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isispower

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gcomfo(at)tc3net.com
Guest

Posted: Mon Nov 23, 2009 5:22 am Post subject: isispower

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Nov 23, 2009 9:06 am Post subject: isispower

At 07:19 AM 11/23/2009, you wrote:

 	  Quote: 	
		  

Bob:  Check out isispower.  I would appreciate your comments.



Gordon Comfort


	


    Hi Gordon! Good to hear from you. I've had several folks

    send me the link on this line of product. Thanks to all

    for the heads-up.



    Let's consider the words and images used to induce

    customers to purchase this product . . .



http://www.isispower.com/V8_interview.php



    There's also a library of installation and

    user's manuals at:



http://www.isispower.com/isis-installation.html



    I didn't go through these in detail but at no

    time did I see any sort of block diagram or

    all-up wiring diagram that describes an exemplar

    installation. But questions to be asked and

    answered:



    (a) does the proposed system reduce numbers of

     switches or controls on panel along with wiring

     and real estate allotted to those components?



    (b) how many devices in your proposed airplane

     project require you to switch a current level

     that places the switch at risk for extra-ordinary

     rates of failure. Careful here . . . don't mix

     service life (expected wear out) with reliability

     (failure due to poor design or choice of component).



    (c) how many devices or systems in the airplane

     cannot be handled by this product? This includes

     things like legacy magnetos, audio switches, etc.



    (d) how does inclusion of this product in your

     airplane change your failure modes effects analysis

     for the purpose of crafting Plan-A/Plan-B responses

     to failure of any one system?



    (e) how does inclusion of this product affect

     probability of single points of failure for

     multiple systems?



    (f) does your comfortable incorporation of this

     or any similar system depend on some notion of

     super-reliability or exemplar service life. I.e,

     "THIS gizmo is NEVER going to malfunction".



    (g) some lengths of wire between control switches and

     controlled devices are replaced by data bus

     conductors between "smart modules". What is the

     weight savings for these conductors as compared

     to the weight of the proposed "smart modules"?



    (h) when and if problems do happen, what is the

     likelihood that YOU as a system integrator will

     be tooled and skilled in fixing the problem . . .

     or will you be dependent upon outside support

     or canned diagnostics?



    (i) how does incorporation of this product make

     your installation task any simpler than running

     a conductor path from fuse to switch to accessory?

     If your design goals include buffering stresses

     on the switch by inclusion of a power relay, how

     much $time$ is expended in the installation of

     the relay, one extra wire and allocation of one

     extra fuse to the task?



    (j) you still have to run SOME gage and length of

     wire from each control device to a smart module

     at the head-end. You still have to run the SAME

     gage of wire to each accessory from the smart

     module at the tail-end. If you have only one tail-end

     smart module where actual power handling takes

     place, is this not about the same situation as

     the fabrication of a breaker panel or array of

     fuse blocks?



    (k) think hard about this "weight reduction"

     thing. If you're using fuse blocks and the SAME

     or perhaps slightly smaller switches. What is

     the likelihood that the combination of smart

     modules comes out lighter than the sum total

     of wire weight eliminated?



    (l) finally, assuming consideration of all the

     above produces conclusions consistent with your

     design goals. Suppose you spend under $100

     for all switches, relays, wire, and fuse

     blocks to handle the tasks we've accepted

     and lived with for nearly 100 years of operating

     airplanes. What is the return on investment

     for delta-dollars need to acquire this system?

     Would the difference buy you a nice hand-held

     GPS or radio for the flight bag?



It would be best if you did this exercise for yourselves

with input from your brothers here on the List. It's

best that the make/buy decision is made from a position

of understanding and meeting personal design goals than

to rely on anybody's advice.



    Bob . . .

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marcausman

Joined: 08 Feb 2007
Posts: 70

Posted: Wed Dec 16, 2009 3:33 pm Post subject: Re: isispower

Well, the turn signals, horn, and high beams are great new features for airplanes. Be the first on your block...



Seriously though, this product is designed for automobiles. Vertical Power is designed for aircraft and therefore it's working in its intended environment.

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_________________
Marc Ausman
http://www.verticalpower.com "Move up to a modern electrical system"
RV-7 IO-390 Flying

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