AeroElectric-List Digest Archive

Tue 04/12/11


Total Messages Posted: 6



Today's Message Index:
----------------------
 
     1. 09:09 AM - Re: Which Diode part number to use for dual power feed? (Robert L. Nuckolls, III)
     2. 10:55 AM - Re: Which Diode part number to use for dual power feed? (plevyakh)
     3. 04:34 PM - Autocad on the web (JohnInReno)
     4. 06:10 PM - Re: Autocad on the web (Richard Tasker)
     5. 07:28 PM - Re: Autocad on the web (Robert L. Nuckolls, III)
     6. 07:49 PM - Re: coil tuning anyone? (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 09:09:04 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Which Diode part number to use for dual power
    feed? At 07:36 PM 4/11/2011, you wrote: > >If the EIS is to be your primary voltage monitor and low voltage >warning don't forget that it will read low by around 0.6 volts if >powered through a silicon diode. That said I think any 1N5400 series >(1N5401, 1N5402, etc.) would be sufficient as I think I only have a >2 or 3 amp fuse on my EIS4000. > >Further with the diodes you will not get a low voltage warning from >the main EIS voltmeter if the main supply fails. AUX inputs can be >used for that purpose though. > >Another approach is a two position power switch if you really want >it. I can see some comfort value in having a voltage reading if >operating an electric dependent engine after an alternator failure >but I did not consider it essential. Excellent points . . . Even when such multi-purpose instruments are operated from the e-bus, normal voltage readings would be at some level below real voltage readings. Which is not a particularly relevant fact. When architecture decisions are finalized, the effects to CALIBRATION can and should be considered. Your 'normal' voltage readings for standard ops might now be 13.5 volts as opposed to 14.2 . . . this is an entry into the POH, not a fact that calls for any agonizing over making tweaks to architecture or work- arounds (like substituting switches for diodes). If the EIS4000 is your only source for low voltage annunciation, then you might consider running the EIS from the main bus. If you loose the alternator in cruising flight and your plan-B calls for shutting down the main bus for ENDURANCE, I see no increase in risks for having the EIS be dark. Leave the engine settings alone and guess what? They'll be the same when you bring the main bus back up for approach to landing. This discussion highlights the reason way we changed the E-bus from "essential" to "endurance" some years back. Essential goodies are those necessary to get you back on the ground under present conditions. Way back when, if your Narco VT-1 Super-Homer went TU just before you intended to shoot a LOC approach, your plan-B called for an airport in VMC . . . unless you were really "uptown" with two VOR/LOC radios. The point is that critical equipment be (1) backed up with an independent substitute or (2) change of flight plans to work around criticality of that piece of equipment. Providing multiple power sources in an already failure tolerant architecture assumes that the highest risk of failure is loss of power. Lots of band-aid on top of band-aid while assuming that the system itself is impervious to all other failures. Bob . . .


    Message 2


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    Time: 10:55:09 AM PST US
    Subject: Re: Which Diode part number to use for dual power feed?
    From: "plevyakh" <hplevyak@mac.com>
    After considering your points I simplified and stayed with the Z10/8. My EIS4000 is on the Endurance bus along with my dual EFIS/AHRS. I'll flip the EBus Alternate feed on prior to engine start, eliminating the brown out potential, which will give the AHRS time to align prior to shaking the airplane around with engine start....and have my EIS on line to show oil pressure right after engine start. I've attached my latest architecture version. If anyone sees an error in wiring, please let me know. I'm learning tons here and greatly appreciate your inputs. Thank-you. Howard -------- Howard Plevyak GlaStar / North Bend, Ohio hplevyak@mac.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=336722#336722 Attachments: http://forums.matronics.com//files/printable_electric_glastar_w_dual_lightspeeds_architecture_v04_12apr2011_952.pdf http://forums.matronics.com//files/electric_glastar_w_dual_lightspeeds_architecture_v04_12apr2011_108.pdf


    Message 3


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    Time: 04:34:47 PM PST US
    Subject: Autocad on the web
    From: "JohnInReno" <john@morgensen.com>
    I just found this link for autocad that allows you to store and edit .dwg files: https://www.autocadws.com/ Can one of you knowledgeable cad folks take a look and see if it is worth it for casual use? It is a free service from AutoCad. -------- RV4 - Purchased flying RV-9A - soon Read this topic online here: http://forums.matronics.com/viewtopic.php?p=336756#336756


    Message 4


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    Time: 06:10:44 PM PST US
    From: Richard Tasker <retasker@optonline.net>
    Subject: Re: Autocad on the web
    I took a quick look at it. I use AutoCAD at work and this seems to be pretty much the same thing functionally. It runs in a browser using Flash and is not as responsive as the copy of AutoCAD on my desktop, but it does seem to work. I suppose it depends on your internet connection speed. It is certainly a whole lot cheaper than buying AutoCAD if you already know how to use AutoCAD. If you don't know AutoCAD, then I am not sure I would recommend this as opposed to buying or downloading one of the inexpensive (or free) CAD packages out there. If one is going to learn how to use a CAD package I would certainly want to have it on my desktop. If you need to do a quick drawing and know what you are doing, then this is certainly a quick solution. Dick Tasker JohnInReno wrote: > --> AeroElectric-List message posted by: "JohnInReno"<john@morgensen.com> > > I just found this link for autocad that allows you to store and edit .dwg files: > > https://www.autocadws.com/ > > Can one of you knowledgeable cad folks take a look and see if it is worth it for casual use? It is a free service from AutoCad. > > -------- > RV4 - Purchased flying > RV-9A - soon > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=336756#336756 > > >


    Message 5


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    Time: 07:28:48 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Autocad on the web
    > >If you need to do a quick drawing and know what you are doing, then >this is certainly a quick solution. > >Dick Tasker Agree on all points . . . I fiddled with it a bit and became quickly frustrated with the latencies associated with remotely accessed applications. We've go 3meg down/.7meg up connectivity here. For somebody starting out to learn a cad system, there are some much faster ways to go for $50 down to even free. TurboCAD opens, edits, prints and saves all the AutoCAD files on the 'Connection website. You can get where you want to go MUCH faster by modifying an existing drawing than starting from scratch. Bob . . .


    Message 6


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    Time: 07:49:46 PM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: coil tuning anyone?
    >If you have any suggestions on >what might make the following project work better, I'm all ears. >http://www.easytreasure.co.uk/bfo.htm I just reviewed this schematic again with some attention to the audio section . . . the thing has serious design flaws. We were focused on the oscillators and I didn't really do any kind of sanity check on the rest of it. The guy who designed this obviously had little knowledge of how to build stable, multi-stage amplifiers from transistors. You may be trying to build and troubleshoot a circuit that is crippled right out of the gate. Bob . . .




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