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  #11  
Old 01-13-2014, 09:08 AM
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ppilotmike ppilotmike is offline
 
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Quote:
Originally Posted by Tom Martin View Post
On the RV10 that I worked on a few years ago the owners mission was cross country flight with his family. With that in mind we moved the 680 battery from the aft position in the fuse to the forward face of the firewall. This move saved us a total of 17 lbs of weight and greatly reduced the wiring complexity.
A standard 680 metal box was used for the firewall.
What this meant was that when flying solo, in a worst case situation, the aircraft was placarded with a need for 50 lbs in the baggage compartment. Aside from the total reduction in empty weight it meant that more useful load could be carried, especially the important back seat and baggage load.
I have about 25 hours on the aircraft and it flew very nicely solo with the proper weight in the baggage area.
I do believe that this is an excellent modification for others to consider.
YMMV.
Perhaps one could do the same thing, only with a lighter LiPo battery. It would seem that this scenario wouldn't require as much ballast when flying solo...?
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  #12  
Old 01-13-2014, 03:36 PM
Wayne Gillispie Wayne Gillispie is offline
 
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Originally Posted by Flying again! View Post
I am going to replace the battery my -10 came with with a much lighter Shorai LFX36L3. Current battery (Odyssey 1200) is fine but limits me due to aft CG with 4 people and luggage. Example: currently with my family on board and 80 pounds of baggage I am the aft CG limit when I reach 30 pounds of fuel remaining.

Preliminary calculations show a 33.5 pound saving swapping out the battery! I measured from the rear seat to the battery and came up with an arm of 196.94 but do not know if this is correct.

Anyway, with weight savings and my estimated moment arm I have no aft CG issue. With my family and 100 pounds of luggage I can go to zero fuel remaining and still be within the CG range. With just me and full fuel my CG is at the forward CG but not an issue but I may swap batteries if I am only flying with 1 or 2 passengers and wanted the moment arm so I can account for the change.

I will weigh the -10 next month after the condition inspection since a couple of other things are being installed and I want a new measured W&B.

Thanks -- TJ
Let me know how that battery works out. I have a 925/680 in the back and run into similar loading issues.
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  #13  
Old 01-13-2014, 07:00 PM
jc11378 jc11378 is offline
 
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I am going to put the OD 925 In the back and a 680 up on the fwd firewall for a emergency back up battery. A lot cheaper then the TCW products and i can use itr if the 925 is dead for engine start.
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  #14  
Old 01-14-2014, 04:12 AM
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Quote:
Originally Posted by Wayne Gillispie View Post
Let me know how that battery works out. I have a 925/680 in the back and run into similar loading issues.
Wayne, I plan on installing it next month and will post the new and old CG and weight.

TJ
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  #15  
Old 01-14-2014, 01:00 PM
jimfaber jimfaber is offline
 
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Hi TJ,
FWIW, I just removed my Shorai LFX36L3 from my RV-10 and replaced with a PC680. The Shorai worked great for about 6 months then slowly starting losing the ability to crank the IO540. I was always have to cross tie to the 680 to start. I tried charging the Shorai but the charger cut out after only about 20 mins saying it was fully charged I gave up and installed a second 680.

Jim Faber
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  #16  
Old 01-14-2014, 03:08 PM
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Originally Posted by jimfaber View Post
Hi TJ,
FWIW, I just removed my Shorai LFX36L3 from my RV-10 and replaced with a PC680. The Shorai worked great for about 6 months then slowly starting losing the ability to crank the IO540. I was always have to cross tie to the 680 to start. I tried charging the Shorai but the charger cut out after only about 20 mins saying it was fully charged I gave up and installed a second 680.

Jim Faber
Hi Jim,

Sorry to hear that. The LFX batteries used by others in the -6, -7, and -8 have not reported the same problem. Did you use a trickle charger between flights?

I saw an LFX36 on Amazon for $262 but want it to work longer than 6 months for that type of money! Dual 680's only save 8 pounds over my 1200 and I don't think a single 680 would give the reserve I want.

Need to do more research.....
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  #17  
Old 01-14-2014, 07:00 PM
jimfaber jimfaber is offline
 
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Quote:
Originally Posted by Flying again! View Post
Hi Jim,

Sorry to hear that. The LFX batteries used by others in the -6, -7, and -8 have not reported the same problem. Did you use a trickle charger between flights?

I saw an LFX36 on Amazon for $262 but want it to work longer than 6 months for that type of money! Dual 680's only save 8 pounds over my 1200 and I don't think a single 680 would give the reserve I want.

Need to do more research.....
No I did not, however I flew almost 30 hrs on a long cross country trip for over a 7 day period. I would think that be enough to fully charge the battery. At the end of the trip, it would not crank the engine by itself.

My battery could be bad one. Hope you have better luck than I did.

Jim
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  #18  
Old 01-15-2014, 12:44 PM
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Space Cadet Space Cadet is offline
 
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Default I got 194"

I was running the numbers to move the battery forward of the firewall in my 10 same as someone else mentioned, and I figured a 194" arm, think I measured from the leading edge. Would definitely measure again to check before doing it though. FYI- I figured the CG change from moving the battery to be 2.5".

Dwight
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  #19  
Old 01-16-2014, 12:33 PM
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ppilotmike ppilotmike is offline
 
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Quote:
Originally Posted by Space Cadet View Post
I was running the numbers to move the battery forward of the firewall in my 10 same as someone else mentioned, and I figured a 194" arm, think I measured from the leading edge. Would definitely measure again to check before doing it though. FYI- I figured the CG change from moving the battery to be 2.5".

Dwight
Dwight,

Did you move your battery? If so, where did you mount it? Any weight savings in cable? I assume you did this to help offset the weight of the AC unit...? I hope you've been flying lately. We need to catch up. Call me sometime and we'll go hang out at Centennial.

Mike
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  #20  
Old 01-16-2014, 01:55 PM
humptybump humptybump is offline
 
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Quote:
Originally Posted by jimfaber View Post
I flew almost 30 hrs on a long cross country trip for over a 7 day period. I would think that be enough to fully charge the [Shorai] battery. At the end of the trip, it would not crank the engine by itself.
Jim etal,

It does sound like a bad battery or charging system as it is not normal from my experience.

As a counter point, I left my aircraft sitting in the hangar for 65 days, pulled it out and off for a 3 day 25 flight hour trip. Back in the hangar for 5 days. Then a 2-day 11 hour trip. Back in in the hangar for 22 days. Then a 5 hr day trip. No battery tender, trickle charger, etc.
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