---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Thu 01/03/13: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:18 AM - Re: wire size question (923TE) 2. 02:21 AM - Re: wire size question (923TE) ________________________________ Message 1 _____________________________________ Time: 02:18:05 AM PST US From: 923TE <923te@att.net> Subject: Re: TeamGrumman-List: wire size question ________________________________ Message 2 _____________________________________ Time: 02:21:17 AM PST US From: 923TE <923te@att.net> Subject: Re: TeamGrumman-List: wire size question Hi Gary, I didn't get a wiring diagram but Let's see: the weight of the batteries is RG-35A = 29.5-lbs RG-25 = 22.75-lbs (ref. 1) Difference = 6.5-lbs The weight of the wire is: M22759-2 2 AWG 0.275-lb/ft M22759-1 1 AWG 0.348-lb/ft Difference = 0.073-lb/ft M22759-02 2/0 AWG 0.542-lb/ft (ref. 2) Difference = 0.267-lb/ft As I recall you need minimum 9-ft, call it 10-ft So if using 2AWG instead of say double ought for 10-ft you save 2.67-lbs Not counting anything else, say like a lighter battery holder, there is only 9.17-lbs difference in using 2 AWG versus going way overboard and using 2/0 AWG So I figure his figures are way off.... Other than that, I'd be asking conditions. What compression ratio? Stock 8.7 :1? Or 10:1 like your plane? Does he have a high current draw starter? Does he have an electronic ignition system?Has he tried to start it this morning in the 30deg coldness of Auburn? Or last summer after refueling and hot sta rting in 112deg Lancaster afternoon? Think I'd leave the battery up front and replace it with this one that is 17 .75-lbs lighter. One that weighs only 5-lbs like here http://www.aerolithium.com/battery-sizing.html And use use this ultra light weight battery cables like this http://accel-ignition.com/universal-battery-cable-6686.html Attach to the starter with this http://www.jegs.com/i/JEGS-Performance-Products/555/10326/10002/-1 What do you,think? Regards, Ned 1) http://www.concordebattery.com/allaircraftbatteries.php 2) http://www.awcwire.com/ProductSpec.aspx?id=MIL-W-22759/2 On Jan 3, 2013, at 1:30 AM, Gary L Vogt wrote: Ned, What do you think of this? The plane this wiring diagram is for has an IO390 with a G-25 Concorde batte ry in the back. On 2awg wire he has no problems. He figured he saved 35 lbs o ver the heavier wire and the G-35 battery. Gary Sent from my iPad On Dec 19, 2012, at 8:32 PM, Gary Vogt wrote: > Thanks. That was perfect. > > From: 923TE <923te@att.net> > To: "teamgrumman-list@matronics.com" > Sent: Wednesday, December 19, 2012 12:40 PM > Subject: Re: TeamGrumman-List: wire size question > > Gary, > I remembered a discussion on this and found it in the archive here > http://grumman.net/archive/2003/msg06833.html > > Ned > > > On Dec 19, 2012, at 2:26 PM, Gary Vogt wrote: > > what size is the wire that goes from the alternator to the main buss > > > > > > > > ========================= ========= > ctric.com > >www.buildersbooks.com > uilthelp.com > matronics.com/contribution > ========================= ========= > t">http://www.matronics.com/Navigator?TeamGrumman-List > ========================= ========= > cs.com > ========================= ========= > ========================== ======== ========================== ======== ========================== ======== ========================== ======== ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message teamgrumman-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/TeamGrumman-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/teamgrumman-list Browse Digests http://www.matronics.com/digest/teamgrumman-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.