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Re: exp-bus

 
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nuckollsr(at)cox.net
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PostPosted: Sun Jan 08, 2006 10:38 am    Post subject: Re: exp-bus Reply with quote


At 09:42 AM 1/8/2006 -0500, you wrote:
<densing(at)carolina.rr.com>
As a side note Bob has a low opinion of this product:
Yes he does. But I have one in a 6A and it is doing very well. Have never
had one problem with it. TT on unit/aircraft is 85 hours.
Dale Ensing

This is a VERY short comment on a LONG story that
does not explain . . . Folks interested in the
REST OF THE STORY are invited to read:
http://aeroelectric.com/articles/expbusad.html
and
http://aeroelectric.com/articles/expbusthd.html
The EXP-Bus probably performs as advertised. My
comments about this product have been to generate
dialog about the following observations:
Cost: The price of an EXP-Bus system will buy
all of the fuse-blocks, switches and miscellaneous
components needed to duplicate its functionality
several times over.
Architecture: If the EXP-Bus is EXACTLY what
you want in the way of architecture . . . great.
Any modifications wind up looking like . . . well,
modifications.
Cost of Ownership: The owner has lots of
dollars tied up in the product before any time
is invested to install it. Any component requiring
replacement later must fit the EXP-Bus package . . .
substitutions won't fit.
The major attractions to products like these
are: "Gee, look at that really slick panel already
fabricated and ready to install" and "Wow! Look
at all those electrowhizzies soldered to that
etched circuit board. I could never do that myself."
When a prospective buyer considers purchase, questions
never asked and answered are:
(1) "If I had my druthers, would I ever choose to DO
it exactly that way?" and . . .
(2)"Hmmm . . . that panel has a switch I won't
use or Hmmmmm . . . . the panel doesn't have a
switch I want. Are there ways to fabricate an equal
to or better looking switch panel that exactly meet
my needs?"
(3)"Why would I ever choose to fabricate and
populate an etched circuit board with all those goodies
unless it
(a) reduces wight,
(b) reduces cost to fabricate,
(c) reduces time to completion,
(d) reduces cost to maintain, and/or
(e) increases reliability.
I invited the EXP-Bus designer to address
(a) thru (e) but he declined. My "low opinion"
of this product has nothing to do with advertised
functionality or safety. It's about return on
investment and narrowing one's options both
for system design and future maintenance or
planned modifications.
The answer to (1) is, "Yes". there are many options
for choices in system architecture, none of which
are difficult to assemble from their rudimentary
components. Further, perfectly adequate components
are available that DO NOT REQUIRE or even suggest
use of an etched circuit board which only drives
up total labor (that's why it costs so much) and
parts count.
The answer to (2) has been discussed here on the List
in some detail. I'll suggest, "Yes". There are many
viable options for the builder to craft exactly the
panel functionality and appearance he/she wants.
To date, the answer to (3) is, "No good reasons".
There are no value-added advantages for choosing
EXP-Bus over piece-by-piece design and assembly
except in those cases where the builder accepts the
EXP-Bus limitations and is willing to pay a premium
price to avoid construction of a switch panel with
the necessary switches. The real and apparent
complexity of the EXP-Bus as a turn-key product is
a strong selling point but only when the customer
is unaware of simple options that do just as much
as the EXB-Bus -AND- with positive responses to
points 1-5 above.
Bob . . .

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Jerry2DT(at)AOL.com
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PostPosted: Mon Jan 09, 2006 12:17 pm    Post subject: Re: exp-bus Reply with quote



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mick-matronics(at)rv8.ch
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PostPosted: Mon Jan 09, 2006 2:29 pm    Post subject: Re: exp-bus Reply with quote


Quote:
...
EXBUS pretty much locks you in for architecture, may be o.k. for those who don't
care to deal at all with electrons. For me, it has been the most enjoyable
part of the project so far. I do believe the Subaru conversions, at least
Eggenfellner, require it, don't they?

He recommends it, but it is not a requirement. I'm not using the
EXPBUS. I've got a Z11 + Z30 going.
http://www.rv8.ch/article.php?story=20041121101637759
--
Mickey Coggins
http://www.rv8.ch/
#82007 finishing
do not archive


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