---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 07/21/11: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:29 AM - Re: Load Analysis Spread Sheet (Mike Koehn) 2. 11:01 AM - Re: Re: Load Analysis Spread Sheet (Robert L. Nuckolls, III) 3. 03:12 PM - Airframe ground connection (Louie928) ________________________________ Message 1 _____________________________________ Time: 10:29:20 AM PST US Subject: AeroElectric-List: Re: Load Analysis Spread Sheet From: "Mike Koehn" What fun. Thanks to everyone who replied to this first post, especially Bob for his insight on how I aught to be thinking about the big picture. Z-13/8 seems like the right starting point. Great book. Found more spread sheet info in the archives as well so I am looking forward to a first pass at the (non?) problem. With an all electric airplane in mind and integral battery backups as part of the equipment design (skyView and D-10) there appears to be plenty of power redundancy for the airplane's meager mission and then some, at least on the back of the envelope. Fly safe, Mike -------- "Testing is what we do when we don't know what we are doing" Dr. Wernher von Braun Read this topic online here: http://forums.matronics.com/viewtopic.php?p=347326#347326 ________________________________ Message 2 _____________________________________ Time: 11:01:34 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Load Analysis Spread Sheet At 12:25 PM 7/21/2011, you wrote: > > . . . there appears to be plenty of power redundancy for the > airplane's meager mission and then some, at least on the back of the envelope. Good words to hear! Keep us in the loop so we can help you add your project to the fleet of the most efficient and affordable airplanes to have ever flown. You might just do a 'back of the envelope' dump to the List of all the electrical loads you presently anticipate in no particular order of importance. Just everything that spins, lights up, gets warm or makes noises . . . and blows fuses when having a bad day . . . Then let's 'shuffle the deck' here on the List . . . Bob . . . ________________________________ Message 3 _____________________________________ Time: 03:12:23 PM PST US Subject: AeroElectric-List: Airframe ground connection From: "Louie928" I'm building a Zenith 601XL. The airframe is constructed of mostly 0.025" 6061. The battery will likely be mounted behind the seat and the ground connection will be made to the nearby rear spar carry through which is 0.032" 6061 riveted to the floor and side skins. The firewall is 26 ga., 0.018", galvanized steel. I've seen the battery ground connection #4 AWG terminal bolted directly to the 0.032" sheet, and the engine connected to the firewall by a short #4 or braided copper. It seems to me that the current density at either of these connections is going to be quite high during engine start. Is it recommended to have a thicker metal section under the terminal at these connections? Something like 1/8" aluminum 2" or 3" in diameter riveted with, say 8 #4 rivets, to the underlying thin aluminum or galvanized steel to distribute the current? Is a couple of thick washers on each side of the sheet metal under the bolted through terminals enough? Or, run a +12V #4, and a ground #4, to the starter and engine thereby bypassing the airframe from the large starter current. The wire length from battery to engine is about 7 feet. -------- Louis W. Ott 601XL beginner Quick Build Read this topic online here: http://forums.matronics.com/viewtopic.php?p=347343#347343 ------------------------------------------------------------------------------------- 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.