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Old Dec 11, 2012, 09:37 PM
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United States, NE, Lincoln
Joined Mar 2011
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I prefer wood props for the smaller engines, I really like my vess over falcon and xoar on my 50cc. On the big ones, 100cc+, I like carbon. I run a 32x8 mej on my da 150 and prefer it over the Vess 32c stealth.
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Old Dec 11, 2012, 09:54 PM
Team Aztech Aeromodels!
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United States, PA, Allentown
Joined May 2011
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Ok. The 23a sounds pretty good then.
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Old Dec 12, 2012, 10:06 AM
3DHobbyShop.com
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S. Lancaster County, PA
Joined Jun 2006
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3D Hobby Shop is having a sale on 12/12/12/... enter coupon code "12/12/12" at checkout for 12% off any in stock airframe. One day only of course, 12/12/12/.
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Old Dec 12, 2012, 11:13 AM
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United States, MO, Clayton
Joined Nov 2003
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Took apart one of my Fromeco 5200 packs to try and make 2 2600 packs out of it. While I was doing it, I looked up the cells and found that they are about $4-5 per cell, available locally. So for less than $20 in cells, these packs are selling for $70!!

Anybody else out there build their own lion or life packs?
One question I had was, I don't see balance connectors on the lion packs, are they needed?
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Old Dec 12, 2012, 11:27 AM
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United States, LA, Moss Bluff
Joined Nov 2008
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A local flyer who flys EDF's does a lot of lipo work. Jets are tight and he'll break them up to fit them or add a couple cells. I had a 4s 4000 zippy bust a cell and he took it made it a 3s and combined with another 4000 set. Good use out of usable stuff.
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Old Dec 12, 2012, 11:35 AM
Santi
DaaBears's Avatar
United States, MO, Clayton
Joined Nov 2003
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Quote:
Originally Posted by robj View Post
A local flyer who flys EDF's does a lot of lipo work. Jets are tight and he'll break them up to fit them or add a couple cells. I had a 4s 4000 zippy bust a cell and he took it made it a 3s and combined with another 4000 set. Good use out of usable stuff.
Looking for someone who's done work on Lithium ion, life, or a123's.. I won't mess with lipos, not yet anyways! ill stick with a more stable cell just in case I screw something up!
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Old Dec 12, 2012, 11:39 AM
Perfect 3pt inverted landing!
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USA, AL, Huntsville
Joined Oct 2008
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I've "built" 2S and 4S A123 packs before. Got my cells out of a Dewalt battery pack. It was not as easy as i thought it would be, but I wouldn't say it was difficult. The hardest part is soldering directly to the cells w/o getting them too hot.

Lots of tutorials and how-to's on the net if you search around. I followed some guides that were written years ago.
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Old Dec 12, 2012, 12:06 PM
Santi
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United States, MO, Clayton
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Do you know if lithium ion cells need ballance leads? The fromeco's don't have them, but the a123 tutorial I watched did.
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Old Dec 12, 2012, 01:10 PM
Perfect 3pt inverted landing!
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I'm not sure, to be honest. I thought that all lithium batteries benefit from balance charging.
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Old Dec 12, 2012, 01:13 PM
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USA, UT, St George
Joined Aug 2010
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Balancing is only needed if you want balanced packs
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Old Dec 12, 2012, 01:15 PM
Santi
DaaBears's Avatar
United States, MO, Clayton
Joined Nov 2003
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Quote:
Originally Posted by brathanke View Post
Balancing is only needed if you want balanced packs
So why does fromeco not have balance leads on their lithium ion packs, but they do on their life packs??
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Old Dec 12, 2012, 01:22 PM
220lb of Canned Heat, baby
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United States, IN, Derby
Joined Feb 2012
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Quote:
Originally Posted by UCDme3D View Post
So why does fromeco not have balance leads on their lithium ion packs, but they do on their life packs??
Could it be an internal circuit that balances them constantly? Ie, a "drain" that lets some voltage into the other cells when one is a little too full?
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Old Dec 12, 2012, 01:28 PM
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United States, MO, Clayton
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Quote:
Originally Posted by quadracer View Post
Could it be an internal circuit that balances them constantly? Ie, a "drain" that lets some voltage into the other cells when one is a little too full?
Could be... I took them apart and the cells were balanced perfectly at 4.01v each...
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Old Dec 12, 2012, 01:31 PM
3d NOOBular
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USA, UT, St George
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I don't know anything about their packs. Sorry.
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Old Dec 12, 2012, 03:22 PM
I fly, therefore, I crash!!!
SteveT.'s Avatar
San Jose, CA
Joined Jan 2008
27,665 Posts
Quote:
Originally Posted by brathanke View Post
Balancing is only needed if you want balanced packs
For lipos, it could also only be needed if you don't want to burn your garage/house down....

SteveT
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