---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 11/18/10: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:06 AM - Sources List () 2. 06:28 AM - Re: Recommend a digital multimeter? (Eric M. Jones) 3. 08:07 AM - Re: HiRose Circular Connectors (Robert L. Nuckolls, III) 4. 09:06 AM - Re: Re: Z-13/8 Rev. R (Robert L. Nuckolls, III) 5. 09:58 AM - Re: Z-13/8 Rev. R (Erich_Weaver@urscorp.com) 6. 12:31 PM - Re: Z-13/8 Rev. R (PaulR) 7. 10:32 PM - Z13/8 Rev Q comments (Jeff Page) ________________________________ Message 1 _____________________________________ Time: 05:06:13 AM PST US From: Subject: AeroElectric-List: Sources List 11/20/2010 Hello Bob, Per your request here is an additional link to add to the sources list: http://www.microfasteners.com/ These people have valuable fasteners for real airplanes as well (not just model airplanes) such as 100 degree countersink, flat head, six lobe (Torx) drive screws. Once you use a Torx drive screw on your airplane you will NEVER again use a phillips drive screw if it can be avoided. 'OC' Baker Says: "The best investment we can make is the time and effort to gather and understand knowledge." ===================================================== Time: 08:26:56 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Sources list . . . Just got an email from an AeroElectric-List reader reminding me of a Sources List we generated about a year ago that did indeed link to RTL Fasteners. I'll invite List members to review the list at http://aeroelectric.com/Sources.html and let me know if there's a useful link that needs to be added. Bob . . . ________________________________ Message 2 _____________________________________ Time: 06:28:01 AM PST US Subject: AeroElectric-List: Re: Recommend a digital multimeter? From: "Eric M. Jones" I have a pile of meters that await some golder moment when inspiration strikes me to fix them.....hah. I agree generally that cheapo meters will get the job done. My Galvanic frog-leg is still kicking when I apply the juice, but it is really nice to have dependable tools. After reading this list I went to Ebay and snapped up a like-new Fluke 77 for $38 including shipping. The seller had a note "Home Use Only!" on it, which scared away some potential buyers, but was only meant to indicate it had never seen industrial use. Last year when I had a very difficult 0.1% measurement, After considering all the alternatives, I bought a freshly calibrated Fluke 87V meter (on Ebay too!) that offered FOUR digits behind the decimal. Not cheap but 1/2 price on Ebay. The Fluke 11 was proof that not all Fluke meters are great, but Fluke seems to be the ticket for great products at a fair price. -------- 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=319914#319914 ________________________________ Message 3 _____________________________________ Time: 08:07:40 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: HiRose Circular Connectors These connectors are gone. Thanks to all who expressed an interest. If you really need to have a set of these connectors they may be acquired new-off-the-shelf at: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HR1741-ND http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=HR1743-ND Bob . . . ________________________________ Message 4 _____________________________________ Time: 09:06:41 AM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Re: Z-13/8 Rev. R Bob, Thanks for your work on this. Couple minor points and some questions. 1) Your drawing is for one Emag and one Pmag as shown in the lower right powered from different busses, but the battery bus on the left shows L and R ignitions powered from there. That's an artifact from an earlier cut-n-paste. Good catch. Fixed. 2) Again, at the battery bus, the 15amp fuse feeds a short 14AWG wire to the relay. The relay control wire to the switch is 22AWG, and again from same switch to ground. Shouldn't these wires also be 14AWG? No, these wires carry relay control current only which is perhaps 150 mA. This is not unlike the wire that controls the battery contactor too. 3) Shouldn't the fuselink feeding the E-bus be located at the feed end (next to the relay)?. No, that feedpath can be powered from BOTH ends hence protection at both ends. But you reminded me of another feature I wanted to fix. A faulted fuse at the e-bus end is much faster and less likely to damage the e-bus normal feedpath diode. I've revised to suggest fuse protection at that end as opposed to fusible link. 4) For some reason, I think the relay, load shunt, capacitor, crow bar components etc for the aux alt circuit should be located on the cockpit side of the firewall (possibly for a cleaner more cooler environment). Is this true? Not a big deal. Obviously it's cooler and cleaner in the cabin but at the same time, keeping all the high power wires out on the firewall is probably preferred. Further, the drawing shows the capacitor grounded at the firewall ground bus. Is there any problem grounding it at the avionics buss instead which is closer in my current layout? NO! That wire carries a lot of ripple current which is the byproduct of smoothing the SD-8 output . . . you don't want to inject that into the avionics ground. I think I'd keep all that alternator stuff on the forward side of the firewall. 5) You've got 5X20 AWG wires between the firewall ground and avionics ground busses. Is this intended to be on the same PIDG connector as shown or 5 separate connectors? 5 separate connectors at the firewall and 5 separate pins in the panel ground d-sub. If it's on the same connector, why not just use a heavier equivalent wire? Say 12AWG. Use a 12AWG if you want to solder the wire to your panel ground connector like shown here http://aeroelectric.com/Pictures/Grounding/Minibus1.jpg 6) Where can I buy a low voltage module? The one shown doesn't seem to be on the B and C website. That's one of my devices which will be the next product out the gate here. If you need it right now, Eric Jones has one. Bob . . . ________________________________ Message 5 _____________________________________ Time: 09:58:18 AM PST US Subject: AeroElectric-List: Re: Z-13/8 Rev. R From: Erich_Weaver@urscorp.com Minor comments to consider: My local experience is that most everyone building these days, even those on a budget, are installing engine monitors. Stand-alone low voltage monitors are not required. Similarly, alternator load meters and their associated shunts have been replaced by Hall effect sensors and the engine monitor. Maybe its time to modernize the schematic to reflect this? Just a thought... Erich ________________________________ Message 6 _____________________________________ Time: 12:31:00 PM PST US Subject: AeroElectric-List: Re: Z-13/8 Rev. R From: "PaulR" Bob, I was under the impression that EMAG Air had discontinued the "E" mag and was only making/selling the "P" mag. Just thinking that if you're revising it, maybe worthwhile to look into that also. -------- Paul Rose N417PR (res) RV-9A Read this topic online here: http://forums.matronics.com/viewtopic.php?p=319954#319954 ________________________________ Message 7 _____________________________________ Time: 10:32:56 PM PST US From: Jeff Page Subject: AeroElectric-List: Z13/8 Rev Q comments Bob, I wonder why the feed paths to the Endurance Bus are different. The relay from the battery bus is 14 awg and fused, while the diode from the main power bus is 16 awg and not fused. Previously, I was planning to use 14 awg and * 6 inches or less wire, without any fuses for both paths. I have changed my drawing so both paths include fuses. Since Z13/8 highlights some new technology with E-Mags, perhaps it makes sense to replace the Ford regulator with an electronic one that includes overvoltage protection and low voltage annunication ? Jeff Page Dream Aircraft Tundra #10 ------------------------------------------------------------------------------------- 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.