---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 01/18/21: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:18 AM - Re: Engine Ground (Charlie England) 2. 07:11 AM - Re: Engine Ground (johnbright) 3. 07:15 AM - LR3-14 regulator, why for OEM alternators only (johnbright) 4. 07:43 AM - Re: Vertical Power VP-100 opinions ? (donjohnston) 5. 09:53 AM - Perihelion Design (speedy11@aol.com) 6. 10:53 AM - Re: Perihelion Design (johnbright) 7. 12:05 PM - Re: Perihelion Design (speedy11) 8. 01:02 PM - Wiring of the S704 in Z101 (prestonkavanagh) ________________________________ Message 1 _____________________________________ Time: 06:18:30 AM PST US From: Charlie England Subject: Re: AeroElectric-List: Engine Ground On Sun, Jan 17, 2021 at 4:17 PM bcone1381 wrote: > > In AEC book p. 5-3 instructs to install a fat ground wire from the battery > minus to the firewall ground stud, then a braided bonded jumper from the > ground stud to the crankcase.....additionally > > AEC P.5-4 suggest Grounding the Battery directly to the crankcase a wise > idea. > > Those are two different grounding methods > > Q 1. Is it suggesting to install two engine grounds for redundancy? > Q 2. I don't understand the use of a braided jumper cable, and wonder if > it s a poor practice to use 4AWG flexible welding cable for engine ground? > > -------- > Brooks Cone > Bearhawk Patrol Kit > If the battery is on the firewall, running the engine ground direct to the bat neg or to the firewall gnd is electrically the same (excepting the few micro-ohms in extra cable length). If the battery is in the aft fuselage, there'd be a *big* difference in weight to make two 'fat' runs. Some batteries make it fairly difficult to install more than one terminal on each post, so that can also drive decision making. A lot of guys install two engine grounds, for redundancy. Probably a waste of weight for a 'conventional' installation, but if the engine is electrically dependent (electronic injection or dual electronic ignitions), it might make sense. I had a car once that had cranking problems for years, and I finally discovered that the factory authorized dealership had left the engine ground strap unattached after maintenance on the car. Discovered it when I had the hood up, and a friend cranking the engine. Car had a cable-actuated clutch, and I saw the clutch cable start smoking while the starter was running. Braided ground is a bit more flexible than welding cable, but welding cable is flexible enough, and has the added advantage of minimizing abrasion risk, if other FWF items happen to come in contact with it (shouldn't happen, but....). Has the downside of the weight of the insulation, if you're counting ounces. A lot of us use welding cable for engine grounds. FWIW, Charlie ________________________________ Message 2 _____________________________________ Time: 07:11:04 AM PST US Subject: AeroElectric-List: Re: Engine Ground From: "johnbright" bcone1381 wrote: > ... Q 1. Is it suggesting to install two engine grounds for redundancy? Two engine grounds eliminates an SPOF for the alternator(s) and starter. If using dual grounds, preflight will not detect if one is broken so there needs to be periodic inspection. The EFI+I I know well is SDS. The EFI+I system does not use the engine as a ground path but of course losing the alternator(s) means you're operating on battery capacity. -------- John Bright, RV-6A, at FWF, O-360 Z-101 single batt dual alt SDS EM-5-F. john_s_bright@yahoo.com, Newport News, Va https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit?usp=sharing Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500313#500313 ________________________________ Message 3 _____________________________________ Time: 07:15:38 AM PST US Subject: AeroElectric-List: LR3-14 regulator, why for OEM alternators only From: "johnbright" I don't need to know but I'm curious. Why does the LR3-28 regulator work with "OEM 28v Alternators" but not with B&C alternators? -------- John Bright, RV-6A, at FWF, O-360 Z-101 single batt dual alt SDS EM-5-F. john_s_bright@yahoo.com, Newport News, Va https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit?usp=sharing Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500315#500315 ________________________________ Message 4 _____________________________________ Time: 07:43:13 AM PST US Subject: AeroElectric-List: Re: Vertical Power VP-100 opinions ? From: "donjohnston" I would advise against it. >From Vertical Power back in 2015. > Product obsolescence usually brings angst with both customers and their supplier. We at Astronics Ballard Technology had an unusual situation with the acquisition of the Vertical Power products. As many of you may know, we acquired only the VP-X Sport and the VP-X Pro products, plus bins and boxes of all kinds of parts. As a service to the community, we continued to provide repair support for already obsolete products such as the VP-50/VP-100/VP-200 whenever possible. However, we are now out of most the useable parts and many are no longer attainable. Therefore, we are discontinuing factory service support for these already obsoleted units. If you have one of these units and would like to upgrade to a VP-Pro, please contact Chad Jensen to discuss options. If you want an electronic power distribution system, I would suggest the VPX. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500316#500316 ________________________________ Message 5 _____________________________________ Time: 09:53:29 AM PST US From: speedy11@aol.com Subject: AeroElectric-List: Perihelion Design Does anyone know if Eric shut down his=C2-Perihelion=C2-Design web site ?I tried going to the site but could not connect.Stan SutterfieldDaytona Be ach ________________________________ Message 6 _____________________________________ Time: 10:53:17 AM PST US Subject: AeroElectric-List: Re: Perihelion Design From: "johnbright" works for me http://www.periheliondesign.com/ -------- John Bright, RV-6A, at FWF, O-360 Z-101 single batt dual alt SDS EM-5-F. john_s_bright@yahoo.com, Newport News, Va https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit?usp=sharing Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500320#500320 ________________________________ Message 7 _____________________________________ Time: 12:05:26 PM PST US Subject: AeroElectric-List: Re: Perihelion Design From: "speedy11" John - thanks for your reply. I must have misspelled the web site name. Stan Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500321#500321 ________________________________ Message 8 _____________________________________ Time: 01:02:03 PM PST US Subject: AeroElectric-List: Wiring of the S704 in Z101 From: "prestonkavanagh" Over the weekend I figured out a detail of the Z101 diagram - how to wire the S704 relay. See attached. In the Z101 detail Bob mirrors the expected flow through a relay. Normally power comes in the COM and goes out through either the NC or (when the coil is activated) the NO. Here power is sitting in the NO ready to flow to the device through the COM. It's elegant and creative. Or at least I found it so. -------- PBK3 PA-12, BD-4, RV6a, gliders Read this topic online here: http://forums.matronics.com/viewtopic.php?p=500322#500322 Attachments: http://forums.matronics.com//files/wiring_of_the_s704_1_relay_771.docx ------------------------------------------------------------------------------------- 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.