---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 07/12/14: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:16 AM - Re: Noisy USB Charger (Sacha) 2. 02:15 PM - Dual master solenoids (Tomhanaway) 3. 04:14 PM - Re: Dual master solenoids (Robert L. Nuckolls, III) 4. 10:54 PM - Re: Dual master solenoids (Bob Verwey) ________________________________ Message 1 _____________________________________ Time: 08:16:59 AM PST US From: "Sacha" Subject: RE: AeroElectric-List: Noisy USB Charger Hi Dennis, In the meantime, I took your advice and tried a different brand of charger. I bought it at Wal-Mart and I'm happy to report that it is working fine. It is black, comes in a bubble pack, and can plug into both a 120 VAC wall outlet and a 12 VDC cigar lighter outlet. It cost less than $20. It has two, 2.1 amp USB receptacles. Just for reference, can post a link to the item on Walmart.com? There are dozens of UBS chargers there. sacha ________________________________ Message 2 _____________________________________ Time: 02:15:24 PM PST US Subject: AeroElectric-List: Dual master solenoids From: Tomhanaway Working my way through Nuckoll's Z-13 wiring diagram. I'm building an 8-a VFR with single battery, single alternator. I'm not excited about the use of his "always hot" main bus because of the additional wire runs it would create from the buss mounted close to the rear mounted battery and difficulty accessing fuses for those wires. I'd like to run all electrical busses from the always hot side of the starter solenoid (always hot when master solenoid is hot). Given this scenario, it seems that the really significant system weakness is the failure of the master solenoid. I was thinking that a second master solenoid, with a separate wire and switch, wired in parallel at the battery, would address this issue. Does this make sense or am I missing something obvious (or not so obvious)? Thanks, Tom H. Sent from my iPad ________________________________ Message 3 _____________________________________ Time: 04:14:06 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Dual master solenoids At 04:14 PM 7/12/2014, you wrote: > >Working my way through Nuckoll's Z-13 wiring diagram. >I'm building an 8-a VFR with single battery, single alternator. > >I'm not excited about the use of his "always hot" main bus because >of the additional wire runs it would create from the buss mounted >close to the rear mounted battery and difficulty accessing fuses for >those wires. That's not a "MAIN BUS" . . . it's the MAIN BATTERY always-hot with exceedingly limited but often important tasks in getting power distributed to your airplane. GA airplanes have had always-hot busses since the clock and hour-meter fuses were mounted right next to the battery master contactor in the tail . . . in Cessnas I worked on in 1965. Study Z-13 again (or perhaps Z-11 which is a single alternator version). Also the notes for the z-figures along with the chapter on system reliability. >I'd like to run all electrical busses from the always hot side of >the starter solenoid (always hot when master solenoid is hot). Not sure what's driving this . . . The Z-figures are the culmination of over 45+ years experience in TC aviation enhanced by 25+ years in OBAM aviation exploiting the freedoms not enjoyed by TC aviation . . . to craft an architecture that meets YOUR mission requirements . . . not those of a bureaucracy most of whom do not build or fly airplanes. >Given this scenario, it seems that the really significant system >weakness is the failure of the master solenoid. I was thinking that >a second master solenoid, with a separate wire and switch, wired in >parallel at the battery, would address this issue. > >Does this make sense or am I missing something obvious (or not so obvious)? It's not clear that you understand the philosophy behind the various architectures and functionality of their several features. Suggest you PLAN for Z-13/8 by having all the WIRES in place to have a second alternator . . . unless you're going to have a vacuum pump, the consider NOT plugging a perfectly good source of mechanical energy with a cover plate. Print out copies of http://tinyurl.com/7jqypwj one for each bus. It generally takes three. List each load services by the various busses along with their magnitudes and flight configurations that the loads are expected/necessary. You may not need a battery bus . . . but get all your loads defined first . . . then decide what bus structures are needed. Do you plan any sort of electronic ignition. The RV8 is low wing so you no doubt have electric fuel pumps. Does any of your proposed electrics need memory keep-alive power? I single alternator, what's your goal for battery-only endurance? The load analysis study will let you set necessary battery size based on predicted loads. There's lot of sifting of requirements that will drive what gets powered from which busses. Go with Z-13/8 with second 4-pound alternator and your alternator-out endurance deliberations get a WHOLE LOT easier. Bob . . . ________________________________ Message 4 _____________________________________ Time: 10:54:37 PM PST US Subject: Re: AeroElectric-List: Dual master solenoids From: Bob Verwey TOM, Then you may as well have two of everything. Remember the cardinal rule..." build in simplicity and lightness" Bob Verwey On 12 Jul 2014 11:22 PM, "Tomhanaway" wrote: > > > > Working my way through Nuckoll's Z-13 wiring diagram. > I'm building an 8-a VFR with single battery, single alternator. > > I'm not excited about the use of his "always hot" main bus because of the > additional wire runs it would create from the buss mounted close to the > rear mounted battery and difficulty accessing fuses for those wires. > > I'd like to run all electrical busses from the always hot side of the > starter solenoid (always hot when master solenoid is hot). > > Given this scenario, it seems that the really significant system weakness > is the failure of the master solenoid. I was thinking that a second master > solenoid, with a separate wire and switch, wired in parallel at the > battery, would address this issue. > > Does this make sense or am I missing something obvious (or not so obvious)? > > Thanks, > Tom H. > > Sent from my iPad > > ------------------------------------------------------------------------------------- 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.