---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 08/09/21: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:04 AM - Re: Some Thoughts on Z101 (wsimpso1) 2. 07:28 AM - Re: Z101 has been released under Rev A (wsimpso1) 3. 07:29 AM - Re: Z101 has been released under Rev A (wsimpso1) 4. 06:39 PM - Re: Re: Z101 has been released under Rev A (Charlie England) ________________________________ Message 1 _____________________________________ Time: 07:04:46 AM PST US Subject: AeroElectric-List: Re: Some Thoughts on Z101 From: "wsimpso1" Hmm, I just read through this whole thread. The OP explained what he was thinking of doing based upon Z101, and asked if there were issues with his approach. What followed was questioning the OP on his motives, suggestions that the reboot might not be lengthy, and thread drift. No one responded to his query about his suggested mods to do this with less hardware and fuss. I too find his query to be interesting, and I am still interested in the pros and cons of his proposed mods. If anyone sees any issues the lesser experienced ones on this forum could benefit from, please address the original post. Billski Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502858#502858 ________________________________ Message 2 _____________________________________ Time: 07:28:57 AM PST US Subject: AeroElectric-List: Re: Z101 has been released under Rev A From: "wsimpso1" I was following along loosely on the Z101, but then a chapter colleague asked me to look in some detail at it and check a few things. We discovered the same issues... Depending upon variant, start sequence involves: 1 - Close Cl Del or Aux Bus switch; 2 - Program route, obtain clearance, etc; 3 - Close DC Master switch; 4 - Open Cl Del or Aux Bus switch; 5 - Start engine This allows us of the Cl Del/Brownout Bus continuously. It also appears to have a couple drawbacks. Please check us on this: If you open the Cl Del or Aux Bus switch before closing the DC Master switch, your route evaporates during start up. Sounds like a good reason to checklist this exact sequence and rehearse it a little... Once you are flying, something causes you to need to drop back to min electrical power in the airplane. This could be anything from alternator/regulator faults to an electrical fire. Your sequence to keep the EFIS, attitude reference, and #1 Com online (very important if IMC or smoke is obscuring view outside) must be to turn on the Cl Del or Aux Bus before turning off the DC Master. Do them out of order and your ability to keep the airplane upright and heading toward a safe spot to put down just evaporated until you get through the reboots and some scratching for the center freq. So, using this scheme seems to drive us to checklist this exact sequence too, and rehearse it a bunch. If I was more clever I suppose I could come up with a way to prevent inadvertent shut down of the Clearance/Brownout Bus. Anybody have any way to help out our very human pilot from these very human failures? Billski Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502859#502859 ________________________________ Message 3 _____________________________________ Time: 07:29:26 AM PST US Subject: AeroElectric-List: Re: Z101 has been released under Rev A From: "wsimpso1" I was following along loosely on the Z101, but then a chapter colleague asked me to look in some detail at it and check a few things. We discovered the same issues... Depending upon variant, start sequence involves: 1 - Close Cl Del or Aux Bus switch; 2 - Program route, obtain clearance, etc; 3 - Close DC Master switch; 4 - Open Cl Del or Aux Bus switch; 5 - Start engine This allows us of the Cl Del/Brownout Bus continuously. It also appears to have a couple drawbacks. Please check us on this: If you open the Cl Del or Aux Bus switch before closing the DC Master switch, your route evaporates during start up. Sounds like a good reason to checklist this exact sequence and rehearse it a little... Once you are flying, something causes you to need to drop back to min electrical power in the airplane. This could be anything from alternator/regulator faults to an electrical fire. Your sequence to keep the EFIS, attitude reference, and #1 Com online (very important if IMC or smoke is obscuring view outside) must be to turn on the Cl Del or Aux Bus before turning off the DC Master. Do them out of order and your ability to keep the airplane upright and heading toward a safe spot to put down just evaporated until you get through the reboots and some scratching for the center freq. So, using this scheme seems to drive us to checklist this exact sequence too, and rehearse it a bunch. If I was more clever I suppose I could come up with a way to prevent inadvertent shut down of the Clearance/Brownout Bus. Anybody have any way to help out our very human pilot from these very human failures? Billski Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502860#502860 ________________________________ Message 4 _____________________________________ Time: 06:39:18 PM PST US Subject: Re: AeroElectric-List: Re: Z101 has been released under Rev A From: Charlie England On 8/9/2021 9:28 AM, wsimpso1 wrote: > > I was following along loosely on the Z101, but then a chapter colleague asked me to look in some detail at it and check a few things. We discovered the same issues... > > Depending upon variant, start sequence involves: > 1 - Close Cl Del or Aux Bus switch; > 2 - Program route, obtain clearance, etc; > 3 - Close DC Master switch; > 4 - Open Cl Del or Aux Bus switch; > 5 - Start engine > > This allows us of the Cl Del/Brownout Bus continuously. It also appears to have a couple drawbacks. Please check us on this: > > If you open the Cl Del or Aux Bus switch before closing the DC Master switch, your route evaporates during start up. Sounds like a good reason to checklist this exact sequence and rehearse it a little... > > Once you are flying, something causes you to need to drop back to min electrical power in the airplane. This could be anything from alternator/regulator faults to an electrical fire. Your sequence to keep the EFIS, attitude reference, and #1 Com online (very important if IMC or smoke is obscuring view outside) must be to turn on the Cl Del or Aux Bus before turning off the DC Master. Do them out of order and your ability to keep the airplane upright and heading toward a safe spot to put down just evaporated until you get through the reboots and some scratching for the center freq. So, using this scheme seems to drive us to checklist this exact sequence too, and rehearse it a bunch. > > If I was more clever I suppose I could come up with a way to prevent inadvertent shut down of the Clearance/Brownout Bus. Anybody have any way to help out our very human pilot from these very human failures? > > Billski Hi Billski, I haven't followed Z101 development closely, since I'd already finished my architecture & wiring. But here's my take. IIRC, the dual alts are supposed to eliminate the need for load shedding. The Clrnc/BO bus is not an endurance bus. 'Smoke in the cockpit' traditionally means making the entire cockpit cold; not just the stuff we think we can do without in the moment (it could be the EFIS that's on fire). The engine bus staying hot is a required concession to an electrically dependent engine. My alternative to the brownout bus, relay, etc is to simply wire a boost converter's input to the EFIS's main power input, and it's output to one of the EFIS's diode-isolated aux power inputs. In my particular installation, it works fine to prevent brownout rebooting, and the parasitic load from the boost converter running all the time is a few tenths of an amp. I don't need the clearance delivery feature in my type of flying. Charlie (rv7charlie on HBA) -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.