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Any know is there a typical faliure mode for Soild State

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nuckolls.bob(at)aeroelect
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Posted: Mon Dec 23, 2013 8:46 am Post subject: Any know is there a typical faliure mode for Soild State

I wrote:



 

 The SAFE airplane is one that produces

 benign and/or predictably managed failures.

 If parts on airplanes never failed, FBOs

 would be out of business.



   A pox on my head! . . . I've been trying

   to eliminate the word 'safe' from the

   lexicon of airplanespeak . . . but the

   damned word is so terribly embedded in

   the utopian quest by those-who-know-more-

   about-airplanes-that-we-do that the

   thing just slips out now and then.  



   I will suggest that no airplane

   ever was or ever will be safe . . .



 Safe



 adj. saf·er, saf·est 

 1. Secure from danger, harm, or evil.

 2. Free from danger or injury; unhurt: safe and sound.

 3. Free from risk; sure: a safe bet.

 4. Affording protection: a safe place.

 5. Baseball Having reached a base without being put out, as a batter or base runner.



   An airplane is one component of a

   transportation system with strict limits

   for operation . . . limits that impose

   harsh penalties for failure to respect.



   The things we do in the name of 'safety'

   can only go to the reduction of risk.

   Admittedly, some efforts may produce

   huge reductions in risk . . . like making

   sure those strut bolts are Grade 8 and

   not pulled from the bin of stove bolts

   at the hardware store.



   The Feb 2014 issue of Kitplanes has

   several articles that speak to the

   art and science of risk reduction.

   One article in particular is written

   by a pilot who crashed his RV10 and

   lived to write about it. However,

   unlike the vast majority of what I

   call 'dark-n-stormy-night' stories

   popular with the journals, THIS article

   stands out as being especially introspective

   and analytical as to cause/effect and

   RISK REDUCTION.



   I'm going to check with Paul about archiving

   these articles on our website too. They

   are exceedingly germane to the thought

   processes that we strive to promote here

   on the List.



   We cannot build a safe airplane but

   we can build one and operate it in

   a manner that offers very low risk.



 

   Bob . . .    [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Dec 23, 2013 3:56 pm Post subject: Any know is there a typical faliure mode for Soild State

At 12:07 PM 12/23/2013, you wrote:

 	  Quote: 	
		  what are the power dissipation stats on these devices?  I didn't see 

any data on this in the EBay link...


	


   You'll have to get your hands on one and measure it.



   I bought a similar one a couple years ago and after seeing

   how high the on-resistance was, I pitched it.

   I'm betting they're getting better.



   In any case, they are CERTAINLY suited to switching

   mundane loads with just mounting surface as a heat

   sink . . . the question is . . . how many calories

   do you need to handle at high current.



   Even so, as a relay controlling a hydraulic pump

   for landing gear, simpler mass-sinking would probably

   suffice given the intermittent duty service

   in a landing gear system.



   Will let you know what I find out when my sample

   part gets here.  I've got a 100A power supply

   around here somewhere . . .

   Bob . . .

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