Today's Message Index:
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1. 07:34 AM - Re: History of the E-Bus (user9253)
2. 07:37 AM - Re: History of the E-Bus (Av8rrob)
3. 08:22 PM - Static Wicks - Bonding of Flight Controls (jsajpf)
Message 1
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| Subject: | Re: History of the E-Bus |
Each builder has their own ideas on how to wire their airplane. It would be nice
to offer more Z figures to give builders more electrical diagrams to choose
from.. Modern EFISs have a built-in low voltage warning. So the new Z figure
will not need low voltage warning. Many EFISs come with their own internal
backup battery that will last for an hour or more. Some builders might not want
or need an E-Bus. Below is a circuit without a separate E-Bus. But it does
have a relay in parallel with the battery contactor. That relay provides a
parallel current path similar to an E-Bus relay.
For normal operations, the master switch will be in up position. If the pilot
wishes to conserve electrical energy for any reason or if the battery contactor
fails, the pilot can move the master switch to the center position (endurance
mode). The power hungry battery contactor will be disabled and the relay
will turn on. Symptoms of battery contactor failure may be abnormal fluctuations
of system voltage.
The center position of the master switch is also useful for ground operations
such as electrical troubleshooting or just sitting in the aircraft learning how
to use the avionics. The relay uses a fraction of the power that a contactor
does. The starter is disabled with the master switch in the center position,
making it safer while working on the plane.
--------
Joe Gores
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http://forums.matronics.com/viewtopic.php?p=487834#487834
Attachments:
http://forums.matronics.com//files/contactor_parallel_relay_176.jpg
Message 2
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| Subject: | Re: History of the E-Bus |
Bob, I appreciate the back story. As a newbie builder I also appreciate the knowledge
and dedication that you have given the aviation community for so long.
My challenge has been to find a balance between too simple and too robust/complicated
in my layout. As I look at information put you by suppliers (garmin etc.)
other builders and wise pros like yourself its tough to sort though all the
opinions. Switched avionics bus ..... or not. E- bus ... or not. IBBS backup
battery.... or not. Brownout.....
In my previous posts youve challenged me to justify my modifications from your
tried and true and I guess the ideas Ive had come from wanting the simplicity
of the z-12 with the other opinions thrown into the mix. I will follow this thread
closely.
Thanks again
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487835#487835
Message 3
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| Subject: | Static Wicks - Bonding of Flight Controls |
Bob (et al),
Looking for insight into legacy Type Certificated airplane design rationale for
installing static wicks and bonding jumpers between fixed structure and movable
flight control surfaces.
Several E/AB designs do not specify installation of static wicks nor bonding jumpers
for flight control surfaces. The particular design I plan to build is among
this group and reports from those with years flying the design are (albeit
a limited number of respondents): no issues with P-static and the like.
I cannot attest to the types of operations, nor how frequent the exposure to conditions
conducive to P-Static interference, for the respondents to my query.
Looking for input from TC house folks (Bob) regarding rules of thumb, design standards,
etc. regarding incorporation of static wicks and bonding??
My experience with the subject matter is as a maintainer, troubleshooting reports
of symptoms of P-Static while in visible moisture, required inspections after
a lightning strike, routine verification (inspections) of electrode-to-surface
bonding values, etc. Correction of broken or degraded control surface bonding
cured the majority of reported faults. Some degraded antenna bonds are among
the mix as well. Design standards applicable to mitigating P-Static trouble
are not clear to me and my understanding of design criteria/recommendations
is admittedly academic (at best).
What say ye, the sage?!
John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=487843#487843
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