VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 07-19-2014, 06:26 PM
comfortcat's Avatar
comfortcat comfortcat is offline
 
Join Date: Jul 2005
Location: Southern California
Posts: 617
Default My new LiFePo battery...

I have the standard firewall mount from Van's for the PC680 but I want to use the new LiFePo Shorai LFX18L1-BS12 battery in my plane.

Many posts discuss the value of the swap, so I'll not discuss that here. Instead, I want to show how I got it to fit.

I bought a big hunk of styrofoam, and cut a piece 2 3/4 x 7 1/8 X 2 3/4 (These are approximate measurements, some trimmimg required). I placed the Shorai centered on top and drew a line around the base. Using a RotoZip tool, I cut an indentation 3/8" deep, Volia! Perfect fit and can use the same hold down.



And here is the best part! My hanger partner (who built a really nice RV-7) will make this my introductory lesson for fiberglassing! We will glass the block, and seal the foam from solvents.

__________________
--------------------------------------------------
David Boeshaar
RV-9A - N18TD (reserved) - Fuselage.
"My greatest fear: What if the hokey pokey really IS what its all about?"

TDAircraft.com
-July-
--------------------------------------------------
Reply With Quote
  #2  
Old 07-19-2014, 07:01 PM
deene deene is offline
 
Join Date: Jan 2005
Location: Georgetown, TX
Posts: 398
Default

Suggest that you trim a little (1/32") off all surfaces and then fiberglas the surfaces of your foam block. Spacer will last much longer.
__________________
Deene Ogden.
N399AD RV-12...flying
N299AD RV8 QB, IO-390X, BA prop...SOLD
N199AD One Design...SOLD
N99AD BD4, flew for 22 years...SOLD
EAA Tech Counselor/Flight Advisor
CFII, MEI, CFIG
Reply With Quote
  #3  
Old 07-19-2014, 07:35 PM
Arlen's Avatar
Arlen Arlen is offline
 
Join Date: Sep 2013
Location: New Smyrna Beach, FL
Posts: 305
Default

So.....in that thread that ran for about 3 years concerning LiFePo batteries, there was much discussion about charging these batteries.

I couldn't figure out if there was a consensus of opinion amongst the 247 posts in that thread.

Are these safe with our usual alternator charging systems? Can one use a trickle charger back in the hangar?

BTW, thanks for your great photos here.
__________________
Arlen
Donation to VAF 10.29.18
RV-6, February '14, SOLD December '15
Reply With Quote
  #4  
Old 07-19-2014, 08:41 PM
cubdriver cubdriver is offline
 
Join Date: Sep 2009
Location: San Diego
Posts: 144
Default Battery - Trickle Charger

My experience is that these batteries don't need a trickle charger. You can let them sit for a year and they will only lose 10% of their power.

Used one for a couple years with an O-235 with no issues.

__________________
Jim Potter - Ramona, CA
RV9A Owner- landed it at Osh on yellow dot
Previous Owner of 1940 J3 Cub
Currently Building RV14a
jim.potter@cox.net

Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return - Leonardo DaVinci

"There's a big difference between a pilot and an aviator. One is a technician, the other is an artist in love with flight." - Elrey B. Jeppesen
Reply With Quote
  #5  
Old 07-19-2014, 11:45 PM
comfortcat's Avatar
comfortcat comfortcat is offline
 
Join Date: Jul 2005
Location: Southern California
Posts: 617
Default Glassing the block...

Yup! That is what the lesson will all be about. I believe the styro will withstand the heat, but a fiberglass layer will make the entire block stronger.

Thanx!

CC

Quote:
Originally Posted by deene View Post
Suggest that you trim a little (1/32") off all surfaces and then fiberglas the surfaces of your foam block. Spacer will last much longer.
__________________
--------------------------------------------------
David Boeshaar
RV-9A - N18TD (reserved) - Fuselage.
"My greatest fear: What if the hokey pokey really IS what its all about?"

TDAircraft.com
-July-
--------------------------------------------------
Reply With Quote
  #6  
Old 07-20-2014, 07:26 AM
RV7Guy's Avatar
RV7Guy RV7Guy is offline
 
Join Date: Jan 2005
Location: Chandler, AZ
Posts: 2,940
Default Information has it....

That is a cool way to hold it. Be cautious of the foam degrading. You wouldn't want the battery to start settling.

Information has it that Shorai is going to have a drop in replacement for the 680. They will be at Oshkosh.

Regarding the charging, the charging protection circuit is in the battery. There is a balance port on the side that you use in addition to charging when not in the plane. I'm using a high end charger for my RC Lipo's and LiFe batteries to keep it charged till install.
__________________
Darwin N. Barrie
Chandler AZ
www.JDair.com
RV-7 N717EE-Flying (Sold)
RV-7 N717AZ Flying, in paint
EMS Bell 407,
Eurocopter 350 A-Star Driver
Reply With Quote
  #7  
Old 07-20-2014, 08:25 AM
GalinHdz's Avatar
GalinHdz GalinHdz is offline
 
Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,165
Default

GREAT idea. The next step is to make a mold, mass produce them and sell the fiberglass box as a conversion kit for this application.

Reply With Quote
  #8  
Old 07-20-2014, 10:10 AM
F1R F1R is offline
 
Join Date: Nov 2010
Location: ____
Posts: 861
Default

Great adapter block. Alternatively one could use a block of wood and drill it full of holes for weight reduction and air circulation.
Reply With Quote
  #9  
Old 07-20-2014, 11:53 AM
comfortcat's Avatar
comfortcat comfortcat is offline
 
Join Date: Jul 2005
Location: Southern California
Posts: 617
Default

Yup!

Thought about wood, but had the styrofoam in the hanger (and wanted the fiberglass lesson)

This guy also used UHMW plastic:

http://www.vansairforce.com/communit...eferrerid=1843


Quote:
Originally Posted by F1R View Post
Great adapter block. Alternatively one could use a block of wood and drill it full of holes for weight reduction and air circulation.
__________________
--------------------------------------------------
David Boeshaar
RV-9A - N18TD (reserved) - Fuselage.
"My greatest fear: What if the hokey pokey really IS what its all about?"

TDAircraft.com
-July-
--------------------------------------------------
Reply With Quote
  #10  
Old 07-20-2014, 01:15 PM
Mike S's Avatar
Mike S Mike S is online now
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,773
Default

It is not a hard thing to fiberglass this, but may I suggest that you radius the outer corners so the glass can form over it without lifting. The other way to do it if you really want square corners is to glass only one side of the corner, then cut and dig out the foam back at a 45* angle-----make it a quarter inch or so wide, and build up the corner with flox then add the glass on the other side.

I would make the inner well oversize and then use some foam rubber to hold the battery snugly in place, and at the same time give it a bit of vibration damping
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 03:19 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.