---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 03/18/22: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:26 AM - Re: Static Events On Composite Airplanes (Freedance) 2. 05:26 AM - Re: Battery capacity test (Freedance) 3. 05:26 AM - Re: Residue on negative battery pole (Freedance) 4. 05:27 AM - Re: Some Thoughts on Z101 (Freedance) 5. 09:26 AM - Re: Re: Battery capacity test (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 05:26:34 AM PST US Subject: AeroElectric-List: Re: Static Events On Composite Airplanes From: "Freedance" I have flown several different models of certified fiberglass aircraft IFR. These aircraft are designed and built with conductive mesh throughout the airframe to dissipate any static electricity build up. Despite this, on two different occasions I have had severe problems with static while IMC requiring a diversion. In one case it was so bad that the student was getting electric shocks through the yoke. The other incident took out half the avionics and magnetized the compass. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=506336#506336 ________________________________ Message 2 _____________________________________ Time: 05:26:38 AM PST US Subject: AeroElectric-List: Re: Battery capacity test From: "Freedance" The actual performance reduction of your battery, as a function temperature, could be tested by simply repeating your test after warming the battery to room temperature (which might take a few hours to warm). Something that would be interesting to know, if you have time. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=506337#506337 ________________________________ Message 3 _____________________________________ Time: 05:26:58 AM PST US Subject: AeroElectric-List: Re: Residue on negative battery pole From: "Freedance" One good check is to pour a bit of water saturated with some baking soda on it. If you get a good 'fizz' then there's products of electrolyte corrosion in the residue . . . otherwise it's something else. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=506338#506338 ________________________________ Message 4 _____________________________________ Time: 05:27:48 AM PST US Subject: AeroElectric-List: Re: Some Thoughts on Z101 From: "Freedance" The original goal was to craft a tinker-toy/leggo style architecture offering a variety of mix/match features. Each feature enjoyed two feed paths. The presence of no feature was dependent on configuration of other features (except for the brownout booster which goes away if its target bus is not installed Read this topic online here: http://forums.matronics.com/viewtopic.php?p=506339#506339 ________________________________ Message 5 _____________________________________ Time: 09:26:51 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Battery capacity test At 07:26 AM 3/18/2022, you wrote: > > >The actual performance reduction of your battery, as a function >temperature, could be tested by simply repeating your test after >warming the battery to room temperature (which might take a few >hours to warm). Something that would be interesting to know, if you have time. > > Agreed. There are numerous confounding conditions that affect measured capacity of a battery . . . including calibration of the measuring system. The capacity measurement techniques described in the 'Connection are COMPARATIVE studies that help an owner/operator make qualified decisions for replacement of the ship's battery. This means that every measurement taken must be conducted under the same conditions as subsequent measurements. Have battery sitting at room temperature for at least 24 hours with a maintainer attached. Then measure endurance under an identical load to compare against previous measurements. Contemporary wisdom suggests replacement at 80% of as-new capacity. Having said that, I'm assuming that 80% of as- new represents a battery that still meets your design goals for battery-only endurance. This speaks to a practice of sizing endurance loads and battery size such that an as-new battery EXCEEDS endurance requirements by 25% or more. CAPACITY speaks to battery only endurance; voltage at the end of a simulated cranking event speaks to getting the fan running up front. Two entirely separate considerations. Important considerations since a modern SLVA product incapable of running the electro- whizzies for the required time might still get the engine running. Of the two qualities, CAPACITY is the biggest, meanest bear in the woods. Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ------------------------------------------------------------------------------------- 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.