AeroElectric-List Digest Archive

Thu 04/10/08


Total Messages Posted: 12



Today's Message Index:
----------------------
 
     1. 05:32 AM - Re: Securing Ends of Wires in Wing for Later Use (Speedy11@aol.com)
     2. 07:02 AM - Re: Securing Ends of Wires in Wing for Later Use (messydeer)
     3. 07:21 AM - Re: Strippers are all spoken for. (Peter Laurence)
     4. 07:34 AM - Re: Re: Securing Ends of Wires in Wing for Later Use (Robert Feldtman)
     5. 08:23 AM - Shunts (Dave VanLanen)
     6. 08:50 AM - Re: Shunts (Dan Brown)
     7. 09:32 AM - Re: Shunts (Matt Prather)
     8. 09:33 AM - Re: Shunts (Matt Prather)
     9. 09:51 AM - Re: Gilcrhist Electric (Robert L. Nuckolls, III)
    10. 11:43 AM - Re: Re: Gilcrhist Electric (John and Nancy Ghertner)
    11. 01:00 PM - Copper foil for ground planes (Robert L. Nuckolls, III)
    12. 07:47 PM - Splicing Shielded Cable (r falstad)
 
 
 


Message 1


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    Time: 05:32:49 AM PST US
    From: Speedy11@aol.com
    Subject: Re: Securing Ends of Wires in Wing for Later Use
    Dan, Consider doing as Roger suggested and instead of running the wires, run a pull line through the conduit to use later to pull the wires through. Also, you can use a file to make a nice, smoothed edge hole in the conduit. You can partially see what I've done at _http://www.rv-8a.net/2006.htm_ (http://www.rv-8a.net/2006.htm) and scroll down to 8 Apr 06 and 14 Apr 06. You can see the conduit in those photos and how I fed lines into them. Regards, Stan Sutterfield Dan, I ran a piece of 3/4-inch OD, 5/8 ID polyethylene tube the length of my wings so I can pull the wires when they are needed. That begs the question of a heated pitot. I figure that if I REALLY need a heated pitot, I can use a soldering iron through an access port to melt a hole in the conduit. Roger Cole Murphy Elite #709 Wings and tail done; starting fuselage On Apr 9, 2008, at 6:32 PM, messydeer wrote: > <messydeer@yahoo.com> > > Hello! > > I have one wing ready to skin and have run a bundle of wires from > the root out to the tip through the leading edge. The wire may be > used for a heated pitot tube (~3' from the root), landing lights > (~1' in from the tip), and a tip nav/pos/strobe combo. I will most > likely not install the lights and heated pitot until after hours of > flying, if at all. So, what are some good ways to tie off wire that > won't be used? > > The first wire I need to figure out is the one for a heated pitot. > My bundle goes through the forward of two lightening hole and the > pitot tube is located several inches back near the main spar. If I > make a few loops of pitot wire and tie it to the bundle, I wouldn't > be able to reach it through the access hole, which is only 2". So > I'm thinking it should be real close to the access hole, maybe even > on the pitot tube assembly itself? Again, it's not a heated tube > but would be available if I switched it over to one in the future. > > Then there are the rest of the wires that end at or near the tip. > For now I've coiled them a few times and cinched down a cable tie > or two there for the time being. I'm not in a hurry to get this > location figured out, because I'll have access to it after the wing > is skinned. But the pitot tube wire needs to be figured out in the > next few days. > > Cheers, > Dan (http://travel.aol.com/travel-guide/united-states?ncid=aoltrv00030000000016)


    Message 2


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    Time: 07:02:12 AM PST US
    Subject: Re: Securing Ends of Wires in Wing for Later Use
    From: "messydeer" <messydeer@yahoo.com>
    Thanks for the replies, guys. I've already got the wires routed without tubing. What it really comes down to is how to secure the loose spare wires at their ends before they are hooked up. With a tube this wouldn't be a problem. I suppose I could wrap and tape the heater wire around the non-heated pitot tube. -------- Dan Read this topic online here: http://forums.matronics.com/viewtopic.php?p=175906#175906


    Message 3


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    Time: 07:21:48 AM PST US
    From: "Peter Laurence" <PLaurence@the-beach.net>
    Subject: Strippers are all spoken for.
    -----Original Message----- Bob and listers. Gilchrist Electric's phone numbers have been disconnected. Out of Business? They clipped me for 14.00$. Payed through Google checkout. Can't seem to get anyone to answer my inquiry at Gilchrist and Google. Caveat Emptor Peter Laurence.


    Message 4


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    Time: 07:34:09 AM PST US
    From: "Robert Feldtman" <bobf@feldtman.com>
    Subject: Re: Securing Ends of Wires in Wing for Later Use
    I'd cut it off fold it on itself, stuff it in some heat wrap and heat shrink the wrap on it. That should hold it and eliminate the messiness of electrical tape "goo" bobf On 4/10/08, messydeer <messydeer@yahoo.com> wrote: > > > Thanks for the replies, guys. > > I've already got the wires routed without tubing. What it really comes > down to is how to secure the loose spare wires at their ends before they are > hooked up. With a tube this wouldn't be a problem. I suppose I could wrap > and tape the heater wire around the non-heated pitot tube. > > -------- > Dan > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=175906#175906 > >


    Message 5


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    Time: 08:23:03 AM PST US
    From: "Dave VanLanen" <davevanlanen@sbcglobal.net>
    Subject: Shunts
    I am reading through the AeroElectric Connection manual as I have time, but I am having trouble comprehending some of the concepts presented. I just read about the use of shunts in an electrical system to allow the measurement of large currents with small meters. One thing I don't understand is, if a shunt is used in the circuit to be measured, what prevents a reduction in energy in the circuit on the downstream side of the shunt? Can someone help me better understand this? Thanks, Dave Van Lanen 601XL - Tail


    Message 6


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    Time: 08:50:45 AM PST US
    From: Dan Brown <dan@familybrown.org>
    Subject: Re: Shunts
    Quoting Dave VanLanen <davevanlanen@sbcglobal.net>: > understand is, if a shunt is used in the circuit to be measured, what > prevents a reduction in energy in the circuit on the downstream side of the > shunt? Can someone help me better understand this? Nothing prevents it; there is in fact such a reduction. However, it's such a minuscule reduction that it's not noticeable in ordinary operation. A shunt typically is designed for a 50 mV voltage drop at full capacity. So, a 100A shunt will cause a 50 mV drop at 100A. In a 14V circuit, 100A represents 1400W, and the shunt will consume 5W of that. -- Dan Brown, KE6MKS, dan@familybrown.org "Since all the world is but a story, it were well for thee to buy the more enduring story rather than the story that is less enduring." -- The Judgment of St. Colum Cille


    Message 7


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    Time: 09:32:35 AM PST US
    Subject: Re: Shunts
    From: "Matt Prather" <mprather@spro.net>
    Hey Dave, Nothing prevents loss of energy downstream of the shunt. But, a properly selected shunt will have a relatively small voltage drop at full scale current - reducing the power consumption of the device. Typical shunts drop 50mV at full scale. On a 100A peak current circuit that's 5W = 100A * 50mV. If you figure you're dropping the rest of the 13V supply into the 100A load, you're only losing 5W out of 1300W or 0.3%. Not too terrible. At lower currents the percentage of power lost is less: 10A through the same shunt will drop 5mV which is 50mW of the 130W delivered to the load - or 0.03%. Many aircraft engine monitors are setup to use Hall Effect sensors - which do not consume any current from the measured circuit. Regards, Matt- > I am reading through the AeroElectric Connection manual as I have time, > but > I am having trouble comprehending some of the concepts presented. I just > read about the use of shunts in an electrical system to allow the > measurement of large currents with small meters. One thing I don't > understand is, if a shunt is used in the circuit to be measured, what > prevents a reduction in energy in the circuit on the downstream side of > the > shunt? Can someone help me better understand this? > > Thanks, > Dave Van Lanen > 601XL - Tail >


    Message 8


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    Time: 09:33:12 AM PST US
    Subject: Re: Shunts
    From: "Matt Prather" <mprather@spro.net>
    Hey Dan That's funny.. We used much of the same verbiage. Even most of the same example. Matt- do not archive > > Quoting Dave VanLanen <davevanlanen@sbcglobal.net>: > >> understand is, if a shunt is used in the circuit to be measured, what >> prevents a reduction in energy in the circuit on the downstream side of >> the >> shunt? Can someone help me better understand this? > > Nothing prevents it; there is in fact such a reduction. However, it's > such a minuscule reduction that it's not noticeable in ordinary > operation. A shunt typically is designed for a 50 mV voltage drop at > full capacity. So, a 100A shunt will cause a 50 mV drop at 100A. In > a 14V circuit, 100A represents 1400W, and the shunt will consume 5W of > that. > > -- > Dan Brown, KE6MKS, dan@familybrown.org > "Since all the world is but a story, it were well for thee to buy the > more enduring story rather than the story that is less enduring." > -- The Judgment of St. Colum Cille > >


    Message 9


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    Time: 09:51:54 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@cox.net>
    Subject: RE: Gilcrhist Electric
    At 10:18 AM 4/10/2008 -0400, you wrote: ><PLaurence@the-beach.net> > > >-----Original Message----- >Bob and listers. > >Gilchrist Electric's phone numbers have been disconnected. Out of Business? >They clipped me for 14.00$. > >Payed through Google checkout. Can't seem to get anyone to answer my inquiry >at Gilchrist and Google. This has been reported to me by several builders. I've written the Chamber of Commerce in Bozeman and searched the 'net for any indication that the company has folded. No data has been forthcoming as of this writing. Gilchrist has also completely disappeared from Ebay in spite of the fact that their website is still up . . . and silent as to the fortunes of the company. I'm sorry to hear this. They gave me very good prices on lots of coax strippers during the time I was offering them from our website. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ----------------------------------------


    Message 10


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    Time: 11:43:47 AM PST US
    From: John and Nancy Ghertner <nghertner@verizon.net>
    Subject: Re: RE: Gilcrhist Electric
    I received a stripper from them today. Unfortunately, it is the wrong size. Lory Ghertner > <nuckolls.bob@cox.net> > > At 10:18 AM 4/10/2008 -0400, you wrote: > >> <PLaurence@the-beach.net> >> >> >> >> -----Original Message----- >> Bob and listers. >> >> Gilchrist Electric's phone numbers have been disconnected. Out of Business? >> They clipped me for 14.00$. >> >> Payed through Google checkout. Can't seem to get anyone to answer my inquiry >> at Gilchrist and Google. > > This has been reported to me by several builders. I've written the > Chamber of Commerce in Bozeman and searched the 'net for any > indication that the company has folded. No data has been > forthcoming as of this writing. Gilchrist has also completely > disappeared from Ebay in spite of the fact that their website > is still up . . . and silent as to the fortunes of the company. > > I'm sorry to hear this. They gave me very good prices on > lots of coax strippers during the time I was offering > them from our website. > > Bob . . . > > ----------------------------------------) > ( . . . a long habit of not thinking ) > ( a thing wrong, gives it a superficial ) > ( appearance of being right . . . ) > ( ) > ( -Thomas Paine 1776- ) > ---------------------------------------- > > > > > >


    Message 11


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    Time: 01:00:20 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@cox.net>
    Subject: Copper foil for ground planes
    I just ran across this offering on the 'net for .013" thick copper sheet. http://www.craftsetc.com/store/item.aspx?ItemId=37793&dep=50&cat=85&subcat=25&Search=Y This stuff is thick enough to craft mechanically robust ground plane radials for antennas on plastic airplanes. In fact, one could also craft the center commoning disk from two pieces of the same material. Sandwich and sweat solder the radials between the commoning sheets. I've crafted several DIY com antennas with featuring coax connectors. I'm satisfied with the last iteration and will be publishing a comic book on it in the not too distant future. Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ----------------------------------------


    Message 12


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    Time: 07:47:36 PM PST US
    From: "r falstad" <bobair8@msn.com>
    Subject: Splicing Shielded Cable
    Folks, I'm using the Ray Allen electric trim and their stick grips in my GlaStar. I'm using shielded two-conductor cable from the PTT switch to the intercom. I need to splice that cable and originally used Bob's soldered lap splicing technique but kept the exposed wires very short to be able to replace the shield. Long story short -- one of the wires shorted to the shield so I had a "stuck mic". My specific question is: what's the best way to replace the shield after splicing shielded wire? To do it right this time, I'll have to expose about 2" - 3" of each wire. Best regards, Bob GlaStar N248BF




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