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baggage area and CG

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dlm34077

Joined: 10 Feb 2007
Posts: 115
Location: AZ

Posted: Sat Jun 13, 2015 11:36 am Post subject: baggage area and CG

I have added a 680 on the firewall as aux battery for the avionics. This allows powering the avionics separately from the starting battery until the engine is running. Then the alternator recharges the starting battery and trickle charges the avionics battery on the firewall. The firewall battery is insulated and is used to improve W&B characteristics (engine is certified IO540 with Hartzell propeller). I once also had a tail down when my RF passenger hopped off the aircraft on the right aft step with two passengers still in the rear. I considered a tail hook for the rear but instead decided on a 5 inch steel ring tie down.  

   

David McNeill  

N46007 900+ TT   

      	 		 			 				 			 		 		 			

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Sat Jun 13, 2015 4:22 pm Post subject: Re: baggage area and CG

What do you have for your rear battery?

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Dave Ford
Cadillac, MI

Lenny Iszak

Joined: 23 Mar 2008
Posts: 270

Posted: Sat Jun 13, 2015 4:45 pm Post subject: Re: baggage area and CG

Temperatures on the firewall are not very friendly to the battery. I measured them using thermocouple probes and don't remember the exact numbers but it was in the 170-180s just before takeoff. Much less in flight. After shutdown it gets really toasty in there for a few minutes. I would check on that battery occasionally to make sure it still holds its rated capacity.

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Kelly McMullen

Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ

Posted: Sat Jun 13, 2015 8:41 pm Post subject: baggage area and CG

Who are  you asking? I think Dave has two PC680s, which seem to be perhaps slightly more popular than the single PC925L. I don't recall anyone using the plans recommended  RG25XC.

On Sat, Jun 13, 2015 at 5:22 PM, rvdave <rv610dave(at)gmail.com (rv610dave(at)gmail.com)> wrote:

[quote]--> RV10-List message posted by: "rvdave" <rv610dave(at)gmail.com (rv610dave(at)gmail.com)>

 

 What do you have for your rear battery?

 

 --------

 Dave Ford

 RV6 for sale

 RV10 building

 Cadillac, MI

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=443470#443470

 

 

 

 

 

 

 

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD

jesse(at)saintaviation.co
Guest

Posted: Sat Jun 13, 2015 9:22 pm Post subject: baggage area and CG

Many people are using the RG25XC. It's a good battery and fits stock. Seldom do I have a problem with them. 



Jesse Saint

Saint Aviation, Inc.

352-427-0285

jesse(at)saintaviation.com (jesse(at)saintaviation.com)

Sent from my iPad



On Jun 13, 2015, at 11:38 PM, Kelly McMullen <apilot2(at)gmail.com (apilot2(at)gmail.com)> wrote:

[quote]Who are  you asking? I think Dave has two PC680s, which seem to be perhaps slightly more popular than the single PC925L. I don't recall anyone using the plans recommended  RG25XC.

On Sat, Jun 13, 2015 at 5:22 PM, rvdave <rv610dave(at)gmail.com (rv610dave(at)gmail.com)> wrote:

 	  Quote: 	
		  --> RV10-List message posted by: "rvdave" <rv610dave(at)gmail.com (rv610dave(at)gmail.com)>

 

 What do you have for your rear battery?

 

 --------

 Dave Ford

 RV6 for sale

 RV10 building

 Cadillac, MI

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=443470#443470

 

 

 

 

 

 

 

 ===========

 -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List

 ===========

  FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

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[b]

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rvdave

Joined: 24 Jan 2009
Posts: 191

Posted: Sun Jun 14, 2015 3:04 pm Post subject: Re: baggage area and CG

 	  Quote: 	
		  I have added a 680 on the firewall as aux battery for the avionics. This allows powering the avionics separately from the starting battery until the engine is running. Then the alternator recharges the starting battery and trickle charges the avionics battery on the firewall. The firewall battery is insulated and is used to improve W&B characteristics 	




Just wondering if the starting battery is a 680 also, that's what I'm considering doing and wondered about its starting capacity in this configuration or do you have option for joining the two batteries?



...Also from PC680 info website-



The PC680MJT (MJ=Metal Jacket), means the battery is housed in a metal jacket. This enables the battery withstand higher ambient temperatures. The PC680MJ is rated to withstand temperatures of 176 degrees Fahrenheit vs. the standard PC680 is rated at 140 degrees Fahrenheit.



I will be adding a Y off the rear baffle to direct air on the firewall battery and air shutter while reducing hot air to tunnel area.  Although this won't help shutdown temps the metal jacket and other insulation should assist with that.

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_________________
Dave Ford
Cadillac, MI

EdKranz

Joined: 29 Dec 2010
Posts: 132
Location: Hastings, MN

Posted: Mon Jun 15, 2015 10:21 am Post subject: baggage area and CG

I agree with Lenny. I was planning on putting a battery on the FW, and after Lenny collected the temp data for me, I ended up mounting an EarthX battery in the stock location.



On Sat, Jun 13, 2015 at 7:45 PM, Lenny Iszak <lenard(at)rapiddecision.com (lenard(at)rapiddecision.com)> wrote:

[quote]--> RV10-List message posted by: "Lenny Iszak" <lenard(at)rapiddecision.com (lenard(at)rapiddecision.com)>

 

 Temperatures on the firewall are not very friendly to the battery. I measured them using thermocouple probes and don't remember the exact numbers but it was in the 170-180s just before takeoff. Much less in flight. After shutdown it gets really toasty in there for a few minutes. I would check on that battery occasionally to make sure it still holds its rated capacity.

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=443472#443472

 

 

 

 

 

 

 

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 -List" rel="noreferrer" target="_blank">http://www.matronics.com/Navigator?RV10-List

 ===========

  FORUMS -

 eferrer" target="_blank">http://forums.matronics.com

 ===========

 b Site -

           -Matt Dralle, List Admin.

 rel="noreferrer" target="_blank">http://www.matronics.com/contribution

 ===========

 

 

 

 [b]

- The Matronics RV10-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Ed Kranz
RV10
Finishing
www.edandcolleen.com

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