Today's Message Index:
----------------------
1. 04:19 AM - Re: Strobe Noise (Ken)
2. 05:45 AM - Re: Strobe Noise (Jared Yates)
3. 06:18 AM - Re: Speaking of physics . . . (jan)
4. 08:25 AM - IVO Prop Current Limiter (Dennis & Anne Glaeser)
5. 09:38 AM - Re: Strobe Noise (Ken)
6. 01:46 PM - Re: Physics... (Dr. Andrew Elliott)
7. 02:46 PM - Re: Speaking of physics . . . (Robert L. Nuckolls, III)
8. 03:28 PM - Re: Re: Physics... (Henador Titzoff)
9. 03:52 PM - for physics lovers -- physics carols -- not aircraft related (Arthur Glaser)
10. 06:21 PM - Re: Speaking of physics . . . (Roger & Jean)
11. 10:04 PM - Re: Speaking of physics . . . (Fred Klein)
Message 1
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| Subject: | Re: Strobe Noise |
Jared
I had to install a $4. filter from a automotive audio supplier in line
with the power to the strobes for the same issue. I can still faintly
hear it with the engine off which confirms they are flashing.
Ken
On 13/12/2013 9:36 PM, Jared Yates wrote:
>
> Hello Bob, I've just recently started flying my Z13/8 Bearhawk, which has a steel
tube fuselage and aluminum wings. I'm getting a little bit of noise in the
headsets from the Aeroflash strobes. I wonder if you or the other list readers
can help me narrow down where to look for the source. The system that I
installed uses a power pack in each wingtip. The part of the strobe that flashes
is in a combination unit that has incandescent position lights, both red/green
and aft-facing white. I've replaced the incandescent bulbs with LEDs. I
routed power to the strobes from the main bus, via an unshielded conductor, in
a bundle out to each wingtip. They are grounded to the airframe locally at
the tips. My audio and mic jacks are isolated from the aircraft ground and in
shielded cables. The noise that I get is the same regardless of the volume position
on the Flightcom 403 intercom or the Garmin 430. It sounds a little bit
like a capacitor charging, sort of a "twe-tweeee"!
o!
> f increasing pitch that comes with every flash. It's faint enough that I can
hear it on the ground and while taxiing, but once I get up to cruise speed
and power it is drowned out. As such, it's not the end of the world if I can't
get rid of it, but I thought it was worth looking into. Thanks in advance for
any tips you might have.
>
>
Message 2
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| Subject: | Re: Strobe Noise |
Thanks Ken, do you remember anything about how you selected the filter,
such as what it would be used in or where you got it from?
On Sat, Dec 14, 2013 at 7:18 AM, Ken <klehman@albedo.net> wrote:
>
> Jared
> I had to install a $4. filter from a automotive audio supplier in line
> with the power to the strobes for the same issue. I can still faintly hear
> it with the engine off which confirms they are flashing.
> Ken
>
>
Message 3
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| Subject: | Speaking of physics . . . |
Rick,
Very interesting analysis .. one point to consider .. You could also say
that you have two sorts of 'builder/pilots' ...
Ones than like to build more than to fly ...
And the ones that like to fly more than they build ...
After all ... we all look for pleasure in many ways .... :-)
Jan
Do not archive
_____
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Richard
Girard
Sent: 14 December 2013 00:58
Subject: Re: AeroElectric-List: Speaking of physics . . .
Someone, I know not who, once said there are two kinds of airplanes, perfect
airplanes and those that fly. I once saw a Long EZ fuselage on which the
builder had spent 16 years addressing every little whim he'd ever had about
the perfect Long EZ. He died without ever seeing it take to the air. When I
saw it, it was on its way to its third owner and still had no wings or
canard. The step that deployed automatically with the canopy opening was
pretty cool, though.
Rick Girard
do not archive
On Fri, Dec 13, 2013 at 6:17 PM, Jeff Luckey <jluckey@pacbell.net
<mailto:jluckey@pacbell.net> > wrote:
Bob,
Your cursory and simplified analysis of the dynamics of switch vibration
neither has sufficient data nor analysis to draw any conclusions. (I don't
think you intended it to) Therefore it neither confirms nor refutes the
suggestion that sliders are used because they handle vibration better in RC
applications.
Let's talk about "..loose items ..":
I know you are not saying that the idea of "..loose items in the cockpit.."
is impossible. In other words, I believe we agree that it is possible for
foreign objects to get stuck in bad places. However, you seem to be rather
dismissive of the ideas I have put forward. The crux of your argument
seems to be based on the likelihood of a particular bad event.
Therein lies the problem - how to derive the likelihood. I suppose one could
scour NTSB accident records to search for incidents of bad thing X
happening. (But that requires a larger amount of effort than most of us are
willing or able to put forth. There are other considerations in doing
research of this nature - suffice it to say it is not a trivial task)
Therefore, in the absence of a probability for an event that is perhaps
unlikely but not impossible, I offer the following idea:
If there is a simple, easy, & cheap prophylactic action that can be taken to
prevent something bad, even if the bad thing is statistically remote (or the
statistics are unknown), then why not take that action?
The "why not" question is important because even seemingly benign solutions
have pros & cons and we certainly don't want the cure to be worse than the
disease. I ask that "why not..." question a lot and lately have been
getting less than satisfying answers.
-Jeff
_____
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com
<mailto:nuckolls.bob@aeroelectric.com> >
Sent: Friday, December 13, 2013 10:12 AM
Subject: Re: AeroElectric-List: Speaking of physics . . .
<nuckolls.bob@aeroelectric.com <mailto:nuckolls.bob@aeroelectric.com> >
At 05:26 PM 12/12/2013, you wrote:
<mailto:uuccio@gmail.com> >
>
> Hi Bob
> Any particular one which is relevant to aero electrics? There are 567 hits
for Walter Lewin lectures on the site...
> Sacha
ALL are relevant.
EVERY discipline reduced to the most fundamental
components will invariably illustrate principals
of motion, force, friction, dissipation of energy,
radiation, behaviors of materials, etc. etc.
I invoked a sampling of these ideas in our consideration
of risk for "loose items in cockpit" causing near
catastrophic events and a consideration of likelihood
that a slide switch is more resistant to vibration than
a toggle switch.
A great deal of what passes for considered decision
making is based on conclusions unsupported by the simple-ideas
in physics. Much of what I did during my last years
at Beech was to discover the constellation of operating
simple-ideas responsible for failure to perform . . .
troubleshooting down to the lowest common denominator.
A solid grounding in physics is the cornerstone
of virtually every other discipline . . . the whole
universe and every system within runs on simpe Support Your Lists This
Month get="_blank" href="http://www.aeroelectric.com/
<http://www.aeroelectric.com/> ">www.aeroelectric.com
<http://www.aeroelectric.com> www.mypilotstList
<http://www.mypilotstore.com/> Contribution Web -=========================
_blank">www.aeroelectric.com
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--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Rick,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Very interesting analysis .. one
point to
consider .. You could also say that you have two sorts of
‘builder/pilots’
…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Ones than like to build more than
to fly …<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>And the ones that like to fly more
than
they build …<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>After all … we all look for
pleasure
in many ways …. </span></font><font size=2 color=navy
face=Wingdings><span
style='font-size:10.0pt;font-family:Wingdings;color:navy'>J</span></fo
nt><font
size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Jan<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span
style='font-size:
10.0pt;font-family:Arial;color:navy'>Do not
archive<o:p></o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font
size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Richard
Girard<br>
<b><span style='font-weight:bold'>Sent:</span></b> 14 December 2013
00:58<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName
w:st="on">aeroelectric-list@matronics.com</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re:
AeroElectric-List:
Speaking of physics . . .</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'>Someone, I know not who, once said there are two kinds of
airplanes,
perfect airplanes and those that fly. I once saw a Long EZ fuselage on
which
the builder had spent 16 years addressing every little whim he'd ever
had about
the perfect Long EZ. He died without ever seeing it take to the air.
When I saw
it, it was on its way to its third owner and still had no wings or
canard. The
step that deployed automatically with the canopy opening was pretty
cool,
though.<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'>Rick Girard<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'>do not archive<o:p></o:p></span></font></p>
</div>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'>On Fri, Dec 13, 2013 at 6:17 PM, <st1:PersonName
w:st="on">Jeff Luckey</st1:PersonName>
<<a href="mailto:jluckey@pacbell.net"
target="_blank">jluckey@pacbell.net</a>>
wrote:<o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><st1:PersonName
w:st="on"><font
size=3 face=Tahoma><span
style='font-size:12.0pt;font-family:Tahoma'>Bob</span></font></st1:Per
sonName><font
face=Tahoma><span style='font-family:Tahoma'>,<br>
<br>
Your cursory and simplified analysis of the dynamics of switch
vibration
neither has sufficient data nor analysis to draw any conclusions. (I
don't
think you intended it to) Therefore it neither confirms nor refutes the
suggestion that sliders are used because they handle vibration better
in RC
applications.<br>
<br>
Let's talk about "..loose items ..":<br>
<br>
I know you are <i><span style='font-style:italic'>not</span></i>
saying that
the idea of "..loose items in the cockpit.." is impossible.
In other
words, I believe we agree that it is possible for foreign objects to
get stuck
in bad places. However, you seem to be rather dismissive of the
ideas I
have put forward. The crux of your argument seems to be
based on
the likelihood of a particular bad event.<br>
<br>
Therein lies the problem - how to derive the likelihood. I suppose one
could
scour NTSB accident records to search for incidents of bad thing X
happening. (But that requires a larger amount of effort than most
of us
are willing or able to put forth. There are other considerations in
doing
research of this nature - suffice it to say it is not a trivial
task)<br>
<br>
Therefore, in the absence of a probability for an event that is perhaps
unlikely but <i><span style='font-style:italic'>not
impossible</span></i>, I
offer the following idea:
<br>
<br>
If there is a simple, easy, & cheap prophylactic action that can be
taken
to prevent something bad, even if the bad thing is statistically remote
(or the
statistics are unknown), then why not take that action?<br>
<br>
The "why not" question is important because even seemingly
benign
solutions have pros & cons and we certainly don't want the cure to
be worse
than the disease. I ask that "why not..." question a
lot and
lately have been getting less than satisfying answers.<br>
<br>
-Jeff<br>
<br>
<o:p></o:p></span></font></p>
<div>
<div>
<div>
<div class=MsoNormal align=center style='text-align:center'><font
size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=1 width="100%" align=center>
</span></font></div>
<p class=MsoNormal><b><font size=3 face=Arial><span
style='font-size:12.0pt;
font-family:Arial;font-weight:bold'>From:</span></font></b><font
face=Arial><span
style='font-family:Arial'> "Robert L. Nuckolls, III" <<a
href="mailto:nuckolls.bob@aeroelectric.com"
target="_blank">nuckolls.bob@aeroelectric.com</a>><br>
<b><span style='font-weight:bold'>To:</span></b> <a
href="mailto:aeroelectric-list@matronics.com"
target="_blank">aeroelectric-list@matronics.com</a>
<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, December
13, 2013
10:12 AM<o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=3 face=Arial><span
style='font-size:12.0pt;
font-family:Arial'><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re:
AeroElectric-List:
Speaking of physics . . .<o:p></o:p></span></font></p>
</div>
</div>
</div>
<div>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'><br>
--> AeroElectric-List message posted by: "Robert L. Nuckolls,
III"
<<a href="mailto:nuckolls.bob@aeroelectric.com"
target="_blank">nuckolls.bob@aeroelectric.com</a>><br>
<br>
At 05:26 PM 12/12/2013, you wrote:<br>
> --> AeroElectric-List message posted by: Sacha <<a
href="mailto:uuccio@gmail.com"
target="_blank">uuccio@gmail.com</a>><br>
> <br>
> Hi <st1:PersonName w:st="on">Bob</st1:PersonName><br>
> Any particular one which is relevant to aero electrics? There are
567 hits
for Walter Lewin lectures on the site...<br>
> Sacha<br>
<br>
ALL are relevant.<br>
<br>
EVERY discipline reduced to the most fundamental<br>
components will invariably illustrate principals<br>
of motion, force, friction, dissipation of energy,<br>
radiation, behaviors of materials, etc. etc.<br>
<br>
I invoked a sampling of these ideas in our consideration<br>
of risk for "loose items in cockpit" causing near<br>
catastrophic events and a consideration of likelihood<br>
that a slide switch is more resistant to vibration than<br>
a toggle switch.<br>
<br>
A great deal of what passes for considered decision<br>
making is based on conclusions unsupported by the
simple-ideas<br>
in physics. Much of what I did during my last years<br>
at Beech was to discover the constellation of operating<br>
simple-ideas responsible for failure to perform . . .<br>
troubleshooting down to the lowest common denominator.<br>
<br>
A solid grounding in physics is the cornerstone<br>
of virtually every other discipline . . . the
whole<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'> universe and every system within runs on simpe Support
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target="_blank">http://www.aeroelectric.com/</a>"><a
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target="_blank">www.aeroelectric.com</a><a
href="http://www.mypilotstore.com/"
target="_blank">www.mypilotstList
Contribution Web
-========================
==<br>
<br>
<br>
<br>
<br>
<br>
</a><o:p></o:p></span></font></p>
</div>
</div>
</div>
</div>
<div>
<div><pre><b><font size=2 face="Courier New"><span
style='font-size:10.0pt;
font-weight:bold'><o:p> </o:p></span></font></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'><o:p> </o:p></span></fo
nt></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>_blank">www.aeroelec
tric.com<o:p></o:p></span></font></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>.com"
target="_blank">www.buildersbooks.com<o:p></o:p></span></
font></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>="_blank">www
.homebuilthelp.com<o:p></o:p></span></font></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>="_blank">www
.mypilotstore.com<o:p></o:p></span></font></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>ank">www.mrrace.com<
o:p></o:p></span></font></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>_blank">http://www.m
atronics.com/contribution<o:p></o:p></span></font></b></pre><pre><b><fon
t
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>ist"
target="_blank">http://www.matronics.com/Navigator?AeroEl
ectric-List<o:p></o:p></span></font></b></pre><pre><b><font
size=2 face="Courier New"><span
style='font-size:10.0pt;font-weight:bold'>tp://forums.matronics.com<o:
p></o:p></span></font></b></pre></div>
</div>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'><br>
<br clear=all>
<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span
style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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Message 4
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| Subject: | IVO Prop Current Limiter |
I was the requester for that design.
I built it, tested it, and used it for the last few years. Works perfectly!
I recently upgraded to an MT prop, so I sold the IVO along with the current limiter.
I don't know if that plane is flying yet.
Dennis Glaeser
Message 5
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| Subject: | Re: Strobe Noise |
Jared
The filter was intended for car radios. A black plastic cylinder with 3
leads - IN, OUT, Ground. There are several on ebay for around $6. but I
suspect they are easy to find at automotive suppliers especially if they
do radio installs. Here's one:
http://www.ebay.ca/itm/12V-NOISE-FILTER-HUM-KILLER-ENGINE-SUPRESSOR-POWER-WIRE-/260741326774?pt=LH_DefaultDomain_0&hash=item3cb564e7b6&vxp=mtr
Ken
On 14/12/2013 8:44 AM, Jared Yates wrote:
> Thanks Ken, do you remember anything about how you selected the filter,
> such as what it would be used in or where you got it from?
>
>
> On Sat, Dec 14, 2013 at 7:18 AM, Ken <klehman@albedo.net
> <mailto:klehman@albedo.net>> wrote:
>
> <mailto:klehman@albedo.net>>
>
> Jared
> I had to install a $4. filter from a automotive audio supplier in
> line with the power to the strobes for the same issue. I can still
> faintly hear it with the engine off which confirms they are flashing.
> Ken
>
> *
>
Message 6
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I sometimes recall, from my long-ago days at MIT, the tongue-in-cheek
last question on the final exam from 8.03 ' third semester Physics:
Given:
f=ma
e=mc=B2
Maxwell=92s equations
Derive:
Everything
Andy
------------------------
Andy Elliott, CL:480-695-9568
N601GE/Z601XL/TD/Corvair
540 hrs since 11/08
<http://servi-aero.com/n601ge/4sale/> Web Site Link
Message 7
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| Subject: | Re: Speaking of physics . . . |
At 06:17 PM 12/13/2013, you wrote:
>Bob,
>
>Your cursory and simplified analysis of the dynamics of switch
>vibration neither has sufficient data nor analysis to draw any
>conclusions. (I don't think you intended it to) Therefore it neither
>confirms nor refutes the suggestion that sliders are used because
>they handle vibration better in RC applications.
Okay, what is the counter-argument for
the effects of vibration in the system of levers
and masses? What are the forcing functions that
would separate a pair of toggle switch contacts
undergoing vibration?
If I am in error, nobody is more interested in
knowing than me . . . Prof Lewin once offered the
idea that bad teaching is a form of criminal behavior.
It's a matter of personal satisfaction and moral
imperative that a teacher strive for the best.
>Let's talk about "..loose items ..":
>
>I know you are not saying that the idea of "..loose items in the
>cockpit.." is impossible. In other words, I believe we agree that it
>is possible for foreign objects to get stuck in bad
>places. However, you seem to be rather dismissive of the ideas I
>have put forward. The crux of your argument seems to be based on
>the likelihood of a particular bad event.
Not at all. The outcome of damage to multiple
wires by burning due to electrical fault was
founded on the notion that some loose, conductive
item could become lodged between source and
ground with conductivity that would burn
a bus feeder. All the metal pens I've seen
were light, thin walled and poor conductors.
Walking up to a bus bar with malicious intent
armed with a metallic writing instrument is like
bringing a cork gun to a gunfight. Yes, there's
going to be sparks, smoke, heat and probably burned
fingers with little or no damage to the bus
or its feeder.
The fact that such feeders tend to "eat holes"
in their antagonists with little or no risk to
the feeder or functions that it energizes is the
foundation for policies articulated in the FARS
and decades-old industry practice for over a
quarter million light aircraft produced in this
country alone.
>Therein lies the problem - how to derive the likelihood. I suppose
>one could scour NTSB accident records to search for incidents of bad
>thing X happening. (But that requires a larger amount of effort
>than most of us are willing or able to put forth. There are other
>considerations in doing research of this nature - suffice it to say
>it is not a trivial task)
. . . and based on my experience, analysis and observations
I'll suggest that you will not find such an event in
the NTSB records . . .
I have oft repeated the observation that only an
exceedingly small number of accidents have electrical
systems malfunctions as proximate cause . . . and
of those cases, another small fraction are based
on failure to perform to design goals. When electrics
fail to perform, it nearly always finds foundation in human
errors of installation or maintenance.
>Therefore, in the absence of a probability for an event that is
>perhaps unlikely but not impossible, I offer the following idea:
>
>If there is a simple, easy, & cheap prophylactic action that can be
>taken to prevent something bad, even if the bad thing is
>statistically remote (or the statistics are unknown), then why not
>take that action?
As you wish . . . but how far do you carry this
line of reasoning? Would it be a good idea to
build a cage around the prop . . . a guard on a
fuel selector valve to guard against accidentally
kicking it? How about warning lights on the fuel
filler caps to warn of poor sealing (had these
critters siphon gas on an A36 . . . TWICE!)
>The "why not" question is important because even seemingly benign
>solutions have pros & cons and we certainly don't want the cure to
>be worse than the disease. I ask that "why not..." question a lot
>and lately have been getting less than satisfying answers.
I sincerely strive for my answers to be founded
in the simple-ideas of physics and practical
limits for guarding against the unanticipated
based on lessons learned.
The first time I saw this image was probably 35
years ago . . . and rather humorous at the time . .
http://healthyworker.files.wordpress.com/2013/01/osha_cowboy.jpg
It's interesting to contemplate what the "Engineer/
mechanic/pilot after FAA" would be decked out.
Over 35+ years, the work product of those with
profitable careers in worrying-on-our-behalf-for-
the-greater-good have offered a constellation of mandates
to address a host of 'why not?' . . . with little
if any observable change in accident rates or causation
for those accidents.
If you find satisfaction in guarding the bus bars
on your breaker panels or fusing the feeder, please
do so. It would upset nobody that I'm aware of. Your
airplane be fabricated to meet your design goals.
I am sorry to have failed your expectations for receiving
'satisfying answers'. All I can do is offer the best
I know now to do founded on a knowledge-base built on
my teachers, experiences, recipes for success . . .
combined with observations on experiences of others.
Bob . . .
Message 8
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This is pretty funny, Dr. Andy. The most prolific thing I saw in the physics department
at my college was written on one of the rest room stalls: "Is Max Planck's
Constant?"
Henador Titzoff
--------------------------------------------
On Sat, 12/14/13, Dr. Andrew Elliott <a.s.elliott@cox.net> wrote:
Subject: AeroElectric-List: Re: Physics...
To: aeroelectric-list@matronics.com
Date: Saturday, December 14, 2013, 1:44 PM
I sometimes
recall, from my long-ago days at MIT, the tongue-in-cheek
last question on the final exam from 8.03 third
semester Physics:
Given:
f=ma
e=mc
Maxwells equations
Derive:
Everything
Andy------------------------Andy Elliott, CL:480-695-9568 N601GE/Z601XL/TD/Corvair540
hrs since 11/08Web Site Link
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| Subject: | for physics lovers -- physics carols -- not aircraft |
related
http://www.haverford.edu/physics/songs/carols/carols.htm
Message 10
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| Subject: | Re: Speaking of physics . . . |
If there is a simple, easy, & cheap prophylactic action that can be
taken to prevent something bad, even if the bad thing is statistically
remote (or the statistics are unknown), then why not take that action?
The "why not" question is important because even seemingly benign
solutions have pros & cons and we certainly don't want the cure to be
worse than the disease. I ask that "why not..." question a lot and
lately have been getting less than satisfying answers.
-Jeff
Sounds like you are not feeling very Lucky! ?
Roger
Do not archive
Message 11
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| Subject: | Re: Speaking of physics . . . |
OK...so a robot walks into a bar, hops on a stool, and turns to the guy next to
him..."So whazz' happenen man?..."
And the guys goes into a long rant about his troubles w/ his self-centered sweetie...
The robot responds, "Man...I know just how you feel...I tried to have a relationship
with a MacBook...just couldn't make it work...all I ever got was 'iThis',
'iThat', 'iThis', 'iThat'..."
do not archive
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