AeroElectric-List Digest Archive

Sat 02/13/10


Total Messages Posted: 14



Today's Message Index:
----------------------
 
     1. 06:55 AM - Re: Mini blade fuses (Dan Brown)
     2. 08:27 AM - Basic Electricity....Grrrrr......... (Eric M. Jones)
     3. 09:52 AM - Re: Basic Electricity....Grrrrr......... (Robert L. Nuckolls, III)
     4. 10:22 AM - GPU for Piper (Chuck Jensen)
     5. 10:53 AM - Z-13 question (jonlaury)
     6. 11:30 AM - Re: GPU for Piper (Bruce Gray)
     7. 02:11 PM - Re: Z-13 question (B Tomm)
     8. 03:14 PM - Re: GPU for Piper (Chuck Jensen)
     9. 03:39 PM - Re: GPU for Piper (n801bh@netzero.com)
    10. 04:00 PM - Re: GPU for Piper (Chuck Jensen)
    11. 04:52 PM - Re: GPU for Piper (ROGER & JEAN CURTIS)
    12. 06:10 PM - Re: GPU for Piper (Allen Fulmer)
    13. 07:50 PM - Re: GPU for Piper (Robert L. Nuckolls, III)
    14. 10:03 PM - Re: Z-13 question (Bob McCallum)
 
 
 


Message 1


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    Time: 06:55:06 AM PST US
    From: Dan Brown <dan@familybrown.org>
    Subject: Re: Mini blade fuses
    On 2/12/10 9:13 PM, Robert L. Nuckolls, III wrote: > inventory I sold B&C some years ago. They appear on their > website at: > > http://www.bandc.biz/atctypefuse.aspx These are the ATC fuses, and I was actually looking for the ATM--but what I'm finding at Mouser and such for 1A ATM fuses requires a large order and a long lead time. ATC it is, then. Thanks!


    Message 2


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    Time: 08:27:55 AM PST US
    Subject: Basic Electricity....Grrrrr.........
    From: "Eric M. Jones" <emjones@charter.net>
    Perhaps the stars are misaligned, but I keep getting calls like this: "I bought your PowerSchottky Diode and it has voltage both ways. Don't you check this stuff before sending it out?..." "I bought your Powerlink Jr. III 35 amp relay and it won't turn (on or)off...the output still has voltage..." I could go on. I often forget that in the "basic electricity" world the existence of a voltage is presumed by many to mean something is ON. I need to include a "This means nothing at all" note in my instruction manuals. Solid state devices often use "pull-down" (or pull-up) resistors to prevent outputs from "floating". But this is done to prevent odd things from happening-- not usually to prevent voltmeters from reading something silly. Now this is not a unique characteristic of solid state devices. Any typical electromechanical relay will have some voltage on its power output lugs whether it is on or off, only the impedance will be different. A voltmeter with no load is pretty useless (but hey, it could be made to give nonsensical readings on those ghost-hunter shows). -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones@charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=286277#286277


    Message 3


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    Time: 09:52:13 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Basic Electricity....Grrrrr.........
    At 10:26 AM 2/13/2010, you wrote: Perhaps the stars are misaligned, but I keep getting calls like this: "I bought your PowerSchottky Diode and it has voltage both ways. Don't you check this stuff before sending it out?..." "I bought your Powerlink Jr. III 35 amp relay and it won't turn (on or)off...the output still has voltage..." I could go on. I often forget that in the "basic electricity" world the existence of a voltage is presumed by many to mean something is ON. I need to include a "This means nothing at all" note in my instruction manuals. Solid state devices often use "pull-down" (or pull-up) resistors to prevent outputs from "floating". But this is done to prevent odd things from happening-- not usually to prevent voltmeters from reading something silly. Now this is not a unique characteristic of solid state devices. Any typical electromechanical relay will have some voltage on its power output lugs whether it is on or off, only the impedance will be different. A voltmeter with no load is pretty useless (but hey, it could be made to give nonsensical readings on those ghost-hunter shows). May I suggest some words in your download/handout literature that speaks to errors of deduction that arise from errors of measurement? Some simple test procedures can stand off many unhappy returns from customers that do not understand the physics of our art. While multi-meters still had pointers moving over scale plates behind glass, there was no such thing as a VOLT METER. The meters were in fact sensors of current. They could be made to display voltage by placing a resistor in series with the instrument. E.g. a 0-1 milliampere meter movement might be placed in series with a 20K resistor and be fitted with a scale plate that reads from 0 to 20 volts. With a sensitivity of 1000 ohms/volt, this device would have yielded better data for your un-educated customers. During this same era, we had to go out of our way to craft voltmeters with VERY high sensitivities (Vacuum Tube Voltmeters) that would not load a voltage node driven by a particularly high impedance. Even with all the accuracy and non-loading effects of modern digital voltmeters at DC, they present a whole NEW problem when attempting the measure voltage at nodes where there are radio frequency components riding on the DC. The old VTVM had a resistor (1 to 10 megohms) built into the probe right at the tip. The modern digital meter expects to tell you what the voltage is a end ends of some long wire leads. I have adapted a 'scope probe to a 3/4" banana plug such that I can scale any of several digital meters by a factor of 10 while taking advantage of the very low capacitance/high resistance loads presented by the 'scope probe. Our customer base is the amateur airplane builder. By definition, they're NOT professionals in the broad spectrum of skill sets applicable to the task. Hence, the events you've cited should be expected on some level. I'm disappointed to report that the ranks of those who truly understand the physics of our art are getting pretty thin . . . even amongst professionals with credentials that suggest otherwise. The market we have is the market we have. We can choose to service it with what's necessary and useful to move the various projects ahead or . . . the alternatives are obvious. Bob . . .


    Message 4


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    Time: 10:22:42 AM PST US
    Subject: GPU for Piper
    From: "Chuck Jensen" <cjensen@dts9000.com>
    Does anyone know of an (relatively) inexpensive source for a ground power unit (GPU) that can be plugged into the wall that can be used for powering a plane's panel, such as a Piper Meridian or Malibu for doing armchair flying to sort through GPS controls, et al? Piper wants 2-3 thousand, which seems pricey, by not surprising. Surely there is a more man's substitute available? Chuck Jensen


    Message 5


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    Time: 10:53:36 AM PST US
    Subject: Z-13 question
    From: "jonlaury" <jonlaury@impulse.net>
    I have an all-electric airplane and am using Z-13 with a 40a stby alt. All mandatory engine power (EFI, IGN, etc) is on the battery bus As I understand Z-13, if the battery has a short , it takes down the battery bus, the redundant alternators notwithstanding, as there is no disconnect from the battery/batt bus. It seems that putting a DPST ON-ON switch between Batt Bus and Batt position & Alt 2 position would allow one to isolate a problematic battery and supply Alt 2 power to the Batt Bus and keeping the prop going round. I recognize that this defeats the bonehead-proof design of a hot battery bus, but adds an option should there be a battery problem. I'm not sure if it's a benefit or not. I would wire the two switch poles together to the batt buss, both sides of position one to the battery, both sides of position 2 to Alt 2. I think I'm buying some switch redundancy with a DPST. What do you all think? John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=286296#286296


    Message 6


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    Time: 11:30:36 AM PST US
    From: "Bruce Gray" <bgray@glasair.org>
    Subject: GPU for Piper
    A 28v/30a regulated power supply and a jumper cable should be all that is needed. My PS is manufactured by Astron. (VLS 35M, about $400) http://www.astroncorp.com/showpage.asp?p=6 Bruce www.Glasair.org -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Chuck Jensen Sent: Saturday, February 13, 2010 1:15 PM Subject: AeroElectric-List: GPU for Piper <cjensen@dts9000.com> Does anyone know of an (relatively) inexpensive source for a ground power unit (GPU) that can be plugged into the wall that can be used for powering a plane's panel, such as a Piper Meridian or Malibu for doing armchair flying to sort through GPS controls, et al? Piper wants 2-3 thousand, which seems pricey, by not surprising. Surely there is a more man's substitute available? Chuck Jensen


    Message 7


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    Time: 02:11:45 PM PST US
    From: "B Tomm" <fvalarm@rapidnet.net>
    Subject: Z-13 question
    John, I don't think it's a good idea. I don't believe that a "short" is a failure mode for a battery that you should be concerned with because it is too rare especially on a well maintained battery. Perhaps you meant a single shorted cell, while also rare but if it did happen, would still produce enough current at an acceptable voltage to run EFI, or so I believe. Adding switches or relays to add control of the battery bus obviously adds failure points which I think would be orders of magnitude more likely than a "shorted" battery. If your main alternator (electrical energy generator) fails, the battery (electrical energy reservoir) is a short term back up and should be sized to power your essential loads longer than your total onboard fuel supply. You have a second alternator, so that is your indefinite backup (in my opinion). If your battery is always maintained and replaced regularly, I don't think you will ever go without sufficient electrons at-the-ready. My opinions only. Others may disagree. Bevan -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of jonlaury Sent: Saturday, February 13, 2010 10:51 AM Subject: AeroElectric-List: Z-13 question --> <jonlaury@impulse.net> I have an all-electric airplane and am using Z-13 with a 40a stby alt. All mandatory engine power (EFI, IGN, etc) is on the battery bus As I understand Z-13, if the battery has a short , it takes down the battery bus, the redundant alternators notwithstanding, as there is no disconnect from the battery/batt bus. It seems that putting a DPST ON-ON switch between Batt Bus and Batt position & Alt 2 position would allow one to isolate a problematic battery and supply Alt 2 power to the Batt Bus and keeping the prop going round. I recognize that this defeats the bonehead-proof design of a hot battery bus, but adds an option should there be a battery problem. I'm not sure if it's a benefit or not. I would wire the two switch poles together to the batt buss, both sides of position one to the battery, both sides of position 2 to Alt 2. I think I'm buying some switch redundancy with a DPST. What do you all think? John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=286296#286296


    Message 8


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    Time: 03:14:28 PM PST US
    Subject: GPU for Piper
    From: "Chuck Jensen" <cjensen@dts9000.com>
    Thanks, Bruce...but then, I suppose one has to hook that up to the Piper plug, which is only overpriced by about double. Nonetheless, your link was a good one. Thanks, Chuck Jensen Diversified Technologies 2680 Westcott Blvd Knoxville, TN 37931 Phn: 865-539-9000 x100 Cell: 865-406-9001 Fax: 865-539-9001 cjensen@dts9000.com -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Bruce Gray Sent: Saturday, February 13, 2010 2:29 PM Subject: RE: AeroElectric-List: GPU for Piper A 28v/30a regulated power supply and a jumper cable should be all that is needed. My PS is manufactured by Astron. (VLS 35M, about $400) http://www.astroncorp.com/showpage.asp?p=6 Bruce www.Glasair.org -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Chuck Jensen Sent: Saturday, February 13, 2010 1:15 PM Subject: AeroElectric-List: GPU for Piper <cjensen@dts9000.com> Does anyone know of an (relatively) inexpensive source for a ground power unit (GPU) that can be plugged into the wall that can be used for powering a plane's panel, such as a Piper Meridian or Malibu for doing armchair flying to sort through GPS controls, et al? Piper wants 2-3 thousand, which seems pricey, by not surprising. Surely there is a more man's substitute available? Chuck Jensen


    Message 9


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    Time: 03:39:54 PM PST US
    From: "n801bh@netzero.com" <n801bh@NetZero.com>
    Subject: GPU for Piper
    Go to any auto parts store... Look for Cole Hersee part # 11042 plug With ground return terminal. Brass female contact with spring grip tension provides solid engagement with the mating socket. Cable clamp holds cable firmly in place. do not archive Ben Haas N801BH www.haaspowerair.com ---------- Original Message ---------- From: "Chuck Jensen" <cjensen@dts9000.com> Subject: RE: AeroElectric-List: GPU for Piper .com> Thanks, Bruce...but then, I suppose one has to hook that up to the Piper plug, which is only overpriced by about double. Nonetheless, your link was a good one. Thanks, Chuck Jensen Diversified Technologies 2680 Westcott Blvd Knoxville, TN 37931 Phn: 865-539-9000 x100 Cell: 865-406-9001 Fax: 865-539-9001 cjensen@dts9000.com -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Bruce Gray Sent: Saturday, February 13, 2010 2:29 PM Subject: RE: AeroElectric-List: GPU for Piper > A 28v/30a regulated power supply and a jumper cable should be all that is needed. My PS is manufactured by Astron. (VLS 35M, about $400) http://www.astroncorp.com/showpage.asp?p=6 Bruce www.Glasair.org -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Chuck Jensen Sent: Saturday, February 13, 2010 1:15 PM Subject: AeroElectric-List: GPU for Piper <cjensen@dts9000.com> Does anyone know of an (relatively) inexpensive source for a ground power unit (GPU) that can be plugged into the wall that can be used for powering a plane's panel, such as a Piper Meridian or Malibu for doing armchair flying to sort through GPS controls, et al? Piper wants 2-3 thousand, which seems pricey, by not surprising. Surely there is a more man's substitute available? Chuck Jensen ======================== =========== ======================== =========== ======================== =========== ======================== =========== ____________________________________________________________ Love Spell Click here to light up your life with a love spell! http://thirdpartyoffers.netzero.net/TGL2241/c?cp=BZFRgpccG3kVJsWTzIFa5 AAAJ1GgTD6yWnN9nTOcXhzb7nn5AAYAAAAAAAAAAAAAAAAAAADNAAAAAAAAAAAAAAAAAAAAR wAAAAA


    Message 10


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    Time: 04:00:03 PM PST US
    Subject: GPU for Piper
    From: "Chuck Jensen" <cjensen@dts9000.com>
    Thanks for the refresher, Ben, I recall of having seen that part number before and it may well suit my purposes. Chuck Jensen -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of n801bh@netzero.com Sent: Saturday, February 13, 2010 6:37 PM Subject: RE: AeroElectric-List: GPU for Piper Go to any auto parts store... Look for Cole Hersee part # 11042 plug With ground return terminal. Brass female contact with spring grip tension provides solid engagement with the mating socket. Cable clamp holds cable firmly in place. do not archive Ben Haas N801BH www.haaspowerair.com ---------- Original Message ---------- From: "Chuck Jensen" <cjensen@dts9000.com> Subject: RE: AeroElectric-List: GPU for Piper <cjensen@dts9000.com> Thanks, Bruce...but then, I suppose one has to hook that up to the Piper plug, which is only overpriced by about double. Nonetheless, your link was a good one. Thanks, Chuck Jensen Diversified Technologies 2680 Westcott Blvd Knoxville, TN 37931 Phn: 865-539-9000 x100 Cell: 865-406-9001 Fax: 865-539-9001 cjensen@dts9000.com -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Bruce Gray Sent: Saturday, February 13, 2010 2:29 PM Subject: RE: AeroElectric-List: GPU for Piper <bgray@glasair.org> A 28v/30a regulated power supply and a jumper cable should be all that is needed. My PS is manufactured by Astron. (VLS 35M, about $400) http://www.astroncorp.com/showpage.asp?p=6 Bruce www.Glasair.org -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Chuck Jensen Sent: Saturday, February 13, 2010 1:15 PM Subject: AeroElectric-List: GPU for Piper <cjensen@dts9000.com> Does anyone know of an (relatively) inexpensive source for a ground power unit (GPU) that can be plugged into the wall that can be used for powering a plane's panel, such as a Piper Meridian or Malibu for doing armchair flying to sort through GPS controls, et al? Piper wants 2-3 thousand, which seems pricey, by not surprising. Surely there is a more man's substitute available====================== ======================sp; -Ma======================== ================== ____________________________________________________________ Love Spell <http://thirdpartyoffers.netzero.net/TGL2242/c?cp=BZFRgpccG3kVJsWTzIFa5 AAAJ1GgTD6yWnN9nTOcXhzb7nn5AAYAAAAAAAAAAAAAAAAAAADNAAAAAAAAAAAAAAAAAAAARw AAAAA=> Click here to light up your life with a love spell!


    Message 11


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    Time: 04:52:06 PM PST US
    From: "ROGER & JEAN CURTIS" <mrspudandcompany@verizon.net>
    Subject: GPU for Piper
    ==> AeroElectric-List message posted by: "Chuck Jensen" <cjensen@dts9000.com> Does anyone know of an (relatively) inexpensive source for a ground power unit (GPU) that can be plugged into the wall that can be used for powering a plane's panel, such as a Piper Meridian or Malibu for doing armchair flying to sort through GPS controls, et al? Piper wants 2-3 thousand, which seems pricey, by not surprising. Surely there is a more man's substitute available Chuck, If I understand correctly, that you want to operate the electronics without the engine running. If this is the case, why not just connect a battery maintainer to your battery, plug it in, and it will keep your battery at full charge while running the electronics, provided you have a maintainer with enough capacity. I would assume you would not need more than about 10 amps, so it would not take a very large unit to accomplish this task. Roger


    Message 12


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    Time: 06:10:58 PM PST US
    From: "Allen Fulmer" <afulmer@charter.net>
    Subject: GPU for Piper
    Not sure if this is actually relevant to the original question but I bought the Cole Hersee Piper style socket and plug from Aircraft Spruce after reading Bob N's article on modifying for our OBAM aircraft. ACS catalog page: http://www.aircraftspruce.com/pdf/2010Individual/Cat10463.pdf AeroElectric connection article: http://www.aeroelectric.com/articles/grndpwr.pdf Socket and plug seemed kind of heavy to me? Socket was 10 oz. and plug was 7.2 oz. I guess I really might not have needed the plug as FBO is supposed to have this on his "battery cart?" Not sure if I am going to use it but it is not decision time yet. Allen Fulmer RV7 Finishing wiring From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of n801bh@netzero.com Sent: Saturday, February 13, 2010 5:37 PM Subject: RE: AeroElectric-List: GPU for Piper Go to any auto parts store... Look for Cole Hersee part # 11042 plug With ground return terminal. Brass female contact with spring grip tension provides solid engagement with the mating socket. Cable clamp holds cable firmly in place. do not archive Ben Haas N801BH www.haaspowerair.com ---------- Original Message ---------- From: "Chuck Jensen" <cjensen@dts9000.com> Subject: RE: AeroElectric-List: GPU for Piper <cjensen@dts9000.com> Thanks, Bruce...but then, I suppose one has to hook that up to the Piper plug, which is only overpriced by about double. Nonetheless, your link was a good one. Thanks, Chuck Jensen Diversified Technologies 2680 Westcott Blvd Knoxville, TN 37931 Phn: 865-539-9000 x100 Cell: 865-406-9001 Fax: 865-539-9001 cjensen@dts9000.com -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Bruce Gray Sent: Saturday, February 13, 2010 2:29 PM Subject: RE: AeroElectric-List: GPU for Piper A 28v/30a regulated power supply and a jumper cable should be all that is needed. My PS is manufactured by Astron. (VLS 35M, about $400) http://www.astroncorp.com/showpage.asp?p=6 Bruce www.Glasair.org -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Chuck Jensen Sent: Saturday, February 13, 2010 1:15 PM Subject: AeroElectric-List: GPU for Piper <cjensen@dts9000.com> Does anyone know of an (relatively) inexpensive source for a ground power unit (GPU) that can be plugged into the wall that can be used for powering a plane's panel, such as a Piper Meridian or Malibu for doing armchair flying to sort through GPS controls, et al? Piper wants 2-3 thousand, which seems pricey, by not surprising. Surely there is a more man's substitute available================================================================== =========================================================================== =sp; -Ma========================================== ____________________________________________________________ Love Spell <http://thirdpartyoffers.netzero.net/TGL2242/c?cp=BZFRgpccG3kVJsWTzIFa5AAAJ1 GgTD6yWnN9nTOcXhzb7nn5AAYAAAAAAAAAAAAAAAAAAADNAAAAAAAAAAAAAAAAAAAARwAAAAA=> Click here to light up your life with a love spell!


    Message 13


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    Time: 07:50:12 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: GPU for Piper
    At 08:08 PM 2/13/2010, you wrote: >Not sure if this is actually relevant to the original question but I >bought the Cole Hersee Piper style socket and plug from Aircraft >Spruce after reading Bob N's article on modifying for our OBAM aircraft. > >ACS catalog page: ><http://www.aircraftspruce.com/pdf/2010Individual/Cat10463.pdf>http://www.aircraftspruce.com/pdf/2010Individual/Cat10463.pdf > >AeroElectric connection article: ><http://www.aeroelectric.com/articles/grndpwr.pdf>http://www.aeroelectric.com/articles/grndpwr.pdf > >Socket and plug seemed kind of heavy to me? Socket was 10 oz. and >plug was 7.2 oz. I guess I really might not have needed the plug as >FBO is supposed to have this on his "battery cart?" Yup . . . that's the general rule. Actually, the "Piper" connector is a lighter, lower cost alternative to the AN2551 found on other brands and the heavier Piper aircraft. The C.H. 11041 and mating connector was originally created for the ground based vehicles market like OTR trucks and electric fork-lifts. I've used this connector on several 100+ AMP test systems for really BIG motors. To my knowledge, Piper was the only folk who used this connector on the lighter singles. I'm pretty sure all Brand C and Brand B airplanes used the AN2551. Any FBO worth his ground power revenues will have both. Bob . . .


    Message 14


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    Time: 10:03:39 PM PST US
    From: "Bob McCallum" <robert.mccallum2@sympatico.ca>
    Subject: Z-13 question
    John; See embedded comments. These are not intended in any way to be "smart assed" just trying to illustrate my personal opinion and understanding of the question. > -----Original Message----- > From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list- > server@matronics.com] On Behalf Of jonlaury > Sent: Saturday, February 13, 2010 1:51 PM > To: aeroelectric-list@matronics.com > Subject: AeroElectric-List: Z-13 question > > > I have an all-electric airplane and am using Z-13 with a 40a stby alt. All mandatory > engine power (EFI, IGN, etc) is on the battery bus > > As I understand Z-13, if the battery has a short(with a modern properly maintained AGM/VRLA battery this is about as likely as the engine mount falling off) , it takes down the battery bus, the > redundant alternators notwithstanding, as there is no disconnect from the > battery/batt bus. ( not quite true as the battery with a shorted cell (which doesn't happen) will likely still supply sufficient power to keep the engine running especially when supported by an operating alternator. If the alternator has sufficient reserve capacity it will "cook" the battery but all of this will take some time giving you ample opportunity to safely land) It seems that putting a DPST ON-ON switch between Batt Bus and > Batt position & Alt 2 position would allow one to isolate a problematic battery and > supply Alt 2 power to the Batt Bus and keeping the prop going round. (assuming your particular alternator will function without a battery, and you don't switch a load which stalls it) > > I recognize that this defeats the bonehead-proof design of a hot battery bus, but adds > an option should there be a battery problem. I'm not sure if it's a benefit or not. In my opinion it's not. > > I would wire the two switch poles together to the batt buss, both sides of position > one to the battery, both sides of position 2 to Alt 2. I think I'm buying some switch > redundancy with a DPST. (and when one pole of the switch fails ON how does the second pole help you turn it off??) > > What do you all think? I think it's a bad idea to play with a tried and true design which has had a lot of thought about failure modes put into it and try to second guess what "might" happen. Most of the "Z" figures represent electrical systems which are so superior to anything found in the average "production vehicle" (be it airborne or ground based) that your worries are unfounded. Batteries don't magically "fail", engines don't just fall off, prop bolts don't shear. All of these failures are so rare as to be ignored. That's not to say that batteries shouldn't be maintained and tested, engine mount integrity examined and prop bolts checked, but these failure possibilities don't warrant backups. (How would you propose to backup an engine mount for example? You just have to trust that it won't fail.) > > John > > Bob McC




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