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02-07-2013, 11:10 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,574
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Really?
Quote:
Originally Posted by humptybump
Down the road, if you so choose, you can go with the even lighter LiFePO4 battery technology.
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You mean like the batteries in the B-787 Dreamliner?
Maybe down the road a ways.......
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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02-08-2013, 08:57 AM
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Join Date: May 2012
Location: Bowdoinham
Posts: 180
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Quote:
Originally Posted by Tom Schad
My RV-8 has an 0-360 and Hartzel Constant Speed. It has the battery in the back. When flying solo or with a light weight person in the back, I keep my tool bag, survival kit and CLAW etc. in the back. The RV-8 lands a lot easier, in my opinon, with the CG towards the rear instead of on the front limits, as it would solo with no weight in the back. Put it in the back!
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I agree with Tom. My -8 has an O-360 with a Whirlwind 200C prop and the lightweight Oddessy battery in the FRONT.
My empty weight is about 1,050 #, and flying solo it's a little nose heavy. No issues landing-wise, but pitch forces get a little heavy when doing acro.
Next time I'd put the battery in the back.
FWIW
__________________
Nick "Hairball" Knobil
RV8 N80549 (First Flight 2003)
Aerosport O-360A1A, Dual LS CDIs, WW200C
Bowdoinham, Maine
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02-08-2013, 10:44 AM
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Join Date: Dec 2005
Location: Ridgecrest, CA
Posts: 432
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Battery Location
-8A with Aerosport 180 HP IO-360, Hartzell CSP and AFS 4500/Garmin 496/TruTrak ADI2 and Oddessey (SP?) forward mounted battery. Empty weight 1122 lbs.
Have an in-limits forward CG that I counteract with 50 lbs of lead shot ballast in the aft baggage compartment. Decided to accept forward CG rather than run battery wires through the cockpit - and deal with aft-mounted access issues.
Agree that forward CG is harder to land. Have determined there is no way I can exceed aft CG limits - even with King Kong in the back. Wife won't fly so I'm mostly solo.
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02-27-2013, 08:56 PM
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Join Date: Dec 2004
Location: Southlake, Texas
Posts: 626
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Put it in the back
Us old heads that have been flying the RV-8 for over a decade have repeatedly told builders to put the battery in the back. Still builders continue to put them in the front and rationalize their choice. I can't see putting lead shot in the back to offset a nose heavy RV-8 that has the battery mounted on the firewall. Does it not stand to reason that if you are going to put lead in the tail to control the CG, that it should generate electrical power for you? What is in a battery that makes it so heavy? That's right...lead!
I met an RV-8A builder who told me he put 40 lbs of lead in the tail in-order to balance his RV-8A. I said, let me guess........you put the battery on the firewall right? Duh!
There is another active thread about 3 point landings vs wheel landings in the RV-8. Most guys say that the 8 will three point easier with a passenger in the rear. I wonder why? Could the RV-8 flown solo be nose heavy making it difficult to full stall? Just a thought!
Rear battery access is easy with the installation of a door over the battery in the rear shelf. I can pull the Doll's battery faster than if I had to remove the cowling to get to it. Another plus for a rear mounted battery is that they last years longer since they are not in the heat of the engine compartment. Just another thought!
__________________
Danny King
Beautiful Doll 80434 TT 1675 hours
I0360 A1B6 200 HP
Christen Inverted Oil
First Flight 12 July 2000
VAF Dues current for 2020
Last edited by Danny King : 03-03-2013 at 09:24 PM.
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02-28-2013, 04:04 PM
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Join Date: Jan 2011
Location: Camarillo, CA
Posts: 113
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battery
Danny, I met ya at Oshkosh last year and took a bunch of pictures of your 8. You were very helpful answering my questions, and yes my battery is in back thanks to you. Just wanted to say thanks for your time.
Mike McKelvey
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03-01-2013, 11:14 AM
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Join Date: Jan 2005
Location: Granbury Texas
Posts: 1,136
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Quote:
Originally Posted by Danny King
Us old heads that have been flying the RV-8 for over a decade have repeatedly told builders to put the battery in the back. Still builders continue to put them in the front and rationalize their choice. I can't see putting lead shot in the back to offset a nose heavy RV-8 that has the battery mounted on the firewall. Does it not stand to reason that if you are going to put lead in the tail to control the CG, that it should generate electrical power for you? What is in a battery that makes it so heavy? That's right...lead!
I met an RV-8A builder who told me he put 40 lbs of lead in the tail in-order to balance his RV-8A. I said, let me guess........you put the battery on the firewall right? Duh!
There is another active thread about 3 point landings vs wheel landings in the RV-8. Most guys say that the 8 will three points easier with a passenger in the rear. I wonder why? Could the RV-8 flown solo be nose heavy making it difficult to full stall? Just a thought!
Rear battery access is easy with the installation of a door over the battery in the rear shelf. I can pull the Doll's battery faster than if I had to remove the cowling to get to it. Another plus for a rear mounted battery is that they last years longer since they are not in the heat of the engine compartment. Just another thought!
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Could not have said it better Danny, I guess I am also one of those old heads who started flying the 8 over 10 years ago. I think I copied your rear shelf access door among other things and yes it is easier than the firewall.
Last edited by Pat Stewart : 03-01-2013 at 11:17 AM.
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03-02-2013, 08:33 AM
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Join Date: Jul 2007
Location: Keller, TX
Posts: 1,553
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As usual Danny has it right but from painful experience let me emphasize that you need to put a BIG access door back there to get to the battery and master contactor. Mine has a small door that allows me to get to a battery charging plug. Bad choice.
Pulling the rear baggage floor is a PITA.
__________________
RV-8 180 hp IO-360 N247TD with 10" SkyView!
VAF Donations Made 8/2019 and 12/2019
"Cum omni alio deficiente, ludere mortuis."
(When all else fails, play dead.)
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03-02-2013, 09:02 AM
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Join Date: Feb 2010
Location: GTA, Ontario
Posts: 826
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Fixed pitch?
Just wondering about the battery placement myself and I'll be going fixed pitch.
Will placing the battery in the rear with a fixed pitch setup be an issue?
Thanks
Don
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03-03-2013, 05:00 AM
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Join Date: Dec 2005
Location: Sweden, 67" North
Posts: 68
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Im building my RV light. No primer, basic instruments, lightweight starter/generator, electronic ignition, Catto 2 blade, O-360 ellison carb.. I have a small odyssey on the firewall. My plan is to have a small weight to bolt on to the tailwheel IF needed for aerobatics... 
__________________
Dennis Isaksson
G?llivare, Sweden
Grew up with an RV-4, SE-XIO
Now: RV-8, Showplanes Fastback. #83218 Under construction, SE-XXO
Engine and avionic installation in progress
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