---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 11/15/24: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 11:50 AM - Please Make a Contribution to Support Your Lists... (Matt Dralle) 1. 06:18 AM - Re: Re: OVP relay in B+ lead bad idea (Finn Lassen) 2. 09:47 AM - Re: OVP relay in B+ lead bad idea (user9253) ________________________________ Message 0 _____________________________________ Time: 11:50:33 AM PST US From: Matt Dralle Subject: AeroElectric-List: Please Make a Contribution to Support Your Lists... Dear Listers, Just a reminder that November is the Annual List Fund Raiser. Please make a Contribution today to support the continued operation and upgrade of these great List services!! Also, pick up a really nice free gift with your qualifying Contribution too! The Contribution Site is fast and easy: https://matronics.com/contribution or by dropping a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 Thank you! Matt Dralle Matronics Email List Administrator RV-4/RV-6/RV-8 Builder/Rebuilder/Pilot ________________________________ Message 1 _____________________________________ Time: 06:18:41 AM PST US Subject: Re: AeroElectric-List: Re: OVP relay in B+ lead bad idea From: Finn Lassen Thank you Joe. Wish I'd seen or paid attention to that back in 2016! So an intermittently electrically open battery is definitely something to allow for in an electrically dependent engine installation. Certainly would explain the "noise" issues I was trying to solve. I unfortunately bought into the "battery is backup for alternator and alternator is backup for battery" idea. When you have intermittent failure or weaknesses in both, that just doesn't work. I still have to investigate the alternator. Is it really possible for its output voltage to drop low enough and long enough for a relay to open when RPM drops? Or was it a heat and/or vibration issue? RX-7 alternator re-man'd in 2002. I think I may even have replaced the internal voltage regulator in the process of troubleshooting noise, etc. Finn On 11/14/2024 10:26 PM, user9253 wrote: > > Yes, Bob performed an autopsy. > http://forum.matronics.com/viewtopic.php?p=460530 > . > http://www.aeroelectric.com/Pictures/Battery_Failures/PC680_12SEP2016/11_Inter-cellconnectorweldfailure.jpg > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=514522#514522 > > ________________________________ Message 2 _____________________________________ Time: 09:47:37 AM PST US Subject: AeroElectric-List: Re: OVP relay in B+ lead bad idea From: "user9253" It takes a lot less voltage and current to hold a relay closed than it does to first energize it. Just because a circuit breaker is marked "5A" doesn't necessarily mean that it will trip at exactly 5 amps. It should be bench tested with an adjustable current power supply. It might be tripping at much less than 5 amps. A loose connection will generate heat which can result in a breaker tripping at less than its rated current. The alternator field circuit breaker should not be tripping. - Good job making a forced landing and walking away. Many pilots panic when the engine quits and pull back on the stick to avoid going down. The wings stall with fatal results. The ground doesn't give. Bob Hoover quote: "If you're faced with a forced landing, fly the thing as far into the crash as possible." -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=514526#514526 ------------------------------------------------------------------------------------- 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.