---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 04/15/18: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:00 PM - z13 battery bus protection (mmcelrea) 2. 02:00 PM - Re: A bit of aviation history worth reviewing (speedy11@aol.com) 3. 03:41 PM - Re: z13 battery bus protection (Robert L. Nuckolls, III) 4. 04:00 PM - Re: z13 battery bus protection (Charlie England) 5. 04:01 PM - Re: Diy AOA, anyone ? (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 02:00:27 PM PST US Subject: AeroElectric-List: z13 battery bus protection From: "mmcelrea" Hi. On the Z13 design the wire from the contactor to the battery bus is recommended to be 6" or less. I don't want to put the battery bus on the fwf but on a panel with the other fuseblocks which will require a significantly longer wire. Is it acceptable or necessary to protect this wire with a fuse link and if so what size wire should I use? Max potential load will be about 15 amps. Does the main bus wire require similar protection? I'm using a 4.5ft length of 6awg for it. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=479345#479345 ________________________________ Message 2 _____________________________________ Time: 02:00:52 PM PST US From: speedy11@aol.com Subject: AeroElectric-List: Re: A bit of aviation history worth reviewing Bob, Thanks for that video link. It was very interesting. Stan Sutterfield Time: 11:30:21 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: A bit of aviation history worth reviewing https://youtu.be/F4KD5u-xkik Bob . . . ________________________________ Message 3 _____________________________________ Time: 03:41:27 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: z13 battery bus protection At 03:59 PM 4/15/2018, you wrote: > >Hi. >On the Z13 design the wire from the contactor to the battery bus is >recommended to be 6" or less. I don't want to put the battery bus on >the fwf but on a panel with the other fuseblocks which will require >a significantly longer wire. Is it acceptable or necessary to >protect this wire with a fuse link and if so what size wire should I >use? Max potential load will be about 15 amps. A battery bus is located proximal to the battery, else it's not a battery bus. Fuseblocks on the panel? Why? When would you EVER find value in fiddling with fuses or breakers in flight? Have you read . . . https://goo.gl/ytEfZJ https://goo.gl/utXVam https://goo.gl/L6VpN4 >Does the main bus wire require similar protection? I'm using a 4.5ft >length of 6awg for it. Study the z-figures . . . no such protection is required or recommended for crew controlled FAT wires . . . i.e. they go cold when the master is OFF. Bob . . . ________________________________ Message 4 _____________________________________ Time: 04:00:47 PM PST US Subject: Re: AeroElectric-List: z13 battery bus protection From: Charlie England On 4/15/2018 5:40 PM, Robert L. Nuckolls, III wrote: > At 03:59 PM 4/15/2018, you wrote: >> >> >> Hi. >> On the Z13 design the wire from the contactor to the battery bus is >> recommended to be 6" or less. I don't want to put the battery bus on >> the fwf but on a panel with the other fuseblocks which will require a >> significantly longer wire. Is it acceptable or necessary to protect >> this wire with a fuse link and if so what size wire should I use? Max >> potential load will be about 15 amps. > > A battery bus is located proximal to the battery, else > it's not a battery bus. Fuseblocks on the panel? Why? > When would you EVER find value in fiddling with fuses > or breakers in flight? Have you read . . . > > https://goo.gl/ytEfZJ > > https://goo.gl/utXVam > > https://goo.gl/L6VpN4 > >> Does the main bus wire require similar protection? I'm using a 4.5ft >> length of 6awg for it. > > Study the z-figures . . . no such protection is required > or recommended for crew controlled FAT wires . . . i.e. they > go cold when the master is OFF. > > > Bob . . . > Hi Bob, Not to speak for the OP, but.... Note that he says *a* panel; not *the* panel. I can see the wiring logic in a single firewall penetration wire and multiple feeds on the cold side of the firewall from that battery bus. Perhaps there's a disconnect (pardon the pun) in how each of you is defining a 'battery bus'. I can think of at least one bus I'd want to bypass my master contactor: the engine bus for an electrically dependent engine that's using automotive style fuel injection. I fed mine using a fusible link to feed an engine bus switch, which feeds the engine bus. (With a switched alternate feed from the main bus.) 15 amps is a safe number for fuel pump, controller, injectors, coils, etc. Charlie --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 5 _____________________________________ Time: 04:01:43 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Diy AOA, anyone ? At 08:52 AM 4/12/2018, you wrote: > >Hi all, > >One of my building buddies just challenged me concerning the >following Pitot angle of attack (AOA) device > >https://www.thingiverse.com/thing:1121786 > >Of course 3D printing the device is the easiest part. But does >anyone here happen to have implemented, programmed, etc. an AOA >indicator, and with what success ? > >BTW, some years ago I had the opportunity to make a study for such a >device based on differential pressure between upper and lower wing >surface. At the time the study involved a University wind tunnel, >hotwire profiles, several students, but nowadays my approach needs >to be much much "lower tech" as I no longer have access to such facilities. > >Thanks for your inputs, We had some discussions here on the List about various AOA sensor/display options about 15 years ago. During and since that time I'd collected some articles on the topic which I posted here https://goo.gl/5XdU1y One of the articles cloned a sensor mast that was popular with Piper as I recall. Don't recall the manufacturer off hand. Emacs! This probe was mounted under a wing on an inspection plate. Pretty easy to build. I recall that I offered to carve one out for a builder . . . but he never took me up on it. Something I've found quite useful before launching on any new development effort is to explore history of the practice. Patents are a useful place to lay foundations for refining the next generation . . . 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