Today's Message Index:
----------------------
1. 01:53 AM - Re: Switch schematic (JOHN TIPTON)
2. 01:57 AM - Re: Switch schematic (JOHN TIPTON)
3. 02:13 AM - Re: Switch schematic (Carlos Trigo)
4. 07:38 AM - Re: Re: Any know is there a typical faliure mode for Soild State R (Robert L. Nuckolls, III)
5. 08:46 AM - Re: Re: Any know is there a typical faliure mode for Soild State R (Robert L. Nuckolls, III)
6. 09:03 AM - Re: Any know is there a typical faliure mode for Soild State Relays (Eric Page)
7. 09:41 AM - Re: Any know is there a typical faliure mode for Soild State Relays (Robert L. Nuckolls, III)
8. 10:08 AM - Re: Any know is there a typical faliure mode for Soild State Relays (Jeff Luckey)
9. 10:32 AM - Re: Any know is there a typical faliure mode for Soild State Relays (Eric Page)
10. 11:29 AM - Re: Landing Lights (Eric M. Jones)
11. 03:56 PM - Re: Any know is there a typical faliure mode for Soild State Relays (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Switch schematic |
Hi Carlos=0A=0AYes: that would certainly do what you want, they do do one w
here the switch is not locked out in the on position, convenient for a quic
k flip to switch off=0A=0AJohn
Message 2
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Subject: | Re: Switch schematic |
PS: I may have one which you can have - away at the moment (day after Boxin
g Day) will let you know=0A=0AJohn
Message 3
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Subject: | Switch schematic |
Thank you John
Merry Christmas!
Carlos
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of JOHN
TIPTON
Sent: segunda-feira, 23 de Dezembro de 2013 09:57
Subject: Re: AeroElectric-List: Switch schematic
PS: I may have one which you can have - away at the moment (day after
Boxing Day) will let you know
John
_____
From: Carlos Trigo <trigo@mail.telepac.pt>;
Subject: AeroElectric-List: Switch schematic
Sent: Sun, Dec 22, 2013 6:11:10 PM
Guys
Since I am not sure if this switch will suite my need
can somebody please post a drawing of its eletric schematic.
Thanks
Carlos
P.S. =93 I am looking for a switch for the fuel pump that can be
powered from 2 independent power sources, being the middle position the
OFF position
Message 4
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Subject: | Re: Any know is there a typical faliure mode |
for Soild State R
At 08:08 PM 12/22/2013, you wrote:
>
>There is arguably no "typical" failure mode for anything at all.
>
>If there were, the engineers would be happy to see it because it
>would be an easy fix.
>
>A failure can be "typical" if a device is being misused. "Hey, the
>device typically fails if being misused!" I'll bet there are a
>million engineering stories there.
PRECISELY!!!! Further, it's an incomplete
analysis for all the concerns if one does not
also consider installation generated failures.
Screw fell out, wire pulled out of terminal,
fault in the controlling circuitry, etc. etc.
Doing an FMEA seems like a daunting task but
it gets easier if you ignore all the detail
reasons WHY it might fail and concentrate
on HOW if fails: (1) doesn't close on command
or (2) closed without command. The WHY is
irrelevant.
Take those two conditions and run
them through the failure detection
and response tree. What are your options
for dealing with either of those two
failures in flight . . . and can the failure
'hide' . . . is it pre-flight detectable
such that you don't take off with an already
failed component.
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.
Your prime directive as the one and only
flight safety manager for your project is
to design for failure tolerance.
Bob . . .
Message 5
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Subject: | Re: Any know is there a typical faliure mode |
for Soild State R
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=B7er, saf=B7est
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 . . .
Message 6
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Subject: | Re: Any know is there a typical faliure mode for Soild |
State Relays
On Dec 22, 2013, at 10:51 PM, Jeff Luckey <jluckey@pacbell.net> wrote:
> they sure are pricey - $130 ea. @ Mouser, ouch!
eBay is your friend. A search for "SSR 100A" returns 91 hits, including app
ropriate heatsinks, starting at ~$9 delivered.
This presumes the words "China" and "Hong Kong" don't scare you. For solid s
tate devices like these, I wouldn't lose any sleep.
Eric
Message 7
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Subject: | Re: Any know is there a typical faliure mode for |
Soild State Relays
At 11:02 AM 12/23/2013, you wrote:
>On Dec 22, 2013, at 10:51 PM, Jeff Luckey
><<mailto:jluckey@pacbell.net>jluckey@pacbell.net> wrote:
>>they sure are pricey - $130 ea. @ Mouser, ouch!
>
>eBay is your friend. A search for "SSR 100A" returns 91 hits,
>including appropriate heatsinks, starting at ~$9 delivered.
>
>This presumes the words "China" and "Hong Kong" don't scare
>you. For solid state devices like these, I wouldn't lose any sleep.
Yes . . . but take care that you get a DC/DC
device . . . they LOOK just like the DC/AC.
Emacs!
Note the 5-60vdc rating on the output terminals
of this one.
I've ordered one of these to ponder and
perhaps bash on a bit . . .
http://tinyurl.com/l73b6lf
Bob . . .
Message 8
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Subject: | Re: Any know is there a typical faliure mode for |
Soild State Relays
what are the power dissipation stats on these devices?- I didn't see any
data on this in the EBay link...=0A=0A=0A=0A=0A____________________________
____=0A From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>=0AT
o: aeroelectric-list@matronics.com =0ASent: Monday, December 23, 2013 9:40
AM=0ASubject: Re: AeroElectric-List: Any know is there a typical faliure
mode for Soild State Relays=0A =0A=0A=0AAt 11:02 AM 12/23/2013, you wrote:
=0A=0AOn Dec 22, 2013, at 10:51 PM,=0AJeff Luckey=0A<jluckey@pacbell.net>
=0Awrote:=0A>=0A>they sure are pricey - $130 ea.=0A@ Mouser, ouch!=0A>eBay
is your friend.- A search for "SSR 100A" returns 91=0Ahits, including app
ropriate heatsinks, starting at ~$9=0Adelivered.=0A>=0A>This presumes the w
ords "China" and "Hong Kong" don't=0Ascare you.- For solid state devices
like these, I wouldn't lose any=0Asleep.=0A- Yes . . . but take care that
you get a DC/DC=0A- device . . . they LOOK just like the DC/AC.=0A=0A
=0A=0A- Note the 5-60vdc rating on the output terminals=0A- of this one
.=0A=0A- I've ordered one of these to ponder and =0A- perhaps bash on a
bit . . .=0A=0Ahttp://tinyurl.com/l73b6lf=0A=0A=0A=0A=0A=0A- Bob . . .
Message 9
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Subject: | Re: Any know is there a typical faliure mode for |
Soild State Relays
Good catch!
Eric
do not archive
On Dec 23, 2013, at 10:40 AM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
> Yes . . . but take care that you get a DC/DC device . . . they LOOK just like
the DC/AC.
Message 10
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Subject: | Re: Landing Lights |
AR111 are the same as PAR-36, which are common aircraft lights. You can check these
guys and the attached PDF. I have no connection to these guys. Caveat Emptor.
LED Orientalight Co., Limited
Website: http://www.orientalighting.com
Email: info@orientalighting.com;
There are a zillion makers of LED lights now. I always advise builders to buy LEDs
last. They will continue to get better every month. As always, you can make
your own with DIY parts see: DX.com
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=416145#416145
Attachments:
http://forums.matronics.com//files/ar111_dims_251.pdf
http://forums.matronics.com//files/ar111_led_light_12v_151.pdf
Message 11
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Subject: | Re: Any know is there a typical faliure mode for |
Soild State Relays
At 12:07 PM 12/23/2013, you wrote:
>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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