AeroElectric-List Digest Archive

Sat 07/21/18


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 12:47 PM - Re: MANL's (current limiters) (Robert L. Nuckolls, III)
     2. 01:03 PM - Re: Re: Cost effective technology (Robert L. Nuckolls, III)
     3. 02:30 PM - Education is EXPENSIVE but information is FREE (Robert L. Nuckolls, III)
     4. 04:45 PM - Re: Education is EXPENSIVE but information is FREE (Eric Page)
     5. 06:10 PM - Re: Re: Education is EXPENSIVE but information is FREE (Robert L. Nuckolls, III)
     6. 08:27 PM - aeroflash strobe repair (C&K)
 
 
 


Message 1


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    Time: 12:47:31 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: MANL's (current limiters)
    At 10:38 PM 7/20/2018, you wrote: > >Are MANL standard size, standard specs other than Amp rating? I >have one and would like to have one or two on hand, but really don't >know how to source without some sort of spec -- Thanks! > >P.S. 'Lectric Bob if you read this, I am trying to match the one I >received from you in the care package recently. How do I spec it >othe than Amps? > The MANL series of limiters are commercial-off-the-shelf products. They are made by virtually every top tier line of suppliers but with different part/model numbers. Here's a MIDI spec sheet from Littlefuse . . . https://goo.gl/hiUBir Bottom line is that unlike 'fuses' that are more carefully crafted for thermal dynamics, these critters are more like "fusible links" . . . they are expected to clear hard faults (hundreds to thousands of amps of fault current). For our purposes, anything you can find with an appropriate rating and 30MM hole spacing will do fine. Most automotive applications call for really fat rascals . . . 60 amps or more. So Smiley Jack's Car Parts Emporium is problematic, try these. https://goo.gl/dXkrH4 Bob . . .


    Message 2


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    Time: 01:03:56 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Cost effective technology
    At 10:08 PM 7/20/2018, you wrote: Great discussion and certainly worth consideration of the points alluded to here and specifically mentioned on the VAF forum thread. I do believe if I ever built another EAB airframe, I would be up to the challenge of doing the wiring to cover my systems and intended usage with way more insight than what I had prior to this first project. Ohhh that we were born with hindsight . . . but not all is lost. Your project is not 'crippled' or even less 'safe' . . . you are 100x more likely to experience a bad day in the cockpit for reasons OTHER than having made a less than elegant design decision on the electrics. For now, my system is what it is, and the aircraft will be operated with consideration for the fault/failure potential. The risk I accept can be somewhat mitigated through thorough and particular attention to maintenance, favorable flight conditions, conservative operational usage and pilot training/proficiency. Eventually, I may even retrofit this airframe with a different engine and/or panel which would allow me to redesign the electrical system as well. There you go! The understanding garnered from these discussions will do more for reduction of risk than all the advice in the world . . . advice can be contradictory, mis-applied and/or just plain wrong. Understanding is what lets you sift the sands of the whole and save back the nuggets of knowledge that keep the wheels on your wagon (or should I say wings on your airplane?). I'm recalling some discussions we had here on the list about some plug-n-play, gee-whizz boxes nearly 20 years ago . . . https://goo.gl/L1U42b https://goo.gl/bMJVeL There was a time that I was mulling over the notion of offering a po' boys version of that Cessna gee-whiz box I cited a few days ago . . . but after sifting through the options and identifying the ways my own path to electric Nirvana failed to cover the kinds of options addressed in the z-figures, I pitched the project. Bob . . .


    Message 3


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    Time: 02:30:38 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Education is EXPENSIVE but information is FREE
    Had a request for recommendation on a beginner's study text in electronics. Went on a netsearch for a copy of my favorite teaching texts . . . Electronics Fundamentals Circuits Devices and Applications 8th Edition By David M Buchla and Thomas L Floyd and stumbled onto this website: https://goo.gl/kJZ2Nf Not only did it offer a .pdf copy of what I was looking for . . . https://goo.gl/Jad7Zk . . . it seems that this repository offers a huge selection of technical reference and teaching texts. Check it out. I'm going to put a copy on my Kindle. It never hurts to review . . . Bob . . .


    Message 4


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    Time: 04:45:37 PM PST US
    Subject: Re: Education is EXPENSIVE but information is FREE
    From: "Eric Page" <edpav8r@yahoo.com>
    Excellent find, Bob! For anyone who wants electronics study material in an online format, check out these two sites: https://www.electronics-tutorials.ws/ https://www.allaboutcircuits.com/textbook/ Ive found both to be well-written and comprehensive. The second site also features a very active forum with a solid core of members who answer questions and offer help with all manner of projects. Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481794#481794


    Message 5


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    Time: 06:10:31 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Education is EXPENSIVE but information is
    FREE At 06:44 PM 7/21/2018, Eric Page wrote: > >Excellent find, Bob! For anyone who wants >electronics study material in an online format, check out these two sites: > >https://www.electronics-tutorials.ws/ > >https://www.allaboutcircuits.com/textbook/ > >I=99ve found both to be well-written and >comprehensive. The second site also features a >very active forum with a solid core of members >who answer questions and offer help with all manner of projects. > >Eric Thanks for those expansions. I'm a member but inactive on all about circuits . . . spent some time there in the past but there's only so much time I can devote to the keyboard . . . the List is where I concentrate my efforts now. But yes, all about circuits is a really good place to extend one's technical horizons! Bob . . .


    Message 6


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    Time: 08:27:47 PM PST US
    Subject: aeroflash strobe repair
    From: C&K <yellowduckduo@gmail.com>
    I just had another aeroflash 151-0011 strobe power supply fail. Interestingly it was the second one I've seen with an open 330K resistor that was preventing triggering. On 12 volts the unit would almost immediately charge up to 400 volts and then shutdown until the voltage decayed. On about 6 volts the unit would charge continuously to about 300 volts and you could hear the trigger fire but the signal was not getting to the white wire going to the flash tube. Across the 330K resistor measured about 450K in circuit and it was in fact open. It was the larger (1/2 watt) of the two 330K resistors that failed. Simple fix but of course the usual safety cautions of respecting high voltage and capacitors applies. Mine self discharged quickly but yours might not. Ken




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