AeroElectric-List Digest Archive

Wed 09/07/05


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 06:24 AM - Re: Reference documents reorganization (Eric M. Jones)
     2. 11:01 AM - Re: Re: Reference documents reorganization (Robert L. Nuckolls, III)
     3. 11:35 AM - Noise Filter for 5 lead motor (revenson@comcast.net)
     4. 01:25 PM - Re: Noise Filter for 5 lead motor (Robert L. Nuckolls, III)
     5. 03:17 PM - Question for Robert N. (Scott Derrick)
     6. 05:28 PM - Re: Question for Robert N. (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 06:24:19 AM PST US
    From: "Eric M. Jones" <emjones@charter.net>
    Subject: Re: Reference documents reorganization
    --> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" nuckollsr@cox.net >>snip... If anyone had told me 10 years ago that I would be trying to put my arms around 150 Meg of data with only about half the planned works still unposted, I would have found it difficult to believe.....<<snip And had anyone told me I could keep a gigabyte in my Swiss army knife......... http://www.swissknifewarehouse.com/viswusbmekn.html Jeezzzz............. do not archive Regards, Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge MA 01550-2705 (508) 764-2072 "Hey, it ain't rocket surgery!" --anonymous


    Message 2


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    Time: 11:01:04 AM PST US
    From: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
    Subject: Re: Reference documents reorganization
    --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net> At 09:22 AM 9/7/2005 -0400, you wrote: >--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net> > >--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" >nuckollsr@cox.net > > >>snip... If anyone had told me 10 years ago that I > would be trying to put my arms around 150 Meg of data with > only about half the planned works still unposted, I would > have found it difficult to believe.....<<snip > >And had anyone told me I could keep a gigabyte in my Swiss army >knife......... > >http://www.swissknifewarehouse.com/viswusbmekn.html > > >Jeezzzz............. > >do not archive ain't 'lectronics wunderful? I've got a guy working on protocols to use these "pendrives" as removable storage for a line of data acquisition systems I'm working. The goal is to have my hardware write a comma delimited, Windows readable file directly to the memory module so we can import directly to a variety of spread-sheet, analysis and graphing programs. Just 5 years ago, the only way we had to practically store that kind of data on board the flight test aircraft was with a portable digital tape recorder at 1000x the weight and 200x the price. Bob . . .


    Message 3


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    Time: 11:35:08 AM PST US
    From: revenson@comcast.net
    Subject: Noise Filter for 5 lead motor
    1.53 RCVD_NUMERIC_HELO Received: contains an IP address used for HELO --> AeroElectric-List message posted by: revenson@comcast.net I've got a 12VDC heater fan motor I'd like to quiet down at the source. I read Bob's document on Radio Shack inductor/capacitor noise filters and appreciate the simple, clear hookup diagrams. But in addition to a power lead and a ground, this motor also has three additional leads, one each for low, medium, and high speeds that go to the switch. Would it do any good to use a filter on the 12v and ground leads yet ignore the speed control wires? Roger. Also, Radio Shack has discontinued the 270-055 and 270-051 noise filters. I've got a 12VDC heater fan motor I'd like to quiet down at the source. I read Bob's document on Radio Shack inductor/capacitor noise filters and appreciate the simple, clear hookup diagrams. But in addition to a power lead and a ground, this motoralso has three additional leads, one each for low, medium, and high speeds that go to theswitch. Would it do any good to use a filter on the 12v and ground leads yet ignore the speed control wires? Roger. Also,Radio Shack has discontinued the 270-055 and 270-051 noise filters.


    Message 4


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    Time: 01:25:10 PM PST US
    From: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
    Subject: Re: Noise Filter for 5 lead motor
    --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net> At 06:34 PM 9/7/2005 +0000, you wrote: >--> AeroElectric-List message posted by: revenson@comcast.net > >I've got a 12VDC heater fan motor I'd like to quiet down at the source. >I read Bob's document on Radio Shack inductor/capacitor noise filters and >appreciate the simple, clear hookup diagrams. But in addition to a power >lead and a ground, this motor also has three additional leads, one each >for low, medium, and high speeds that go to the switch. >Would it do any good to use a filter on the 12v and ground leads yet >ignore the speed control wires? First, have you run this motor and confirmed that you truly need a filter? Given that there are 3 speed control leads in addition to a power lead, I'm thinking that the control leads do not represent a high noise risk. >Roger. >Also, Radio Shack has discontinued the 270-055 and 270-051 noise filters. Fooey. You can purchase component inductors from folks like Jameco. Go to Jameco.com and search on Inductors, Toroid You can assemble the inductors and capacitors into equivalents of the Radio Shack parts. Packaging is always the hassle. If you truly need a filter, I'd try a capacitor first. Something on the order of 1000 uF per Amp of motor current draw. See http://dkc3.digikey.com/PDF/T053/0977.pdf Bob . . .


    Message 5


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    Time: 03:17:42 PM PST US
    Subject: Question for Robert N.
    From: "Scott Derrick" <scott@tnstaafl.net>
    --> AeroElectric-List message posted by: "Scott Derrick" <scott@tnstaafl.net> Robert, Hows your feeling about using 1/2" copper oil lines from my engine to the nose cooler as a ground return? Scott


    Message 6


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    Time: 05:28:55 PM PST US
    From: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
    Subject: Re: Question for Robert N.
    --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net> At 06:16 PM 9/7/2005 -0400, you wrote: >--> AeroElectric-List message posted by: "Scott Derrick" <scott@tnstaafl.net> > >Robert, > >Hows your feeling about using 1/2" copper oil lines from my engine to the >nose cooler as a ground return? It's not a "new" idea. I had some long-ez builders using an aluminum vacuum line as a ground return about 15 years ago. It would be interesting to see how many are still flying with that arrangement and what prompted any changes. I think the risks are low IF integrity of the electrical connections are high. This means sweat soldered, large area joints that would assure both mechanical and electrical integrity of the conduit. The drawing at http://www.aeroelectric.com/Pictures//Conduit_Gnd.pdf illustrates some techniques suggested for getting high currents onto and off of a copper conduit ground system. Similar techniques would apply whether you ran wires or hot oil down the conduit. Of course, the run of copper between electrical connections would have to be similarly robust in terms of fluid tightness and electrical integrity. Standard copper tube fittings sweat soldered together should do the job. There are probably a trainload of prohibitions with foundations running the gammut of regulatory mandates to sky-is-falling hysteria. But if you can bolt a wing on correctly, one should be able to build a run of copper that has similar integrity for electrons and hydrocarbons. Bob . . .




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