AeroElectric-List Digest Archive

Sun 10/11/09


Total Messages Posted: 9



Today's Message Index:
----------------------
 
     1. 07:20 AM - Control Stick Switches =?ISO-8859-1?Q?=93?= Best Practice? (gordonrsmith921@yahoo.com)
     2. 07:21 AM - typo? (gordonrsmith921@yahoo.com)
     3. 09:19 AM - Re: typo? (Robert L. Nuckolls, III)
     4. 09:26 AM - Re: Control Stick Switches =?iso-8859-1?Q?=93?= Best Practice? (Robert L. Nuckolls, III)
     5. 03:20 PM - B & C Alternator cooling (Mick Muller)
     6. 05:55 PM - Re: B & C Alternator cooling (J. Mcculley)
     7. 06:18 PM - AEC Modules (gordonrsmith921@yahoo.com)
     8. 07:00 PM - Re: AEC Modules (Robert L. Nuckolls, III)
     9. 08:21 PM - Re: B & C Alternator cooling (peter laurence)
 
 
 


Message 1


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    Time: 07:20:34 AM PST US
    Subject: Control Stick Switches =?ISO-8859-1?Q?=93?= Best Practice?
    From: "gordonrsmith921@yahoo.com" <gordonrsmith921@yahoo.com>
    Given: RV A/C with airframe tied directly to battery ground (rear Batteries). I am planning the following switch functions on the control stick: Trim (4 way), Com PTT, Autopilot Control, and perhaps Com channel flip-flop and other functions. All of these functions require a momentary pull to low (ground) to activate/toggle a function. My original planning was to employ a single ground conductor up the stick to the switches. This ground conductor would be tied, locally, to A/C ground in the area of the stick. After reviewing various Z figures it appears that a better practice would be to bring the stick ground conductor to the Panel G3 (inside firewall) or the Avx G5 (back side of panel). Which is preferred? Is it proper to have a single ground conductor for all of the stick switch functions? Should the PTT be given special consideration and a separate ground path with perhaps both (to-from) paths shielded. PS Engineering schematics show PTT wiring only from the mic jack (PTT from the tip and low-ground from the barrel). Can the remote stick PTT be wired directly from the Intercom, connecting to the respective PTT mic pin and mic low connection at the Intercom? Should these conductors be shielded in this case? Perhaps the bottom line might be: 1. 1 ground conductor for trim relay decks going to local ground. 2. 1 ground conductor for PTT going to Intercom or mic jack. 3. 1 ground conductor for the other toggle functions to Avx G5. Overkill? Gordon Smith Read this topic online here: http://forums.matronics.com/viewtopic.php?p=267450#267450


    Message 2


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    Time: 07:21:28 AM PST US
    Subject: typo?
    From: "gordonrsmith921@yahoo.com" <gordonrsmith921@yahoo.com>
    Bob: Assuming that you wish for us listers to query any possible typos in your documents or figures: In Z15k2 grounding for Seaplane, is the diode between the Main Bus and Endurance Bus shown in a reversed orientation? Gordon Smith Read this topic online here: http://forums.matronics.com/viewtopic.php?p=267451#267451


    Message 3


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    Time: 09:19:02 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: typo?
    At 09:20 AM 10/11/2009, you wrote: >"gordonrsmith921@yahoo.com" <gordonrsmith921@yahoo.com> > >Bob: >Assuming that you wish for us listers to >query any possible typos in your documents >or figures: In Z15k2 grounding for >Seaplane, is the diode between the Main Bus >and Endurance Bus shown in a reversed orientation? >Gordon Smith No need to assume anything my friend. It's an earnest and respectful request that folks help us evolve data offered on aeroelectric.com into the best we know how to do. Yes, you're correct, the diode is reversed in that drawing. I'll fix it ASAP. Thanks! Bob . . . --------------------------------------- ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------


    Message 4


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    Time: 09:26:06 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Control Stick Switches =?iso-8859-1?Q?=93?= Best
    Practice? At 09:18 AM 10/11/2009, you wrote: <gordonrsmith921@yahoo.com> Given: RV A/C with airframe tied directly to battery ground (rear Batteries). I am planning the following switch functions on the control stick: Trim (4 way), Com PTT, Autopilot Control, and perhaps Com channel flip-flop and other functions. All of these functions require a momentary pull to low (ground) to activate/toggle a function. My original planning was to employ a single ground conductor up the stick to the switches. This ground conductor would be tied, locally, to A/C ground in the area of the stick. After reviewing various Z figures it appears that a better practice would be to bring the stick ground conductor to the Panel G3 (inside firewall) or the Avx G5 (back side of panel). Which is preferred? There's no "golden" recipe for success here. You need to establish design goals (make a control stick with lots of buttons control lots of things by pulling a control line to ground). Then do a failure mode effects analysis for the ways that the control system might fail. Is it proper to have a single ground conductor for all of the stick switch functions? Should the PTT be given special consideration and a separate ground path with perhaps both (to-from) paths shielded. It's not a mater of "proper", it's a matter of criticality for any single and then a combination of items in the control system to be lost. If that single ground breaks, what is the likely outcome of your flight? Do you need to craft a specific plan-b for any of those failures? PS Engineering schematics show PTT wiring only from the mic jack (PTT from the tip and low-ground from the barrel). Can the remote stick PTT be wired directly from the Intercom, connecting to the respective PTT mic pin and mic low connection at the Intercom? Should these conductors be shielded in this case? A twisted pair would be nice but shielding is not necessary or beneficial. Perhaps the bottom line might be: 1. 1 ground conductor for trim relay decks going to local ground. 2. 1 ground conductor for PTT going to Intercom or mic jack. 3. 1 ground conductor for the other toggle functions to Avx G5. Overkill? Can't answer that for you. If any failure deprived you of any one or all of those features, how would you deal with it? If subsequent arrival with the earth is comfortable and sweat-free, then a single ground would be fine. If not, then modify your planning accordingly. Bob . . . --------------------------------------- ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------


    Message 5


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    Time: 03:20:31 PM PST US
    From: "Mick Muller" <mmul6471@bigpond.net.au>
    Subject: B & C Alternator cooling
    Howdy All, I recently bought a B & C alternator for my RV and am installing it to replace the ole internally regulated automotive one. The old Auto type alternator required some fancy cooling work to bring blast air into the face of the unit. Of course no part of the existing set up will work with the B & C unit. To anyone who has fitted on or knows anything about them, do you also have to cool the B & CF unit?? I was hoping that with its internal cooling fan going the right way, it would not need fancy cooling shrouds etc. I posted a question to B & C but have had no response from them as yet. Mick


    Message 6


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    Time: 05:55:19 PM PST US
    From: "J. Mcculley" <mcculleyja@starpower.net>
    Subject: Re: B & C Alternator cooling
    Which B&C unit are you installing----the SD-8 or SD-20? The SD-8 is driven off the vacuum pump pad at the top right rear of Lycomings accessory case and I think the SD-20 is also mounted there. They are both PM units with external regulators provided. The SD-8 is happy without any external cooling air provision. Don't "think" that is any different for the SD-20. Jim McCulley =================================================================================== Mick Muller wrote: > <mmul6471@bigpond.net.au> > > Howdy All, > I recently bought a B & C alternator for my RV and am installing it to > replace the ole internally regulated automotive one. The old Auto type > alternator > required some fancy cooling work to bring blast air into the face of the > unit. Of course no part of the existing set up will work with the B & C > unit. > To anyone who has fitted on or knows anything about them, do you also > have to cool the B & CF unit?? > I was hoping that with its internal cooling fan going the right way, it > would not > need fancy cooling shrouds etc. I posted a question to B & C but have > had no response from them as yet. > Mick > > > > >


    Message 7


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    Time: 06:18:37 PM PST US
    Subject: AEC Modules
    From: "gordonrsmith921@yahoo.com" <gordonrsmith921@yahoo.com>
    lectric Bob: When you get to the point of building and selling your AEC 9024 module, will you also be building and selling your AEC 9011 module? Gordon Smith Read this topic online here: http://forums.matronics.com/viewtopic.php?p=267523#267523


    Message 8


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    Time: 07:00:08 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: AEC Modules
    At 08:17 PM 10/11/2009, you wrote: >"gordonrsmith921@yahoo.com" <gordonrsmith921@yahoo.com> > >lectric Bob: >When you get to the point of building and >selling your AEC 9024 module, will you also be >building and selling your AEC 9011 module? yes, all the "under development" products will hit the catalog within a period of about 4-6 weeks. I'm still semi-paralyzed in with the electronics shop facilities. Our move to Medicine Lodge has been fraught with potholes! Bob . . . --------------------------------------- ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------


    Message 9


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    Time: 08:21:09 PM PST US
    Subject: Re: B & C Alternator cooling
    From: peter laurence <peterlaurence6@gmail.com>
    Mick, Running one on a Velocity for 4 plus years sans cooling fan. No problems. Peter On Sun, Oct 11, 2009 at 6:16 PM, Mick Muller <mmul6471@bigpond.net.au>wrote: > mmul6471@bigpond.net.au> > > Howdy All, > I recently bought a B & C alternator for my RV and am installing it to > replace the ole internally regulated automotive one. The old Auto type > alternator > required some fancy cooling work to bring blast air into the face of the > unit. Of course no part of the existing set up will work with the B & C > unit. > To anyone who has fitted on or knows anything about them, do you also have > to cool the B & CF unit?? > I was hoping that with its internal cooling fan going the right way, it > would not > need fancy cooling shrouds etc. I posted a question to B & C but have had > no response from them as yet. > Mick > >




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