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  #11  
Old 08-25-2017, 08:07 AM
WingedFrog's Avatar
WingedFrog WingedFrog is offline
 
Join Date: Mar 2010
Location: Raleigh, NC
Posts: 854
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Quote:
Originally Posted by RFSchaller View Post
I'm not familiar with the earthx battery. Is it a Li ion battery? How much weight does it save? How expensive is it? Is it a drop n replacement for the Concorde lead acid battery?

Rich
See this on earthx web site:
http://earthxbatteries.com/earthx-inc-proud-add-vans-aircraft-oems-using-earthx-lithium-battery-new-rotax-912is-equipped-rv-12is


FYI there are several models ranging from $129 to $725... and don't hold your breath about VANs choice!
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Builder's name: Jean-Pierre Bernoux
Sport Pilot
Kit # 120395 N124BX
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Builder's Blog:http://vieilleburette.blogspot.com/
EAA 1114

Last edited by WingedFrog : 08-25-2017 at 08:19 AM.
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  #12  
Old 08-25-2017, 09:33 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 6,992
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Quote:
Originally Posted by Jim T View Post
This part of Scott's post really caught my eye. As a builder of one of the old outdated RV-12 kits, I'll be anxious to see what the "Gen 2 kit for ULS installation" will consist of.

Jim
By Gen 2 kit I meant the updated RV-12iS kit. From this point on all new fuselage kit deliveries (once they begin in October) will be the new version fuselage, but builders will still be able to opt for using the ULS engine if they choose. Even if they use the ULS engine the standard kit will still include the Earthx battery.

The actual installation of the ULS engine will largely be the same as the iS... it will use the same cowl with the fwd mounted heat exchangers, etc.
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Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #13  
Old 08-25-2017, 02:39 PM
Jim T Jim T is offline
 
Join Date: Jan 2005
Location: Independence, OR
Posts: 169
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Quote:
Originally Posted by rvbuilder2002 View Post
By Gen 2 kit I meant the updated RV-12iS kit. From this point on all new fuselage kit deliveries (once they begin in October) will be the new version fuselage, but builders will still be able to opt for using the ULS engine if they choose. Even if they use the ULS engine the standard kit will still include the Earthx battery.

The actual installation of the ULS engine will largely be the same as the iS... it will use the same cowl with the fwd mounted heat exchangers, etc.
OK got it Scott. Makes sense. Thanks.

Jim
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2006 Rans S-6S Coyote (flying)
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  #14  
Old 08-26-2017, 08:53 PM
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engineerofsorts engineerofsorts is offline
 
Join Date: Mar 2009
Location: Austin, Texas
Posts: 293
Default EarthX battery on current RV-12

Having done a good "scratch and sniff" on the RV-12iS at Oshkosh, I came away very impressed with the refinements.
Also, having hefted the normal battery and an EarthX battery, I came away lusting after the potential weight savings if I could plunk one of those into my now-"classic" RV-12. Since the batteries are not physically identical (EarthX battery's terminals are in different positions than the 680) a bit of massage of the battery holder would be needed. However, CG-wise, the lighter battery forward of the CG seems like it it would have the effect of lessening the max luggage capacity aft of the CG. Ten cuss words if my analysis is correct.
Comments, Scott?
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RV-12 #332
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Austin, TX
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  #15  
Old 08-27-2017, 06:38 AM
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joedallas joedallas is offline
 
Join Date: May 2010
Location: Spring Hill Fl
Posts: 668
Default W&B

I don't think you can answer this question without knowing the optional equipment in the front of the CG and the weight of the pilot and copilot
Do a W&B to get your answer ( deduct the weight and arm difference from the old battery )

Also remember the arm of the baggage is somewhat under your control.

Note:
When the fore-aft center of gravity (CG) is out of range serious aircraft control problems occur. The fore-aft CG affects longitudinal stability of the aircraft, with the stability increasing as the CG moves forward, and stability decreasing as the CG moves aft. With a forward CG position, although the stability of the aircraft increases, the elevator control authority is reduced. This can cause a serious condition during the landing flare.

From

https://en.wikipedia.org/wiki/Center...of_an_aircraft

A good read

My View
Joe Dallas






Quote:
Originally Posted by engineerofsorts View Post
Having done a good "scratch and sniff" on the RV-12iS at Oshkosh, I came away very impressed with the refinements.
Also, having hefted the normal battery and an EarthX battery, I came away lusting after the potential weight savings if I could plunk one of those into my now-"classic" RV-12. Since the batteries are not physically identical (EarthX battery's terminals are in different positions than the 680) a bit of massage of the battery holder would be needed. However, CG-wise, the lighter battery forward of the CG seems like it it would have the effect of lessening the max luggage capacity aft of the CG. Ten cuss words if my analysis is correct.
Comments, Scott?
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Kit-#12400
www.joesrv12.com
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Last edited by joedallas : 08-27-2017 at 07:20 AM.
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