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1. 02:18 AM - Re: wire size question (923TE)
2. 02:21 AM - Re: wire size question (923TE)
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| Subject: | Re: wire size question |
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| Subject: | Re: 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
<image.jpeg>
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 <teamgrumman@yahoo.com> 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 <teamgrumman@yahoo.com> wrote:
> Thanks. That was perfect.
>
> From: 923TE <923te@att.net>
> To: "teamgrumman-list@matronics.com" <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 <teamgrumman@yahoo.com> wrote:
>
> what size is the wire that goes from the alternator to the main buss
>
>
>
>
>
>
>
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