AeroElectric-List Digest Archive

Fri 12/13/13


Total Messages Posted: 8



Today's Message Index:
----------------------
 
     1. 05:53 AM - Re: Speaking of physics . . . (Eric M. Jones)
     2. 09:53 AM - Re: Re: Speaking of physics . . . (Robert L. Nuckolls, III)
     3. 10:12 AM - Re: Speaking of physics . . . (Robert L. Nuckolls, III)
     4. 10:22 AM - Re: Speaking of physics . . . (jan)
     5. 01:44 PM - Re: IVO Prop current limiter (Robert L. Nuckolls, III)
     6. 04:19 PM - Re: Speaking of physics . . . (Jeff Luckey)
     7. 04:59 PM - Re: Speaking of physics . . . (Richard Girard)
     8. 08:47 PM - Strobe Noise (Jared Yates)
 
 
 


Message 1


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    Time: 05:53:37 AM PST US
    Subject: Re: Speaking of physics . . .
    From: "Eric M. Jones" <emjones@charter.net>
    Bob, et al.--- Walter Lewin is great stuff! _____________________ I posted: Thu Sep 12, 2013 9:31 am Off Topic: When you think you understand electronics, see Google: " You Tube M I T Walter Lewin Complete Breakdown of Intuition Part 1 " If you are really brave see Part 2. _____________________ Also, any You Tube re: Richard Feynman. Merry Xmas -------- 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=415494#415494


    Message 2


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    Time: 09:53:55 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Speaking of physics . . .
    At 07:52 AM 12/13/2013, you wrote: > >Bob, et al.--- Walter Lewin is great stuff! Yeah, he's one of my heros. Bob . . .


    Message 3


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    Time: 10:12:56 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Speaking of physics . . .
    At 05:26 PM 12/12/2013, you wrote: > >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 simple-ideas in physics. Bob . . .


    Message 4


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    Time: 10:22:12 AM PST US
    From: jan <jan@CLAVER.DEMON.CO.UK>
    Subject: Speaking of physics . . .
    Amen to that !!! :-) Jan Do not archive -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: 13 December 2013 18:12 Subject: Re: AeroElectric-List: Speaking of physics . . . <nuckolls.bob@aeroelectric.com> At 05:26 PM 12/12/2013, you wrote: > >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 simple-ideas in physics. Bob . . .


    Message 5


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    Time: 01:44:06 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: IVO Prop current limiter
    At 03:51 AM 12/13/2013, you wrote: >Hi Bob, > >I stumbled on the IVO Prop current limiter schema searching... an >IVO Prop protection device to avoid problems with it :-) > >I have an ICP Savannah VG running a 912 wit an IVO ultralight 3blade IFA. > >Looking on the forum I saw a lot of message, some very positive, >some a little less. At the end I did not understood what is the >current status of the project. I did that design a number of years ago and several List members endeavored to build it . . . as I recall, their results met design goals. If anyone has encountered difficulties, I wasn't aware of it but I'd sure like to be. >Is it OK? Any (possible) and unresolved issue? (I can build it by >myself, no problem for this). > >Would you be so kind to update ma about this? I considered making it a product. In fact, I think I have some proof-of concept ECBs around here somewhere. The thing would fit into this package except it wouldn't be labeled 'solid state relay' http://tinyurl.com/kw3h453 >Best regards and... Merry Christmas! :-) Thank you sir . . . you too. I've echoed this to the List and with an invitation to anyone with good or bad experiences with this circuit http://tinyurl.com/pf5w9s2 to jump in and update us on their findings. If the circuit needs modification, that can be accomplished. As I said, I think I do have some boards to assemble one . . . if the project looks like it should move forward, perhaps your airplane could be the 'beta test' environment. Bob . . .


    Message 6


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    Time: 04:19:03 PM PST US
    From: Jeff Luckey <jluckey@pacbell.net>
    Subject: Re: Speaking of physics . . .
    Bob,=0A=0AYour cursory and simplified analysis of the dynamics of switch vi bration 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.=0A=0ALet's talk about "..loose items ..":=0A=0AI know y ou are not saying that the idea of "..loose items in the cockpit.." is impo ssible. 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 dismi ssive of the ideas I have put forward.-- The crux of your argument seem s to be based on the likelihood of a particular bad event.=0A=0ATherein lie s the problem - how to derive the likelihood. I suppose one could =0Ascour NTSB accident records to search for incidents of bad =0Athing X happening. - (But that requires a larger =0Aamount of effort than most of us are wil ling 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)=0A=0ATherefor e, in the absence of a probability for an event that is perhaps unlikely bu t not impossible, I offer the following idea: - - - - - - =0A =0AIf there is a simple, easy, & cheap prophylactic action that can be take n to prevent something bad, even if the bad thing is statistically remote ( or the statistics are unknown), then why not take that action?=0A=0AThe "wh y not" question is important because even seemingly benign solutions have p ros & cons and we certainly don't want the cure to be worse than the diseas e.- I ask that "why not..." question a lot and lately have been getting l ess than satisfying answers.=0A=0A-Jeff=0A=0A=0A=0A=0A_____________________ ___________=0A From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.c om>=0ATo: aeroelectric-list@matronics.com =0ASent: Friday, December 13, 201 3 10:12 AM=0ASubject: Re: AeroElectric-List: Speaking of physics . . .=0A uckolls.bob@aeroelectric.com>=0A=0AAt 05:26 PM 12/12/2013, you wrote:=0A> - i Bob=0A> Any particular one which is relevant to aero electrics? There are 567 hits for Walter Lewin lectures on the site...=0A> Sacha=0A=0A- ALL are relevant.=0A=0A- EVERY discipline reduced to the most fundamental=0A - components will invariably illustrate principals=0A- of motion, for ce, friction, dissipation of energy,=0A- radiation, behaviors of materia ls, etc. etc.=0A=0A- I invoked a sampling of these ideas in our consider ation=0A- of risk for "loose items in cockpit" causing near=0A- catas trophic events and a consideration of likelihood=0A- that a slide switch is more resistant to vibration than=0A- a toggle switch.=0A=0A- A gr eat deal of what passes for considered decision=0A- making is based on c onclusions unsupported by the simple-ideas=0A- in physics. Much of what I did during my last years=0A- at Beech was to discover the constellatio n of operating=0A- simple-ideas responsible for failure to perform . . . =0A- troubleshooting down to the lowest common denominator.=0A=0A- A solid grounding in physics is the cornerstone=0A- of virtually every oth er discipline . . . the whole=0A- universe and every system within runs =====


    Message 7


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    Time: 04:59:18 PM PST US
    Subject: Re: Speaking of physics . . .
    From: Richard Girard <aslsa.rng@gmail.com>
    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> 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> > *To:* aeroelectric-list@matronics.com > *Sent:* Friday, December 13, 2013 10:12 AM > > *Subject:* Re: AeroElectric-List: Speaking of physics . . . > > nuckolls.bob@aeroelectric.com> > > At 05:26 PM 12/12/2013, you wrote: > > > > 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/"> > www.aeroelectric.comwww.mypilotstList Contribution Web > -========================= > > > <http://www.mypilotstore.com/> > > * > > * > > -- Zulu Delta Mk IIIC Thanks, Homer GBYM It isn't necessary to have relatives in Kansas City in order to be unhappy. - Groucho Marx


    Message 8


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    Time: 08:47:11 PM PST US
    Subject: Strobe Noise
    From: Jared Yates <email@jaredyates.com>
    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" of 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.




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