Quote:


Working on schametic for Europa Rotax 914.

2 Questions:

1) What is the benefit to installing a Avionics Buss master switch when
all the Avionics have a switch of their own?

With the separate switch the original settings, I.E., volume on the
radio and/or intercom can be left at the last setting thereby not needing to
fiddle with them for each new flight. I have turned the radio volume too
low at start up a couple of times and thought I was having a radio failure
before I found I had just failed to turn up the volume up sufficiently.
Quote:

2) What does and does not belongs on a Essential Buss?

Usually the radios and other devices needed to fly the plane safely
are powered through the e-bus so to have an alternate path. Put the
avionics switch in the wire path between the main bus feed and the rectified
diode that feeds the e-bus. Devices like an engine monitor are not
essential and should not be put on the e-bus. Think about what is important
if your alternator quits working and what you absolutely need to finish your
flight for the type of flying you plan to do as the answer varies depending
on type of flying. Hope this helps.
Quote:

Thx.
Ron Parigoris

Indiana Larry, RV7 Tip Up 79 hours


"Please use the information and opinions I express with responsibility, and
at your own risk."
Quote:






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hdwysong(at)gmail.com
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PostPosted: Wed Jan 25, 2006 8:23 am    Post subject: Avionics and essential Buss? Reply with quote

Hi Ron -

2) What does and does not belongs on a Essential Buss?
Quote:


Thus far, our 914 "essential" bus includes one fuel pump and the TCU. The
latter might get removed because losing the TCU *shouldn't* trash the engine
(per the manual)... but I haven't warmed up to that thought, yet.

D


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