AeroElectric-List Digest Archive

Thu 11/05/09


Total Messages Posted: 9



Today's Message Index:
----------------------
 
     0. 12:09 AM - Reminder (Matt Dralle)
     1. 06:10 AM - Re: Relays etc (gordonrsmith921@yahoo.com)
     2. 07:29 AM - Re: Re: Relays etc (Robert L. Nuckolls, III)
     3. 08:43 AM - Avionics cooling fan revisited (Eric Schlanser)
     4. 09:20 AM - Re: Avionics cooling fan revisited ()
     5. 01:41 PM - Re: p-lead signal conditioning or tach gen usage (Craig Winkelmann)
     6. 03:20 PM - Re: Re: p-lead signal conditioning or tach gen usage (Robert L. Nuckolls, III)
     7. 04:50 PM - Jabiru Magneto Wiring (messydeer)
     8. 04:57 PM - Re: Jabiru Magneto Wiring (messydeer)
 
 
 


Message 0


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    Time: 12:09:27 AM PST US
    From: Matt Dralle <dralle@matronics.com>
    Subject: Reminder
    Dear Listers, Just a quick reminder that November is the annual List Fund Raiser. The Matronics Lists are 100% member supported and all of the operational costs are provided for my your Contributions during this time of the year. Your personal Contribution makes a difference and keeps all of the Matronics Email Lists and Forums completely ad-free. Please make your Contribution today to keep these services up and running! http://www.matronics.com/contribution Thank you in advance! Matt Dralle Matronics Email List and Forum Administrator


    Message 1


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    Time: 06:10:34 AM PST US
    Subject: Re: Relays etc
    From: "gordonrsmith921@yahoo.com" <gordonrsmith921@yahoo.com>
    Bob wrote "That will let me spend 100% of my time on development of about a dozen new products. Here's the preliminary data on a solid state relay." Might one of these products be the small, light, low cost, wing leveler discussed as part of "The Right Stuff" and "The Weak Link" in July 2009? Gordon smith Read this topic online here: http://forums.matronics.com/viewtopic.php?p=271175#271175


    Message 2


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    Time: 07:29:53 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Relays etc
    At 08:08 AM 11/5/2009, you wrote: ><gordonrsmith921@yahoo.com> > >Bob wrote >"That will let me spend 100% of my time on development >of about a dozen new products. Here's the preliminary >data on a solid state relay." > >Might one of these products be the small, light, low cost, wing >leveler discussed as part of "The Right Stuff" and "The Weak Link" >in July 2009? That's on the list but necessarily rather far down. The up-front development $time$ is significant. The manufacture calls for a significant quantity of out- sourced materials. Further, there ARE already very capable suppliers of similar products on the market. A noteworthy supplier is "Mr. Autopilot" in the person of Jim Younkin. I could not pick a more worthy competitor. I'll need access to a flight test airframe too. I've considered buying or leasing something with a prop and wings on it for that purpose. In any case, I still think it's a righteous project with a lot of potential. I need to make sure that any investment WE make (my kids are being groomed to take over AEC business interests) has a high probability for return on investment. In the mean time . . . Bob . . . --------------------------------------- ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------


    Message 3


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    Time: 08:43:30 AM PST US
    From: Eric Schlanser <eschlanser@yahoo.com>
    Subject: Avionics cooling fan revisited
    -In researching the Aeroelectric-list archives for cooling fans, I-foun d several interesting posts. - -I-copied and pasted-the-post below-from 2003. When I followed- Bob's link to the fan at MPJA.com,-it was no longer there.-The one Bob recommended- (60 cfm and 2 amps)seems like too much when compared to TSO' d fans like the Cyclone-21 (21-cfm and 0.19 amp) or Ameriking (26-cfm -and-0.6 amp). If Bob is reading, what would you suggest today? - Is there a specific alternative fan that would be appropriate to cool the t wo radios in my OBAM plane besides the-T$O's fans made for certified plan es? Or how to house the suggested computer fans? Have such computer fans-been used successfully notwithstanding Bob's doub ts as to their suitability? - Thanks for the list, Eric Schlanser-- - - Match: #83 Message: #15485 Dec 08, 2003 From: "Robert L. Nuckolls, III" <bob.nuckolls(at)cox.net> Subject: Re: cooling fans, ONE DOLLAR > >There's been some talk about cooling fans, and people have mentioned 8-12 >bucks (I think).- No need to spend that much: > >$1 each:- http://store.yahoo.com/nexfan03/evcafan80bl.html > >Or, for quieter, ball bearing, $4.99 each: >http://store.yahoo.com/directron/uc001btc.html >http://store.yahoo.com/directron/80l1a.html -- Air movers for avionics need characteristics -- conducive to moving air against quite a bit -- of back pressure. The relatively small diameter -- hoses are probably too much for a computer cooling -- fan that almost never has to move air though -- tiny spaces. -- Most of the avionics cooling fans I've seen -- used centrifugal blowers or vane axial blowers. -- If I were going to hammer something together -- for avionics cooling, I'd start with a product -- like -- http://www.mpja.com/productview.asp?product=14495+FN -- This critter draws 2A and is rated at 60 cfm -- (at no pressure). You could build a plenum onto -- its output snoot for attaching cooling hoses. -- Bob . . . =0A=0A=0A


    Message 4


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    Time: 09:20:06 AM PST US
    Subject: Avionics cooling fan revisited
    From: <longg@pjm.com>
    Eric, I just perused the site and went to the fans directory. apparently technology is moving forward. there are a number of adaptable 12/24 volt blowers (look like leaf blowers) that draw < 1 amp and are reasonably priced too. You don't get much for a dollar today, but I saw some from $5-10. Glenn From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Eric Schlanser Sent: Thursday, November 05, 2009 11:41 AM Subject: AeroElectric-List: Avionics cooling fan revisited In researching the Aeroelectric-list archives for cooling fans, I found several interesting posts. I copied and pasted the post below from 2003. When I followed Bob's link to the fan at MPJA.com, it was no longer there. The one Bob recommended (60 cfm and 2 amps)seems like too much when compared to TSO'd fans like the Cyclone-21 (21 cfm and 0.19 amp) or Ameriking (26 cfm and 0.6 amp). If Bob is reading, what would you suggest today? Is there a specific alternative fan that would be appropriate to cool the two radios in my OBAM plane besides the T$O's fans made for certified planes? Or how to house the suggested computer fans? Have such computer fans been used successfully notwithstanding Bob's doubts as to their suitability? Thanks for the list, Eric Schlanser Match: #83 Message: #15485 Dec 08, 2003 From: "Robert L. Nuckolls, III" <bob.nuckolls(at)cox.net> Subject: Re: cooling fans, ONE DOLLAR <http://www.matronics.com/searching/getmsg_script.cgi?INDEX=24759583?KE Y S=cooling_fan?LISTNAME=AeroElectric?HITNUMBER=83?SERIAL=064059231 52?SHOW BUTTONS=NO> > >There's been some talk about cooling fans, and people have mentioned 8-12 >bucks (I think). No need to spend that much: > >$1 each: http://store.yahoo.com/nexfan03/evcafan80bl.html > >Or, for quieter, ball bearing, $4.99 each: >http://store.yahoo.com/directron/uc001btc.html >http://store.yahoo.com/directron/80l1a.html Air movers for avionics need characteristics conducive to moving air against quite a bit of back pressure. The relatively small diameter hoses are probably too much for a computer cooling fan that almost never has to move air though tiny spaces. Most of the avionics cooling fans I've seen used centrifugal blowers or vane axial blowers. If I were going to hammer something together for avionics cooling, I'd start with a product like http://www.mpja.com/productview.asp?product=14495+FN This critter draws 2A and is rated at 60 cfm (at no pressure). You could build a plenum onto its output snoot for attaching cooling hoses. Bob . . .


    Message 5


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    Time: 01:41:08 PM PST US
    Subject: Re: p-lead signal conditioning or tach gen usage
    From: "Craig Winkelmann" <capav8r@gmail.com>
    Bob: Here is the circuit that is the current interface between the tach gen and the EFIS tach input. It was originally designed to interface a Hall sensor with a 10 V p-p input. The 50K resistor in parallel with the zener was to provide a current path (so I am told) should a p-lead be used instead of the Hall sensor. My thought was to put the circuit you have proposed in the location as shown in the attached document (I could not scan to a .jpg and the .bmp was way too big). Thanks, Craig Read this topic online here: http://forums.matronics.com/viewtopic.php?p=271250#271250 Attachments: http://forums.matronics.com//files/tach_interface_146.doc


    Message 6


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    Time: 03:20:31 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: p-lead signal conditioning or tach gen usage
    At 03:38 PM 11/5/2009, you wrote: ><capav8r@gmail.com> > >Bob: > >Here is the circuit that is the current interface between the tach >gen and the EFIS tach input. It was originally designed to >interface a Hall sensor with a 10 V p-p input. The 50K resistor in >parallel with the zener was to provide a current path (so I am told) >should a p-lead be used instead of the Hall sensor. > >My thought was to put the circuit you have proposed in the location >as shown in the attached document (I could not scan to a .jpg and >the .bmp was way too big). Okay. I think your 'trash' is coming from artifacts on the wave-form that are a result of the combination of the two phases of a 3-phase generator. These seem to reside some millivolts away from ground . . . so your results are bound to improve if you move your comparator's decision-point as close to ground as possible. Try the simple transistor-zener circuit without the comparator. The transistor's "decision point" is in the .5 to .7 volt range as a function of Vbe characteristics of b-e junction. Bob . . . --------------------------------------- ( It's MATRONICS FUND RAISER MONTH! ) ( Do your part to keep this marvelous ) ( tool sharp and available to all our ) ( brothers in the OBAM aviation ) ( community. ) ---------------------------------------


    Message 7


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    Time: 04:50:43 PM PST US
    Subject: Jabiru Magneto Wiring
    From: "messydeer" <messydeer@yahoo.com>
    Hello! The Jabiru manual doesn't say much about the mag wiring. On each of my coils, there is a 1/4" faston tab. I have 20awg shielded wire for each ignition. I've read through the Book and understand when the mags are ungrounded, they are hot. Flipping the mag switch off completes the ground ground and kills the mag. I've attached a doc that shows what I understand and what I don't. Quotes are from Bob's book in Note 3 of the Z appendix, I believe: 1. "Attach the shield to one and only one switch terminal at the cockpit end..." How do I do this? I can strip off the outer insulation and expose the braided shield. For a 20awg wire, using a 16awg stripper is about right. That's about as far as my brain will take me. Seems like I would splice the outer braid to a wire, and connect that wire via faston to terminal #2 of the switch. Another faston would go on the inner wire and connect to terminal #3. I just don't know how. 2. "Attach the shield to engine ground at the magneto end." The drawing shows shield going to one spot on the ignition and the inner wire going to another. I have just the faston tab of the coil. How is this done? -------- Dan Read this topic online here: http://forums.matronics.com/viewtopic.php?p=271275#271275 Attachments: http://forums.matronics.com//files/dans_magneto_wiring_141.pdf


    Message 8


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    Time: 04:57:59 PM PST US
    Subject: Re: Jabiru Magneto Wiring
    From: "messydeer" <messydeer@yahoo.com>
    I also just read this searching through the Yahoo Jab group: "...at the switch end, you should connect both L and R shield grounds together (but not to anything else but the switch), for redundancy, in case of a break in one of the ground leads, you can still shut off the engine. This should not cause a ground loop/noise problem..." -------- Dan Read this topic online here: http://forums.matronics.com/viewtopic.php?p=271277#271277




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