---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 07/31/18: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:02 AM - Re: Re: Melted battery terminal (Robert L. Nuckolls, III) 2. 11:27 AM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page) 3. 05:23 PM - Re: Melted battery terminal (Eric M. Jones) ________________________________ Message 1 _____________________________________ Time: 09:02:50 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Melted battery terminal At 12:35 PM 7/30/2018, you wrote: > >It would be interesting to learn what the battery manufacturer has >to say about >the melted terminal. Would they put the blame on pilot error or >battery design >or poor connection or too small wire size or a combination of these? I suspect they would say, why was this battery being used to crank so large an engine? Unless a battery's sales literature speaks to 'cold cranking amps' or some such, it's reasonable to believe that hte battery was designed for more pedestrian pursuits. Waaayyy back when, there was an endeavor mounted by a start-up that called themselves Bolder Technologies out of Golden. CO. They started a next generation of the jelly-roll SVLA cell that featured very thin electrode sheets separated by equally compacted layers of active material. The cell was about the same size as a c-sized flashlight cell. It was rated at about 1.1 Ah but had an internal resistance of about 1 milliohm. Short circuit current on this product was over 1000 amps. Clearly, this was designed to support the extra ordinary demands of engine cranking. We saw some samples at B&C about 1999. There were a few products that exploited the cell's features. One was a 'start stick' that showed up at OSH a year or two. Show pilots were using them to crank up and then leave behind for the performance. But you only got ONE chance to get her lit up . . . The product had some problems. To achieve those delivery currents, they had to make 1000A capable electrical contact along the entire edge of an electrode sheet at both ends of the jelly roll. Not easy. I think there were issues with service life as well. The company went TU and was bought out by somebody in Malaysia I think. I'm seeing some new offerings in the 'start stick' class of product . . . costing $killo$. sure hope the performance issues are fixed! Then these new kids on the block may well be lithium based. https://goo.gl/yCJovM Wow, $250 for a power cord . . . a bit rich for my blood . . . Dug around a bit on Bolder TMF. Found some mentions all of which are 25 years old. https://goo.gl/G11GRS The TMF SVLA may well have been a flash in the fires of history . . . In any case, when a battery is INTENDED to perform in the low duty cycle high drain demands for engine starting, the engineering data sheets will speak to that capability with high draw time limits or other qualities like cold cranking amps. Many UPS/RV market batteries have been used successfully in light aircraft but will dance up to the edge of failure in hard- start events . . . Bob . . . ________________________________ Message 2 _____________________________________ Time: 11:27:08 AM PST US Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter From: "Eric Page" Update on the video multiplexer project: Alec developed and tested firmware for the multiplexer, then programmed the prototype board that I sent him. He then returned it to me and I finished the assembly by adding the switching IC. I then packaged it up with some ancillary parts and mailed it to Wade, so he can give it a test when he gets to that point in his build. More to follow once Wade reports on how the device works with his cameras. Once we have a solid solution, I'll forward all of the design files to Bob so that he can host them in his archive. Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481987#481987 ________________________________ Message 3 _____________________________________ Time: 05:23:04 PM PST US Subject: AeroElectric-List: Re: Melted battery terminal From: "Eric M. Jones" Tight connection are good to a point. After that, they can induce stress in the terminal...which was probably made of recycled crap anyway. Stress cracking, leading to failure. Only my guess. -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones(at)charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=481992#481992 ------------------------------------------------------------------------------------- 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.